Appendix A: Key terms

NOTE: Except for the items marked * (which are from the Building Regulations 2010), these definitions apply only to Approved Document L, Volume 2: Buildings other than dwellings.

Air permeability The measure of airtightness of the building fabric. It is defined as the air leakage rate per hour per m2 of envelope area at the test reference pressure differential of 50Pa.

• The limiting air permeability is the worst allowable air permeability.

• The design air permeability is the target value set at the design stage.

• The assessed air permeability is the value used in establishing the building emission rate and the building primary energy rate. The assessed air permeability is based on a measurement of the air permeability of the building concerned.

Airtightness The resistance of the building envelope to infiltration when ventilators are closed. The greater the airtightness at a given pressure difference across the envelope, the lower the infiltration.

Building automation and control system A system comprising all products, software and engineering
services that can support energy efficient, economical and safe operation of heating, ventilation and air conditioning systems through automatic controls and by facilitating the manual management of those building systems.

Building control body A local authority building control department or an approved inspector.

Building emission rate The building’s CO2 emission rate expressed as kgCO2/(m2.year).

**Building envelope (in relation to a building)*Defined in regulation 35 as the walls, floor, roof,
windows, doors, roof windows and rooflights.

Building primary energy rate Expressed as kWhPE/(m2.year) and determined using the approved
methodology.

Centralised electrically heated A domestic hot water system in which the water is supplied to the draw-off points from a device in which water is heated by an electric element or elements immersed in the stored water. The water heater is situated centrally with a distribution system to supply water to the draw-off points and has a capacity greater than 300 litres.

Centre pane U-value The U-value determined in the central area of the glazing unit, making no allowance for edge spacers or the window frame.

**Change to energy status* Defined in regulation 2(1) as any change which results in a building becoming a building to which the energy efficiency requirements of these Regulations apply, where previously it was not.

CHPQA quality index An indicator of the energy efficiency and environmental performance of a CHP scheme, certified by the Combined Heat and Power Quality Assurance scheme.

Circuit-watt Refers to the power consumed in lighting circuits by lamps and, where applicable, their associated control gear (including transformers and drivers) and power factor correction equipment.

Coefficient of performance (COP) A measure of the efficiency of a heat pump at specified source and sink temperatures, measured using the procedures in BS EN 14511-2.

• Heating COP = heat output / power input

• % COP (COP 100) is the heat generator efficiency.

Commissioning When, after all or part of a fixed building service or on-site electricity generation system has been installed, replaced or altered, the system is taken from a state of static completion to working order. Testing and adjusting are carried out for fixed building services, as necessary, to ensure that the whole system uses no more fuel
and power than is reasonable in the circumstances.

For each system, commissioning includes all of the following.

• Setting to work.

• Regulation (that is, testing and adjusting repetitively) to achieve the specified performance.

• Calibration.

• Setting up and testing the associated automatic control systems.

• Recording the system settings and the performance test results that have been accepted as satisfactory.

Community heating system A system that supplies heat from a central source within a single building, for example to both dwellings and non-dwellings in a mixed-use building.

Consequential improvements Those energy efficiency improvements required by regulation 28.

Control zone Refers to the independent control of rooms or areas within buildings that need to be heated to different temperatures at different times.

Controlled service or fitting Defined in regulation 2(1) as a service or fitting in relation to which Part G [sanitation, hot water safety and water efficiency], H [drainage and waste disposal], J [combustion appliances and fuel storage systems], L [conservation of fuel and power] or P [electrical safety] of Schedule 1 imposes a requirement.

Direct-fired circulatorA domestic hot water system in which the water is supplied to the drawoff points from a hot water vessel in which water is heated by combustion gases from a primary energy source. The unit has no storage volume, as water is stored in a supplementary storage vessel.

Direct-fired continuous flow A domestic hot water system in which the water is supplied to the draw-off points from a device in which cold water is heated by combustion gases from a primary energy source as it flows through the water heater. The water heater is close to the draw-off points. The unit has no storage volume, as water is instantaneously heated as it flows through the device.

Direct-fired storage A domestic hot water system in which the water is supplied to the draw-off points from an integral hot water vessel in which water is heated by combustion gases from a primary energy source.

