EPC C by 2030: what the Warm Homes Plan means for landlords

If you let residential property in England or Wales, the energy efficiency rules are about to get a lot tougher. This guide covers the law as it stands today, the confirmed government plan for EPC C by October 2030, and which upgrades actually move a property from a D to a C. It sits alongside the landlord compliance guide and the cost of owning guide.

The law today: EPC E, £3,500 cap

Right now, the legal minimum is EPC E. Since 1 April 2020 you cannot let (or continue to let) a domestic property rated F or G unless you have a valid exemption registered. The current cost cap is £3,500 including VAT: if you spend that on relevant improvements and the property still will not reach E, you can register a high cost exemption, typically valid for five years.

Penalties under the current regime max out at £5,000 per property across all breaches, enforced by local authorities.

That is the law you must comply with today, and it stays in force until the new standard takes over.

What January 2026 confirmed (and what it did not)

On 21 January 2026 the government published its response to the consultation on improving the energy performance of privately rented homes, alongside the Warm Homes Plan. The headlines:

• EPC C or equivalent by 1 October 2030 for all private rented homes in England and Wales, all tenancies. There is no earlier deadline for new tenancies, which earlier proposals had floated.
• A £10,000 per-property cost cap. Qualifying spend counts from 1 October 2025, so money you spend now is not wasted against the cap.
• A 10-year exemption if you spend the full cap and the property still falls short. You register it and carry on letting.
• A Property Value Adjustment for properties valued below £100,000: the cap drops to 10% of the property's value instead of the full £10,000.
• Penalties of up to £30,000 per property per breach under the new regime. That is six times today's maximum.

The government's own impact assessment estimates the average spend to reach the standard will be around £5,400 per property, well under the cap.

Now the crucial bit: this is confirmed policy, not law. The government has said it aims to lay a statutory instrument with the goal of it coming into force in 2027. Until that legislation passes, the 2030 deadline, the cap and the exemptions can all still change in the detail. Plan for it, budget for it, but do not treat it as settled law yet.

The EPC itself is changing too

The new standard will not be measured against today's A to G Energy Efficiency Rating. A reformed EPC is coming, built on the Home Energy Model (which replaces the old RdSAP methodology) and showing four headline metrics: fabric performance, heating system, smart readiness and energy cost.

The 2030 standard is a dual-metric test. You must meet a primary fabric performance standard first (insulation, glazing, airtightness), then a secondary standard of your choice: either smart readiness or heating system.

Timing has slipped. The reformed EPCs were originally due from October 2026, but in March 2026 the government confirmed a delay to the second half of 2027, with the exact date to be agreed with industry by summer 2026. Existing EPCs keep their 10-year validity, and reformed EPCs will carry the legacy A to G rating alongside the new metrics during transition.

Practical upshot: you cannot yet get an EPC that measures you against the 2030 standard, and probably will not be able to until late 2027.

What actually moves a D to a C

Under the current methodology, these are the workhorses. Costs are typical sourced ranges for an average semi-detached house; get quotes for your actual property.

Saving figures are Energy Saving Trust estimates as of 2026; boiler costs are typical installer ranges. A typical mid-band D property often gets to C with two or three of the cheaper items: loft top-up, cavity walls and heating controls frequently do it for £2,500 to £4,000. Solid-walled and off-gas properties are the hard cases, which is exactly what the £10,000 cap and 10-year exemption are designed for.

Two funding notes: zero-rate VAT applies to the installation of energy-saving materials until 31 March 2027, and schemes like the Warm Homes: Local Grant and the Boiler Upgrade Scheme (£7,500 towards a heat pump) can apply to eligible rented homes. Check eligibility at gov.uk before assuming anything.

Grandparenting: the October 2029 shortcut

There is a valuable transitional rule. A private rented home that scores C or higher on the existing Energy Efficiency Rating before 1 October 2029 will be treated as compliant with the new standard until that EPC expires or is replaced.

So if your property is a high D now, getting it to a C under today's methodology and locking in a fresh EPC before October 2029 buys you up to 10 years of compliance without touching the new dual-metric test. If you miss that window, you will need to commission a new-style EPC and meet the fabric-first standard instead.

Refurbishing anyway? Sequence it

If you have a refurb planned between now and 2030, fold the energy work in. Spend from 1 October 2025 counts towards the £10,000 cap, so keep every invoice. Insulate while walls are open, upgrade controls while the heating is being worked on, and aim to finish with a fresh EPC at C before October 2029 to claim grandparenting. Doing the same jobs twice, once for the refurb and once for compliance, is the expensive way round. Run the numbers on how upgrades affect your total returns with the cost of owning guide.

Mistakes people make

• Treating 2030 as law. It is a confirmed plan with regulations expected around 2027. Budget for it, but watch for the statutory instrument before making irreversible calls.
• Treating 2030 as a rumour. The opposite error. The direction of travel has survived a consultation, a formal response and a funded government plan. Waiting until 2029 means competing with every other landlord for the same installers.
• Ignoring today's EPC E rules because C is coming. F and G lets are illegal now, with fines up to £5,000.
• Not keeping invoices. Spend counts towards the £10,000 cap from 1 October 2025, but only if you can evidence it.
• Buying a cheap F-rated "bargain" without pricing the upgrade. A £10,000 cap per property changes the maths on solid-wall terraces. Factor it into your offer.
• Missing the 2029 grandparenting window when the property is only a few points off a C today.

Sources: gov.uk, Improving the energy performance of privately rented homes: government response | gov.uk, Warm Homes Plan | gov.uk, Domestic private rented property minimum energy efficiency standard landlord guidance | gov.uk, Reforms to the Energy Performance of Buildings regime, partial government response | Energy Saving Trust, roof and loft insulation | Energy Saving Trust, cavity wall insulation

Education, not financial advice. For mortgage advice, speak to an FCA-authorised broker.