Regulations roundup | Features

Indicative costs for various means of complying with Part L of the Building Regulations, provided by Davis Langdon
Part L – Conservation of fuel and power in buildings	Unit	Range (£)
50 mm glass-fibre reinforced polyisocyanurate foam board, foil faced both sides below ground-floor slab	m²	8
200 mm mineral fibre mat insulation between joists at pitched roof level	m²	6
175 mm semi-rigid resin bonded mineral-wool slab between rafters	m²	15
100 mm expanded polystyrene (high-duty), flat-roof insulation, mechanically fixed to metal decking	m²	16
100 mm mineral-fibre batt full fill insulation for hollow masonry walls	m²	6
60 mm mineral wool slab partial fill insulation to hollow masonry walls	m²	9
Extra over for high performance glazing to windows and doors, clear super neutral glass to outer pane	m²	40
Extra over double glazed curtain walling for triple wall facade with interstitial blinds	m²	200
Brise soleil solar shading system, mild steel powder coated	m²	200