Display lighting Lighting to highlight displays of exhibits or merchandise, or lighting used in spaces for public leisure and entertainment, such as dance halls, auditoria, conference halls, restaurants and cinemas.

Display windowAn area of glazing, including glazed doors, to display products or services on offer to the public within a building, positioned as in all of the following.

• At the external perimeter of the building.

• At an access level.

• Immediately adjacent to a pedestrian thoroughfare.

If there is a permanent workspace within one glazing height of the window, this cannot be considered to be a display window. Glazing more than 3m above an access level should not be considered part of a display window, except where
either of the following applies.

• The products on display require a greater height of glazing.

• Building work involves changes to the façade and glazing that require planning consent, and planning requirements mean that a greater height of glazing is necessary, e.g. to fit with surrounding buildings or to match the character
of the existing façade.

District heat networks Supply heat from a central source to consumers, via a network of underground pipes carrying hot water. Heat networks can cover a large area or even an entire city, or can be relatively local, supplying a small cluster of buildings.

Dwelling A self-contained unit designed to accommodate a single household, including a dwellinghouse and a flat.
Economically feasible The capital cost of a measure will be recouped in energy savings within a reasonable time. For the purposes of this document, economically feasible means that the measure would achieve a simple payback after one of the following.

• 7 years, for the installation of thermostatic controls.

• 7 years, for the extension of on-site low and zero carbon energy-generating systems which are required as consequential improvements (see Appendix D, Table D1).

• 15 years, for any other measure.

Emergency escape lighting The emergency lighting that illuminates an area for the safety of people leaving that area or for people attempting to stop a dangerous process before leaving that area.

Energy efficiency ratio (EER) In chillers, this is calculated by dividing the cooling energy delivered into the cooling system by the energy input to the chiller.

**Energy efficiency requirements* Defined in regulation 2(1) as the requirements of regulations 23, 25A, 25B, 26, 26A, 26C, 28, 40 and 43 and Part L of Schedule 1.

Energy performance certificate Defined in the Energy Performance of Buildings (England and Wales) Regulation 2012 as a certificate which:

a. in the case of a certificate entered on the register before 9th January 2013 complied with the requirements of regulation 11(1) of the Energy Performance of Buildings (Certificates and Inspections) (England and Wales) Regulations 2007;

b. in the case of a certificate entered on the register on or after 9th January 2013 complies with the requirements of regulation 9(1) of these Regulations; or

c. complies with the requirements of regulation 29 of the Building Regulations 2010.

Envelope area (the measured part of the building) The total area of all floors, walls and ceilings bordering the internal volume that is the subject of a pressure test. This includes walls and floors below external ground level. Overall internal dimensions are used to calculate this envelope area, and no subtractions are made for the area of the junctions of internal walls, floors and ceilings with exterior walls, floors and ceilings.

Existing district heat network A district heat network that is either in operation or is under construction on 15 June 2022. For these purposes, under construction means any of the following.

• The building to house the energy centre has been constructed.

• There is a heat offtake agreement signed between the heat network and a third party.

• Excavation for pipework has been completed.

Fit-out workThe work to complete the partitioning and building services within the external fabric of the building (the shell) to meet the specific needs of incoming occupiers. Fit-out work can be carried out either:

• during the same project and time frame as the construction of the building shell

• at a later date, after the shell has been completed.

**Fixed building services* Defined in regulation 2(1) as any part of, or any controls associated with:

a. fixed internal or external lighting systems (but not including emergency escape lighting or specialist process lighting);

b. fixed systems for heating, hot water, air conditioning or mechanical ventilation; or

c. any combination of systems of the kinds referred to in paragraph (a) or (b).

Fixed external lighting Lighting fixed to an external surface of the building and supplied from the occupier’s electrical system. It excludes lighting in common areas of blocks of flats and in other communal accessways.

g-value A total solar energy transmittance.

Hard waterWater which has a high mineral content. For the purposes of this approved document, hard water is water that has a total water hardness of greater than 200ppm of CaCO3.

Heat generator seasonal efficiency The estimated seasonal heat output from the heat generator divided by the energy input.

