Volume 1 – Domestic Metrics for Compliance (England)
Specification for the Notional Dwelling, Table 1.1, Part L 2021.
Volume 1 – Domestic Metrics for Compliance (Wales)
Specification for the Notional Dwelling, Part L2022, Appendix E.
Volume 2 – Non-domestic, Metrics for Compliance (England)
Specification for the Notional calculations are taken from the “National Calculation Methodology” (MCN) 2021 edition (England).
Volume 2 – Non-domestic, Metrics for Compliance (Wales)
Specification for the Notional calculations are taken from the “National Calculation Methodology” (MCN) 2022 edition (Wales).
The Government’s FHS Consultation is considering the following two Options.
Element |
Option 1 |
Option 2 |
Floor |
0.13 |
0.13 |
Walls |
0.18 |
0.18 |
Party Wall |
0.00 |
0.00 |
Roof |
0.11 |
0.11 |
Windows |
1.20 |
1.20 |
Doors |
1.00 |
1.00 |
Air Tightness m³ @ 50pa |
4.00 |
5.00 |
Thermal Bridging |
Modelled |
Modelled |
Heating |
A notional air source heat pump equivalent to ErP A++ |
A notional air source heat pump equivalent to ErP A++ |
DHW |
Hot water storage vessel, 120mm insulation |
Hot water storage vessel, 120mm insulation |
Waste Water Heat Recovery (WWHRS) |
Yes |
No |
Ventilation |
dMEV |
Natural ventilation with intermittent extract fans |
Photovoltaic |
High efficiency PV panels covering equivalent of 40% of the building footprint |
None |
Reporting Evidence of compliance, a guide to Photographic evidence requirements
Photographs should be taken for each dwelling on a development as a record during the construction of a property. The photographs should be made available to me as well as the building control body. Anyone may take the photographs.
Photographs should be taken of typical details as listed below and should be unique to each property. One photograph per detail should be recorded. Additional images, such as a closeup detail, should be provided only when necessary (see below). Photographs should be taken at appropriate construction stages for each detail when completed, but prior to closing-up works.
Photographs should be digital and of sufficient quality and high enough resolution to allow a qualitative audit of the subject detail. Close-up photographs may be needed where a long shot image provides insufficient detail.
More than one image of each detail may be needed. Geolocation should be enabled to confirm the location, date and time of each image. Each image file name should include a plot number and detail reference according to the numbers used in paragraph B7. For example, Plot 1 eaves detail would be P1/3b.