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Elemental cost analysis
         
Total cost of element (£) gross floor area % of total cost Cost/m2 of 1026 m2 Quantity Unit cost of element (£)
         
Preliminaries 132 330 13.45 128.98 – –
Substructure 116 530 11.85 113.58 595 m2 195.85/m2
Frame 62 460 6.35 60.88 1 026 m2 60.88/m2
Upper floors 47 400 4.82 46.2 431 m2 109.98/m2
Roof 87 100 8.86 84.89 748 m2 116.44/m2
Stairs 9 450 0.96 9.21 2 nr 4 725.00
External walls 41 530 4.22 40.48 557 m2 74.56/m2
Windows and external doors 59 600 6.06 58.09 235 m2 227.96/m2
Internal walls and partitions 24 760 2.52 24.13 497 m2 49.82/m2
Internal doors 9 640 0.98 9.4 21 nr 459.05
Wall finishes 13 470 1.37 13.13 1285 m2 10.48 m2
Floor finishes 41 060 4.17 40.02 1014 m2 40.49/m2
Ceiling finishes 42 070 4.28 41 1073 m2 39.21/m2
Fixtures and fittings 16 190 1.65 15.78 – –
Sanitary appliances 13 860 1.41 13.51 – –
Disposal installation 1 170 0.12 1.14 – –
Water installation and heat source 51 090 5.19 49.8 – –
Electrical installation 80 130 8.15 78.1 – –
Gas installation 5 000 0.51 4.87 – –
Lift installation 12 940 1.32 12.61 – –
Builder’s work 4 300 0.44 4.19 – –
External works 78 610 7.99 76.62 – –
Drainage 32 900 3.34 32.07 – –
Amount of final account 983 590 100 958.66 – –
         
         
 
Key technical data
Roof U-value: 0.13 W/m2°C
Walls U-value: 0.26 W/m2°C
Window U-value (mid-pane): 1.9 W/m2°C
Heating demand: less than 50 W/m2 of floor area
Lighting energy use: less than 10 W/m2
Target carbon dioxide emission: 40 kg/m2/year