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  element cost cost/m2 gfa £ % of total cost
Substructure 373,500 45 1.59
Groundbearing slab; 150 mm thick reinforced insitu concrete bed, damp-proof membrane and hard core; reduced level dig and disposal     4150 m2 @ £60
Pad foundations and ground beams     4150 m2 @ £30
Frame 1,100,500 132.59 4.68
Structural steel framing; allowance based on 75 kg/m2     625 t @ £1100
Allowance for increased floor loadings in plant areas; based on 115 kg/m2     110 t @ £1100
Allowance for steelwork framing to feature lift     Item @ £20,000
Intumescent fire protection; one-hour fire protection     735 t @ £370
Upper floors 263,000 31.69 1.12
Composite floor slabs; 150 mm thick lightweight insitu concrete on metal decking; 15 kN/m2 load     4150 m2 @ £60
Extra for 19 kN/m2 load to plant areas     1400 m2 @ £10
Roof 628,800 75.76 2.67
Aluminium standing-seam roofing, structural decking, insulation and vapour barrier; including trimming to openings     2700 m2 @ £110
Composite roof slabs; 150 mm thick lightweight insitu concrete on metal decking; 19 kN/m2 load     1400 m2 @ £70
Allowance for kerbs and upstands     Item @ £10,000
Single-ply roofing membrane, tapered insulation, paving slabs on supports     1400 m2 @ £100
Rooflights; sealed double-glazed units; powder-coated aluminium framing; secondary steelwork     100 m2 @ £500
Allowance for mansafe system to standing-seam roofing     250 m @ £75
Allowance for handrails to flat roof areas     150 m @ £100
Stairs 123,000 14.82 0.52
Main stairs; precast concrete; overall rise 4 m; stainless steel balustrade and handrails; finishes     2 @ £12,000
Fire escape stairs; galvanised steel; overall rise 4 m; powder coated steel balustrade and handrails; finishes     4 @ £6000
Allowance for access platforms and stairs in plant rooms     Item @ £75,000
  element cost cost/m2 gfa £ % of total cost
External walls, windows and doors 1,665,000 200.6 7.08
Composite cladding panels; powder-coated aluminium insulated panels, cladding rails; plasterboard inner lining     4700 m2 @ £250
Composite cladding panels to support areas; powder-coated aluminium insulated panels, 25 glazing; cladding rails; plasterboard inner lining     250 m2 @ £300
Curtain walling, aluminium-framed sealed double-glazed units; colour coating; flashings; accessories     50 m2 @ £400
Louvres to plant room areas     500 m2 @ £350
Roof-level louvre screen to open plant areas; including steel support framing     400 m2 @ £400
Main entrance door set and frame; fully glazed; ironmongery and accessories     Item @ £20,000
Escape doors; steel doorsets and frames; ironmongery and accessories     15 @ £2000
Loading bay door; powered roller shutter; 9 × 5 m     Item @ £10,000
Internal partitions 174,100 20.98 0.74
Blockwork partitions 100 and 140 mm thick; head restraint     2120 m2 @ £35
Plasterboard partitions, one-hour fire rated     1750 m2 @ £55
Toilet cubicles and back panels     6 @ £600
Internal doors 177,500 21.39 0.75
Steel doorsets and frames; ironmongery and accessories; to technical areas and plant rooms     50 @ £1800
Solid core doors and frames; ironmongery and accessories; to office areas     10 @ £750
Allowance for mantrap controlled access at reception and loading bay     2 @ £30,000
Allowance for services access panels     Item @ £20,000
Wall finishes 51,900 6.25 0.22
Independent wall lining; plasterboard lining to the inner face of external walls in office areas     200 m2 @ £35
Ceramic tiles, to plasterboard     150 m2 @ £50
Plaster; two coats, 13 mm thick     400 m2 @ £9
Emulsion paint to blockwork and plaster     9600 m2 @ £3
Allowance for enhanced wall finishes in reception     Item @ £5000
Floor finishes 725,900 87.46 3.09
