Energy performance has gone from a soft regulatory worry to a hard capex line in the underwriting spreadsheet. The 21 January 2026 gov.uk publication, Improving the energy performance of privately rented homes — government response, settled the two open questions landlords had been asking since 2021: when is the deadline, and how much will it cost. Answer: 1 October 2030, and up to £10,000 per property.
This guide walks through the rule as confirmed, the cost paths to compliance, the methodology change in 2029 that could move some properties below the bar, and how to bake the spend into deal-level underwriting today.
The deadline, confirmed
The earlier 2021 consultation floated a two-stage phase-in: EPC C for new tenancies from 2025 or 2028, with existing tenancies catching up by 2030. The January 2026 response scrapped that. There is now a single date — 1 October 2030 — by which every privately rented dwelling in England and Wales must hold a valid EPC of band C or better.
New tenancies, renewals, and continuing tenancies are all treated the same. There is no carve-out for existing tenants. If your property is rated D or below on 1 October 2030, you are non-compliant from that date.
The £10,000 spend cap
The compulsory spend per property is capped at £10,000 inclusive of VAT. This is the landlord's maximum exposure: if you have spent £10,000 on registered energy-efficiency measures and the EPC still won't reach C, you register a 10-year exemption on the PRS Exemptions Register and continue letting.
Three points landlords miss:
- The cap is per property, lifetime. You don't get a fresh £10k every five years.
- The cap is inclusive of VAT — so on standard-rated works, your usable ex-VAT budget is closer to £8,300.
- The exemption is not transferable on sale. A buyer inherits the remaining clock on the 10-year exemption; once it expires they must reassess and either upgrade or re-register.
The RdSAP 10 methodology shift
EPCs are calculated using a Reduced Standard Assessment Procedure (RdSAP). The current version is RdSAP 9; RdSAP 10 is scheduled to become mandatory from 2029. The new methodology recalibrates how heating systems, ventilation, lighting, and electric tariffs feed into the headline rating.
For properties on the C/D borderline, RdSAP 10 can swing the rating either way. Properties with modern heat pumps and good fabric tend to score better; properties with electric panel heating or older boilers tend to score worse. If your portfolio includes properties currently rated C but with electric heating, commissioning an indicative RdSAP 10 assessment before 2029 is a sensible insurance policy.
What it actually costs
Typical cost paths to push a D-rated property up to C, current market rates:
| Measure | Indicative cost (inc. VAT) | Typical SAP point gain |
|---|---|---|
| Loft insulation top-up (270mm) | £400 – £900 | 2 – 4 |
| Cavity wall insulation | £1,000 – £2,500 | 4 – 8 |
| Full LED lighting swap | £300 – £600 | 1 – 2 |
| New A-rated boiler | £2,500 – £4,500 | 3 – 6 |
| Double-glazing upgrade (whole property) | £6,000 – £15,000 | 2 – 5 |
| Air-source heat pump (pre-grant) | £8,000 – £18,000 | 6 – 12 |
| External wall insulation (solid wall) | £8,000 – £20,000 | 6 – 14 |
Most cavity-construction properties built between 1930 and 1990 can reach C within the £10k cap via cavity insulation, loft top-up, and lighting alone. Solid-wall Victorian and Edwardian stock, or post-1986 builds reliant on electric heating, often cannot — those properties are the candidates for the exemption register.
Capex shock in deal underwriting
A forced £10,000 capex hits IRR in a way that's easy to overlook on a Rightmove yield check. Worked example:
- Purchase: £200,000, EPC band D, 75% LTV
- Gross rent: £14,400/yr (£1,200 pcm)
- Operating costs (mgmt, voids, repairs, insurance): £4,000/yr
- Mortgage interest at 5%: £7,500/yr
- Net pre-tax cashflow: £2,900/yr, on £50k equity = 5.8% cash-on-cash
Now add the EPC capex. Assume a £10,000 spend in year 1 to reach C, amortised across a 10-year hold:
- Effective annualised drag: £1,000/yr
- Adjusted cashflow: £1,900/yr = 3.8% cash-on-cash
- IRR drag: roughly 80–120 bps depending on assumed appreciation
That's a material difference on a deal that, on raw yield, looked acceptable. The capex is unavoidable from 1 October 2030, so it isn't a downside scenario — it's the base case. See how to stress-test a buy-to-let for how to incorporate forced capex into a full stress framework.
Grants that reduce the bill
Two government schemes are currently live and can knock chunks off the gross spend:
- Boiler Upgrade Scheme: £7,500 grant toward an air-source or ground-source heat pump in England and Wales. Eligibility extends to private landlords; the grant is paid to the installer.
- ECO4: energy-supplier-funded scheme that can pay for insulation and heating works on lower-income tenant properties. Eligibility is tenant-led (income or benefits), so it only applies to a subset of the portfolio.
