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| A - Base building: Steel-framed, air-conditioned office | |
| Basic information | |
| Gross internal floor area: | 11,700 m² |
| Form: | Six storeys high and 15 m deep on plan |
| Construction: | Steel frame of 44 kg/m² |
| Substructure: | 200 mm groundbearing slab, bearing on to 2.5 m deep pad foundations |
| Roof: | Flat, Sarna single-membrane proprietary roofing system with parapets |
| External walls: | Mostly wall cladding with reconstituted stone. Ten per cent is polyester powder coated aluminium curtain-walling, fully glazed to clear height with double-glazed low-emissivity glass |
| Window frames: | Aluminium for about 60% of clear height |
| Windows: | Double-glazed, low-emissivity glass |
| Air-conditioning: | Chilled beams with displacement ventilation in a raised floor plenum of 400 mm deep |
| Lifts: | Three passenger and one goods |
| Ìý | Ìý |
| Capital costs (£) (excluding fees) | |
| Substructure | £544,010 |
| Structure | £2,013,435 |
| External envelope | £3,090,609 |
| Internal divisions | £528,842 |
| Finishings and fittings | £2,805,140 |
| Mechanical | £3,707,744 |
| Electrical and communications | £2,486,371 |
| Lifts | £594,093 |
| Preliminaries, overheads and profit | £2,680,646 |
| Design and construction contingency @ 8% | £1,475,933 |
| Total | £19,925,000 |
| Ìý | Ìý |
| Annual energy consumption (£) | |
| Space heating | £9,457 |
| Cooling and fans | £32,872 |
| Lighting | £14,165 |
| Other energy costs | £35,194 |
| Total (over 30-year period) | £91,688 |
| D - Environmental impact | |||||
| Ìý | Ìý | CO2 output | Ecopoints | ||
| Ìý | Quantity | Rating | Tonnes | Rating | Total |
| Steel frame with composite floors | |||||
| Pad foundations | 263 m³ | 0.31 | 81.53 | 5.3 | 1,393.90 |
| Steel frame | 515 t | 0.76 | 391.4 | 11 | 5,665.00 |
| Note: The above ratings accept the steel industry’s calculation methodology (previously questioned) | |||||
| Hot-dip galvanized steel permanent formwork | 9.215 t | 1.34 | 12.35 | 11 | 101.37 |
| 140 mm lightly reinforced concrete | 1290 m³ | 0.37 | 477.3 | 5.3 | 6,837.00 |
| Ìý | |||||
| Total for steel frame option excluding operation | Ìý | Ìý | 963 | Ìý | 13,997 |
| CO2 produced over 30 years | 30 years | 775 | 23,250 | Ìý | Ìý |
| Ìý | |||||
| CO2 total emissions for steel frame option including operation | Ìý | Ìý | 24,213 | Ìý | Ìý |
| Ìý | |||||
| Insitu concrete frame and floors | |||||
| Pad foundations | 440 m³ | 0.31 | 136.4 | 5.3 | 2,332.00 |
| Reinforced concrete columns | 323 m³ | 0.38 | 122.74 | 5.3 | 1,711.90 |
| Reinforced concrete beams | 59 m³ | 0.38 | 22.42 | 5.3 | 312.7 |
| (Taken to perimeter, but can be avoided) | Ìý | Ìý | Ìý | Ìý | Ìý |
| Reinforced concrete floors | 2675 m³ | 0.38 | 1,016.50 | 5.3 | 14,177.50 |
| Ìý | |||||
| Saving 200 mm wall height per level (approx) | –341 m² | 0.1 | -34.1 | 1.1 | –375.10 |
| Ìý | |||||
| Total for insitu concrete option excluding operation | Ìý | Ìý | 1,264 | Ìý | 18,159 |
| CO2 produced over 30 years | 30 years | 718 | 21,540 | Ìý | N/A |
| Ìý | |||||
| CO2 total emissions for insitu concrete option including operation | Ìý | 22,804 | Ìý | Ìý | Ìý |
| Ìý | |||||
| Summary of changes | |||||
| Ìý | |||||
| Overall extra for concrete option excluding building operation | Ìý | 301 (up 31%) | Ìý | 4,162 (up 30%) | Ìý |
| Ìý | |||||
| Overall saving for concrete option including building operation | 1,409 (a 6% saving on total energy costs) | Ìý | Ìý | Ìý | Ìý |
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