HHSRS Hazard 27 - Explosions

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If a tenant reports a property to the Council for a HHSRS Hazard 27 - Explosions issue, the Council is legally obligated to inspect the property for all 29 hazards outlined in the Housing Health & Safety Rating System (HHSRS).

If the Council uncovers any Category 1 risks, it is obliged by law to take action against the landlord and any associated agents. This is not just a formality; it is a serious obligation that must be addressed.

Hazard 27 - Explosions

This hazard covers the threat from the blast of an explosion, from debris generated by the blast, and from the partial or total collapse of a building as the result of an explosion.

A study for the Building Research Establishment (BRE) between 1985 and 1991 showed that the most frequent causes of explosions were mains gas (42%) and stored gas (17%). Water vapour explosions accounted for 5%, and fire for 4%, of the total recorded explosions.

The most likely causes are defective installation or design, and defects from inadequate maintenance.

Vulnerable Group: All ages

Defects & Justifications

Unauthorised gas supply - the supply of gas from a non-authorised supplier.
Siting of gas tanks - inappropriate siting of LPG containers or tanks.
Gas installations - defects to the gas installation (pressure regulators, meters and pipework).
Gas appliances - defects to the gas appliances.
Maintenance defects - lack of evidence of regular testing and servicing of the gas installation and/or appliances.
Ventilation - lack of appropriate means of ventilation, taking account of the type of gas used.
Gas storage - inadequate or defective storage equipment for other than mains gas.
Hot water storage tank - tank of greater than 3 gallons (15 litres) connected directly to the mains water supply.
Vented hot water system - inadequately sized and/or blocked vent to system.
Unvented hot water system - lack of or defective non self-resetting thermal cut-out and/or temperature relief valve to unvented system.

Index of HHSRS Hazards

Rectifying the HHSRS Hazard 27 - Explosions: Guidance Checklist

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How can I reduce the risk of explosions from gas appliances?

Ensure all gas appliances are serviced annually by a Gas Safe registered engineer. Regular maintenance helps detect leaks and prevent dangerous pressure build-ups.

What should I do if I smell gas in a property?

Immediately shut off the gas supply at the mains, open windows, evacuate the building, and call the National Gas Emergency Service. Do not use electrical switches or naked flames.

Are old gas pipe installations a risk for explosion?

Yes, outdated or corroded gas piping should be replaced. Arrange for an inspection and upgrade where necessary using approved materials and qualified professionals.

How do I make sure fuel storage areas are safe?

Keep fuel storage well-ventilated, away from ignition sources, and secure from tampering. Regularly check for leaks and use proper containment systems.

Can electrical faults cause explosions?

Yes, especially near flammable materials. Install circuit breakers, avoid overloading sockets, and ensure wiring complies with modern standards to minimise risk.