Both schemes are subject to change and have shifted eligibility several times since 2022. Confirm current criteria with the scheme administrator before assuming the grant in underwriting.
The exemption register
If a property cannot reach C after the full £10,000 spend, the landlord registers an exemption on the PRS Exemptions Register. Key mechanics:
- Exemption lasts 10 years from registration.
- Requires evidence: quotes, EPC pre- and post-works (if any works were done), receipts.
- Not transferable on sale — a buyer inherits the time remaining, then must reassess.
- Other exemptions exist (listed building consent refused, third-party consent refused, devaluation > 5%) but the “all relevant improvements made” route is by far the most common.
What to model now
Three concrete actions to take into the next 4 years:
1. Add a capex line to every D-rated comp
When pricing a new BTL purchase, add an explicit £5,000–£10,000 capex line for any property rated D or worse. Use the lower end for cavity-construction post-1930s stock; use the upper end for solid-wall pre-1930s. See our guide on calculating a maximum offer price for how to fold a known capex bill into your offer.
2. Stress-test the existing portfolio
Sum the assumed compliance spend across every non-C property you currently hold. That total is a known cash outflow before 1 October 2030. Test whether it can be funded from operating cashflow, refinance proceeds, or fresh capital — and price the choice now.
3. Get EPC re-assessments ahead of RdSAP 10
For any property whose EPC was assessed before 2023 and is currently rated C, plan a re-assessment under RdSAP 10 once it goes live. The methodology change is real and the downside risk — a C property dropping to D — is the worst possible position to discover at a tenancy renewal in 2031.
The deadline is 4½ years away. £10,000 is not a small number. Treat it as a known liability on every property in the portfolio that's rated D or worse, not as a 2029-problem that'll get solved later.
Frequently asked questions
Is the deadline definitely 1 October 2030?
Yes. The 21 January 2026 gov.uk publication "Improving the energy performance of privately rented homes — government response" confirmed a single deadline of 1 October 2030 for all privately rented sector tenancies to reach EPC C. The earlier consultation had floated a 2028 milestone for new tenancies and a 2030 backstop for existing tenancies — that two-stage approach was dropped in favour of a single hard date. New and continuing tenancies are treated the same.
What if my property already has EPC C?
No immediate action — but EPCs only last 10 years, and the methodology changes in 2029. If your current C was assessed under RdSAP 9 and the EPC needs renewing before letting a new tenancy after 2030, the fresh assessment under RdSAP 10 could land at a different rating. Borderline-C properties (a high D or low C) should consider commissioning a fresh assessment well before 2030 to confirm where they sit under the new methodology.
Does the £10,000 spend cap include VAT?
Yes. The cap is £10,000 inclusive of VAT, materials, and labour. That mirrors the structure of the previous £3,500 cap under the 2018 MEES regulations. Costs incurred above £10,000 are not compulsory — if the property cannot reach EPC C after spending up to the cap, the landlord can register an exemption.
Do the rules apply to HMOs the same way as standard BTLs?
Yes — the EPC and MEES regime applies per property (typically per building or self-contained unit), not per room. A single HMO with one EPC needs to hit C on that single rating; a multi-let with self-contained flats each holding their own EPC needs each unit to hit C separately. The £10,000 cap applies per EPC, not per HMO room.
Can I pass the upgrade cost on to tenants?
No. The £10,000 is a landlord compulsory spend — you cannot bill tenants directly for fabric upgrades or heating retrofits. You can of course re-price the rent on a new tenancy or at renewal, subject to the Renters' Rights Act rent-review rules, but there is no mechanism to invoice a sitting tenant for MEES works.
What's the penalty for non-compliance from October 2030?
Civil penalties up to £30,000 per property per breach, enforced by local authorities. The current MEES penalty cap is £5,000 — the increase to £30,000 was part of the 2026 government response. Penalties are non-rent and cumulative, so a landlord with multiple non-compliant properties faces multiple fines.
Is the £10,000 cap a one-off lifetime limit or per upgrade?
One-off, lifetime per property. Once you have spent £10,000 trying to reach C, you do not have to spend more — even if the next reasonable measure costs only £500. If you have already spent (say) £6,000 under the previous £3,500-cap regime since 2018 on registered measures, the relationship between historic spend and the new cap is an area the regulations clarify; check the specific provisions before assuming you can spend the full £10k fresh.
Will RdSAP 10 affect my existing EPC C rating?
Possibly. RdSAP 10 (mandatory from 2029) recalibrates the underlying inputs — particularly for heating systems, ventilation, and electric tariffs. Some properties currently sitting at low-C will fall to D under the new methodology; some D-rated properties will improve. The Building Research Establishment has published consultation drafts, but landlords should commission an indicative assessment if their current rating is borderline.