The short answer: a C-rated EPC obtained before 1 October 2029 counts as meeting the 2030 standard until that certificate expires. EPCs last ten years, so a C lodged in 2026 covers you to 2036, whatever the new rating method says. That sentence is in the government's January 2026 response and it's the most useful thing in the whole policy. Three catches decide whether it helps you.
Catch 1: when your certificate expires
If your C expires before October 2030, or soon after, you'll need a new EPC, and a new EPC is assessed under whatever method applies on the day. New-format certificates are expected from the second half of 2027. After that, a fresh assessment is on the new metrics, and today's single C rating no longer exists to lock in. So the legal cut-off is October 2029, but the practical window to get a C under today's method may close in 2027. Check the expiry date on your certificate first; it's the date that matters most.
Catch 2: how the C was earned
The new standard is a C on Fabric Performance, plus a C on either Heating System or Smart Readiness. The government has proposed that a gas boiler can't score above D on the heating measure. If that stands, a home that reached C on today's certificate thanks to a new condensing boiler would be judged on its insulation and its smart readiness (solar, battery, smart controls) instead. Many C-rated homes got there on the boiler, not the walls.
Catch 3: a new assessment can score lower than the last one
Today's score is a running-cost model, and the method changed in June 2025 (RdSAP 10). Landlords report the same flat scoring 69, then 68, then 62 across three assessments with improvements in between. A C starts at 69. If you're a borderline C, a voluntary re-assessment can lose the rating you already hold. Don't re-certify a borderline C unless you have to, and if you have to, pay an assessor to model it first.
Renew now, or wait?
| Your position | What we'd do |
|---|---|
| C, expires after 2030 | Nothing. It counts until it expires. Use the time to sort the fabric (insulation, draught-proofing) so the next certificate is a C on the new metrics too. |
| C, expires before 2030 | Plan for a new certificate on the new metrics. If the home can reach C today and you can lodge before the format changes (expected second half of 2027), doing it early buys a fresh ten years under today's rules. |
| C, score 69 to 72, gas-heated | Hold it. Don't re-assess voluntarily. Get the fabric work done and keep the invoices; spend from 1 October 2025 counts towards the £10,000 cap. |
| D, close to C | Get to C under today's method and lodge it before the format changes. That locks in a C to around 2037. Light bulbs, heating controls and corrected 'assumed' entries have moved homes from D to C. |
| D or below, far from C | Fabric first: it counts under both methods. Check the grants (a landlord's first D–G property can be fully funded where tenants are on a low income) and know the exemptions before deciding to sell. |
When you actually need a new EPC
Only when the property is next marketed, let or sold. A certificate doesn't have to be renewed mid-tenancy just because it expires. A room-by-room let is different: every new room tenancy is a new let, so the question comes round quickly. Replacing a boiler or windows doesn't force a new certificate either, though you may want one if it gets you to C.
How to check in two minutes
- Find the certificate on the register (or search your postcode on this site). Note the expiry date and the score, not just the band.
- Look at the main heating line. Gas, oil or LPG means the proposed heating cap applies to you.
- Look at the walls, roof and floor lines. "Assumed" means nobody checked; evidence can correct it.
- The free check on this site does the same from the register and tells you which row of the table you're in.
Questions landlords ask
- Will my existing EPC C still be valid after 2030?
- Yes, if it was lodged before 1 October 2029 and hasn't expired. It counts as meeting the standard until its expiry date, usually ten years after it was issued.
- Do I need a new EPC when the rules change in 2030?
- Only when the property is next marketed, let or sold, or when the current certificate expires. You don't have to renew mid-tenancy.
- Should I wait for the new-format EPCs before getting a new certificate?
- Usually not, if your home can reach C under today's method. A C lodged before the format changes counts until it expires. If the home can't reach C today, the works come first either way.
- Does a gas boiler mean I can't get a C?
- Under the government's proposal a gas boiler couldn't score above D on the heating measure, but the standard can also be met with a C on fabric plus a C on smart readiness. The proposal isn't final.
- Can a new assessment give me a lower score than my current certificate?
- Yes. The method changed in June 2025 and the score is a running-cost model, so the same home can score lower with no changes. Don't re-assess a borderline C unless you must.
- What's the deadline for locking in a C under today's rules?
- Legally 1 October 2029. In practice, new-format EPCs are expected from the second half of 2027, after which today's single C rating may no longer be issued.
Sources
- Government response: improving the energy performance of privately rented homes (Jan 2026)
- GOV.UK: Reforms to the energy performance of buildings regime (updated Mar 2026)
- GOV.UK: Domestic private rented property minimum standard, landlord guidance
- NRLA: EPC C and the new calculations, landlord FAQ (Jan 2026)
Guidance only, not legal or financial advice.
How does your property measure up?
Free check using the official EPC register. Takes under a minute.
Check my property