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| Project details | |
| Cost datum | 4th quarter 2000 |
| Location | City of London |
| Gross office internal floor area (GIFA) | 35 000 m² |
| Data centre net area | 1000 m² |
| Procurement route | Competitively tendered lump sum contract with contractor’s design responsibility |
| Design criteria | |
| External design temperatures | |
| Winter | -4°C (saturated) |
| Summer | 28°C db/19°C wb |
| Internal design temperature | |
| Offices | 22°C ±2°C |
| Fresh air ventilation | 15 litres/s/person |
| Cooling loads | |
| Small power | 25 W/m² |
| Cooling | 375 W/m² |
| Primary power | |
| Equipment | 550 W/m2 |
| Lighting | 12 W/m² |
| Lighting levels | 400 lux |
| Cost breakdown | |
| Space heating ventilation systems | |
| Upgrade to base building chilled water plant for enhanced cooling to data centre, serving 375 W/m², with redundancy to n+1 standard: 1000 m² at £285/m2 | £285/³¾Â² |
| Chilled water distribution within data centre to free-standing cooling units, with associated water softening plant, condensate, insulation and humidification: 1000 m² at £325/³¾Â² | £325/³¾Â² |
| Space heating & ventilating systems total | £610/³¾Â² |
| Ventilation system | |
| Supply and extract ventilation, including dedicated gas extract system, low-level distribution, including floor grilles: 1000 m² at £135/³¾Â² | £135 |
| Ventilation system total | £135/³¾Â² |
| Electrical installation | |
| Mains distribution with single incoming hv, generator backed lv switchgear, busbar and cabling distribution through ups system: 1000 m² at £50/³¾Â² | £50/³¾Â² |
| Standby generators with redundancy to n+1 standard, controls, oil storage and distribution and flues. Generators located in the basement or on rooftops: 1500 kVA at £165/kVA | £250/³¾Â² |
| UPS back-up system, 10 minute autonomy, European batteries, controls and distribution equipment located in plant area, redundancy n+1: 1600 kVA at £215/kVA | £345/³¾Â² |
| Alternative specification | |
| Rotary diesel ups as alternative back-up to generators and ups, controls, oil storage and distribution and flues. Located in the basement or on rooftop areas, redundancy to n+1: 1500 kVA at £360/kVA saving of £55/m² | |
| Mains distribution | |
| LV switchgear, cabling, power distribution units and transfer switches to location in data centre. (six power distribution units at £22 000 plus allowance for distribution): 1000 m2 at £160/m2 | £160/³¾Â² |
| Local power supplies | |
| Underfloor supplies to cabinets, dual feed in armoured radial feeds, terminating in BS4343 outlets, dual radial-feeds to mechanical plant: 580 feeds at £300 each | £175/³¾Â² |
| Lighting | |
| Suspended luminaires, wiring and controls: 1000 m² at £35/³¾Â² | £35/³¾Â² |
| Data containment | |
| Underfloor cable basket: 1000 m² at £20/³¾Â² | £20/³¾Â² |
| Electrical installations total | £1035/³¾Â² |
| Protective installations | |
| Sprinklers (pre-action type), storage tanks, pumps, pipework distribution, control values, alarm panels and controls. Data centre installation incorporated into main sprinkler system: 1000 m² at £35/³¾Â² | £35/³¾Â² |
| Alternative specification: gaseous extinguishing system using inert gas. (An alternative to sprinkler systems, offering greater protection to equipment installed above and below the floor): 1000 m² at £280/m². Extra over-cost: £245/m² plus additional builder's work costs associated with strengthening partitions. | |
| Leak detection, installed adjacent to cooling plant pipework (generally to room perimeter): 250 m at £75/m | £20/³¾Â² |
| Earthing and bonding: 1000 m² at £5/m2 | £5/³¾Â² |
| Protective installations total | £60/³¾Â² |
| Communications installations | |
| Addressable fire alarm and detection system providing full L1 cover plus interface to sprinkler system: 1000 m² at £30/m2 | £30/³¾Â² |
| Extra for very early warning fire detection system, installation above and below raised floor: 1000 m² at £50/m2 | £50/³¾Â² |
| Security installation, cctv, intruder detection and access control linked to main system, (based on 20 cameras and four card access points): 1000 m² at £75/³¾Â² | £75/³¾Â² |
| Communications installations total | £155/³¾Â² |
| Special installations | |
| ºÃÉ«ÏÈÉúTV energy management system, controls and monitoring; interface with main building management system: 1000 m² at £45/³¾Â² | £45/³¾Â² |
| Special installations total | £45/³¾Â² |
| Total cost of data centre services | |
| Installation: | £2040/³¾2 |
| Exclusions | |
| inflation beyond 4th quarter 2000 | |
| general builders’ work | |
| specialist builders’ work installations including: floor strengthening, blast protection, screening for electro-magnetic interference | |
| fit-out works beyond the boundary of the data centre except where stated in the scope of works | |
| external works, including enhanced hv supply capacity or dual hv feeds | |
| main contractor’s overheads, profit and attendance | |
| main contract preliminaries | |
| professional and prescribed fees | |
| contingencies and design reserve | |
| tax allowances | |
| vat | |
| Table 1: Cost summary | ||||
| Element | Range within analysis | Cost model | % | |
| Maximum | Minimum | |||
| £/³¾2 | £/³¾2 | £/³¾2 |  £/³¾2 | |
| Space heating and air treatment | 595 | 650 | 610 | 29.9 |
| Ventilation systems | 125 | 150 | 135 | 6.6 |
| Electrical installations | 950 | 1155 | 1035 | 50.7 |
| Protective installations | 50 | 85 | 60 | 2.9 |
| Communications installations | 120 | 195 | 155 | 7.7 |
| Special installations | 40 | 50 | 45 | 2.2 |
| Total | 1880 | 2285 | 2040 | 100 |
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