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Keep up to dateWhole-life cost summary for three model buildings over 25 years | |||||||||
40,000 ft2 | 100,000 ft2 | 200,000 ft2 | |||||||
Total cost (拢) | Cost 拢/ft2 | % of total cost | Total cost (拢) | Cost 拢/ft2 | % of total cost | Total cost (拢) | Cost 拢/ft2 | % of total cost | |
Capital cost | 3,536,000 | 8,566,000 | 23,600,000 | ||||||
Less capital allowance | 328,848 | 796,638 | 2,194,800 | ||||||
Sub-total | 3,431,653 | 85.79 | 11.84 | 7,769,362 | 77.69 | 13.58 | 21,405,200 | 114.52 | 19.19 |
Occupancy | |||||||||
M&E maintenance | 2,142,450 | 53.56 | 7.39 | 3,174,000 | 31.74 | 5.18 | 5,819,000 | 29.10 | 4.88 |
Lifts | 55,650 | 1.39 | 0.19 | 111,300 | 1.113 | 0.18 | 166,950 | 0.83 | 0.14 |
Fabric | 526,000 | 13.15 | 1.81 | 1,315,000 | 13.15 | 2.15 | 2,630,000 | 13.15 | 2.20 |
Finance | 5,136,259 | 128.41 | 17.72 | 12,442,646 | 124.43 | 20.32 | 34,280,464 | 171.40 | 28.73 |
External land | 206,412 | 5.16 | 0.71 | 353,205 | 3.53 | 0.58 | 635,250 | 3.18 | 0.53 |
Internal planting | 156,870 | 3.92 | 0.54 | 325,290 | 3.25 | 0.53 | 598,986 | 2.99 | 0.50 |
Cleaning | 1,262,400 | 31.56 | 4.35 | 3,156,000 | 31.56 | 5.15 | 6,312,000 | 31.56 | 5.29 |
Waste | 80,850 | 2.02 | 0.28 | 206,588 | 2.07 | 0.34 | 420,000 | 2.10 | 0.35 |
Electricity | 2,385,960 | 59.65 | 8.23 | 5,964,900 | 59.65 | 9.74 | 11,929,800 | 59.65 | 10.00 |
Gas | 185,850 | 4.65 | 0.64 | 464,625 | 4.65 | 0.76 | 929,250 | 4.65 | 0.78 |
Water | 128,400 | 3.21 | 0.44 | 321,000 | 3.21 | 0.52 | 642,000 | 3.21 | 0.54 |
Reception service | 850,080 | 21.25 | 2.93 | 850,080 | 8.50 | 1.39 | 1,275,120 | 6.38 | 1.07 |
Communications | 3,224,558 | 80.61 | 11.12 | 4,372,476 | 43.72 | 7.14 | 5,417,341 | 27.09 | 4.54 |
Postroom | 398,160 | 9.95 | 1.37 | 770,070 | 7.70 | 1.26 | 833,400 | 4.17 | 0.70 |
Porterage | 398,160 | 9.95 | 1.37 | 770,070 | 7.70 | 1.26 | 1,087,600 | 5.44 | 0.91 |
Internal moves | 4,915,680 | 122.89 | 16.96 | 12,560,520 | 125.61 | 20.52 | 25,536,000 | 127.68 | 21.40 |
Security | 1,605,240 | 40.13 | 5.54 | 3,210,480 | 32.10 | 5.24 | 4,815,720 | 24.08 | 4.04 |
Catering | 2,234,498 | 55.86 | 7.71 | 4,730,939 | 47.31 | 7.73 | 5,114,063 | 25.57 | 4.29 |
Management | 1,203,750 | 30.09 | 4.15 | 2,006,250 | 20.06 | 3.28 | 3,210,000 | 16.05 | 2.69 |
Replacement | 1,890,766 | 47.27 | 6.52 | 4,117,241 | 41.17 | 6.73 | 7,670,912 | 38.35 | 6.43 |
Total | 28,987,993 | 724.70 | 100 | 61,222,679 | 612.23 | 100 | 119,323,856 | 596.62 | 100.00 |
Cost 拢/ft2 | 724.70 | 612.23 | 596.62 | ||||||
Population | 308 | 787 | 1,600 | ||||||
Cost/head | 94,211 | 77,753 | 74,577 | ||||||
Comparison of service provision in the three sizes of office | |||
40,000 ft2 | 100,000 ft2 | 200,000 ft2 | |
308 occupants | 787 occupants | 1600 occupants | |
M&E maintenance | All planned and reactive mechanical and electrical maintenance 鈥 one resident engineer and a 鈥渕ate鈥 | All planned and reactive mechanical and electrical maintenance 鈥 one resident engineer and a 鈥渕ate鈥 | All planned and reactive mechanical and electrical maintenance 鈥 working site manager, two resident engineers |
Lifts | Two hydraulic lifts | Four hydraulic lifts | Six hydraulic lifts |
Fabric | All reactive fabric maintenance | All reactive fabric maintenance | All reactive fabric maintenance |
External land | Soft and hard landscape maintenance | Soft and hard landscape maintenance | Soft and hard landscape maintenance |
Internal planting | Maintenance of internal plants 鈥 planting to reception, lift lobbies, corridors and sporadically through office | Maintenance of internal plants 鈥 planting to reception, lift lobbies, corridors and sporadically through office | Maintenance of internal plants 鈥 planting to reception, lift lobbies, corridors and sporadically through office |
Cleaning | Accommodation and window cleaning of offices. Monday to Friday plus periodics | Accommodation and window cleaning of offices Monday to Friday plus periodics | Accommodation and window cleaning of offices Monday to Friday plus periodics |
