| | £ | £/m2 GIFA | % |
| Demolition and alterations | 3,163,300 | 265.82 | 17.57 |
| Allowance for strip-out: item @ £500,000 | | | |
| Allowance for general demolition works, services strip-out, asbestos removal, temporary propping: item @ £560,000 | | | |
| Alterations to existing lightwell walls, including blocking up and enlarging existing openings, work to windows, etc: item @ £340,000 | | | |
| Breaking out local areas of existing load-bearing masonry, temporary support, forming new padstones, disposal: item @ £100,000 | | | |
| Demolish load-bearing walls and chimneys and adjacent upper-floor structure, temporary support, padstones, new steel structure: item @ £600,000 | | | |
| Demolish load-bearing walls and chimneys and adjacent upper-floor structure, temporary support, padstones, new steel structure: item @ £600,000 | | | |
| Propping load-bearing wall structure to allow insertion of structural steel: item @ £150,000 | | | |
| Demolish existing non-load-bearing walls, disposal: 1,860m2 @ £35 | | | |
| Break out floor slabs in isolated areas: 1,035m2 @ £120 | | | |
| Localised breaking out of slabs to insert structural steel: 800 nr @ £340 | | | |
| Infill existing slabs where structure removed: 1,600m2 @ £260 | | | |
| Alterations to pavement lights to form ventilation openings, waterproofing: item @ £36,000 | | | |
| Substructure | 257,900 | 21.67 | 1.43 |
| Alterations to drainage: item @ £65,000 | | | |
| Underpinning existing structure: item @ £80,000 | | | |
| New core foundations, including breaking through existing slabs, excavation, disposal, 1,000mm-deep reinforced concrete raft foundation: 170m2 @ £570 | | | |
| New basement slab to cores, 150mm thick: 200m2 @ £80 | | | |
| Frame and upper floors | 3,053,400 | 256.59 | 16.96 |
| Structural steelwork generally; UB and UC sections, erection, fire protection: 470t @ £2,500 | | | |
| Extra over for erection within existing structure, including connection details, splicing, etc: 470t @ £2,000 | | | |
| 130mm-thick reinforced concrete slab on permanent formwork, including reinforcement as infill to stair cores and lightwells: 1,090m2 @ £110 | | | |
| Alterations to retained upper-floor structure, strengthening and sealing on both sides in structural plywood: 7,350m2 @ £100 | | | |
| Fire barriers to risers with open-mesh plant platforms: 250m2 @ £190 | | | |
| Allowance for the testing and replacement of existing eye-bolts: item @ £36,000 | | | |
| Roof | 1,233,000 | 103.61 | 6.85 |
| Allowance for repairs to existing roof: item @ £340,000 | | | |
| Roof-level steelwork, erection, fire protection: 78t @ £2,000 | | | |
| Insitu concrete roof slab; metal deck and insitu concrete, including upstand and works to existing parapet: 280m2 @ £170 | | | |
| Single-ply roof membrane, including insulation, paving slabs: 320m2 @ £160 | | | |
| Open mesh flooring to plant deck: 440m2 @ £150 | | | |
| Mansard roof, including rafters, slate tiles, flashings, etc: 1,190m2 @ £280 | | | |
| Allowance for new aluminium rainwater goods; detailing to existing building: item @ £125,000 | | | |
| Sheet cladding to new lightwell: 400m2 @ £160 | | | |
| Access ladders, latchway, stairs to platforms and galvanized roof balustrading: item @ £50,000 | | | |
| Stairs | 184,000 | 15.46 | 1.02 |
| Main steel internal staircases; handrails and balustrades (rate per flight): 18 nr @ £8,000 | | | |
| Additional stairs, balustrades and handrails: item @ £40,000 | | | |
| External walls, windows and doors | 1,177,200 | 98.92 | 6.54 |
| Allowance for repairs and cleaning to existing facade, including upgrade to insulation: item @ £410,000 | | | |
| New glazed office entrance screens: item @ £140,000 | | | |
| Secondary glazing to existing windows, including blinds: 1,000m2 @ £190 | | | |
| Allowance for renovations to existing windows and glazed doors, including replacement ironmongery: item @ £250,000 | | | |
| Plant area louvres: 560m2 @ £300 | | | |
| Allowance for temporary hoardings to retail units, 4m high: 480m2 @ £40 | | | |
| Internal walls and partitions | 82,900 | 6.97 | 0.46 |
| Reinforced concrete walls to lift pit, 100mm-thick: 28m2 @ £120 | | | |
| 150mm-thick blockwork walls: 930m2 @ £50 | | | |
| Additional masonry in core walls and infill to voids: item @ £33,000 | | | |
| Internal doors | 285,800 | 24.02 | 1.59 |
| MDF-faced non-fire-rated doors, ironmongery (average rate per leaf): 175 nr @ £850 | | | |
| Laminated-faced, 30-minute fire-rated doors, ironmongery (average rate per leaf): 70 nr @ £1,100 | | | |
