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Keep up to dateCity office development Part L cost breakdown | |||
Ìý | element cost (or saving) | cost/m2 gfa £ | % of total cost |
Part L (2002) compliant scheme Construction cost of base scheme | 17,800,000 | 1,913.98 | Ìý |
Shell and core 9,300 m2 @ 1,640 | Ìý | Ìý | Ìý |
Category A fit out 6,375 m2 @ 400 | Ìý | Ìý | Ìý |
Ìý | Ìý | Ìý | Ìý |
Enhancements to scheme to comply with Part L 2005: Option 1 40% glazing | Ìý | Ìý | Ìý |
External walls, windows and doors | 81,400 | 8.75 | Ìý |
Extra over double glazed curtain walling; for solar-control glass; average U-value improvement from 2.2 to 2.0 1,300 m2 @ 40 | Ìý | Ìý | Ìý |
Extra over paint-backed glazed panels for improved insulation; average U-value improvement from 0.35 to 0.27 1,960 m2 @ 15 | Ìý | Ìý | Ìý |
Extra; increase airtightness to achieve 7 m3/hr/m2. No cost addition as standard is already achieved with unitised curtain wall 3,260 m2 @ nil | Ìý | Ìý | Ìý |
Heat source, space heating, air treatment and ventilation | (174,500) | (18.76) | Ìý |
Extra for; increased efficiency of condensing boilers to 89% 460kW @ 15 | Ìý | Ìý | Ìý |
Saving for; reduced boiler capacity and pipework sizes due to improved facade performance and heat recovery; reduction of 350 kW (350)kW @ 275 | Ìý | Ìý | Ìý |
Extra for: coefficient of performance for air cooled chillers increased to 3.1. No cost addition as chillers are typically specified to achieve this COP 806kW @ nil | Ìý | Ìý | Ìý |
Saving for; reduced chiller capacity and pipework sizes due to improved facade performance and heat recovery; reduction of 275 kW (275) kW @ 315 | Ìý | Ìý | Ìý |
Saving for; reduced power loads to mechanical plant, reduced sizing of sub-mains distribution Item @ (5,000) | Ìý | Ìý | Ìý |
Extra for; allowance for heat recovery installation to air handling plant; run-around coils Item @ 6,500 | Ìý | Ìý | Ìý |
Builders’ work in connection | 2,000 | 0.22 | Ìý |
Extra over costs of additional builders’ work in connection with heat recovery installation Item @ 2,000 | Ìý | Ìý | Ìý |
Preliminaries and contingencies | (18,900) | (2.03) | Ìý |
Contractor’s overheads, site establishment and site supervision Allow 17% Item @ (13,900) | Ìý | Ìý | Ìý |
Contingency sum Allow 5% Item @ (5,000) | Ìý | Ìý | Ìý |
Ìý | Ìý | Ìý | Ìý |
Construction cost – building only including costs of Part L compliance | 17,690,000 | 1,902.16 | Ìý |
Extra over costs of Part L compliance | (110,000) | (11.82) | (0.62) |
Ìý | Ìý | Ìý | Ìý |
Enhancements to scheme to comply with Part L 2005: Option 2 100% glazing, high performance glass, fixed louvres | Ìý | Ìý | Ìý |
External walls, windows and doors | 522,400 | 56.17 | Ìý |
Extra over double glazed curtain walling; high performance glass; average U-value improvement from 2.2 to 1.8 3,260 m2 @ 40 | Ìý | Ìý | Ìý |
Extra; increase air tightness to achieve 7m3/hr/m2. No cost addition as standard is already achieved with unitised curtain wall 3,260 m2 @ nil | Ìý | Ìý | Ìý |