Raised floor; 750 mm deep cavity; bonded anti-static floor finish; to technical areas; including allowances for cavity barriers     4500 m2 @ £75
Extra for perforated tiles to 25 of technical area     1125 m2 @ £250
Raised floor; 150 mm deep cavity; to support areas; including allowances for cavity barriers     410 m2 @ £35
Raised floor; heavy duty solid tiles with natural stone finish; 150 mm high; to reception     50 m2 @ £350
Sheet vinyl on screed and lightweight concrete make-up in WC areas     40 m2 @ £70
Sheet vinyl on screed to service corridors; skirtings     500 m2 @ £45
Allowance for skirting     1100 m @ £10
Epoxy resin floor finish to slabs in technical and plant areas     7800 m2 @ £5
Ceiling finishes 103,000 12.41 0.44
Suspended ceilings; mineral fibre on concealed grid; to support areas     500 m2 @ £40
Allowance for feature ceiling to reception     Item @ £5000
Emulsion paint finish to exposed soffits     7800 m2 @ £10
Furniture and fittings 92,300 11.12 0.39
Reception desk     Item @ £15,000
Allowance for security screens; bullet proof glass     Item @ £50,000
Window blinds     65 m2 @ £35
Allowance for teapoints     Item @ £5000
Buffer strip to service corridor     250 m @ £40
Allowance for statutory and directional signage     Item @ £10,000
  element cost cost/m2 gfa £ % of total cost
Sanitary fittings 12,100 1.46 0.05
WCs, urinals, washhand basins; generally, to office areas only     19 @ £400
Allowance for fittings for disabled WCs     Item @ £2000
Allowance for hand dryers     Item @ £1500
Allowance for shower     Item @ £1000
Disposal installations 51,600 6.22 0.22
Rainwater goods; downpipes and gutters     8300 m2 @ £4
Soil, waste and vent to plant areas     2800 m2 @ £2
Soil, waste and vent to support building area     500 m2 @ £9
Condensate drainage from ACUs and FCUs     8300 m2 @ £1
Water installations 28,000 3.37 0.12
Hot and cold water services to office/support areas     500 m2 @ £28
Hot and cold water services to plant areas     2800 m2 @ £5
Space heating and air treatment 2,997,000 361.08 12.74
Chillers; 5 × 1.25 MW units to provide N+1 redundancy     5 @ £150,000
Chilled water pipework in plant rooms including primary and secondary pumps     Item @ £360,000
Air-handling plant feeding plant rooms and technical spaces     Item @ £45,000
Chilled water pipework ring to technical spaces     Item @ £450,000
Distribution ductwork in plant areas, risers and technical spaces     7800 m2 @ £15
Room cooling units to technical space @ 75 kW each     82 @ £12,500
Room cooling units to battery rooms @ 75 kW each     8 @ £12,500
Air-conditioning to office areas; two-pipe fan coil with electric reheat; chilled water distribution; condensate drainage; fan-coil units; ductwork; terminal units; heater batteries; insulation; grilles and diffusers     500 m2 @ £150
Allowance for communications room cooling     Item @ £5000
Toilet extract installation     Item @ £15,000
Kitchen extract installation     Item @ £5000
Gaseous and smoke extract systems to technical spaces complete     5000 m2 @ £10
Electrical installations 8,929,900 1075.89 37.97
Allowance for high-voltage switchgear, transformers and distribution based on a requirement of a 6 MVA dual supply     Item @ £400,000
Main and sub-main installation comprising of switchgear, power factor correction, cabling, busbar and distribution equipment     Item @ £2,000,000
Low-voltage distribution to support areas directly fed from main LV panel     500 m2 @ £15
Clean earth system; to plant rooms     2800 m2 @ £20
PDUs complete with isolating TX and an average of 160 SP outgoing ways, based on a requirement of 40 fed from UPS output panel     Item @ £100,000
Emergency Power Off installation     Item @ £15,000
