Building Regulations
England
Building Regulations England Dwellings
| Limiting U-values for new fabric elements in new dwellings | ||
| Element | Maximum u value W/m²K | |
| All Roof Types | 0.16 | |
| Limiting U-values for new fabric elements in existing dwellings | ||
| Element | Maximum u value W/m²K | |
| All Roof Types | 0.15 | |
| Limiting U-values for existing elements in existing dwellings | ||
| Maximum u value W/m²K | ||
| Element | Threshold | Improved |
| All Roof Types | 0.35 | 0.16 |
Building regulations England other than Dwellings
| Limiting U-values for new fabric elements and air permeability in new buildings | ||
| Element | Maximum u value W/m²K | |
| Flat Roof | 0.18 | |
| Limiting U-values for new fabric elements in existing buildings | ||
| Element | Maximum u value W/m²K | |
| All Roof Types | 0.18 | |
| Limiting U-values for existing elements in existing dwellings | ||
| Maximum u value W/m²K | ||
| Element | Threshold | Improved |
| All Roof Types | 0.35 | 0.16 |
Scotland
Building Standards Scotland Domestic
| Limiting U-values for new fabric elements in new buildings | |
| Element | Maximum u value W/m²K |
| All Roof Types | 0.12 |
| Limiting U-values for new fabric elements in existing dwellings | |
| Element | Maximum u value W/m²K |
| All Roof Types | 0.12 |
| Limiting U-values for individual elements | |
| Maximum u value W/m²K | |
| Element | Threshold |
| All Roof Types | 0.35 |
Building Standards Scotland Non-Domestic
| Limiting U-values for new fabric elements in new buildings | |
| Element | Maximum u value W/m²K |
| Flat Roof | 0.16 |
| Limiting U-values for new fabric elements in existing buildings | |
| Element | Maximum u value W/m²K |
| All Roof Types | 0.16 |
| Limiting U-values for existing elements in existing dwellings | |
| Maximum u value W/m²K | |
| Element | Threshold |
| All Roof Types | 0.35 |