Cost model: Business parks | Features

Cost of shell-and-core construction
	element cost	cost/m² GFA £	% of total cost

Substructure	403,000	66.61	8.06

Excavation, footings, column bases, filling to levels, ground slab 3100 m² @ 130

Frame and upper floors	661,500	109.34	13.23

Structural steelwork; UB and UC sections 300 t @ 1,400
Composite slab, metal deck and insitu concrete 2900 m² @ 60
Fire protection to steelwork item @ 50,000
Allowance for miscellaneous works item @ 17,500

Roof	639,500	105.7	12.79

Insitu concrete roof slab; metal deck and insitu concrete 3080 m² @ 60
Insitu concrete rooflight upstand walls 120 m² @ 160
Timber roof trusses item @ 60,000
Monopitch roof, coated aluminium roof cladding, including purlins, trims, cappings, insulation 1780 m² @ 100
Flat roof, asphalt, including insulation, trims, skirtings, flashings, linings to gutters, paving slabs 1500 m² @ 90
Mansafe system item @ 12,500
Rooflights 100 m² @ 500

Stairs	108,500	17.93	2.17

Main steel internal staircases; handrails and balustrades (rate per flight) 4 @ 8,000
Steel external staircases; handrails, balustrades, framing (rate per flight) 4nr @ 10,000
Atrium balustrading 45 m @ 700
Miscellaneous metalwork in shafts and risers Item @ 5,000

External walls, windows and doors	820,200	135.57	16.4

Coated aluminium double glazed curtain walling 150 m² @ 375
Extra for fire escape doors 8 @ 1,000
Coated aluminium double glazed window system 850 m² @ 350
Solar shading; fixed aluminium louvres 300 m @ 300
Glazed main double entrance doors @ 6,000
Aluminium wall cladding to roof level plant etc. 610 m² @ 45
Render on blockwork, insulation and boarding 550 m² @ 160
Facing brickwork in cavity walls 690 m² @ 150
Facing brick cladding to columns 675 m² @ 100
Miscellaneous masonry item @ 70,000

Internal walls and partitions	219,200	36.23	4.38

Blockwork 1200 m² @ 50
Drywall partition; 1 hour FR 570 m² @ 60
Hardwood glazed screens; 1 hour FR 180 m² @ 500
WC cubicles Item @ 35,000

Internal doors	98,000	16.2	1.96

Hardwood doors and frames; stainless steel ironmongery 80 @ 1,100
Allowance for fire containment in common areas item @ 10,000

Wall finishes	66,400	10.98	1.33

Emulsion paint to wall surfaces generally item @ 40,000
Plasterboard to cores and common areas 1650 m² @ 16

Floor finishes	75,200	12.43	1.5

Screeds to cores and common areas; 150 thick to make up levels 640 m² @ 20
Carpet tiling to common areas 170 m² @ 30
Ceramic tiling to cores and common areas 470 m² @ 90
Floor finishes to internal stairs Item @ 5,000
Entrance matting 2 @ 5,000

Ceiling finishes	52,500	8.68	1.05

Plasterboard ceiling and bulkheads; to core and common areas 1050 m² @ 50

Furniture and fittings	38,000	6.28	0.76

Granite vanitary units item @ 27,000
Glass surrounds to vanitary units item @ 5,000
Miscellaneous architectural metalwork item @ 6,000

Sanitary fittings	24,200	4	0.48

Sanitaryware and fittings; allowance 6050 m² @ 4

Disposal Installations	30,300	5.01	0.61

Waste, soil and vent pipework 6050 m² @ 2
Rainwater installation 6050 m² @ 3

Hot and cold water installations	67,300	11.12	1.35

Hot and cold water pipework to landlord's areas including mains water service 6050 m² @ 5
Hot water distribution pipework in plant rooms item @ 22,000
Roof-mounted condensing boiler item @ 15,000

Space heating air treatment and ventilation	398,000	65.79	7.96

Air handling units, chillers; ductwork, pipework, insulation 6050 m² @60
Toilet extract ventilation item @ 15,000
Cooling and ventilation installations to common areas item @ 20,000

Electrical installation	275,900	45.6	5.52

Mains and sub-mains distribution 6050 m² @ 20
Small power to landlord's areas 975 m² @ 15
Electrical supplies to mechanical plant item @ 17,500
Lighting to landlord's areas 975 m² @ 50
External feature lighting item @ 5,000
External lighting generally item @ 65,000
Electric trench heating to common areas Item @ 4,000

