BS9251:2014 The British Standard for Fire Sprinklers

BS9251 is the British Standard. This is the 2nd version of this standard, originally published in 2005 then reviewed and amended in 2014 with help from members of the fire service and players in the industry.

BS9251 covers:

  • Individual dwellings (houses, flats and maisonettes)
  • Houses of multiple occupancy (HMOs)
  • Bed and breakfast accommodation
  • Boarding houses
  • Blocks of flats
  • Residential care premises
  • Dormitories
  • Hostels

The standard does not cover schools, hospitals, hotels or commercial buildings. Any sprinkler systems for commercial properties are covered by BS12845:2015 The British Standard

The types of property covered vary on size and type of resident and therefore are split into risk categories. These categories range from 1-3.

Category 1 covers individual dwellings to small blocks of flats (less than 18M high).

Category 2 covers large blocks of flats (over 18M high) and small residential care homes (10 residents or less).

Category 3 covers large residential care homes (more than 10 residents) to hostels.

Also see for the latest news

Each category has minimum design parameters which determine the number of heads that should be used to calculate the amount of water and pressure required to run the system. The total number of heads required in any system is dependent on the room sizes, use and area covered by an individual head. Typically, 1 head can cover 25m2 but should not be more than 2.75m from a wall and no closer than 2.4m from another sprinkler head.

Category 1 systems require a minimum run time of 10 minutes and the calculation should include 1 or 2 heads in the calculation.

Category 2 systems require a minimum run time of 30 minutes and the calculation should include 1 or 2 heads in the calculation.

Category 3 systems require a minimum run time of 30 minutes and the calculation should include 2 or 4 heads in the calculation.

Sprinklers Direct will design and hydraulically calculate the system to find the required system demand and delivery method.

Case Study

8 Flats in Croydon, Surrey

Client: 8 Flats in Croydon, Surrey

Risk Category: Cat 1, 2 head, 10 minutes
Number of heads: 44
System Type: Boosted Mains fed

This project was for an extension on an existing building to include 8 more flats. The existing building had sprinkler to all flats fed from the boosted mains water supply.

We surveyed the property prior to quotation to check the existing system supplies and location. The existing pipework was capped at the end of a corridor with a valve which...


News Articles

24 - 03 - 2020

Installation and Maintenance of Fire Sprinklers Whilst Limiting the Spread of Coronavirus (COVID-19)

Fire Sprinklers in a World with COVID 19 In a World with COVID 19 fire safety remains important. Installation, servicing, maintenance and testing of fire...


14 - 10 - 2019

Why Install a Fire Sprinkler?

Sprinklers Protect Buildings In the event of a fire a fire sprinklers will minimise the damage to a property. Sprinkler heads activate individually. Fire sprinkler...


27 - 09 - 2019

Proud Sponsors of the ‘Pass and Move’ U9’s competing in the East Sussex league

Deal secured! It went down to the wire with a few last minute wrangling’s but Sprinklers Direct Ltd won the coveted Annual sponsorship for the...


09 - 09 - 2019

New Fire Sprinkler Regulations – In Consultation

New fire sprinkler regulations are being considered under government plans to improve fire safety regulations recently outlined by Housing Secretary Robert Jenrick. Consultation on improved...

Sprinklers Direct Limited,

Units 2 & 3 Millbank House,
Riverside Business Park,

This website uses Cookies to improve your browsing experience. View Cookies Policy

I'm fine with this