EPC C Upgrade Cost Calculator — Landlord Retrofit Costs for 2030
Price up loft, wall, glazing and heating measures against real Energy Saving Trust costs, check the total against the government's £10,000 cap for 1 October 2030, and see what's law today versus confirmed policy still awaiting legislation.
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The government has now confirmed how EPC C for rented homes will work — one compliance date, a £10,000 cost cap, and a wider set of exemptions — but it is not the law yet. DESNZ published its response to the 2025 consultation on 21 January 2026 as part of the £15bn Warm Homes Plan: private rented homes in England and Wales must meet a new, dual-metric EPC C standard by 1 October 2030, with landlords required to spend up to £10,000 per property to get there. That is settled policy, not a proposal — but the regulations that will actually require it have not been laid before Parliament yet. This calculator prices the measures you tick against real Energy Saving Trust costs, checks the total against the £10,000 cap, and shows the tax side landlords ask about next.
What’s law today, and what’s policy awaiting legislation
- Law right now: the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015 require a minimum of EPC E to let a property, subject to the existing exemptions register.
- Confirmed policy, not yet law: the 21-January-2026 response sets EPC C, the £10,000 cap and 1 October 2030 as government’s settled direction. Government will first seek new primary powers by Act of Parliament, then lay a statutory instrument, “with the aim of it coming into force in 2027.” Until then, EPC E remains the legal minimum.
The date that replaced “2028 for new tenancies”
The 2025 consultation had asked about phasing the standard in — new tenancies from 2028, all tenancies by 2030. The response drops that: “All tenancies within scope of the regulations must be compliant with the standard by 1 October 2030. There will not be an earlier compliance date for new tenancies.” One date, for every tenancy. A property already scoring EPC C or above before 1 October 2029 stays compliant until that certificate expires — check your own EPC’s expiry date rather than assuming either year applies to you.
How the £10,000 cap actually works
The cap is a ceiling, not a target: government’s own impact assessment estimates the average property will need around £5,400 — a little over half the cap. The standard is also fabric-first: bring the building fabric (walls, loft, windows) up to standard first, then choose a heating-system or smart-readiness route for the second metric. EPC assessment costs and most third-party grants count towards the £10,000 — except money from the Boiler Upgrade Scheme, which does not, so a BUS-funded heat pump uses up less of your cap than the same spend funded any other way.
The exemption route once you hit the cap
If a property is still below standard once £10,000 has genuinely been spent (or the cheapest recommended measure alone would exceed the cap), the landlord can register a ‘cost cap’ or ‘high-cost’ exemption and keep letting it — both valid for 10 years. A ‘Property Value Adjustment’ exemption lowers the cap to 10% of the property’s value for homes worth under £100,000, and flats needing a freeholder’s consent for external work have a ‘third-party consent’ exemption. None of this is automatic — each has to be registered on the PRS MEES Exemptions Register, and local authorities can fine up to £30,000 per property per breach where none is registered.
Is the spend a repair or capital?
The same repair-vs-capital line HMRC applies elsewhere in a rental property applies here — see our full EPC C for rentals by 2030 guide for the detail. Topping up existing loft insulation is normally a repair, deductible in full against rental income the same year. First-time or upgrade work — cavity or solid wall insulation where there was none, double glazing replacing single glazing, a heat pump replacing a boiler, a first solar PV system — is normally capital: not deductible now, but it reduces the gain when the property is sold. Certificates and small consumables (an EPC assessment, LED bulbs) are allowable revenue costs. The calculator flags each ticked measure against that line.
For the full list of what’s deductible, see allowable expenses; for certificates, see gas safety, EICR & EPC certificates; for boilers on their own, see is a new boiler tax deductible; and if this spend feeds into a sale, run it through the capital gains tax calculator.
England & Wales only. Policy: DESNZ, “Improving the energy performance of privately rented homes: government response” (published 21 Jan 2026, Warm Homes Plan), read in full 13 Sep 2026 — £10,000 cap, £5,400 average estimate, 1 Oct 2030 date, exemptions and validity, BUS carve-out, SI targeted for 2027, all quoted directly from that document. Today’s legal minimum (EPC E) is the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015. Scotland has a separate, still-proposed timeline (new tenancies 2028, all tenancies 2033), not covered above. Measure costs: Energy Saving Trust advice pages (loft, cavity wall, solid wall, windows and doors, heating controls, heat pumps, solar panels), Great Britain figures, read 13 Sep 2026. General information, not advice; get quotes for your own property.
Asked constantly
Not yet, in a legal sense. The government has confirmed 1 October 2030 as its single compliance date and £10,000 as the cost cap in a published response (21 January 2026), but the regulations that will actually require it have not been laid before Parliament — government's own timeline targets the statutory instrument coming into force in 2027. Today's legal minimum is still EPC E.
£10,000 is a ceiling, not a target — government's own impact assessment estimates the average property will need around £5,400. If a property is still below the standard after £10,000 has genuinely been spent, the landlord can register a 'cost cap' exemption, valid for 10 years, and keep letting it.
No. That was one option in the 2025 consultation. The government response confirms a single date, 1 October 2030, for every tenancy — new and existing — with no earlier date for new lets.
It depends on the measure. Topping up existing loft insulation is normally a repair, deductible against rental income the same year. First-time insulation, double glazing replacing single glazing, and a heat pump replacing a boiler are normally capital — not deductible as an expense, but they reduce the gain when you sell. See our EPC certificates and new boiler guides for the detail on specific items.
Government's response says a property scoring EPC C or higher before 1 October 2029 is treated as compliant with the new standard until that certificate expires or is replaced. Check your own EPC's actual expiry date rather than assuming either year applies automatically.
No — this calculator covers England and Wales, where the DESNZ response applies. Scotland is running its own, separate process: proposals published in June 2025 aim for new tenancies to comply from 2028 and all tenancies from 2033, but those dates are still proposed, not law, and are reported as affected by a wider delay to EPC reform.
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Sources
The primary documents this page is built from. Links checked 5 September 2026.
- Improving the energy performance of privately rented homes: 2025 update — GOV.UK
- Roof and loft insulation guide — Energy Saving Trust
- Cavity wall insulation — Energy Saving Trust
- Solid wall insulation — Energy Saving Trust
- Energy efficient windows and doors — Energy Saving Trust