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54 economics.cost model

07 Cost breakdown

The cost breakdown is based on a building services reflect this. variation in cost between must be included in the
four-storey college building with The rates are based on a schemes can be wide because of submission to the LSC:
space arranged around an atrium. design-and-build contract, the college’s discretion with ■ Demolition and site
The scheme has a number of procured via a two-stage tender. regard to design standards in preparation
sustainability features including Rates are current in 2nd quarter response to location, affordability ■ External works and services
displacement ventilation, a 2007 for a south-east location and so on. Costs for the scope of ■ Loose furniture, fittings and
high-performance external The specification and rates in work described in this model can operating equipment
envelope and a green roof. this model reflect a high-quality range from about £1,700/m2 to ■ Decant costs
The building is specified to be scheme that addresses the more than £2,200/m2. ■ Professional fees and VAT.
highly robust and the rates for Learning and Skills Council’s However, the following items These will typically increase the
partitions, doors, finishes and (LSC) design-led agenda. The excluded from the breakdown cost to more than £3,000/m2.

b Cost breakdown

Total cost £/m2 % Total cost £/m2 %

£ gifa £ gifa
Cladding; metal-faced composite cladding panels; cladding
Substructure 1,832,500 130.89 6.52 rails: 2490m2 @ £410
Piled foundations; 600 diameter rotary bored piles; pile caps; Curtain-walling; stick system with double-glazed windows
ground beams: 4,250m2 @ £310 and metal-faced spandrel panels: 1,090m2 @ £470
Ground slab; 250 thick; excavation and disposal: 4,250m2 @ £100 Powder-coated aluminium double-glazed ribbon windows;
Lift pits: 6 nr @ £15,000 window boards: 2,270m2 @ £350
Extra over curtain wall and ribbon windows for opening lights;
Frame and upper floors 2,995,500 213.96 10.65 automatic actuators included in controls: 850m2 @ £200
Structural steelwork; UB and UC sections: 820t @ £1,700 Solar shading; fixed aluminium louvres: 600 m @ £200
Structural steelwork; hollow sections: 50t @ £2,500 Allowance for soffit cladding, insulated metal panels: 400m2 @ £350
Fire protection to steelwork: 16,150m2 @ £20 Allowance for column cladding, curved metal panels: Item @ £40,000
Allowance for column encasement: 2,100m @ £85 Glazed main entrance doors; revolving door with pass doors:
Upper floors, thermodeck hollowcore planks: 9,750m2 @ £100 2 nr @ £35,000
Fire escape doors; steel-faced double doors in powder-coated
Roof 2,031,500 145.11 7.22 frames; ironmongery: 16 nr @ £2,000
Insitu concrete roof slab; metal deck and insitu concrete: 3,450m2 @ £90 Loading bay doors: Item @ £7,000
Flat roof, single-ply membrane including screed, insulation, trims, Aluminium louvres to plant rooms etc: 400m2 @ £400
upstands, flashings, linings to gutters, paving slabs to
30% of area: 3,450m2 @ £115 Internal walls and partitions 1,245,300 88.95 4.43
Extra for green roof construction; strengthening to roof slab; Single-glazed screens to atrium: 380m2 @ £350
sedum blanket; filter fleece and drainage layer: 1,500m2 @ £135 Blockwork; average rate for thickness ranging from
Atrium roof; hollow section framing, aluminium-framed 100 to 190mm: 5,530m2 @ £45
double-glazed units: 1,200m2 @ £800 Extra for twin-leaf acoustic wall construction: 3,050m2 @ £14
Extra for upstands and fascia cladding: 400m @ £80 Drywall partition; 1 hour FR; heavy duty boarding: 7,630m2 @ £70
Extra for soffits to roof overhangs: 240m2 @ £55 Glazed screen partitions: 610m2 @ £340
Mansafe system: Item @ £34,000 Allowance for folding partitions: Item @ £40,000
Roof-level drainage installation; symphonic: 4,250m2 @ £10 Toilet cubicles: 56 nr @ £700
Allowance for plant platforms, walkways etc: Item @ £40,000
Internal doors 651,800 46.56 2.32
Stairs 468,500 33.46 1.66 Solid core fire-rated doors and hardwood frames;stainless steel ironmongery
Feature stairs to atrium; projecting steel stairflights with (average rate per leaf for single and double doors): 270 nr @ £1,200
semi-circular half landings; glass balustrades with stainless Doors and hardwood frames; non fire-rated; stainless steel ironmongery
steel handrails (rate per flight): 8 nr @16,000 (average rate per leaf for single and double doors): 270 nr @ £900
Precast concrete internal staircases with half landings; Glazed access doors to atrium walkways: 6 nr @ £3,400
painted steel handrails and balustrades; including allowance Extra for magnetic catches to double fire doors: 46 nr @ £1,400
for wall, floor and ceiling finishes (rate per flight): 20 nr @ £13,000
Glazed feature balustrade with stainless steel handrail Wall finishes 599,600 42.83 2.13
to part atrium edge: 100m @ £700 Emulsion paint: 19,500m @ £4
2

