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Keep up to dateProject 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/m² |
Chilled water distribution within data centre to free-standing cooling units, with associated water softening plant, condensate, insulation and humidification: 1000 m² at £325/m² | £325/m² |
Space heating & ventilating systems total | £610/m² |
Ventilation system | |
Supply and extract ventilation, including dedicated gas extract system, low-level distribution, including floor grilles: 1000 m² at £135/m² | £135 |
Ventilation system total | £135/m² |
Electrical installation | |
Mains distribution with single incoming hv, generator backed lv switchgear, busbar and cabling distribution through ups system: 1000 m² at £50/m² | £50/m² |
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/m² |
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/m² |
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/m² |
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/m² |
Lighting | |
Suspended luminaires, wiring and controls: 1000 m² at £35/m² | £35/m² |
Data containment | |
Underfloor cable basket: 1000 m² at £20/m² | £20/m² |
Electrical installations total | £1035/m² |
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/m² | £35/m² |
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/m² |
Earthing and bonding: 1000 m² at £5/m2 | £5/m² |
Protective installations total | £60/m² |
Communications installations | |
Addressable fire alarm and detection system providing full L1 cover plus interface to sprinkler system: 1000 m² at £30/m2 | £30/m² |
Extra for very early warning fire detection system, installation above and below raised floor: 1000 m² at £50/m2 | £50/m² |
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/m² | £75/m² |
Communications installations total | £155/m² |
Special installations | |
Building energy management system, controls and monitoring; interface with main building management system: 1000 m² at £45/m² | £45/m² |
Special installations total | £45/m² |
Total cost of data centre services | |
Installation: | £2040/m2 |
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 | |||
£/m2 | £/m2 | £/m2 | £/m2 | |
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 |