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Cost breakdown for new primary unit Chailey Heritage School
Element	Element cost (£)	Cost/m² gfa (£)	% of total cost
Substructure	148,262	118.14	6.62
Frame	148,384	118.23	6.63
Upper floors	17,403	13.87	0.78
Roof	202,386	161.26	9.04
Stairs	12,051	9.60	0.54
External walls	82,712	65.91	3.69
Windows and external doors	176,527	140.66	7.88
Internal walls and partitions	97,398	77.61	4.35
Internal doors	51,235	40.82	2.29
Wall finishes	46,510	37.06	2.08
Floor finishes	87,157	69.45	3.89
Ceiling finishes	53,029	42.25	2.37
Fittings and furnishings	44,779	35.68	2.00
Mechanical services installation	200,412	159.69	8.95
Electrical services installation	195,067	155.43	8.71
Lift installation	21,070	16.79	0.94
BWIC with services	13,000	10.36	0.58
Site works	124,379	99.11	5.56
Drainage	36,377	28.99	1.62
External services	20,307	16.18	0.91
Minor building work	25,078	19.98	1.12
Preliminaries	329,838	262.82	14.73
Contingencies	105,639	84.17	4.72
Contract sum	£2,239,000	£1,784.06	100.00
Gross floor area - 1,255m2
Source: Wenham O’Brien