Extra; fixed external shading 2,450 m2 @ 160 | Ìý | Ìý | Ìý |
Heat source, space heating, air treatment and ventilation | (57,800) | (6.22) | Ìý |
Extra for; increased efficiency of condensing boilers to 94% 470 kW @ 40 | Ìý | Ìý | Ìý |
Saving for; reduced boiler capacity and pipework sizes due to improved facade performance and heat recovery; reduction of 340 kW (340) kW @ 275 | Ìý | Ìý | Ìý |
Extra for: water cooled chillers in lieu of air cooled Item @ 10,000 | Ìý | Ìý | Ìý |
Saving for; reduced chiller capacity and pipework sizes due to improved facade performance and heat recovery; reduction of 340 kW (340) kW @ 315 | Ìý | Ìý | Ìý |
Extra for; distribution circuit to water cooled chiller; complete Item @ 100,000 | Ìý | Ìý | Ìý |
Saving for; reduced power loads to mechanical plant, reduced sizing of sub-mains distribution Item @ (5,000) | Ìý | Ìý | Ìý |
Extra for; allowance for heat recovery installation to air handling plant; thermal wheel Item @ 19,000 | Ìý | Ìý | Ìý |
Builders’ work in connection | 1,000 | 0.11 | Ìý |
Extra over costs of additional builders’ work in connection with heat recovery installation Item @ 1,000 | Ìý | Ìý | Ìý |
Preliminaries and contingencies | 104,400 | 11.23 | Ìý |
Contractor’s overheads, site establishment and site supervision Allow 17% Item @ 81,000 | Ìý | Ìý | Ìý |
Contingency sum Allow 5% Item @ 23,400 | Ìý | Ìý | Ìý |
Ìý | Ìý | Ìý | Ìý |
Construction cost – building only including costs of Part L compliance | 18,370,000 | 1,975.27 | Ìý |
Extra over costs of Part L compliance | 570,000 | 61.29 | 3.20 |
Ìý | Ìý | Ìý | Ìý |
Enhancements to scheme to comply with Part L 2005: Option 3 100% glazing | Ìý | Ìý | Ìý |
External walls, windows and doors | 735,000 | 79.03 | Ìý |
Extra over double glazed curtain walling; for low-e coating; average U-value improvement from 2.2 to 2.0; no additional cost as standard already achieved with curtain wall 3,260 m2 @ nil | Ìý | Ìý | Ìý |
Extra; increase air tightness to achieve 7m3/hr/m2. No cost addition as standard is already achieved with unitised curtain wall 3,260 m2 @ nil | Ìý | Ìý | Ìý |
Extra; motorised external shading 2,450 m2 @ 300 | Ìý | Ìý | Ìý |
Heat source, space heating, air treatment and ventilation | (57,800) | (6.22) | Ìý |
Scope of works and costs as breakdown for Option 2 | Ìý | Ìý | Ìý |
Electrical installations | 10,000 | 1.08 | Ìý |
Extra for; power supplies to motorised louvres 200 @ 50 | Ìý | Ìý | Ìý |
Special installations | 50,000 | 5.38 | Ìý |
Extra for; control wiring to motorised louvres 100 @ 500 | Ìý | Ìý | Ìý |
Builder’s work in connection | 4,000 | 0.43 | Ìý |
Extra over costs of additional builders’ work in connection with heat recovery installation and motorised louvres Item @ 4,000 | Ìý | Ìý | Ìý |
Preliminaries and contingencies | 158,800 | 17.08 | Ìý |
Contractor’s overheads, site establishment and site supervision Allow 17% Item @ 121,800 | Ìý | Ìý | Ìý |
Contingency sum Allow 5% Item @ 37,000 | Ìý | Ìý | Ìý |
Ìý | Ìý | Ìý | Ìý |