Heating appliance or heat generator The part of a heating system that generates useful heat using one or more of the following processes.

• The combustion of fuels in, for example, a boiler.

• The Joule effect, taking place in the heating elements of an electric resistance heating system.

• Capturing heat from ambient air, ventilation exhaust air, or a water or ground heat source using a heat pump.

Heating zone A conditioned area of a building which is on a single floor and has the same thermal characteristics and temperature control requirements throughout.

High excitation purity light sources Colourtuneable light sources that can be set to at least the colours listed in Table A1 and which have for each of these colours, measured at the dominant wavelength, the minimum excitation purity shown. Intended for use in applications requiring highquality coloured light.

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Table A1 High excitation purity light sources

High-usage entrance door A door to an entrance primarily for people, through which many people are expected to move. Robustness and/ or powered operation are the main performance requirements. A high-usage entrance door will have automatic closers and, except where operational requirements preclude it, be protected by a lobby.

Indirect-fired circulator A domestic hot water system in which the water is supplied to the draw-off points from a device in which water is heated by an element through which the heating medium is circulated so as not to mix with the hot water supply. In practice, the heat source is likely to be a boiler dedicated to the supply of domestic hot water.

Installed capacity of a fixed building service per unit area The design output of the distribution system output devices (the terminal units) serving the space in question, divided by the total useful floor area of that space.

Instantaneous electrically heated A domestic hot water system in which the water is supplied to the draw-off points from a device in which cold water is heated by an electric element or elements as it flows through the water heater. The water heater is close to the draw-off points. The unit has no storage volume, as water is instantaneously heatedas it flows through the device.

Light source lumens The sum of the average initial (100 hour) lumen output of all the light sources in a luminaire. Does not include any losses or inefficiencies of the luminaire.

Lighting Energy Numeric Indicator (LENI) A measure of the performance of lighting in terms of energy per square metre per year (kWh/m2 per year). See Appendix B.

Local electrically heated A domestic hot water system in which the water is supplied to the drawoff points from a device in which water is heated by an electric element or elements immersed in the stored water. The water heater is near the draw-off points and has a storage capacity of between 100 and 300 litres.

Luminaire lumens Equal to (light source lumens light output ratio) and represents the output of the luminaire. Light output ratio (LOR) is the ratio of the output of the luminaire at stated practical conditions to that of the lamp(s) contained in the luminaire under reference conditions.

**Major renovation* Defined in regulation 35 as the renovation of a building where more than 25% of the surface area of the building envelope undergoes renovation.

**Material change of use* Defined in regulation 5 as: Where there is a change in the purposes for which or the circumstances in which a building is used, so that after that change:

a. the building is used as a dwelling, where previously it was not;

b. the building contains a flat, where previously it did not;

c. the building is used as an hotel or a boarding house, where previously it was not;

d. the building is used as an institution, where previously it was not;

e. the building is used as a public building, where previously it was not;

f. the building is not a building described in classes 1 to 6 in Schedule 2, where previously it was;

g. the building, which contains at least one dwelling, contains a greater or lesser number of dwellings than it did previously;

h. the building contains a room for residential purposes, where previously it did not;

i. the building, which contains at least one room for residential purposes, contains a greater or lesser number of such rooms than it did previously;

j. the building is used as a shop, where it previously was not; or

k. the building is a building described in regulation 7(4)(a), where previously it was not.

Modulating burner control A type of boiler control that provides a continuously variable firing rate that is altered to match the boiler load over the whole turndown ratio.

Optimum start A control system or algorithm that starts plant operating at the latest time possible to achieve specified conditions at the start of the occupancy period.

Optimum stop A control system or algorithm that stops plant operating at the earliest time possible so that internal conditions will not deteriorate beyond present limits by the end of the occupancy period.

Part load energy efficiency ratio A ratio calculated by dividing the cooling energy delivered into the cooling system by the energy input to the cooling plant. Part load performance for individual chillers is determined assuming that chilled water is provided at 7°C out and 12°C in (at 100% load), under the conditions detailed in Table A2.