Miscellaneous access stairs and cat ladders: Item @ £10,500 Plasterboard lining and emulsion paint to wall surfaces
generally: 5,040m2 @ £40
External walls, windows and doors 3,814,600 272.47 13.56 Ceramic tiling: 2,700m2 @ £50
Rendered blockwork and architectural blockwork; insulation, Allowance for acoustic treatments: Item @ £85,000
lightweight steel framing: 2770m2 @ £270 Allowance for column casings: Item @ £100,000

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A glass wall and concrete columns

mark the “gateway to learning” in
Wilkinson Eyre’s refurbishment
of City and Islington College

b Cost breakdown (continued)

Total cost £/m2 % Total cost £/m2 %

£ gifa £ gifa

Floor finishes 1,104,500 78.89 3.93 Sanitary installations 140,000 10.00 0.50
70 deep screed: 4,100m2 @ £20 WCs and fittings: 50 nr @ £410
Fully accessible raised floor: 8,700m2 @ £40 Extra for disabled fittings: 8 nr @270
Edge fixed carpet; hardwood skirtings: 7,500m2 @ £35 Urinals and fittings: 20 nr @ £340
Limestone tiling: 1,200m2 @ £160 Wash handbasins and fittings: 70 nr @ £410
Ceramic tiling: 500m2 @ £70 Shower in cubicle, tray, fittings complete: 8 nr @ £1,400
Vinyl flooring, coved skirtings: 3,000m2 @ £50 Classroom sinks: 20 nr @ £470
Epoxy floor paint: 600m2 @ £15 Laboratory sinks: 15 nr @ £270
Entrance matting and matwells: Item @ £26,000 Cleaners sinks: 4 nr @ £680
Drinking fountains: 8 nr @ £680
Ceiling finishes 516,300 36.88 1.84 Allowance for IPS panels; pre-plumbed: 140 nr @ £350
Plasterboard ceilings on MF framing, emulsion
paint finish: 2,900m2 @ £27 Service equipment 310,000 22.14 1.10
Mineral fibre concealed grid ceiling; plasterboard Kitchen, servery and bar fit-out; complete: Item @ £310,000
margins and bulkheads; generally: 8,700m2 @ £40
Extra for acoustic treatments: Item @ £90,000 Disposal installations 168,000 12.00 0.60
Waste, soil and vent pipework: 14,000m @ £7
2

Furniture and fittings 971,700 69.41 3.46 Rainwater installation; syphonic drainage: 14,000m2 @ £5

External and internal identity, directional and statutory Hot and cold water installations 300,000 21.43 1.07
signage: Item @ £150,000 Mains water service, treatment: Item @ £30,000
Reception furniture: Item @ £80,000 Hot water storage and distribution: Item @ £120,000
IT work benches to general teaching spaces: 750 m @ £540 Cold water storage and distribution: Item @ £150,000
Laboratory work benches: 250 m @ £270
Allowance for fume cupboards and other laboratory fittings: Item @ £26,000
Allowances for lockers, shelving and storage racks: Item @ £78,000
Allowance for whiteboards, pinboards and other teaching room
fittings: Item @ £105,000
Window blinds: 870m2 @ £45
Vanitory units (cost per basin): 60 nr @ £350

