The rule is now confirmed: every privately rented home needs a C rating by 1 October 2030. Here's what counts, what it might cost, and the order to tackle it.
Updated 1 October 2026
The rules, confirmed
- Deadline: every private tenancy in England and Wales, new and existing, from 1 October 2030. Until then the minimum stays at E.
- Two tests, not one. New-style EPCs, available from October 2026, score several things separately. Rentals must reach C on fabric performance (insulation, windows, draughts) first, then on either the heating system or smart readiness, whichever you choose.
- Cost cap: you never have to spend more than £10,000 per property, or 10% of its value if it's worth under £100,000. Money spent from 1 October 2025 counts towards it.
- Already at C? A C rating on a current-style EPC issued before 1 October 2029 counts until that certificate expires or is replaced.
- Exemptions exist if you hit the cap and still fall short, if work would damage the property, for solid wall insulation, and where consent can't be obtained. They have to be registered.
- Fines go up to £30,000 per property.
The government estimates the average upgrade will cost around £5,400. You won't be required to replace a heating system that works.
Step 1: Read your current EPC
Look up the certificate on GOV.UK's Find an energy certificate service. The recommendations section lists the upgrades the assessor modelled, with a rough cost and how much each would lift the rating. It's the best starting list for your property. If the EPC is old or the property has changed since, a new assessment is worth the cost before you spend on works.
Step 2: Do the cheap things first
| Upgrade | Typical job | Mainly helps |
|---|---|---|
| Loft insulation top-up | A day, often a few hundred pounds | Fabric |
| Draught-proofing doors, windows and floors | DIY or a day's work | Fabric |
| Hot water cylinder jacket and pipe lagging | An hour, very low cost | Heating |
| Heating controls: programmer, room thermostat, radiator valves | Half a day for a heating engineer | Heating, smart readiness |
| Smart meter and smart heating controls | Smart meters are free from the energy supplier | Smart readiness |
| Low-energy lighting throughout | DIY, low cost | Overall rating |
| Cavity wall insulation | A day, if the walls are suitable | Fabric |
Costs vary a lot by property. Get quotes and check installers are accredited.
Step 3: Plan the bigger jobs
- Floor insulation under suspended timber floors. Easiest during a void or refurbishment.
- Double or secondary glazing, especially where single glazing remains. Secondary glazing is often allowed in conservation areas when replacement windows aren't.
- Solid wall insulation, internal or external. Effective but costly and disruptive, which is why it has its own exemption.
- Solar panels, which can lift the rating and cut tenants' bills.
- Heat pumps. Landlords can claim the £7,500 Boiler Upgrade Scheme grant for an air or ground source heat pump, and the grant doesn't count towards your £10,000 cap.
Do the fabric work before changing the heating. A well-insulated home needs a smaller, cheaper heating system, and fabric is the test you have to pass first.
Grants and help
- Boiler Upgrade Scheme: £7,500 towards an air or ground source heat pump. Rental properties qualify. Your installer applies for you.
- Warm Homes: Local Grant: run through councils for homes rated D to G where the household is on a low income. Ask your council whether it covers your area and tenants.
- Your council's private housing team often knows which local schemes are open. They change frequently.
Money and tax
Many energy upgrades count as improvements rather than repairs, so they usually can't be deducted from rental profit. Replacing like for like, such as a broken boiler with a modern equivalent, usually can. Keep every invoice: improvement costs can reduce capital gains tax when you sell, and you'll need proof of spending if you claim the cost cap exemption. Check the tax treatment with your accountant.
A simple plan
- Check each property's current EPC rating and recommendations.
- Do the cheap fabric and controls jobs at the next gas safety visit or tenant change.
- Book bigger jobs for void periods between now and 2030, so you're not competing for installers in the final year.
- Keep invoices in one place for each property.
- Get a new EPC once the work is done, ideally before October 2029.
- If you've spent the cap and still fall short, register an exemption.