Cost model: Affordable housing | Features

Apartment shell and core – cost breakdown
	£ element cost	£/m² gross internal floor area	% of total cost
Substructure	595,000	85.00	8.51
Substructure, piled foundations, pile caps, ground slab, site excavation and disposal, dewatering etc 1000 m² @ 550
Allowance for drainage 1000 m² @ 35
Allowance for lift pits etc 2 @ 5000
Frame and upper floors	1,322,500	188.93	18.93
Insitu reinforced concrete frame and upper floors, 250 mm thick slabs, 225 mm blade columns, allowance for forming openings 6650 m² @ 150
Balconies, primary and secondary frame, decking, balustrading 65 @ 5000
Roof	120,800	17.26	1.73
Flat roof coverings, single ply membrane, insulation, ballast; allowance for details to upstands 1000 m² @ 75
Extra for roof terraces and paving to terraces 350 m² @ 45
Allowance for roof drainage, roof sundries 1000 m² @ 15
Roof access equipment, latchways, cat ladder, access hatch, safety balustrade Item @ 15,000
Stairs	144,000	20.57	2.06
RC concrete stairs, mild steel balustrades and handrails, carpet to treads/risers 14 @ 7000
Extra over for enhanced finishes to entrance level staircases 2 @ 5000
Balustrade and parapet to terraces; polyester powder coated steel 120 m @ 300
External walls, windows and doors	1,866,000	266.57	26.70
Unitised curtain walling; polyester powder coated insulated aluminum spandrel panels; sealed double-glazed tilt and turn windows 4000 m² @ 450
Extra for doors to balconies, allowance for single leaf doors, ironmongery 65 @ 800
Entrance doors, aluminium framed glazed door and screen 1 @ 10000
External fire escape doors, metal, polyester powder coated finish to match curtain walling 2 @ 2000
Internal walls and partitions	287,000	41.00	4.11
Core walls, insitu concrete, 225 thick 420 m² @ 100
Party walls to apartments and corridors; dense concrete block to comply with Building Regulations Part E; head restraint, fire stopping 4900 m² @ 50
Internal doors	135,000	19.29	1.93
Fire doors to cores and corridors; hardwood architraves/frames, including basic ironmongery 60 @ 750
Fire doors to risers; hardwood architraves / frames, including basic ironmongery 20 @ 500
Apartment entrance doors; solid core doors, hardwood architraves/frames, including basic quality security ironmongery 100 @ 800
Wall finishes	90,000	12.86	1.29
Plasterboard to concrete and blockwork, with specialist painted finish; entrance hall 500 m² @ 50
Plasterboard to concrete and blockwork, with emulsion paint finish; lift lobbies and corridors 2600 m² @ 25
Floor finishes	94,100	13.44	1.35
Feature ceramic floor tiles, sand cement screed; entrance hall 50 m² @ 120
Heavy duty carpet, sand cement screed; corridors 1050 m² @ 60
Ceramic tile, sand cement screed; lift lobbies 170 m² @ 100
Skirtings, surface fixed skirting, painted mdf 810 m @ 10
Ceiling finishes	41,600	5.94	0.60
Painted plasterboard with feature bulkheads; reception 50 m² @ 100
Painted plasterboard on battens; lift lobbies and corridors 1220 m² @ 30
Furniture and fittings	15,000	2.14	0.21
Allowance for reception area fittings; mailboxes, signage, mats and matwells, artwork Item @ 15,000
Sanitary fittings	7,000	1.00	0.10
Allowance for cleaners sinks 14 @ 500
Disposal installations	98,000	14.00	1.40
Allowance for rainwater disposal; downpipes and connections to below-ground drainage 7000 m² @ 3
Allowance for soil, waste and overflow installations; stacks and connections to below-ground drainage 7000 m² @ 11
Water installations	125,700	17.96	1.80
Allowance for cold water storage tanks, booster pumps, mains distribution pipework, trace heating, water softener/conditioner etc 7000 m² @ 15
Hot and cold water services to landlord’s areas, including local water storage heaters 1220 m² @ 17
Space heating and ventilation	161,200	23.03	2.31
Electric panel heaters; landlord’s areas 1220 m² @ 3
Central extract system for bathrooms; ductwork, extract fans 7000 m² @ 20
Reception area air treatment Item @ 7500
Supply and extract; plantroom areas Item @ 10000
Electrical installations	177,900	25.41	2.55
Allowance for mains switchgear, cabling, containment and landlord’s distribution boards 7000 m² @ 10
Small power; landlord’s areas 1220 m² @ 6
Power supply to mechanical services 7000 m² @ 5
Lighting installation to landlord’s areas, including emergency lighting 1220 m² @ 30
Feature lighting to entrances Item @ 15000
Earthing and bonding 7000 m² @ 2
Lift installation	180,000	25.71	2.58
Lift installation; 13-person firefighting lifts serving seven storeys 2 @ 90000
Protective installations	50,600	7.23	0.72
Allowance for dry riser inlets 1220 m² @ 30
Lightning protection 7000 m² @ 2
Communications installations	123,700	17.67	1.77
Allowance for fire alarm system to landlord’s areas 1220 m² @ 35
Allowance for telephone containment only 7000 m² @ 4
Allowance for TV/Satellite system; central aerial and distribution 7000 m² @ 4
Allowance for CCTV and access control to perimeter Item @ 25000
Special Installations	28,000	4.00	0.40
Allowance for localised controls for cold water system 7000 m² @ 4
Builder’s work in connection	48,000	6.86	0.69
Forming holes and chases; firestopping. Allow 5% Item @ 48000
Preliminaries and contingencies	1,276,000	182.29	18.26
Testing and commissioning of building services installations. Allow 2.5% of services cost Item @ 25000
Contractor’s overheads, site establishment and site supervision, excluding design fees. Allow 16% Item @ 918000
Design reserve and contingency. Allow 5% Item @ 333000
Total shell-and-core cost	6,987,100	998.16	100.00
Total shell-and-core cost (£/m² net saleable floor area)			1,249.93