| Cold Pitched Roofs | Prescribed U Value W/m2K | | (England and Wales - Part L 2006) | | | Extensions, renovation & repair work | 0.16 | | New build requirement could range between | 0.13 and 0.12 | | (Republic of Ireland-Technical Guidance Document 2006 edition) | 0.16 | (Scotland, with boiler SEDBUK-Part J) | 0.16 | | | | | Warm Pitched Roofs | Prescribed U Value W/m2K | | (England and Wales - Part L 2006) | | | Extensions, Renovation & Repair work: | 0.20 | New build requirement could range between | 0.16 and 0.14 | (Republic of Ireland -Technical Guidance Document 2006 edition) | 0.20 | (Scotland, with boiler SEDBUK -Part J) | 0.20 | | | | | Warm Flat Roofs | Prescribed U Value W/m2K | | (England and Wales - Part L 2006) | | | Extensions | 0.20 | | Renovation Repair work: | 0.25 | New build requirement could range between | 0.20 and 0.18 | (Republic of Ireland -Technical Guidance Document 2006 edition) | 0.22 | (Scotland, with boiler SEDBUK -Part J) | 0.25 | | | | | External Walls | Prescribed U Value W/m2K | | (England and Wales - Part L 2006) | | | Extensions | 0.30 | | Renovation Repair work: | 0.35 | New build requirement could range between | 0.28 and 0.25 | (Republic of Ireland -Technical Guidance Document 2006 edition) | 0.27 | (Scotland, with boiler SEDBUK -Part J) | 0.36 | | | | | Ground Floors | Prescribed U Value W/m2K | | (England and Wales - Part L 2006) | | | Extensions | 0.22 | | Renovation Repair work: | 0.25 | New build requirement could range between | 0.20 and 0.18 | (Republic of Ireland -Technical Guidance Document 2006 edition) New Build & extensions | 0.25 | (Scotland, with boiler SEDBUK -Part J) | 0.25 |
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Prescribed U Values 