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Table A2 Partial load efficiency ratio

Point-of-use electrically heated A domestic hot water system in which the water is supplied to the draw-off points from a device in which water is heated by an electric element or elements immersed in the stored water. The water heater is close to the draw-off points and has a storage capacity no greater than 100 litres.

Power efficiency The total annual power output of a CHP unit divided by its total annual fuel input. Primary energy Energy, from renewable and nonrenewable sources, that has not undergone any conversion or transformation process.

Principal works The work necessary to achieve the client’s purposes in extending the building and/or increasing the installed capacity of any fixed building services. The value of the principal works is the basis for determining a reasonable provision for some consequential improvements.

Renewable technology Technology that uses renewable resources, which are naturally replenished on a human timescale, to produce electricity. Resources include wind, wave, marine, hydro, biomass and solar.

Rooflight A glazed unit installed out of plane with the surface of the roof on a kerb or upstand. Also sometimes referred to as a skylight.

Roof window A window installed in the same orientation as, and in plane with, the surrounding roof.

**Room for residential purposes* Defined in regulation 2(1) as a room, or a suite of rooms, which is not a dwelling-house or a flat and which is used by one or more persons to live and sleep and includes a room in a hostel, an hotel, a
boarding house, a hall of residence or a residential home, but does not include a room in a hospital, or other similar establishment, used for patient accommodation.

Seasonal coefficient of performance (SCOP) A measure of the efficiency of a heat pump over the designated heating season, measured using the procedures in BS EN 14825.

Seasonal energy efficiency ratio (SEER) The total amount of cooling energy provided by a single cooling unit over a year, divided by the total energy input to that single cooling unit over the same year.

Sequence control Enables two or more heating boilers to be switched on or off in sequence when the heating load changes.

Simple payback The amount of time it will take to recover the initial investment through energy savings, calculated by dividing the marginal additional cost of implementing an energy efficiency measure by the value of the annual energy savings achieved by that measure, taking no account of VAT. The following guidance should be used.

• The marginal additional cost is the additional cost (materials and labour) of incorporating, for example, additional insulation – not the whole cost of the work.

• The cost of implementing the measure should be based on prices current at the date when the application is made to the building control body and be confirmed in a report signed by a suitably qualified person.

• The annual energy savings should be estimated using the National Calculation Methodology Modelling Guide.

• The energy prices that are current when the application is made to the building control body should be used when evaluating energy savings. Current prices are given on the BEIS website, at: https://www.gov.uk/government/collections/quarterly-energy-prices.

Simplified building energy model One of the current approved procedures for assessing the performance of a building, in line with this document.

Specialist process lighting Lighting to illuminate specialist tasks within a space rather than the space itself. Specialist process lighting includes theatre spotlights, projection equipment, lighting in TV and photographic studios, medical lighting in operating theatres and doctors’ and dentists’ surgeries, illuminated signs, coloured or stroboscopic lighting, and art objects with integral lighting, such as sculptures, decorative fountains and chandeliers.

Standard Assessment Procedure The current approved procedure for assessing the performance of dwellings in line with Approved Document L, Volume 1: Dwellings. The Standard Assessment Procedure is detailed in The Government’s Standard Assessment Procedure for Energy Rating of Dwellings version 10.

Target emission rate The maximum CO2 emission rate for the building, expressed as kgCO2/(m2.year).

Target primary energy rate The maximum primary energy use for the building in a year, expressed as kWhPE/(m2.year).

Thermal bridging Occurs when part of a thermal element has significantly higher heat transfer than the materials surrounding it.

**Thermal element* Defined in regulation 2(3) and 2(4) as follows. 2(3) In these Regulations “thermal element” means a wall, floor or roof (but does not include windows, doors, roof windows or roof-lights) which separates a thermally conditioned part of the building (“the conditioned space”) from:

a. the external environment (including the ground); or

b. in the case of floors and walls, another part of the building which is

i. unconditioned;

ii. an extension falling within class 7 of Schedule 2; or

iii. where this paragraph applies, conditioned to a different temperature, and includes all parts of the element between the surface bounding the conditioned space and the external environment or other part of the building as the case may be.