Gas installations	10,000	1.65	0.2

Incoming gas supply item @ 10,000

Lift installations	25,000	4.13	0.5

Ten-person hydraulic lift serving two floors 1 @ 25,000

Protective installations	8,500	1.4	0.17

Lightning protection item @ 6,000
Earthing and bonding item @ 2,500

Communication installations	36,300	6	0.73

Fire alarm and smoke detection 6050 m² @ 5
Disabled WC alarm system item @ 2,000
Allowance for containment item @ 4,000

Specialist installations	90,800	15.01	1.82

BMS controls 6,050 m² @ 15

Builder’s work in connection	10,000	1.65	0.2

Forming holes and chases etc. Allowance @ 1% Item @ 10,000

Preliminaries	841,700	139.12	16.83

Management costs, site establishment and site supervision. Contractor's preliminaries, overheads and profit @ 17% Item @ 702,000
Testing and commissioning of building services installations Item @ 15,000
Allowance for design reserve @ 3% Item @ 124,700

Total construction cost: building only	5,000,000	826.43	100
(Square metre rate based on GIFA)

Cost of fit-out to category A
	element cost	cost/m² GFA £	% of total cost

Wall finishes	75,700	14.84	4.95

Emulsion paint to walls; generally Item @ 20,000
Plasterboard lining 740 m2 @ 65
Plasterboard column casings 80 @ 95

Floor finishes	245,600	48.16	16.05

Raised access floors; medium grade 5100 m2 @ 28
Carpet tiles 5100 m2 @ 18
Softwood skirtings; painted 1100 m @ 10

Ceiling finishes	140,500	27.55	9.18

Mineral fibre tile suspended ceiling; exposed grid 5100 m2 @ 20
Bulkheads and margins 550 m @ 70

Space heating, air treatment and ventilation	510,000	100	33.33

Four pipe fancoils; hot and cold water distribution, ductwork and flexible connections, grilles and diffusers; power supply to FCUs 5100 m2 @ 100

Electrical installation	255,000	50	16.67

Lighting, emergency lighting and lighting control 5100 m2 @ 35
Small power 5100 m2 @ 15

Protective installations	3,000	0.59	0.2

Earthing and bonding item @ 3,000

Communication installations	25,500	5	1.67

Fire detection and alarm system 5100 m2 @ 5

Builder’s work in connection	8,000	1.57	0.52

Forming holes and chases etc. Allowance @ 1% Item @ 8,000

Preliminaries	266,700	52.29	17.43

Management costs, site establishment and site supervision. Contractor's preliminaries, overheads and profit @ 17% Item @ 213,700
Testing and commissioning of building services installations Item @ 15,000
Allowance for design reserve @ 3% Item @ 38,000

Total cost: category A fit-out only	1,530,000	300	100
(Square metre rate based on NIFA)

Cost of external works
	element cost	cost/m² GFA £	% of total cost

Site works	506,000	83.64	56.86

Concrete block pavings 6100 m² @ 35
Granite sett pavings 1250 m² @ 90
Precast concrete paving slabs 970 m² @ 40
Granite chippings 665 m² @ 30
Precast concrete edgings 100 m @ 10
Precast concrete kerbs 1490 m @ 30
Retaining walls; facing brick 35 m @ 155
Tree grilles 27 @ 1,100
Miscellaneous external works item @ 10,000
Allowance for topsoiling, turfing, planting item @ 30,000

Drainage	136,000	22.48	15.28

Foul and surface water drain runs 850 m @ 45
Foul and surface water manholes 18 @ 800
Sewer and surface water drainage connection item @ 6,000
Road gullies 35 @ 200
Petrol inteceptors 2 @ 4,000
Surface water attenuation; storage chambers 13 @ 4,800

External services	100,000	16.53	11.24

Water connection charge item @ 6,000
Electricity connection charge item @ 30,000
Gas connection charge item @ 18,000
Builders work in connection with external services including service trenches and access chambers item @ 46,000

Preliminaries	148,000	24.46	16.63

Management costs, site establishment and site supervision. Contractor's preliminaries, overheads and profit @ 17% item @ 126,100
Allowance for design reserve @ 3% item @ 22,300

Total construction cost: external works only	890,000	147.11	100
(Square metre rate based on GIFA)

Location factors
Outer London	1.03
South-east	1.00
South-west	0.97
East Midlands	0.93
West Midlands	0.93
East Anglia	0.97
Yorkshire and Humberside	0.95
North-west	0.94
Northern	0.94
Scotland	0.92
Wales	0.91
Northern Ireland	0.75