Costs of water automatic sprinkler systems
This article was originally published as part of The impact of automatic sprinklers on building design, an independent report produced by WSP, sponsored by the Business Sprinkler Alliance (BSA), published in September 2017.
An approximate estimate of installing automatic sprinkler systems to establish viability is given as follows:
- Sprinkler infrastructure: equipment installation, pipework, valve sets, booster pumps and water storage = £60,000 - £80,000
- Price per sprinkler head; including pipework valves and supports = £180 per head
Whilst the infrastructure cost (£60,000-£80,000) does vary depending on the building size, it only does so in a minor fashion due to fact that automatic sprinklers are designed to operate a fixed number of heads independent of floor area. Therefore as the building grows in size, the cost associated with the infrastructure does not vary significantly. This means that the cost efficiency of automatic sprinklers generally increases with building size.
The number of sprinkler heads required varies depending principally on the type of risk to be protected (i.e. category of building type) and layout. For most building types, automatic sprinklers are orientated on a 4m x 3m ceiling grid which gives 1 sprinkler head per 12m2 but as noted above, that is an ideal situation and further heads will be required to suit internal partitions and different building footprints. Therefore 15% has been added to the above figure to give a £/m2:
- £180 per head;
- 3m x 4m coverage from a single head;
- 15% layout allowance.
- Total = £17.25/m2 GIA [note 6] + Sprinkler infrastructure (£70,000)
Other factors may influence the area of coverage such as whether a building has deep ceiling voids which may need protection or sterile areas such as stairs and toilets that may not.
For a comparison the rates shown in Table 5-1 are “Shell and Core” costs for installing automatic sprinkler systems (including the water supply) for Offices with GIA between 3,000 – 15,000 m2 and hotels (2 to 5 stars). These rates highlight the variability in costs between building types.
[Table 5-1: Generic pricing – sprinkler system installation]
Building use | Installed as part of building shell Rate /m2 | Installed as part of building fit-out Rate /m2 |
Office – central London | £16.37 | £21.21 |
Office – regional (average) | £14.73 | £19.08 |
Warehouse ( fitted racking installed) | £42.32 | n/a |
Hotels (2 – 5*) | £20 – 30 | n/a |
To ensure these generic rates shown above (Table 5-1) are reasonable, specific cases of cost analyses provided by Spon’s price book (shown in Table 5-2) are reviewed;
- Installing a sprinkler system in the office building example shown in Table 5-2 costs £316k and averages to £16.37/m2 GIA. This rate is within the generic ranges quoted earlier (i.e. £17.25/m2 + £70k and £15-20/m2).
- In another example, the costs of providing automatic sprinkler system and dry risers to a 4* hotel were £596k and averaging to £36.12/m2. In order to compare this figure (£36.12/m2) with £20-30/m2 from Table 5-1 the cost of dry risers has to be discounted leaving the rate as £26.12/m2. This rate £26.12/m2 falls almost in the middle of the generic price range shown in Table 5-1 and confidence can be placed in the values presented.
These examples demonstrate that the actual cost of installing automatic sprinkler system for each building depends on many factors, however the rates quoted in Table 5-1 can be used as a guide for estimating costs based on GIA.
[Table 5-2: Real examples of installing sprinkler system costs in different types of buildings]
Cost / m2 GIA
Office building located in Central London, 15 floors, GIA = 19,300 m2
£316,000
£16.37/m2
4* Hotel, 200 bedrooms, located in Central London, 10 floors, GIA = 16,500 m2
(inc. dry risers) = £596,000
(inc. dry risers) =
£36.12/m2
Airport terminal building located in the South East, GIA= 25,000 m2
£790,000
£31.60/m2
Shopping mall located in the South East comprised;
Two storey retail area, GIA = 33,000 m2
£415,000
£12.57/m2
Covered car park, GIA = 13,000 m2
£270,000
£20.76/m2
Distribution centre (Warehouse), located in outer London, GIA = 75,000 m2 (inc. refrigerator area GIA=17,500m2)
(inc. racking protection)= £3,174,000
£42.32/m2
[edit] Notes
[6] Gross Internal Area that includes; all areas occupied by internal walls and open-sided covered areas, but excludes; open balconies, open fire escapes, and open-sided covered ways. It is the total floor area of all storeys, not the building footprint area.
Read more: The impact of automatic sprinklers on building design.
[edit] Related articles on Designing Buildings
- Automatic fire sprinkler.
- Automatic fire sprinkler systems: A good practice guide.
- Automatic sprinkler system design and operation.
- Business Sprinkler Alliance.
- Case study A for offices to show where automatic sprinklers have the greatest impact.
- Case study B for offices to show where automatic sprinklers have the greatest impact.
- Design benefits of automatic sprinkler systems granted under approved document B.
- Drenchers.
- Fire detection and alarm system.
- Fire detector.
- Fire in buildings.
- Fire protection engineering.
- Fire safety design.
- Making the case for sprinklers and dispelling myths.
- Overview of automatic sprinkler system design and operation.
- Sprinkler head.
- Sprinkler systems explained: A guide to sprinkler installation standards and rules.
- Sprinklers.
- The cost efficiency of different combinations of fire protection measures.
- The impact of automatic sprinklers on building design.
- Watermist systems for fire protection in domestic and residential buildings DG 534.
Featured articles and news
RTPI leader to become new CIOB Chief Executive Officer
Dr Victoria Hills MRTPI, FICE to take over after Caroline Gumble’s departure.
Social and affordable housing, a long term plan for delivery
The “Delivering a Decade of Renewal for Social and Affordable Housing” strategy sets out future path.
A change to adoptive architecture
Effects of global weather warming on architectural detailing, material choice and human interaction.
The proposed publicly owned and backed subsidiary of Homes England, to facilitate new homes.
How big is the problem and what can we do to mitigate the effects?
Overheating guidance and tools for building designers
A number of cool guides to help with the heat.
The UK's Modern Industrial Strategy: A 10 year plan
Previous consultation criticism, current key elements and general support with some persisting reservations.
Building Safety Regulator reforms
New roles, new staff and a new fast track service pave the way for a single construction regulator.
Architectural Technologist CPDs and Communications
CIAT CPD… and how you can do it!
Cooling centres and cool spaces
Managing extreme heat in cities by directing the public to places for heat stress relief and water sources.
Winter gardens: A brief history and warm variations
Extending the season with glass in different forms and terms.
Restoring Great Yarmouth's Winter Gardens
Transforming one of the least sustainable constructions imaginable.
Construction Skills Mission Board launch sector drive
Newly formed government and industry collaboration set strategy for recruiting an additional 100,000 construction workers a year.
New Architects Code comes into effect in September 2025
ARB Architects Code of Conduct and Practice available with ongoing consultation regarding guidance.
Welsh Skills Body (Medr) launches ambitious plan
The new skills body brings together funding and regulation of tertiary education and research for the devolved nation.
Paul Gandy FCIOB announced as next CIOB President
Former Tilbury Douglas CEO takes helm.
UK Infrastructure: A 10 Year Strategy. In brief with reactions
With the National Infrastructure and Service Transformation Authority (NISTA).