2(4) Paragraph 2(3)(b)(iii) only applies to a building which is not a dwelling, where the other part of the building is used for a purpose which is not similar or identical to the purpose for which the conditioned space is used.

Thermal envelope The combination of thermal elements of a building that enclose a particular conditioned indoor space or groups of indoor spaces.

Thermal separation Occurs where a building and a conservatory or porch are divided by walls, floors, windows and doors to which one of the following applies.

• The U-values are similar to, or in the case of a newly constructed conservatory or porch not exceeding, the U-values of the corresponding exposed elements elsewhere in the building.

• In the case of a newly constructed conservatory or porch, windows and doors have similar draught-proofing provisions as the exposed windows and doors elsewhere in the building.

Thermostatic room controls A device or system that automatically controls the output of heating and/or cooling emitters to control the temperature in each room (or, where justified, a heating zone) independently where heating and/or cooling is provided by a fixed building service.

Total useful floor area The total area of all enclosed spaces, measured to the internal face of the external walls. When calculating total useful floor area, both of the following should be taken into account.

• The area of sloping surfaces such as staircases, galleries, raked auditoria and tiered terraces should be taken as their area on plan.

• Areas that are not enclosed, such as open floors, covered ways and balconies, should be excluded.

NOTE: This area is the gross internal floor area as measured in accordance with the Code of Measuring Practice by the Royal Institution of Chartered Surveyors (RICS).

U-value A measure of the ability of a building element or component to conduct heat from a warmer environment to a cooler environment. It is expressed as the quantity of heat (in watts) that will flow through 1m2 of area divided by the difference in temperature (in degrees K) between the internal and external environment. The unit is W/(m2·K).

Weather compensation A system which enables the operating flow temperature of a heating system to be varied. An external sensor communicates with one inside the boiler. The temperature is varied by either of the following.

• Modulating the heat generator output (direct acting).

• Using a mixing valve to adjust the flow temperature to the heat emitters.

Wet heating system When a heating appliance (usually a boiler) produces hot water which is distributed around the building to heat emitters.

Appendix B: Lighting Energy Numeric Indicator (LENI)

B1 The Lighting Energy Numeric Indicator (LENI) method is an alternative approach for complying with the standards for lighting given in Section 6 of this approved document.

B2 The LENI should not exceed the lighting energy limit specified in Table B1 for a given illuminance and number of hours run.

Step 1: Determine the lighting energy limit from Table B1.

If display lighting is used, the lighting energy limit may be increased by the value given for normal display lighting for the area of the room where display lighting is used.

Step 2: Calculate the parasitic energy use (Ep). If the parasitic energy use is unknown, an allowance of 0.3W/m2 should be made for any control system. If no lighting control system is used, then Ep = 0.

Step 3: Determine the total power of lighting (Pl).

Step 4: Determine the occupancy factor (Fo). If no automatic control is used, then Fo = 1. If controls turn off the lights within 20 minutes of the room being empty, then Fo = 0.8.

Step 5: Determine the factor for daylight (Fd). If no daylight-linked dimming system is used, then Fd = 1. If the electric lighting dims in response to daylight being available, then in areas with adequate daylight Fd = 0.8. This may be taken as all areas within 6m of a window wall or in areas where 10% or more of the roof is translucent or made up of rooflights.

Step 6: Determine the constant illuminance factor (Fc). Systems that control the lighting in this way have Fc = 0.9, and those that do not have Fc = 1.

Step 7: Calculate the daytime energy use (Ed).

The daytime energy use is:

Ed(%) = (Pl× Fo× Fd× Fc× Td)/1000

Step 8: Calculate the night-time energy use (En).

The night-time energy use is:

En(%) = (Pl× Fo× Fc× Tn)/1000

Step 9: Calculate total energy (kWh) per square metre per year (LENI).

The total energy per square metre per year is the sum of the daytime, night-time and parasitic energy uses per year divided by the area (A), as set out in the formula below.

LENI (%) = (Ep+ Ed+ En)/A

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Table B1 Recommended maximum LENI (kWh per square metre per year) in new and existing buildings

Appendix C: Reporting evidence of compliance

BRUKL report

C1 The Building Regulations UK Part L (BRUKL) report should be provided to the building control body and to the building owner to show that building work complies with the energy efficiency requirements.

