Most guidance on the EPC C by 2030 standard quietly assumes a house — a building you own outright and can insulate, reglaze or fit a heat pump to as you see fit. Flats are different. If you let a leasehold flat, the rules still apply to you, but a large share of the building's energy performance is decided by parts you don't control: the external walls, the roof, often the windows, and any communal heating system.
This guide is for landlords of leasehold flats. It covers what the 2030 standard means for you, which improvements you can actually make, when you need the freeholder's permission, and the exemption that exists when that permission is refused.
For the headline rules that apply to every rental, start with EPC C by 2030 for landlords and EPC requirements for landlords 2025-2030.
Yes, the 2030 standard applies to flats
In its January 2026 response, the government set out an intention to raise the minimum energy efficiency standard for private rented homes in England and Wales to EPC band C by 1 October 2030, with legislation still to follow. There is no carve-out for flats. A let leasehold flat rated D, E, F or G needs to reach C — or hold a valid registered exemption — by the deadline, the same as a house.
What changes for flats is not whether the standard applies, but how you can meet it. The current minimum to let any property remains band E; the 2030 C standard is confirmed government intention, not yet enacted law.
Why flats are harder: what's outside your control
A flat's EPC is assessed on the flat itself, but many of the levers that move the score sit with the building, not the leaseholder:
- External walls. Solid-wall flats — common in converted Victorian and Edwardian houses — gain the most from external wall insulation, but the external face of the building is the freeholder's, and cladding one flat in isolation is rarely practical or permitted.
- The roof. Loft insulation only helps the top-floor flat, and the loft space is often communal.
- Windows. Depending on the lease, replacing windows may need freeholder consent or may be the freeholder's responsibility entirely.
- Communal heating. Where heat comes from a shared district or communal boiler, an individual leaseholder usually cannot change the heat source.
The practical takeaway: before spending anything, work out which of your EPC's recommended measures are inside your demise (the part you control under the lease) and which need someone else's agreement.
What you can improve without freeholder consent
The good news is that the measures inside a typical flat's demise are also among the most cost-effective, and several are exactly what the assessment rewards. None of these normally needs external consent:
- Internal wall insulation on external-facing walls — more disruptive than external insulation, but within your control. See solid wall insulation costs and EPC impact.
- Draught-proofing around doors, windows, floors and any unused chimney.
- Heating controls and a smart thermostat — a programmer, room thermostat and TRVs, or a smart thermostat, are low-cost SAP wins.
- Low-energy lighting throughout.
- Hot water cylinder insulation where the flat has its own cylinder.
- Secondary glazing — an internal addition that usually avoids the consent issues of replacing the windows themselves. See double glazing and your EPC rating.
- Loft insulation top-up — for a top-floor flat with access to the loft.
For how these combine to move a rating, see how to improve your EPC from D to C.
When you need consent — and the exemption if it's refused
Some of the highest-impact measures for a flat — external wall insulation, solar panels, a heat pump, or replacing the windows — typically need consent from the freeholder, a superior landlord, or the planning authority. Converted period flats add listed-building or conservation-area constraints on top.
You are expected to ask. Request consent in writing, early, and keep every reply (including silence after reasonable attempts). This matters because the rules anticipate exactly this situation.
If you need third-party consent for a relevant improvement and that consent is refused or unreasonably withheld, you may be able to register a consent exemption on the PRS Exemptions Register, supported by your written evidence. This lets you continue to let the flat without that specific measure. The full set of exemption types, the evidence each needs, and how to register them is covered in EPC exemptions for landlords.
Consent refusal is not an automatic free pass: you are still expected to carry out the improvements you can make within your demise and within the cost cap.
The cost cap for a flat
The same cost cap applies: up to £10,000 per property of qualifying energy-efficiency spending, with expenditure from 1 October 2025 counting toward it. For a flat valued below £100,000, the cap is instead 10% of the property's value — so an £80,000 flat has an £8,000 cap.
If you reach your cap without achieving band C — or the only remaining measures need consent that has been refused — that supports registering an exemption rather than continuing to spend. Keep every invoice and certificate from October 2025 onward. The mechanics of what counts and how the cap interacts with exemptions are set out in EPC C by 2030 for landlords.
Converted vs purpose-built flats
The two broad flat types tend to behave differently:
- Purpose-built flats (especially mid-floor) often start with a head-start — fewer exposed surfaces, shared heat loss with neighbours — and may already be close to C. Internal measures and controls are frequently enough.
- Converted flats in older houses are the harder cases: solid walls, single-glazed sash windows, and original roofs, wrapped in a lease that limits external work. These are the flats most likely to need consent — and most likely to rely on an exemption if it is refused.
Knowing which you have, and reading your EPC's specific recommendations, tells you whether you are a quick-win case or a consent-and-exemption case.
What to do now
- Check the flat's current EPC and read its recommended measures — look it up by postcode.
- Split the measures into those inside your demise and those needing consent.
- Do the in-your-control measures first — they are cheaper, faster, and need no permission.
- Request consent in writing early for anything external or communal, and keep the correspondence.
- Register the relevant exemption if consent is refused or band C isn't reachable within the cost cap.
To track these steps alongside the rest of your obligations, work through our interactive landlord EPC compliance checklist — switch on its leasehold-flat steps for the consent and cost-cap points above.
The 2030 date is still some years off, but for leasehold flats the slow part isn't the building work — it's getting consent. Starting the conversation with your freeholder now is the single most useful thing you can do.
Check where your flat stands today: look up its EPC by postcode.