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56 economics.cost model

b Cost breakdown (continued)

Total cost £/m2 % Total cost £/m2 %

£ gifa £ gifa

Space heating, air treatment and Preliminaries 4,810,200 343.59 17.11

ventilation 1,890,000 135.00 6.72 Management costs, site establishment and site supervision.
Space heating, boilers, flues, pumps, distribution in Contractor’s preliminaries, overheads and profit @ 17%:
plantrooms and risers: Item @ £200,000 Item @ £3,961,200
Distribution pipework and radiators: 14,000m2 @ £25 Testing and commissioning of building services installations;
Extra for underfloor heating to atrium: Item @ £31,000 O&M manuals: Item @ £30,000
Air handling units; ductwork in plantrooms and risers: 11,200m2 @ £25 Allowance for design reserve @ 3%: Item @ £819,000
Chillers, pumps and pressurisation units, distribution in
plantrooms and risers: 11,200m2 @ £30 Construction cost: building only 28,120,000 2008.56 100.00
Local supply and extract distribution; displacement ventilation (square metre rate based on GIFA)
with high level extract: 11,200m2 @ £40
Ventilation installation to laboratories; vacuum system
and fume cupboard extract: Item @ £70,000
c Location factors
Toilet extract ventilation: Item @ £75,000
Kitchen supply and extract ventilation: Item @ £50,000
Allowance for localised cooling to equipment rooms: Item @ £50,000 Use these factors to adjust the costs for alternative regions
Inner London 1.08
Electrical installation 1,857,000 132.64 6.60 Outer London 1.02
Mains and sub-mains distribution: 14,000m2 @ £25 South West 0.94
Small power generally: 14,000m2 @ £25 East Midlands 0.93
Electrical supplies to mechanical plant and West Midlands 0.95
equipment generally: Item @ £55,000 East Anglia 0.95
Lighting generally: 14,000m2 @ £70 Yorkshire and Humber 0.98
Emergency lighting: 14,000m2 @ £7 North West of England 0.95
External lighting generally: Item @ £24,000 North of England 1.00
Scotland 0.99
Gas installations 30,000 2.14 0.11 Wales 0.93
Incoming gas supply and distribution: Item @ £30,000

Lift installations 710,000 50.71 2.52

d Acknowledgments
10-person feature lifts with glass doors and back panels;
complete: 2 nr @ £115,000
21-person traction lift serving 4 floors: 4 nr @ £120,000
We would like to thank Chris Tremellen and Carl Dainter of Davis
Protective installations 28,000 2.00 0.10 Langdon’s specialist Further Education Group for their assistance
Lightning protection: 14,000m2 @ £1 in the preparation of this article.
Earthing and bonding: 14,000m2 @ £1

Communication installations 806,000 57.57 2.87

Fire alarm and smoke detection; interface with doorhold system;
disabled refuge comms system; induction loop alarm interface:
14,000m2 @ £20
Security system, intuder alarm, CCTV, public address:
14,000m2 @ £25 Previously … Data toolkit
Induction loop: Item @ £28,000
Disabled WC alarm system: Item @ £8,000 13 July Specialist Building’s database of
Data network, including containment: 14,000m2 @ £10 cost update cost data is an essential
20 July The tracker; resource for anyone in the
Specialist installations 350,000 25.00 1.24 Building business of procuring
BMS controls: 14,000m2 @ £25 intelligence buildings. There is an extensive
27 July Market forecast archive of cost models,
Builder’s work in connection 489,000 34.93 1.74 market forecasts, whole-life
Framing and access platforms in risers: Item @ £160,000 Coming up … costings, specialist costs,
Forming holes and chases etc – allowance @ 5%: Item @ £329,000 procurement and sustainability
10 August Mini cost model articles and many more
24 August The tracker besides.To gain access to
31 August Procurement all this information, see
www.building.co.uk/datatoolkit

BUILDING MAGAZINE 03.08.2007