Energy Performance Certificates are one of the most financially consequential compliance requirements for UK landlords in 2025 — and one of the most misunderstood. A property with a D or E rating that requires significant upgrading to reach C represents a genuine financial decision: invest in improvements, apply for an exemption, or sell. Getting this decision right requires understanding the compliance timeline, the real cost of improvements, and whether the investment is recoverable through higher rents or reduced void risk.
The EPC rating scale explained
C is the upcoming minimum standard target. E is the current minimum for privately rented properties in England and Wales.
An EPC rates a property's energy efficiency on a scale from A (most efficient) to G (least efficient), based on the fabric of the building, insulation levels, heating system, hot water system, windows, and lighting. The rating is expressed as a numerical score (1–100) and a letter band. The assessment is carried out by an accredited energy assessor using a standard methodology (SAP — Standard Assessment Procedure).
Current minimum standard and what's coming
Current requirement: minimum EPC E
Since April 2020, it has been illegal in England and Wales to let a residential property with an EPC rating of F or G to a new tenant. Since April 2023, this applies to all tenancies — including existing ones — not just new lets. Landlords with F or G rated properties must either improve the rating to E or above, or register a valid exemption. The maximum civil penalty for non-compliance is £5,000 per property.
The EPC C standard — when and what it means
The current government has committed to requiring a minimum EPC rating of C for all newly rented properties, with further extension to all existing tenancies. The specific implementation timeline has been subject to repeated delays — the previous government set deadlines that were subsequently withdrawn. As of June 2025, the government has confirmed its commitment to EPC C as a minimum standard but the final implementation date has not been formally legislated.
For landlords, the practical position is: plan for EPC C compliance to be required at some point in the late 2020s. Properties currently rated D or E that cannot be cost-effectively upgraded to C represent a known financial risk — either investment now or a constraint on letting later.
For many landlords with older stock, the prospect of an EPC C requirement has become a factor in the exit decision. A Victorian terrace with a current D rating requiring £15,000–£25,000 in EPC improvements may not be worth the investment — particularly where the property is already marginally profitable and the improvement costs cannot be recouped through higher rents. This is one of the structural drivers of the landlord exodus discussed in our landlord exit analysis.
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EPC improvement measures — costs and impact
| Measure | Typical cost | EPC points uplift | Notes |
|---|---|---|---|
| Loft insulation (uninsulated to 270mm) | £300–£600 | 10–15 pts | Single highest ROI measure. Often free via ECO4 scheme for eligible properties. Requires accessible loft void. |
| Cavity wall insulation | £400–£800 | 8–12 pts | Only for properties with cavity walls (most 1930s+ brick). Can be free via ECO4. Survey required first. |
| Boiler replacement (A-rated combi) | £1,800–£3,500 | 5–15 pts | Replacing G-rated boiler with A-rated produces largest single-measure uplift. Essential where existing boiler is inefficient. |
| Draught proofing (doors, windows, floors) | £200–£600 | 2–4 pts | Low cost, meaningful impact in older properties with significant air leakage. Often overlooked. |
| Low-energy lighting (LED throughout) | £50–£200 | 1–3 pts | Minimal cost, modest uplift. Easy first step but rarely enough alone to change band. |
| Hot water cylinder insulation | £15–£30 | 1–2 pts | Jacket insulation for existing cylinder. Cheapest EPC measure available. |
| Double glazing (single to double) | £3,000–£8,000 | 3–6 pts | High cost relative to EPC impact. Often done for other reasons (comfort, noise) — EPC benefit is secondary. |
| Solid wall insulation (external) | £8,000–£20,000 | 15–25 pts | Required for solid-wall properties (pre-1930s) to achieve significant uplift. Very high cost. Planning permission may be needed. |
| Heat pump (air source) | £8,000–£15,000 | 5–20 pts | High capital cost offset by Boiler Upgrade Scheme grant (£7,500). EPC impact variable — works best in well-insulated properties. |
EPC exemptions — when you can comply without upgrading
Available when all relevant measures would cost more than the government's cost cap (currently £3,500 — expected to rise for EPC C). Register on the PRS Exemptions Register. Must get three quotes confirming costs exceed the cap. Valid for 5 years — then must be reviewed.
If all recommended EPC measures have been installed but the property still does not meet the minimum standard, this exemption applies. Must evidence that all recommendations on the EPC have been completed. Register on PRS Exemptions Register.
Where relevant improvements require third-party consent that cannot be obtained — e.g. freeholder or superior landlord refuses to allow insulation works in a leasehold property, or listed building consent denied. Requires evidence of request and refusal.
Where a RICS surveyor confirms that making the required improvements would reduce the market value of the property by 5% or more. Most commonly applicable to listed buildings or properties with unusual construction where insulation could cause damage. Very rarely applicable to standard residential stock.
How to register an exemption
All valid exemptions must be registered on the government's PRS Exemptions Register before a new tenancy begins on a non-compliant property. Claiming an exemption verbally or informally does not protect against enforcement action — only registration on the official register is valid. The register is publicly searchable, and local authorities use it when investigating non-compliance complaints.
EPC and rental value — does a higher rating produce higher rent?
The relationship between EPC rating and achievable rent is not straightforward — but the evidence from multiple market studies suggests it is real, particularly as EPC awareness among tenants has grown:
- Properties with EPC C or above are increasingly preferred by tenants who factor energy costs into their total housing budget. A property rated D paying £1,200/month rent plus £120/month in energy costs is effectively more expensive than a C-rated property at £1,220/month with £80/month energy costs.
- Void risk reduction is the most tangible economic benefit. Properties rated E or below increasingly face longer void periods as tenants with choice opt for better-rated stock. A reduction in average void from 4 weeks to 3 weeks on a property generating £1,100/month is worth £275/year in avoided void costs.
- Tenant quality improvement is reported anecdotally by landlords who have upgraded from D/E to C — higher-specification tenants (better employed, longer tenure) appear to self-select into better-rated properties.
Frequently asked questions
What is the penalty for renting a property with a below-minimum EPC?
The maximum civil penalty in England and Wales for renting a property with an EPC below the minimum standard (currently E) without a valid registered exemption is £5,000 per property. Penalties are issued by local housing authorities following investigation — typically triggered by tenant complaints or proactive enforcement. Additionally, a property in breach cannot have a Section 21 notice served (prior to its abolition) — failure to have a valid EPC available at letting also prevents Section 21 use. These enforcement consequences make EPC compliance non-optional.
Does an EPC expire and when do I need to renew?
An EPC is valid for 10 years from the date of issue. Landlords must have a valid (non-expired) EPC available whenever a property is marketed to let and must provide a copy to each new tenant. An EPC only needs to be renewed when it expires or when you choose to upgrade the property and want to capture the improvement in a new certificate. If you have carried out significant improvements since the last EPC was issued, getting a new assessment will typically show an improved rating — which may be valuable for marketing, compliance, and avoiding void risk.
Can tenants request EPC improvements from their landlord?
Under the Energy Efficiency (Private Rented Property) (England and Wales) Regulations 2015, residential tenants have the right to request consent to make energy efficiency improvements, and landlords should not unreasonably refuse. Separately, under the Green Deal and subsequent energy efficiency regulations, landlords may be eligible for (or required to apply for) government funding for improvements. The current ECO4 (Energy Company Obligation) scheme provides free or heavily subsidised insulation and heating improvements for properties with low EPC ratings where tenants are on certain benefits or where properties are in targeted low-income areas.
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