Costs based on final account SUBSTRUCTURE Foundations/slabs £294/m 2Concrete slab on mini-piles; hardcore and insulation SUPERSTRUCTURE Frame £3/m 2Steel columns and PFCs with bolted connections, as canopy Roof terrace £309/m 2Timber decking on warm deck covering on timber joists Rooflights £12/m 2Flushglaze dg rooflights Staircases £25/m 2Refurbishment of existing stair External walls £2/m 2Making good existing Windows £136/m 2Timber-framed dg triangular ...
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