Reception service | Two receptionists Monday to Friday 9am-5.30pm | Two receptionists Monday to Friday 9am-5.30pm | Three receptionists Monday to Friday 9am-5.30pm |
Communications | Calls and line rental | Calls and line rental | Calls and line rental |
Postroom | One postroom operative Monday to Friday | Two postroom operatives Monday to Friday | Two postroom operatives Monday to Friday |
Porterage | One porter Monday to Friday | Two porters Monday to Friday | Three porters Monday to Friday |
Internal moves | Based on churn rate of 60% | Based on churn rate of 60% | Based on churn rate of 60% |
Security | 24-hour security | 24-hour security | 24-hour security |
Catering | Subsidised catering plus corporate entertaining | Subsidised catering plus corporate entertaining | Subsidised catering plus corporate entertaining |
Management | One resident facilities manager | One resident facilities manager and assistant | One resident facilities manager and two assistants |
25-year occupancy costs for 33 Old Broad Street compared with the 200,000 ft2 model | |||
200,000 ft2 model 拢 | OBS 拢 | Reason for differences in cost | |
M&E maintenance | 5,819,000 | 13,825,000 | High-tech uninterruptible power supply at Old Broad Street. Also significant plant for enormous atrium |
Lifts | 166,950 | 1,100,000 | |
Fabric | 2,630,000 | 1,000,000 | |
Finance | 34,280,464 | na | |
External land | 635,250 | na | |
Internal planting | 598,986 | 137,500 | |
Cleaning | 6,312,000 | 9,951,136 | Higher requirements from merchant banks 鈥 prestige clients demand high requirements |
Waste | 420,000 | 775,000 | |
Electricity | 11,929,800 | 13,800,000 | |
Gas | 929,250 | 300,000 | |
Water | 642,000 | 500,000 | |
Reception services | 1,275,120 | 1,325,000 | |
Communications | 5,417,341 | na | |
Postroom | 833,400 | 4,829,545 | Multi-tenancy buildings 鈥 therefore more postrooms |
Porterage | 1,087,600 | 1,590,909 | As above |
Internal moves | 25,536,000 | 6,676,136 | |
Security | 4,815,720 | 10,672,727 | Merchant banks are extremely security-conscious |
Catering | 5,114,063 | na | |
Management | 3,210,000 | 9,647,727 | Multi-tenancy buildings have greater management requirements |
Replacement | 7,670,912 | 7,659,032 | Same costs assumed. No information about Halifax available |
Total | 119,323,856 | 83,789,714 |
Detailed specification for 40,000 and 100,000 ft2 buildings | |
Foundations | Reinforced concrete foundations |
Ground-floor slabs | Reinforced concrete floor slabs. Power floated finish |
First, second and plant room floor slabs | Precast concrete planks with structural topping or insitu concrete on permanent formwork. First, second and plant room floor slabs give one-hour fire resistance |
Structure | Internal steel frame, generally on a 6 and 7.5 脳 6 m grid, supporting upper floors, roof framing and plant room floor slabs |
External walls | Cavity wall construction up to sill level. Outer skin of facing brickwork, inner skin of blockwork with rigid extruded polystyrene cavity insulation. Reconstructed stone to window sills and heads |
Windows and doors | Sealed unit double glazing with clear glass in polyester powder-coated aluminium frames |
Roof | Resin-bonded reconstituted slates on timber battens, insulation and timber trussed rafters. Polyester powder coated aluminium gutters and external downpipes |
Stairs | Reception stairs precast concrete with screeded landings. Balustrades in coated tubular steel, hardwood handrails |
Internal partitions | All partitions in concrete block |
Ceiling | Suspended ceiling system comprising 600 脳 600 mm mineral fibre ceiling tiles |
Internal joinery | Hardwood veneer, flush-lipped solid core doors. Polished aluminium ironmongery. Hardwood skirtings, sill boards, door linings and architraves |
Lifts | Electrically operated eight-person hydraulic lifts with stainless steel doors, surround and control panels |
Sanitary fittings | White vitreous WCs and wash basins |
