Gaseous fire suppression systems | Archive Titles

Table 1: Indicative costs of sprinkler installations to commercial offices
Shell and core – rate based on gross internal floor area	Ordinary hazard group 1 £/m²	Ordinary hazard group 3 £/m²
Main plant and risers; incoming mains, storage tank (75 m³), pumps, valves, riser pipework; floor valve sets	3-4	n/a
Extra over for sprinkler distribution and heads to landlords’ areas (£/m² affected area)	12-15	n/a
Extra over for sprinkler distribution and heads to car park (£/m² affected area)	n/a	7.5-10
Fit-out costs – rate based on net internal area
Category A fit-out installation to office areas; high level distribution, based on one head per 9 m²	13-14	n/a
Extra over Category A fit-out cost for alternate system; valves, compressor etc (extra over cost based on floor plate of 1000 m², with single valve set)	3-4	n/a
Extra over Category A fit-out cost for pre-action system; valves, interface to alarm system etc (extra over cost based on floor plate of 1000 m², with single valve set)	5-6	n/a
Category B fit-out cost for mist system; removal of Category A installation, cylinders and valves, etc (cost based on affected area of 300 m², with single valve set, costs of works to ceiling tiles etc excluded)	105-115	n/a
Note 1. The tank sizing is dependent upon the specific requirements of the project 2. The extra-over costs of alternate and pre-action options exclude the costs of the interconnecting pipework between the affected area and the valve set located in the riser.