C2 The Simplified Building Energy Model (SBEM) will produce the BRUKL report for the building as a standard output option.

C3 Two versions of the BRUKL report should be produced, using the approved software.

a. The first, the design stage BRUKL report, before works begin, to include all of the following.

i. The target primary energy rate and building primary energy rate.

ii. The target emission rate and building emission rate.

iii. A supporting list of specifications.

b. The second, the as-built BRUKL report, to include all of the following.

i. The target primary energy rate and as-built building primary energy rate.

ii. The target emission rate and as-built building emission rate.

iii. A supporting list of specifications and any changes to the list of specifications that was provided at design stage.

The building control body can then use these reports to help check that what was designed has been built. The software includes a facility to compare the design stage and as-built data input files and automatically produces a schedule of changes.

C4 The as-built BRUKL report should be signed by the energy assessor to confirm that the as-built calculations are accurate.

C5 The as-built BRUKL report must be signed by the client (usually the developer or housebuilder) to confirm that the building has been constructed or completed according to the specifications in the report.

Appendix D: Measures for consequential improvements

D1 For an existing building with a total useful floor area of over 1000m2, additional work may be required to improve the overall energy efficiency of the building if proposed work consists of or includes any of the following.

a. An extension.

b. Providing any fixed building service in the building for the first time.

c. Increasing the capacity of any fixed building service (which does not include doing so on account of renewable technology).

D2 Additional works to improve energy efficiency as required in these circumstances are known as consequential improvements and are described in detail in Section 12.

Measures usually to be installed whenever consequential improvements are required

D3 Energy efficiency improvements to the building are required whenever consequential improvements apply. All technically, functionally and economically feasible measures should be implemented, with the requirement for consequential improvements being met based on the value of the principal works in some circumstances. This is outlined in Section 12.

D4 The energy efficiency improvements in Table D1 can be considered technically, functionally and economically feasible in normal circumstances. As such, these measures should usually be installed when consequential improvements are required. These should be installed at least to the extent outlined in Table D1, based on the value of the principal works, as outlined in Section 12.

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Table D1 Energy efficiency measures which should usually be installed whenever consequential improvements are required

Additional measures usually to be installed when consequential improvements are required following changes to fixed building service provision

D5 When consequential improvements apply as a result of providing a fixed building service in the building for the first time or increasing the capacity of an existing fixed building service, additional energy efficiency improvements to those parts of the building served by the service should be made. The extent of these measures should not be based on the value of the principal works, as outlined in Section 12. All technically, functionally and economically feasible measures to improve the parts of the building served by the service to meet the requirements of Part L should be implemented.

D6 The measures in Table D2 improve the energy efficiency of those parts of the building served by the service, and can be considered technically, functionally and economically feasible in normal circumstances whenever these additional measures are required.

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Table D2 Additional energy efficiency measures which should usually be installed

Appendix E: Hierarchy for establishing seasonal efficiencies of existing boilers

E1 When a heating system is being replaced in an existing building, paragraph 5.4 should be followed.

The seasonal efficiency of the appliance being replaced, if unknown, should be established by following the hierarchy set out below. This is based upon the Non Domestic EPC Conventions for England & Wales Issue 7.1.

Use Energy Technology List (ETL) product list part load values at 30% and 100% load.
Use current Product Characteristics Database (PCDB) values where available.
Use either manufacturer’s information or ‘boiler plate’ information or information from a manufacturer’s technical helpdesk. Where a gross efficiency value is established for a noncondensing boiler then a deduction of 0.05 (i.e. 5%) should be made to convert it to an appropriate seasonal efficiency.
Use SAP 10 tables (up to 70kW output).
Use suitable SBEM defaults.