| Glass doors, 30-minute fire-rated doors, ironmongery, single-leaf only: 20 nr @ £3,000 | | | |
| Wall finishes | 529,600 | 44.50 | 2.44 |
| Reception finishes, stone cladding and timber panels: item @ £140,000 | | | |
| Lobby finishes, timber panels: 90m2 @ £400 | | | |
| Plasterboard lining to existing perimeter walls and window reveals, skim coat: 6,400m2 @ £30 | | | |
| Column casings; skim coat: 1,000m2 @ £60 | | | |
| Emulsion paint to existing perimeter walls, lightwell walls, columns: 7,400m2 @ £4 | | | |
| Dust sealer to basement and ground-floor walls: 2,000m2 @ £6 | | | |
| Allowances for enhanced finishes: item @ £60,000 | | | |
| Floor finishes | 138,800 | 11.66 | 0.77 |
| Stone and composite floor tiling, average rate: 280m2 @ £200 | | | |
| Extra for lightweight concrete infill: 100m2 @ £300 | | | |
| Rubber and vinyl tiles including skirtings, screeds, average rate: 290m2 @ £80 | | | |
| Carpet tiles including skirtings, screeds: 160m2 @ £60 | | | |
| Entrance mats: item @ £10,000 | | | |
| Allowance for floor sealers: item @ £10,000 | | | |
| Ceiling finishes | 359,900 | 30.24 | 2.00 |
| Plasterboard suspended ceiling: 795m2 @ £40 | | | |
| 2 layers of plasterboard as ceiling lining: 795m2 @ £40 | | | |
| 1 layer of plasterboard ceiling to offices areas including skim coat: 7,350m2 @ £30 | | | |
| Paint finish: 8,940m2 @ £4 | | | |
| Allowance for feature ceilings in landlord’s areas: item @ £40,000 | | | |
| Furniture and fittings | 179,200 | 15.06 | 1.00 |
| Reception desk: item @ £35,000 | | | |
| Allowance for additional furniture in landlord’s areas: item @ £15,600 | | | |
| Fitting out to WCs, including vanity units, towel rails etc: 31 nr @ £2,600 | | | |
| Signage – directory and statutory: item @ £30,000 | | | |
| Fire extinguisher cabinets: item @ £18,000 | | | |
| WCs, basins and sundry fittings: 31 nr @ £2,750 | | | |
| Extra for fittings for disabled toilets: 11 nr @ £950 | | | |
| Cleaners’ sink and taps: 6 nr @ £800 | | | |
| Disposal installations | 123,000 | 10.34 | 0.68 |
| Waste, soil and vent pipework: 10,250m2 @ £8 | | | |
| Rainwater installation: 10,250m2 @ £4 | | | |
| Hot and cold water installations | 82,000 | 6.89 | 0.44 |
| Hot and cold water installation; incoming supply, localised water heaters: 10,250m2 @ £8 | | | |
| Heating air treatment and ventilation | 854,800 | 71.83 | 4.75 |
| Modular boiler plant, plant room and riser distribution: 10,250m2 @ £28 | | | |
| Chiller, plant room and riser distribution: 10,250m2 @ £19 | | | |
| Air-handling unit and riser ductwork: 10,250m2 @ £32 | | | |
| Entrance area ventilation and cooling: item @ £21,000 | | | |
| Toilet extract ventilation: item @ £24,000 | | | |
| Electrical installation | 823,500 | 69.20 | 4.58 |
| New incoming supply: item @ £173,000 | | | |
| LV mains and sub-mains distribution: 10,250m2 @ £24 | | | |
| Small power to landlord’s areas: 10,250m2 @ £6 | | | |
| Electrical supplies to mechanical plant: 10,250m2 @ £8 | | | |
| Lighting to basement and landlord’s areas: 3,650m2 @ £40 | | | |
| Enhanced lighting in reception and other areas: item @ £105,000 | | | |
| Allowance for capped-off supply to retail units: item @ £10,000 | | | |
| Gas installations | 12,000 | 1.01 | 0.20 |
| Incoming gas supply: item @ £12,000 | | | |
| Lift installations | 396,000 | 33.28 | 2.14 |
| 13-person (1,000kg) electric passenger lifts, 1.6m/s: 3 nr @ £132,000 | | | |
| Protective installations | 38,500 | 3.24 | 0.21 |
| Lightning protection: item @ £14,500 | | | |
| Earthing and bonding: item @ £24,000 | | | |
| Communication installations | 216,800 | 18.22 | 1.21 |
| Fire alarm and smoke detection: 10,250m2 @ £9 | | | |
| Intruder alarm: item @ £20,000 | | | |
| Disabled WC alarm system and wheelchair refuge call points: item @ £21,000 | | | |
| CCTV allowance for six cameras: item @ £15,500 | | | |
| IT containment and security wireways: item @ £68,000 | | | |
| Specialist installations | 164,000 | 13.78 | 0.91 |
| BMS controls: 10,250m2 @ £16 | | | |
| Builder’s work in connection | 420,000 | 35.29 | 2.33 |
| Builder’s work generally: item @ £420,000 | | | |
| Preliminaries and contingencies | 4,125,900 | 346.55 | 22.91 |
| Management costs, site establishment and site supervision. Contractor’s preliminaries, overheads and profit @ 22%: item @ £3,070,000 | | | |
| Allowance for design reserve @ 3%: item @ £970,000 | | | |
| Testing and commissioning of building services installations: item @ £60,000 | | | |
| Total construction cost (shell and core) | 18,000,000 | 1,512.60 | 100.00 |
| (m2 rate based on GIFA) | | | |
