What do amendments to Part L mean for the way you build? | Archive Titles

U-values used to be like that, now they’ll be like this
Exposed Element	Current Regulations	Approved Document (April 2002)		Possible Future Regulations
	Part L	Part L1	Part L2	Part L1	Part L2
Walls	0.45	0.35	0.35	0.30	0.27
Floors	0.45	0.25	0.25	0.25	0.20
Pit. roof insulation between joists.	0.25	0.20	0.20	0.16	0.16
Pit. Roof insulation between Rafters	0.30	0.25	0.16	0.20	0.16
Flat Roof	0.35	0.25	0.25	0.22	0.22
Windows, doors & rooflights in metal frames	3.30	2.20	2.00	2.00	1.80
Windows, doors & r/lights in PVC / wood frames		2.00	2.00	1.80	1.8