How long does a gas safety certificate last, and how long must you keep it?

In England, Wales and Scotland, the landlord rule is a 12-month gas safety check cycle, with separate record-keeping rules that are often misstated. Northern Ireland keeps the same 12-month check interval but differs on early checks and how long records must be kept.

How long does a gas safety certificate last?

A landlord gas safety check must be done at intervals of not more than 12 months in England, Wales, Scotland and Northern Ireland, although the law sets the interval between checks rather than giving a “gas safety certificate” or “CP12” a legal lifespan. For England, Wales and Scotland, regulation 36 requires the landlord to “ensure that each appliance and flue” is checked “at intervals of not more than 12 months since it was last checked for safety”; Northern Ireland’s equivalent rule says “at intervals of not more than twelve months since it was last checked for safety”. In everyday letting language, a gas certificate on a rental property is treated as lasting 12 months, so landlords do need a gas safety certificate every year in practical terms. Abodient can hold the gas safety certificate against the property, record its expiry, and show what is overdue across a portfolio, which matters because the legal duty turns on the next check date, not the label on the document.

How far in advance can a gas safety check be done?

In England, Wales and Scotland, a landlord can do the annual gas safety check up to 2 calendar months before the deadline date without bringing the renewal date forward; if the check is done earlier than that, the annual cycle moves to the earlier check date. Regulation 36A says that where the check is completed “within the period of 2 months ending with the deadline date”, it is treated as having been made on the deadline date, so the commonly quoted “10–12 weeks” window is too loose: the statutory preservation window is 2 months, not 10–12 weeks. The separate Northern Ireland regulations keep the 12-month check interval but do not contain the same early-check preservation rule, so a Northern Ireland landlord should work from the last check date rather than relying on the England, Wales and Scotland anniversary-saving rule.

How long do landlords have to keep gas safety certificates?

No rule requires keeping gas safety records for two years in England, Wales and Scotland: landlords must keep each gas safety record until two further checks of that appliance or flue have been carried out, and the 2-year rule applies only where the appliance or flue has been removed from the premises. The statute says the record must be retained “until there have been two further checks of the appliance or flue” or, for a removed appliance or flue, “for a period of 2 years from the date of the last check”. HSE’s own landlord leaflet makes the same point in plainer language: “keep the record of the gas safety check until two further checks have been carried out (this may be longer than two years)”. Northern Ireland is different: its regulation 36 still requires the record to be retained “for a period of two years from the date of that check”.

Last reviewed August 2026.

Sources

• Gas Safety (Installation and Use) Regulations 1998 reg. 36(3)(a) — “(a)ensure that each appliance and flue to which that duty extends is checked for safety within 12 months of being installed and at intervals of not more than 12 months since it was last checked for safety (whether such check was made pursuant to these Regulations or not; and see regulation 36A); and” Source
• Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004 reg. 36(3)(a) — “(a)ensure that each appliance and flue to which that duty extends is checked for safety within twelve months of being installed and at intervals of not more than twelve months since it was last checked for safety (whether such check was made pursuant to these Regulations or not);” Source
• LetSorted gas safety certificate guidance — “A gas safety certificate (CP12) is valid for 12 months from the date of the inspection.” Source
• Gas Safety (Installation and Use) Regulations 1998 reg. 36A(1) — “36A.—(1) Where a safety check of an appliance or a flue made in accordance with regulation 36(3)(a) or (b) is or was completed within the period of 2 months ending with the deadline date, that check is to be treated for the purposes of regulation 36(3)(a) and (b) as having been made on the deadline date.” Source
• LetSorted early gas safety check guidance — “If you arrange your gas safety check within the last 10-12 weeks before your current certificate expires, the new certificate's validity runs from the old certificate's expiry date, not the date of the new check.” Source
• Gas Safety (Installation and Use) Regulations 1998 reg. 36(3)(c) — “(c)ensure that a record in respect of any appliance or flue so checked is made and retained until there have been two further checks of the appliance or flue under this paragraph or, in respect of an appliance or flue that is removed from the premises, for a period of 2 years from the date of the last check of that appliance or flue, which record shall include the following information—” Source
• Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004 reg. 36(3)(c) — “(c)ensure that a record in respect of any appliance or flue so checked is made and retained for a period of two years from the date of that check, which record shall include the following information –” Source
• HSE INDG285 gas safety leaflet — “keep the record of the gas safety check until two further checks have been carried out (this may be longer than two years);” Source