The £10,000 EPC Cost Cap Explained (and Why October 2025 Matters)

The £10,000 cost cap is one of the most misunderstood aspects of the upcoming EPC regulations — and one of the most important. In simple terms: as a landlord, you are required to spend up to £10,000 per property on qualifying energy efficiency improvements to reach EPC Band C before October 2030. If you hit that spending threshold and your property still cannot reach Band C, you can register for an exemption.

But here is the detail that changes everything: the cap is retroactive to 1 October 2025. That means money you spend on qualifying improvements right now counts towards the cap. If you are strategic about your timing and spending, this works significantly in your favour.

What the cost cap actually means

The cost cap is not a “budget” or a “maximum.” It is the threshold at which you become eligible for an exemption. The government is saying: we expect you to invest up to £10,000 per property in reaching Band C. If that amount is not enough, we recognise the property may have inherent limitations and we will grant you an exemption.

Importantly, this is a per-property cap, not a portfolio-wide cap. If you own five rental properties, the cap is £10,000 for each — a potential total outlay of £50,000 across your portfolio if none of them can reach Band C within that budget.

Retroactive from 1 October 2025

This is the single most important detail in the entire cost cap framework. The government has confirmed that qualifying expenditure from 1 October 2025 onwards counts towards the £10,000 cap. This has three major implications:

• Spending now is not premature — it is strategic. Every pound you spend on qualifying improvements from October 2025 onwards reduces your remaining obligation under the cap.
• You can spread the cost over five years. Rather than facing a £10,000 bill in 2030, you can invest £2,000 per year from 2025 to 2030 and achieve the same compliance position.
• Early action secures installer availability. There are approximately 5 million private rented properties in England. Even if half already meet Band C, that leaves 2.5 million properties competing for the same pool of installers as 2030 approaches.

What qualifies as a qualifying improvement

Not every property expense counts towards the cap. Qualifying improvements are energy efficiency measures that directly improve the property’s SAP rating. These include:

• Loft insulation (installation or top-up to current standards)
• Cavity wall insulation
• Solid wall insulation (internal or external)
• Underfloor insulation
• Double or triple glazing (replacing single glazing)
• Draught-proofing
• Heating system replacement (condensing boiler, heat pump, biomass boiler)
• Heating controls (smart thermostat, TRVs, programmer)
• Hot water cylinder insulation
• Solar photovoltaic panels
• Solar thermal hot water systems
• LED lighting upgrades

The work must be carried out by a qualified installer, and you must retain invoices as evidence. For measures such as heat pumps and solar panels, the installer must be MCS-certified.

What does NOT qualify

The following expenditure does not count towards the £10,000 cap:

• General repairs and maintenance: Fixing a roof leak, repointing brickwork, replacing guttering
• Cosmetic works: Redecorating, new kitchens, bathroom refurbishments
• Appliances: New fridge, washing machine, oven (even if energy-rated A+++)
• Boiler servicing: Annual gas safety checks and routine boiler maintenance
• EPC assessment fees: The cost of commissioning the EPC itself
• Professional fees: Architect, surveyor or project management fees (unless directly tied to an improvement installation)

How to document your spending

If you need to register a cost cap exemption, you will need to prove every pound of your £10,000 spend. Good record-keeping is essential from day one:

• Keep all invoices and receipts: Itemised invoices from the installer showing the work carried out, materials used, and date of completion
• Installer certificates: MCS certificates for heat pumps and solar, FENSA certificates for windows, cavity wall guarantee certificates
• Before and after photos: Photograph the existing state before work begins and the completed installation
• EPC reports: Commission a new EPC after each significant improvement to document the SAP score progression
• A spending log: Maintain a simple spreadsheet recording each improvement, date, cost, installer name and certificate number

Store copies digitally as well as retaining paper originals. If a local authority enforcement officer challenges your exemption in 2031, you need to be able to produce evidence immediately.

The procrastinator’s maths

Many landlords plan to wait until 2029 or even 2030 to carry out improvements. This is a risky strategy for several reasons:

Spreading the cost is not just easier on your cash flow — it is genuinely cheaper because you avoid the demand premium that will hit the market in 2029–2030.

How the cost cap exemption works

If you have spent £10,000 or more on qualifying improvements and your property still has a SAP score below 69 (Band C), you can register for a cost cap exemption on the PRS Exemptions Register. The process requires:

• Evidence of at least £10,000 in qualifying spend (invoices, certificates)
• A current EPC showing the property is still below Band C despite the works
• Registration on the PRS Exemptions Register with supporting documents

The exemption is valid for five years and can be renewed. For full details on all available exemptions, see our guide on EPC Exemptions 2030: When You Don’t Have to Reach Band C.

For the complete picture of what Band C requires and how to get there, see our EPC Band C Requirements for Landlords guide.