Work on existing buildings - dwellings L1B & non dwellings L2B
Elemental U value used for extensions and refurbishment:
Dwellings and non-dwellings | Building fabric | Building fabric |
Pitched Roof | 0.16 | 0.16 |
Flat Roof | 0.20 | 0.25 |
Walls | 0.30 | 0.35 |
Floors | 0.22 | 0.25 |
Windows, doors | 1.80 | 2.00 |
Notes:
* For extension work to buildings other than dwellings L2B: Where the proposed extension has a total floor area greater than 100m2 and greater than 25% of the floor area of the existing building, it should be regarded as a new building and must comply with L2A using SBEM methodology.
* * Where more than 25% of the surface area is being renovated, then the whole element should be upgraded to meet the thermal performance shown in Table above.
