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Capital costs for the options 
Option 1 Option 2 Option 3
Flooring installation 415 548.00 592 639.75 587 698.78
Power installation 322 247.94 147 243.74 146 666.41
IT installation 140 323.67 147 580.41 147 580.41
Saving for reducing building height by 900 mm –135 000.00 n/a n/a
Sub-total 743 119.62 87 463.90 881 945.60
Testing and commissioning 11 146.79 13 311.96 13 229.18
Subcontractor’s preliminaries 44 587.18 53 247.83 52 916.74
Sub-total 798 853.59 954 023.70 948 091.52
Main contractor’s preliminaries,
overheads, profit and attendance		 139 799.38 166 954.15 165 916.02
Builder’s work in connection 39 942.68 47 701.18 47 404.58
Allocation of professional fees 95 862.43 114 482.84 113 770.98
Total capital cost 1 074 458.07 1 283 161.87 1 275 183.10
 
The options in detail
Option 1 Option 2 Option 3
Floor
treatment		 75 mm screed on slab; commercial-quality carpet
tiles with 10-year guarantee		 Application of sealer to floor slab; 150 mm
standard raised access floor screwed at corners;
cut-outs for rectangular floor outlet boxes;
commercial-quality carpet tiles with 10-year
guarantee		 Application of sealer to floor slab; 150 mm
standard raised access floor screwed at corners;
circular cut-outs for 125 mm diameter high-impact
plastic floor grommets; commercial-quality carpet
tiles with 10-year guarantee
Power installation Three-compartment skirting trunking to building
perimeter and to walls of cellular space to maintain
ability to service desk or lecture positions;
single-core low smoke and fume wiring to twin
switched 13 A double socket outlets mounted in
skirting trunking		 Underfloor power installation comprising 63 A
single phase busbar with tap-off outlets at 300 mm
centres, fed via low smoke and fume steel
wire-armoured two-core cables; Tap-off units and
3 m fly leads to feed twin-switched 13 A double
socket outlets mounted in three-compartment
recessed floor boxes		 Underfloor power installation comprising 63 A
single phase busbar with tap-off outlets at 300
mm centres, fed via low smoke and fume steel
wire-armoured two-core cables; tap-off units and
5 m fly lead to feed four gang switched 13 A
socket outlet module (fixing to final desk position
is optional)
Data and voice communications installation Structured wiring system comprising a four-core
fibre-optic backbone between on-floor
communications cabinets and the main
communications cabinet in the basement.
Twenty-four-way patch panels at each floor level
with Category 5E cable hard-wired direct to RJ45
outlets mounted in skirting trunking. Media
adapters for converting a standard RJ45 outlet into
a voice communications outlet. Data cabling is run
in one compartment of the skirting trunking		 Structured wiring system comprising a four-core
fibre-optic backbone between on-floor
communications cabinets and the main
communications cabinet in the basement.
Twenty-four-way patch panels at each floor level
with Category 5E cable wired to eight-port
sub-floor boxes mounted direct to slab; plug in fly
lead connections from sub-floor boxes to four-way
RJ45 outlet plates mounted in the three-
compartment floor box. Media adapters for
converting a standard RJ45 outlet into a voice
communications outlet. Data cabling is bundled,
tied and laid loose on the slab under the raised
floor		 Structured wiring system comprising a four-core
fibre-optic backbone between on-floor
communications cabinets and the main
communications cabinet in the basement.
Twenty-four-way patch panels at each floor
level with Category 5E cable wired to eight port sub-
floor boxes mounted direct to slab; plug-in fly lead
connections from sub-floor boxes to four-way
RJ45 outlet module (fixing to final desk position is
optional). Media adapters for converting a
standard RJ45 outlet into a voice communications
outlet. Data cabling is bundled, tied and laid loose
on the slab under the raised floor
Life expectancy of elements
Element Years
Carpet tiles 10*
150 mm raised floor 25
Skirting trunking 10-12
Socket outlets (skirting trunking) 10-15
Power wiring (skirting trunking) 25
RJ45 outlets(skirting trunking) 10-15
63 A underfloor busbar and components 25
Tap-off unit and flying lead; 3 m 10-15
Low smoke and fume, steel-wire armoured
cables and terminations		 25
Floor boxes 10-15
Floor grommets 25
Twin-socket outlets (floor boxes) 10-15
Four-way RJ45 outlets (floor boxes) 10-15
Four-way fused socket outlet (floor grommets) 10-15
Four-way RJ45 outlet (floor grommets) 10-15
IT wiring 20*
* Based on manufacturer’s guarantee