The effect on housebuilders | Features

The proposed changes to U-values
U-value figures in W/m² °C
	Current value	2002	2004	After 2005
Roof	0.25	0.20	0.16	0.16
Ground floor	0.45	0.30	0.25	0.22
Exposed floor	0.45	0.30	0.25	0.22
Exposed walls	0.45	0.35	0.30	0.25
Windows, doors and rooflights	3.30	2.20	2.00	1.80