Trusted gas services in London

Who may legally do this work

All gas businesses and their engineers must be on the Gas Safe Register to carry out gas work legally in the United Kingdom, Isle of Man, Jersey and Guernsey. Gas Safe Register is the only official gas registration body of gas businesses and engineers in the United Kingdom. It replaced CORGI as the HSE-appointed body in 2009. Engineers are only registered for specific categories of gas work (e.g. boilers, cookers, fires) shown on their Gas Safe ID card, so being registered for one appliance type does not mean an engineer is qualified for all gas work.

Source — checked 21 July 2026

Certificates & records

• Landlord Gas Safety Record (LGSR, often called 'CP12' in the industry, though that is not the certificate's legal name)

  Who must hold it:

  Landlords of any property with gas appliances that they supply to tenants

  Frequency:

  Annual — within 12 months of appliance/flue installation and at intervals of not more than 12 months thereafter. Gas Safe Register notes a check can be carried out any time from 10-12 months after the last completed check without affecting the original expiry date; checks done earlier than 10 months or later than 12 months reset the deadline to 12 months from the new check date.

  Following the annual gas safety check, the landlord is given a Landlord Gas Safety Record (LGSR) with details of all checks carried out, which must be retained for 2 years and provided to tenants as described above.

  Source — checked 21 July 2026

• Building Regulations Compliance Certificate for gas work

  Who must hold it:

  Any homeowner or landlord who has had notifiable gas work (e.g. a new boiler) installed

  Frequency:

  One-off, issued after the work; not a recurring certificate

  This is a different document from the Gas Safety Record: it confirms new gas work meets Building Regulations, and is often needed when selling a property. Gas Safe Register itself issues replacement copies of this certificate.

  Source — checked 21 July 2026

Commonly misunderstood

• Myth vs fact

  Myth: Many assume any Gas Safe registered engineer can do any gas job.

  Fact: Registration is appliance/work-category specific — an engineer's Gas Safe ID card lists exactly which types of gas work (e.g. boilers, cookers, gas fires) they are registered for. A consumer should check the ID card or the online register entry covers the specific appliance being worked on, not just that the person is 'Gas Safe registered' in general.

  Source — checked 21 July 2026

• Myth vs fact

  Myth: Some landlords believe a tenant refusing access removes the legal obligation to carry out the gas safety check.

  Fact: Gas Safe Register's own landlord guidance states that if a tenant refuses access, the landlord 'must show you've taken all "reasonable steps" to comply with the law' — including repeated attempts and written correspondence — and that the regulations 'don't give powers to force disconnection of the gas supply in these circumstances,' so landlords may need legal advice rather than assuming the duty simply lapses.

  Source — checked 21 July 2026

Penalties for non-compliance

• HSE guidance to landlords states plainly of non-compliance: 'You are putting lives at risk and breaking the law. HSE gives gas safety a high priority and will take the appropriate action to ensure compliance with the regulations; this could result in a substantial fine and/or a custodial sentence.'

  Source — checked 21 July 2026

• Breach of the Health and Safety at Work etc Act 1974 (which underpins enforcement of GSIUR) can lead to prosecution under section 33. For an offence under section 33(1)(a) relating to sections 2-6 duties, Schedule 3A sets the maximum penalty on summary conviction (magistrates' court) as imprisonment for a term not exceeding 12 months or a fine not exceeding £20,000, or both; on conviction on indictment (Crown Court) as imprisonment for a term not exceeding two years, or a fine (unlimited), or both. This is the general HSWA penalty structure that gas safety enforcement sits within — the exact penalty class applicable to a specific GSIUR regulation was not independently confirmed against Schedule 3A for every regulation.

  Source — checked 21 July 2026

How to check who’s legally allowed to do this

A consumer can find and check a gas engineer by searching postcode or town/city on the Gas Safe Register website, filtering by domestic or commercial fuel type. Every registered engineer carries a Gas Safe ID card showing what gas work they are legally permitted to carry out. Gas Safe Register also investigates reports of illegal gas work and unsafe/unregistered engineers.

gassaferegister.co.uk

Source — checked 21 July 2026