EPC Changes Are Coming: Is Your Rental Property Ready?

The EPC system is being overhauled

Energy Performance Certificates have been a fixture of the lettings process for years, but the system behind them is about to change fundamentally. The government has confirmed that the current Standard Assessment Procedure (SAP) will be replaced by a new Home Energy Model, delivering a far more detailed and accurate picture of a property's energy performance.

Originally slated for earlier introduction, the new model has been delayed to the second half of 2027, with the reformed EPCs becoming mandatory from October 2029. The delay gives assessors time to retrain and the software supply chain time to adapt — but it does not change the compliance deadline that follows shortly after.

A new way of measuring energy performance

The current EPC system produces a single A-to-G rating based largely on estimated energy costs. The reformed system will be considerably more granular, measuring four separate indicators:

1. Energy Cost Rating — estimated annual energy costs, similar to the current primary metric but calculated with greater accuracy
2. Fabric Performance Rating — how well the building envelope (walls, roof, floors, windows) retains heat
3. Heating System Rating — the efficiency and carbon intensity of the property's heating system
4. Smart Readiness Indicator — the property's capacity to integrate with smart energy technologies, such as smart thermostats and demand-side response

For landlords, this means a more nuanced assessment. A property with excellent insulation but an ageing boiler will no longer receive a single middling grade — it will score well on fabric performance but poorly on heating, making it clearer where investment is needed.

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The scale of the challenge

The numbers paint a stark picture. According to the most recent English Housing Survey data, 52% of private rented sector properties are currently rated below EPC C. That represents hundreds of thousands of homes that will need improvements before the 2030 deadline.

For landlords with multiple properties, the cumulative cost of upgrades could be significant. The government has set a £10,000 cost cap per property — confirmed as part of the January 2026 Warm Homes Plan — above which landlords can apply for an exemption if the C rating remains unachievable. However, the exemption regime is expected to be considerably tighter than the current system.

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Common upgrades and typical costs

The most effective improvements for moving a property from a D or E rating up to a C tend to be well-established measures. The right combination depends on your property's construction, age, and current rating, but the most common upgrades include:

• Loft insulation — often the cheapest and most impactful measure, typically costing £300–£600 for a top-up to current standards
• Cavity wall insulation — effective where cavities exist, usually £500–£1,500 depending on property size
• Double or triple glazing — replacing single-glazed windows can cost £3,000–£7,000 but significantly improves fabric performance
• Boiler upgrade or heat pump — a modern condensing boiler costs around £2,000–£3,500, whilst an air source heat pump can run to £7,000–£14,000 (grants may be available via the Boiler Upgrade Scheme)

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Exemptions: available but tightened

Under the current Minimum Energy Efficiency Standards (MEES), landlords can register an exemption if they can demonstrate that all cost-effective improvements have been made, or that the £3,500 spending cap has been reached. The reformed system will be stricter.

The new exemption framework is expected to:

• Raise the spending threshold to the £10,000 cost cap before an exemption can be claimed
• Require independent verification of the improvements carried out and their costs
• Limit exemption duration, requiring landlords to reassess and re-apply rather than relying on a one-off registration
• Narrow the grounds on which exemptions can be claimed, particularly for consent-based exemptions (e.g. where a freeholder refuses permission for works)

In short, exemptions will remain available for genuine cases, but they will not be a blanket escape route. Landlords should plan on the basis that upgrades will be required.

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What landlords should do now

With four years until the compliance deadline, there is still time to plan — but the window for securing tradespeople and favourable quotes narrows as 2030 approaches. Here is a practical checklist:

1. Get your current EPC — if your certificate is more than a few years old, commission a fresh assessment so you know your baseline. EPCs are valid for 10 years, but an older one may not reflect improvements you have already made.
2. Identify the right improvements — your EPC report includes a recommendations page listing measures and their estimated impact. Use this as a starting point, and consider getting a more detailed retrofit assessment for properties that need substantial work.
3. Budget for upgrades — factor energy efficiency works into your financial planning. Spreading costs over multiple tax years where possible can ease the burden, and some improvements may be deductible against rental income.
4. Check available grants — the Boiler Upgrade Scheme, ECO4, and local authority programmes can all contribute towards costs. Eligibility criteria vary, so check early.
5. Prioritise properties closest to the threshold — a property rated D that only needs loft insulation to reach C is a quick win. Focus on those first, then tackle the more complex cases.

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How Rental1 helps you stay on top of EPC compliance

Managing EPC deadlines across a portfolio can be challenging, particularly if you are tracking multiple properties with different certificate expiry dates and improvement timelines. Rental1 is built to help:

• Automatic EPC discovery — Rental1 automatically finds your property's current EPC rating and certificate details based on its address. No manual uploads or data entry required
• Automated reminders — receive alerts before certificates expire, giving you time to arrange reassessments and avoid lapses
• Portfolio-wide visibility — see at a glance which properties are at risk and where to focus your improvement spend