Appendix F: Standards referred to

BS 5422 Method for specifying thermal insulating materials for pipes, tanks, vessels, ductwork and equipment operating within the temperature range -40°C to +700°C [2009]

BS 8850 Fan coil unit performance. Determination of specific fan power. Test method [2020]

BS EN 26 Gas-fired instantaneous water heaters for the production of domestic hot water [2015]

BS EN 89 Gas-fired storage water heaters for the production of domestic hot water [2015]

BS EN 308 Heat exchangers. Test procedures for establishing the performance of air to air and flue gases heat recovery devices [1997]

BS EN 410 Glass in building. Determination of luminous and solar characteristics of glazing [2011]

BS EN 525 Non-domestic direct gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW [2009]

BS EN 621 Non-domestic gas-fired forced convection air heaters for space heating not exceeding a net heat input of 300 kW, without a fan to assist transportation of combustion air and/or combustion products [2009]

BS EN 1020 Non-domestic forced convection gasfired air heaters for space heating not exceeding a net heat input of 300 kW incorporating a fan to assist transportation of combustion air or combustion products [2009]

BS EN 1507 Ventilation for buildings. Sheet metal air ducts with rectangular section. Requirements for strength and leakage [2006]

BS EN 1886 Ventilation for buildings. Air handling units. Mechanical performance [2007]

BS EN 12237 Ventilation for buildings. Ductwork. Strength and leakage of circular sheet metal ducts [2003]

BS EN 12809 Residential independent boilers fired by solid fuel. Nominal heat output up to 50 kW. Requirements and test methods [2001 + A1: 2004]

BS EN 12831 Energy performance of buildings

BS EN 12831-1 Method for calculation of the design heat load. Space heating load, Module M3-3 [2017]

BS EN 12831-3 Method for calculation of the design heat load – Domestic hot water systems heat load and characterisation of needs, Module M8-2, M8-3. [2017]

BS EN 13403 Ventilation for buildings. Non metallic ducts. Ductwork made from insulation ductboards [2003]

BS EN 13842 Oil fired forced convection air heaters. Stationary and transportable for space heating [2004]

BS EN 14351-1 Windows and doors. Product standard, performance characteristics. Windows and external pedestrian doorsets without resistance to fire and/or smoke leakage characteristics [2006 + AMD 1:2010]

BS EN 14511-2 Air conditioners, liquid chilling packages and heat pumps for space heating and cooling and process chillers, with electrically driven compressors. Test conditions [2018]

BS EN 14825 Air conditioners, liquid chilling packages and heat pumps, with electrically driven compressors, for space heating and cooling. Testing and rating at part load conditions and calculation of seasonal performance [2018]

BS EN 15232 Energy performance of buildings. Impact of Building Automation, Controls and Building Management [2017]

BS EN 15450 Heating systems in buildings. Design of heat pump heating systems [2007]

BS EN 15502-2-1 Gas-fired central heating boilers. Specific standard for type C appliances and type B2, B3 and B5 appliances of a nominal heat input not exceeding 1 000 kW [2012 + A1: 2016]

BS EN 15502-2-2 Gas-fired central heating boilers. Specific standard for type B1 appliances [2014]

BS EN 16798-3 Energy performance of buildings. Ventilation for buildings. For non-residential buildings. Performance requirements for ventilation and room-conditioning systems [2017]

BS EN ISO 12241 Thermal insulation for building equipment and industrial Installations. Calculation rules [2008]

BS EN ISO 12567 Thermal performance of windows and doors. Determination of thermal transmittance by the hot-box method BS EN ISO 12567-1 Complete windows and doors [2010]

BS EN ISO 12567-2 Roof windows and other projecting windows [2005]

BS EN ISO 13370 Thermal performance of buildings. Heat transfer via the ground. Calculation methods [2007 incorporating corrigendum March 2009]

BS EN ISO 16484 Building automation and control systems (BACS) [2017 + A1: 2020]

Appendix G: Documents referred to

Legislation

Ancient Monuments and Archaeological Areas Act 1979, c. 46

Building (Approved Inspectors etc.) Regulations 2010, SI 2010/2215

Building Regulations 2010, SI 2010/2214 Ecodesign Commission Regulation No. 206/2012

Ecodesign Commission Regulation No. 2016/2281

Ecodesign for Energy-Related Products Regulations 2010, SI 2010/2617

Planning (Listed Buildings and Conservation Areas) Act 1990, c. 9

Documents

Building and Engineering Services Association (BESA)

(www.thebesa.com)

