Whole-life costs: Office design | Features

Base building, air-conditioned office
Basic information
Gross internal floor area	12,000 m²
Construction	Steel frame of 44 kg/m²
Substructure	200 mm ground-bearing slab
Roof	Pitched, “Sarna” single membrane proprietary roofing system with parapets
External walls	Mostly reconstituted stone wall cladding with 20% is polyester powder coated aluminium curtain-walling, fully glazed to clear height with double-glazed low-emissivity glass
Window frames	Aluminium
Windows	Double-glazed, low-emissivity glass; non-opening
Air-conditioning	fan-coil units
Lifts	Four passenger and two goods
Capital costs (£) (excluding fees)
Substructure	652,246
Structure	1,884,274
External envelope	2,212,538
Internal divisions	549,591
Finishings and fittings	2,450,866
Mechanical	3,503,101
Electrical and communications	£1,701,463
Lifts	855,581
Preliminaries, overheads and profit	1,554,701
Total	17,343,000
Net present costs for energy consumption (£)
Space heating	3,779
Cooling and fans	20,753
Lighting	22,000
Other energy costs	42,850
Total (over 30-year period)	89,385
Net present costs (£) of maintenance and replacement over 30 years
(limited to just the main elements that are changed)
Roof edge and parapet gutter	3,393
Wall cladding	26,840
Curtain walling	56,673
Windows and brise soleil	168,352
Heat source	287,371
Air-conditioning	1,292,772
Ventilation	728,460
Stand-by generator	143,990
Light fittings	365,504
Total	2,993,912
Net present cost for base building
(does not include soft FM items such as cleaning and rates)
TOTAL	20,426,297