My EPC Is Too Low: What Are My Options?

If your EPC is below E, you are already in the danger zone: you cannot legally let or continue to let unless you either upgrade or have a valid exemption on the PRS Exemptions Register.

"This guide provides general information about UK landlord tax obligations. It is not financial or legal advice. Tax treatment depends on your individual circumstances and may change. Consider consulting a qualified accountant or solicitor for advice specific to your situation."

1. Immediate risk check: can you legally let it today?

Current legal minimum (England and Wales)

Since 1 April 2020, almost all privately let properties must be EPC E or better to be let or continue being let.

Government has now committed in principle to raising PRS MEES to EPC C by 2030, with a proposed GBP 10,000 per-property cost cap over 10 years.

So:

• EPC F or G now and no exemption = you should not be granting new tenancies and are technically in breach if you continue to let.
• EPC D or low C = you can let now, but you need a 2030 plan, or you risk being stuck with a non-compliant asset later.

2. Exemptions and the cost cap (E now, C by 2030)

Two levels of cost cap in play

Current E minimum

• Official MEES guidance still uses a GBP 3,500 (inc VAT) cost cap: if you have spent that or would need to spend that and still cannot reach E, you can register an exemption.

Planned C minimum by 2030

• Government response now signals a GBP 10,000 cap per property over 10 years for C-level upgrades (or 10% of property value, whichever is lower, in some proposals).

Exemption route (for E now and C later)

1. Get a new EPC and, ideally, an independent retrofit or MEES report showing recommended measures and expected rating.
2. Obtain quotes and implement all "relevant energy efficiency improvements" you can within the cap (or show that even the cheapest measure breaches the cap).
3. If you still cannot get to E (now) or C (when those rules bite), register an exemption on the PRS Exemptions Register.

To register you need:

• The current EPC.
• Evidence of works done and costs, or quotes showing costs above cap.
• Evidence for any specific exemption (for example wall insulation not appropriate, devaluation reports).
• Exemptions last 5 years and must then be renewed or replaced.

3. Upgrade path: cheapest points first

Your job is to buy as many EPC points as possible for every GBP 1,000 you spend. The usual order of attack:

Loft insulation

• Aim for at least 270mm depth.
• Typical cost GBP 300-400 for a typical house; can slash heat loss through the roof and gain several EPC points.

Cavity wall insulation (if suitable)

• Typical cost GBP 370-600; saves around 25-35% of heat loss.
• One of the biggest EPC jumps per pound spent.

Draught-proofing, LED lighting and heating controls

• LED bulbs, TRVs, smart programmer/room stat.
• Usually hundreds, not thousands, but they tick EPC recommendation boxes and help you climb from low E to solid D.

Floor insulation (suspended timber floors)

• Costs GBP 500-1,300+, decent EPC gain but more invasive.

Double / triple glazing

• Expensive relative to pure EPC gain, but often needed to get from solid D to low C.
• Consider when windows are due anyway.

Solid wall / external wall insulation

• Big hammer for solid-walled stock: GBP 8,000-15,000 for external, GBP 4,000-8,000 internal, but huge EPC impact.
• This is where you rapidly hit the GBP 10k cap.

Heat pump

• Air-source heat pump usually GBP 8,000-15,000 before grants.
• Massive efficiency jump if the rest of the fabric is good.

4. Grants and funding you should check now

You should not spend your own GBP 10,000 until you know what the state will pay.

Main schemes (2026)

ECO4

• Energy Company Obligation, running to December 2026.
• Can fully fund or heavily subsidise insulation, heating upgrades and sometimes heat pumps where the tenant is on qualifying benefits or the property is in a low-income area.

Boiler Upgrade Scheme (BUS) - England and Wales

• Grant of GBP 7,500 towards an air-source or ground-source heat pump, one grant per property.
• Available to all owner-occupiers and landlords, no means test, via an MCS-certified installer.

Home Energy Scotland, Nest (Wales), local authority schemes

• Scotland: interest-free loans plus GBP 6-7.5k cashback on heat pumps and other measures.
• Wales: Nest scheme for low-income households.
• Many councils have GBP 1-5k local grants for insulation or low-carbon heating.

Every grant pound spent still counts towards the GBP 10k cost cap for the purposes of registering a C-level exemption, but it is still cash you do not have to provide yourself.

5. Upgrade vs sell: making a call with real numbers

For each F/G or marginal D property you should work out, on paper:

Option 1 - Upgrade

• Use the EPC upgrade calculator to cost a path to solid C.
• Deduct ECO4/BUS and local grants.
• Check if total landlord spend is under GBP 10,000.

Option 2 - Exemption + hold

• Spend only up to the cap, then register an exemption if still below E or C when rules bite.
• Accept that this property may become harder to sell or remortgage as lenders tighten green criteria.

Option 3 - Sell before the market fully prices in EPC C

• In some marginal cases (small northern terrace on F/G), dropping GBP 15,000-20,000 to get to C is worse than taking a slightly lower sale price now and recycling capital into a more efficient property.

The numbers, not sentiment, should drive the decision.

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