Underfloor power distribution to cabinet locations, based on a requirement of 3200 cabinets dual fed terminating in standard 16 A BS 4343 socket     Item @ £800,000
Small power distribution to technical spaces for general use     5000 m2 @ £5
Small power distribution to plant areas     2800 m2 @ £15
Small power distribution to support areas; busbar and floorbox to office areas, wall mounted elsewhere     500 m2 @ £25
Lighting installation     8300 m2 @ £10
Luminaires and lamps     8300 m2 @ £25
Extra over for luminaires and lamps to support areas     500 m2 @ £50
Emergency lighting installation     8300 m2 @ £8
Power and containment to cooling units in technical spaces, based on a requirement of 82 units with dual feeds     Item @ £120,000
Power and containment to mechanical services in plant rooms     Item @ £25,000
Containment in plant rooms; trunking, tray and ladder rack     2800 m2 @ £20
Power and containment to serve BMS, CCTV and fire alarm systems in technical areas     5000 m2 @ £10
IT containment to technical spaces, based on 600 mm basket supported on channel run to cabinet locations     5000 m2 @ £15
IT containment to support areas, generally     500 m2 @ £8
Standby generator installation based on 5 1500 kVA units, providing N+1; complete with flues and 72-hour fuel storage (rate based on £160/kVA)     Item @ £1,200,000
UPS installation based on 16 nr 800 kVA (4 × 3.2 MVA) static units, providing full (2N) redundancy; 10 min autonomy (rate based on £200/kVA)     Item @ £2,560,000
UPS input/output panels and distribution     Item @ £1,000,000
  element cost cost/m2 gfa £ % of total cost
Lift installations 165,000 19.88 0.7
Glazed feature lifts; hydraulic; 13-person, serving 2 stops each     1 @ £75,000
Passenger/goods lift; hydraulic; 21-person, 1600 kg; serving 2 stops     Item @ £80,000
Dock leveller     Item @ £10,000
Protective installations 1,479,500 178.25 6.29
Earthing and bonding     8300 m2 @ £4
Lightning protection     8300 m2 @ £1
Pre-action sprinkler installation to plant areas     2800 m2 @ £35
Sprinkler installation to offices     500 m2 @ £30
Gaseous fire suppression system to technical area     5000 m2 @ £260
Leak detection     5000 m2 @ £5
Communications installations 1,052,900 126.86 4.48
Fully addressable fire and smoke detection and alarm system to plant and support areas     3300 m2 @ £18
Allowance for integration of fire and smoke detection system with gaseous extinguishing installation     5000 m2 @ £2
VESDA installation to technical areas     5000 m2 @ £50
Intruder detection, based on monitored door, windows and PIR detection     8300 m2 @ £5
Alarm installation to disabled toilets     Item @ £1500
CCTV installation to technical spaces, based on a full requirement of CCTV in all aisles between cabinets (160 fixed cameras)     Item @ £500,000
Allowance for CCTV installation to plant and support areas     Item @ £70,000
Access control system to technical spaces, based on a monitored entry and exit system, integrated with the intruder detection system     Item @ £35,000
Allowance for access control systems to plant and support areas     Item @ £40,000
Allowance for door entry system to support areas     Item @ £4000
Containment for security system     8300 m2 @ £5
Special installations 329,500 39.7 1.4
Building management system     8300 m2 @ £35
Extra for enhanced BMS in technical and plant spaces     7800 m2 @ £5
Builder’s work in connection 290,000 34.94 1.23
Additional structural steelwork to plant room     Item @ £60,000
Forming bases, plinths, holes and so on; allow 1.5%     Item @ £230,000
Preliminaries and contingencies 2,706,000 326.02 11.51
Contractor’s overheads, site establishment and site supervision; allow 8%     Item @ £1,665,000
Contingency sum; allow 5%     Item @ £1,041,000
OVERALL CONSTRUCTION COST 23,520,000 2833.73 100