Construction cost – building only including costs of Part L compliance | 18,700,000 | 2,010.76 | Ìý |
Extra over costs of Part L Compliance | 900,000 | 96.78 | 5.06 |
Ìý | Ìý | Ìý | Ìý |
External walls, windows and doors | 551,300 | 59.28 | Ìý |
Extra; increase airtightness to achieve 7m3/hr/m2. No cost addition as standard is already achieved with unitised curtain wall 3,260 m2 @ nil | Ìý | Ìý | Ìý |
Extra over costs of; externally ventilated double wall facade with motorised blinds in lieu of standard unitised curtain wall; average U-value 1.60 2,450 m2 @ 225 | Ìý | Ìý | Ìý |
Heat source, space heating, air treatment and ventilation | (57,800) | (6.22) | Ìý |
Scope of works and costs as breakdown for Option 2 | Ìý | Ìý | Ìý |
Electrical installations | 10,000 | 1.08 | Ìý |
Extra for; power supplies to motorised louvres 200 @ 50 | Ìý | Ìý | Ìý |
Special installations | 50,000 | 5.38 | Ìý |
Extra for; control wiring to motorised louvres 100 @ 500 | Ìý | Ìý | Ìý |
Builders’ work in connection | 4,000 | 0.43 | Ìý |
Extra over costs of additional builders’ work in connection with heat recovery installation Item @ 4,000 | Ìý | Ìý | Ìý |
Preliminaries and contingencies | 122,500 | 13.17 | Ìý |
Contractor’s overheads, site establishment and site supervision Allow 17% Item @ 94,500 | Ìý | Ìý | Ìý |
Contingency sum Allow 5% Item @ 28,000 | Ìý | Ìý | Ìý |
Ìý | Ìý | Ìý | Ìý |
Construction cost – building only including costs of Part L compliance | 18,480,000 | 1,987.10 | Ìý |
Extra over costs of Part L compliance | 680,000 | 73.12 | 3.82 |
Key performance criteria to meet Part L standards | |||||
General design criteria | |||||
Occupancy | 8 m2/person | ||||
Outside air rate | 10 l/s/person | ||||
Small power load | 15 W/m2 | ||||
Ìý | |||||
Option design criteria | Base | Option 1 | Option 2 | Option 3 | Option 4 |
Ìý | scheme | 40% | 100% | 100 % | 100% |
Ìý | Part L | glazing | glazing, high | glazing, | glazing, |
Ìý | (2002) | solar | performance | motorised | double wall |
Ìý | compliant | control | glass, fixed | louvres | facade with |
Ìý | Ìý | glass | louvres | Ìý | motorised |
Ìý | Ìý | Ìý | Ìý | Ìý | louvres |
Ìý | |||||
Glass U-value (W/m2K) | 2.20 | 2.00 | 1.80 | 2.00 | 1.60 |
Cladding U-value (W/m2K) | 0.35 | 0.27 | Ìý | Ìý | Ìý |
Heating load (kW) | 810 | 460 | 470 | 470 | 470 |
Cooling load (kW) | 1,080 | 806 | 740 | 740 | 740 |
Power (kW) | 770 | 550 | 470 | 470 | 470 |
Solar heat gain | 52% | 42% | 18% | 18% | 18% |
Lighting load (w/m2) | 13 | 12 | 12 | 12 | 12 |
Heat recovery; | Ìý | Ìý | Ìý | Ìý | Ìý |
run-around coils | Ìý | 50% | Ìý | Ìý | Ìý |
Heat recovery; thermal wheel | Ìý | Ìý | 70% | 70% | 70% |
Airtightness @ 50 Pa, | Ìý | Ìý | Ìý | Ìý | Ìý |
m3/hr/m2 | 10 | 7 | 7 | 7 | 7 |
Boiler efficiency | 80.8% | 89% | 94% | 94% | 94% |
Air cooled chiller | Ìý | Ìý | Ìý | Ìý | Ìý |
coefficient of performance | 2.25 | 3.1 | Ìý | Ìý | Ìý |
Water cooled chiller | Ìý | Ìý | Ìý | Ìý | Ìý |
coefficient of performance | Ìý | Ìý | 4.0 | 4.0 | 4.0 |
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