DW/143 A Practical Guide to Ductwork Leakage Testing [2013]

DW/144 Specification for Sheet Metal Ductwork [2016]

Building Research Establishment (BRE)

(www.bre.co.uk)

BR 443 Conventions for U-value Calculations [2019]

BR 497 Conventions for Calculating Linear Thermal Transmittance and Temperature Factors. Second Edition [2016]

Digest 498 Selecting Lighting Controls [2014]

Information Paper 1/06 Assessing the Effects of Thermal Bridging at Junctions and Around Openings in the External Elements of Buildings [2006]

National Calculation Methodology (NCM)

Modelling Guide (for buildings other than dwellings in England) [2013] Available at www.ncm.bre.co.uk

National Calculation Methodology activity database. Available at www.uk-ncm.org.uk

Simplified Building Energy Model (SBEM)

User manual and software. Available at www.ncm.bre.co.uk

Building Services Research and Information Association (BSRIA)

(www.bsria.com)

BG 26/2011 Building Manuals and Building User Guides – Guidance and worked examples [2011]

BSRIA Commissioning Guides as follows:

• BG 2/2010 Commissioning Water Systems [2010]

• BG 29/2021 Pre-Commission Cleaning of Pipework Systems. Sixth Edition [2021]

• BG 49/2015 Commissioning Air Systems [2015] Chartered Institution of Building Services Engineers (CIBSE)

(www.cibse.org)

CIBSE Commissioning Codes as follows:

• Commissioning Code A Air Distribution Systems [2006]

• Commissioning Code B Boilers [2002]

• Commissioning Code C Automatic Controls [2001]

• Commissioning Code L Lighting [2018]

• Commissioning Code M Management [2003]

• Commissioning Code R Refrigeration [2002]

• Commissioning Code W Water Distribution Systems [2010]

Guide A Environmental Design [2015]

Guide B1 Heating [2016]

Society of Light and Lighting (SLL) Lighting Handbook [2018]

TM23 Testing Buildings for Air Leakage [2022]

TM31 Building Log Book Toolkit [2006]

TM39 Building Energy Metering [2009]

TM54 Evaluating Operational Energy Use at the Design Stage [2022]

Department for Business, Energy and Industrial Strategy (BEIS)

(www.gov.uk/beis)

The Government’s Standard Assessment Procedure for Energy Rating of Dwellings, SAP 10. Available at www.bregroup.com/sap/sap10/

Current Energy Prices. Available at www.gov.uk/government/organisations/department-of-energyclimate-change/about/statistics#energy-pricestatistics

Energy Technology List. Availale at www.gov.uk/guidance/energy-technology-list

Department for Levelling-Up, Housing and Communities

(www.gov.uk/dluhc)

Approved software for the production of nondomestic

Energy Performance Certificates (www.gov.uk/government/publications/department-forcommunities-
and-local-government-approvedsoftware-for-the-production-of-non-domesticenergy-performance-certificates-epc)

National Calculation Methodology Modelling Guide (for buildings other than dwellings inEngland) [2021]. Available at: https://www.uk-ncm.org.uk/

Glass and Glazing Federation (GGF)

(ggf.org.uk)

Glazing Manual Data Sheet 2.3, Guide to the Calculation of Energy Ratings for Windows, Roof Windows and Doors [2016]

Historic England (historicengland.org.uk)

Energy Efficiency in Historic Buildings: Application of Part L of the Building Regulations to Historic and Traditionally Constructed Buildings [2017]

Ministry of Housing, Communities and Local Government (MHCLG)

Manual to the Building Regulations: A Code of Practice for Use in England [2020]

National Association of Rooflight Manufacturers (NARM)

(www.narm.org.uk)

Technical Document NTD02 Assessment of Thermal Performance of Out-of-plane rooflights [2010]

Non-Domestic Energy Performance Certificate (NDEPC) Conventions Group

Non Domestic EPC Conventions for England & Wales Issue 7.1.

Thermal Insulation Manufacturers and Suppliers Association (TIMSA)

(timsa.org.uk)
HVAC Guidance for Achieving Compliance with Part L of the Building Regulations [2006]

Appendix A~G