Gas safety renewal calculator
A gas safety check must be carried out every 12 months, and a check carried out in the final 2 months before the deadline is treated as carried out on the deadline date, which preserves the anniversary.
| Last check | Window opens | Renewal deadline |
|---|---|---|
| 1 January 2026 | 1 November 2026 | 1 January 2027 |
| 1 February 2026 | 1 December 2026 | 1 February 2027 |
| 1 March 2026 | 1 January 2027 | 1 March 2027 |
| 1 April 2026 | 1 February 2027 | 1 April 2027 |
| 1 May 2026 | 1 March 2027 | 1 May 2027 |
| 1 June 2026 | 1 April 2027 | 1 June 2027 |
| 1 July 2026 | 1 May 2027 | 1 July 2027 |
| 1 August 2026 | 1 June 2027 | 1 August 2027 |
| 1 September 2026 | 1 July 2027 | 1 September 2027 |
| 1 October 2026 | 1 August 2027 | 1 October 2027 |
| 1 November 2026 | 1 September 2027 | 1 November 2027 |
| 1 December 2026 | 1 October 2027 | 1 December 2027 |
LLCR
LLCR is a private compliance register for landlords and letting agents in England. It keeps every certificate, deadline, notice and proof of service for each property in one tamper-evident record, so the evidence exists in order when a tenant, a council or a court asks for it. It is not a government service and is separate from the Private Rented Sector Database and any other statutory register.
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How this is calculated
The renewal deadline is 12 months from the date of the last check, landing on the anniversary. Regulation 36(3)(a) requires a check at intervals of not more than 12 months, so a date past the anniversary sits outside the interval.
Where the anniversary does not exist in the target month, the deadline falls on the last day of that month. A check on 29 February has its deadline on 28 February the following year, because rolling forward to 1 March would put it past the 12 month interval.
The early renewal window opens 2 months before the deadline, measured back from the deadline itself. Regulation 36A(1) defines the window as ending with the deadline date, and a check completed inside it is treated as made on the deadline date, which is what preserves the anniversary.
The result also states where today falls: before the window opens, inside the window, or past the deadline. Days remaining counts whole calendar days to the deadline, and a negative figure means the deadline has passed.
Worked example
Take a last check carried out on 15 March 2026.
- The deadline is 12 months on, which is 15 March 2027.
- The window opens 2 months before that deadline, on 15 January 2027.
- A check completed on any day from 15 January 2027 to 15 March 2027 is treated by regulation 36A(1) as made on 15 March 2027, so the next deadline becomes 15 March 2028.
- A check completed before 15 January 2027 is treated as made on its actual date, and the following deadline runs 12 months from that earlier date instead.
Based on the date entered, the deadline is 15 March 2027 and the window that preserves the anniversary runs from 15 January 2027. Checking within the window keeps the renewal date fixed year on year rather than creeping earlier with each early check.
Frequently asked questions
What happens if the check is done before the renewal window opens?
It still counts as a valid check, but it is treated as made on its actual date rather than the deadline date. The next 12 month interval then runs from that actual date, so the renewal date moves earlier. Only a check completed within the 2 months ending with the deadline date is treated by regulation 36A(1) as made on the deadline date.
What records must be kept to rely on regulation 36A?
Regulation 36(3)(c) requires a record of each safety check, including the date the check was carried out, the appliance or flue checked, any defect found, the remedial action taken and the engineer's registration details. The record is retained until there have been two further checks of that appliance or flue. The dates on successive records are what evidence that a check fell inside the window, since regulation 36A turns entirely on dates.
What if the anniversary date does not exist in the following year?
The deadline falls on the last day of the month instead. On a 12 month cycle the only date this affects is 29 February: a check made on 29 February is due again by 28 February of the following year, because rolling forward to 1 March would put the check outside the interval regulation 36(3)(a) allows. The renewal window still opens 2 months before that adjusted deadline.
Does a new tenancy change the renewal date?
No. The check cycle attaches to the appliance and the flue, not to the tenancy. What regulation 36(3)(b) requires for a new lease is that each appliance and flue has been checked within the 12 months before the lease commences, or within 12 months of installation for newly installed equipment. An in date check carries over, and the renewal date stays where the last check put it.
Statutory source
The check interval is regulation 36(3)(a) of the Gas Safety (Installation and Use) Regulations 1998: each appliance and flue checked within 12 months of installation and at intervals of not more than 12 months since the last check. Regulation 36A(1), inserted by the Gas Safety (Installation and Use) (Amendment) Regulations 2018, treats a check completed in the 2 months ending with the deadline date as made on the deadline date, and regulation 36A(4) defines the deadline date as the last day of the 12 month period. Regulation 36(3)(c) requires a record of each check, retained until there have been two further checks.
Last reviewed 21 August 2026.
This tool provides general information based on legislation applying to England. It is not legal advice and does not account for every circumstance. Figures should be confirmed against the current legislation or with a qualified adviser before being relied on.
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