Floor finishes | Medium-grade metal-faced full access flooring (250 mm overall floor zone) to office and corridor areas. Carpet finish high quality |
Wall finishes | Plaster finishes or plasterboard drylining with joints taped and filled to general areas. One mist and two full coats of emulsion |
Power | Wiring to and installing of three compartment floor boxes at a rate of 1 box/10 m2 net floor area and busbar power distribution system |
Lighting | Based on 1994 CIBSE Guide for Offices at 450 lux at 0.75 musing 600 脳 600 mm recessed modular fluorescent luminaries. The lighting scheme is based on open-plan offices |
Heating | Gas-fired boiler in each plant room provides low pressure hot water for heating |
Above-ground drainage | PVC soil vent waste pipework |
Ventilation | Air-conditioning of office area using a VAV system with fresh air supplied via ducted system |
WCs | A roof void mounted, packaged twin-fan extract unit |
Hot and cold water services | Hot water to basins provided by central storage heaters, other hot and cold water services as suitable |
Below-ground drainage | Flexible, jointed, vitrified clay or concrete pipework |
External works | Includes access road, plot road and parking aisles. Concrete block paviours to all roads. Bitumen macadam to car bays. Footpath in concrete block paviours. Full landscaping. External irrigation system. External car park lighting |
Detailed specification for 200,000 ft2 buildings | |
Foundations | Piled foundations and reinforced concrete ground beams, basement car park |
Ground-floor slabs | Reinforced concrete floor slabs. Power floated finish |
First, second and plant room floor slabs | Precast concrete planks with structural topping or insitu concrete on permanent formwork. First, second and plant room floor slabs give one-hour fire resistance |
Structure | Internal steel frame, generally on a 6 and 7.5 脳 6 m grid, supporting upper floors, roof framing and plant room floor slabs |
External walls | Reconstructed stonework panels with aluminium-framed curtain-walling system |
Windows and doors | Sealed unit double glazing with clear glass in polyester powder-coated aluminium frames |
Roof | Flat roof construction comprising single-ply membrane on insulation |
Stairs | Stairs precast concrete with screeded landings. Balustrades generally tubular stainless steel with hardwood handrails |
Internal partitions | All partitions in concrete blockwork to core areas |
Ceiling | Suspended ceiling system comprising 600 脳 600 mm metal ceiling tiles |
Internal joinery | Hardwood veneer, flush-lipped, solid core doors. Polished aluminium ironmongery. Hardwood skirtings, sill boards, door linings and architraves |
Lifts | Glazed feature lifts to main entrance area. Electrically operated eight-person hydraulic lifts with stainless steel doors |
Sanitary fittings | White vitreous WCs and hand basins |
Floor finishes | Medium-grade metal-faced full access flooring (250 mm overall floor zone) to office and corridor areas. Carpet finish high quality. Reception areas to comprise high-quality ceramic tile finish |
Wall finishes | Plaster finishes or plasterboard drylining with joints taped and filled to general areas. One mist and two full coats of emulsion |
Power | Wiring to and installing of three compartment floor boxes at a rate of 1 box/10 m2 net floor area and busbar power distribution system |
Lighting | Based on the 1994 CIBSE Guide for Offices at 450 lux at 0.75 m using 600 脳 600 mm recessed modular fluorescent luminaries |
Heating | Gas-fired boiler in each plant room provides low-pressure hot water for the heating |
Above-ground drainage | PVC soil vent waste pipework |
Ventilation | Air-conditioning of office area using a VAV system with fresh air supplied via ducted system |
WCs | A roof void mounted, packaged twin-fan extract unit |
Remaining specs as for 40,000 ft2 and 100,000 ft2 buildings |
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