The New EPC Metrics Explained — What Oxfordshire Landlords Need to Know Before 2030
The way your property’s energy performance is measured is about to change completely. The government is replacing the current single EPC rating with four new metrics, and understanding how they work is the key to making smart upgrade decisions before the October 2030 deadline.
The new system, called the Home Energy Model (HEM), replaces the Standard Assessment Procedure used for EPC assessments for over a decade. Originally due in October 2026, the rollout has been pushed back to the second half of 2027 — but the MEES compliance deadline of 1 October 2030 has not moved. That gives landlords roughly three years between the new system launching and every private rented property needing to meet the standard or hold a valid exemption.
THE FOUR NEW EPC METRICS
Instead of one overall A to G rating based mainly on estimated energy costs, your EPC will show four separate scores:
- Fabric Performance: How well your building retains heat — insulation, windows, airtightness, and thermal bridging. Assessed independently of the heating system, showing the quality of the building itself
- Heating System: How efficient and low-carbon your heating is. Gas boilers cannot achieve a C under this metric. Heat pumps and low-carbon heat networks score highest
- Smart Readiness: Your property’s ability to generate its own energy and use smart technology. Solar panels plus a smart meter is typically enough for a C rating
- Energy Cost: An estimated annual running cost in pounds, giving tenants a clear picture of what the property costs to run
HOW THE DUAL-STANDARD COMPLIANCE WORKS
To comply with the 2030 MEES requirement, your property must meet EPC Band C on two of the new metrics. The first is mandatory:
- Primary standard (required): Fabric Performance — you must bring the building’s insulation, glazing, and airtightness up to at least a C rating
- Secondary standard (your choice): Once Fabric Performance is met (or you have a valid exemption), you choose between the Heating System metric or the Smart Readiness metric
This gives you flexibility. If your property has a gas boiler, it will not pass the Heating System metric — but you can meet Smart Readiness instead by installing solar panels and a smart meter. You do not need to replace a working gas boiler with a heat pump.
THE GRANDFATHER CLAUSE — WHY ACTING EARLY MATTERS
Properties that achieve an EPC C under the current system before 1 October 2029 will be treated as compliant until that EPC expires — typically 10 years. This means if you get a C rating now, you may not need to worry about the new metrics until the mid-2030s.
For many Oxfordshire landlords, this is the most practical route. Current EPCs use the existing Energy Efficiency Rating, which many properties can reach C on with straightforward improvements like loft insulation, cavity wall insulation, and double glazing. The new system may be harder to pass, particularly for older Cotswold stone properties with solid walls.
WHAT YOU SHOULD DO NOW
- Get a current EPC assessment: If your EPC is more than a few years old, commission a fresh one to see where your property stands under the current methodology. If you can reach a C now, you lock in compliance under the grandfather clause
- Focus on fabric first: Regardless of which system you are assessed under, insulation and glazing improvements are the foundation. Loft insulation, cavity wall insulation, draught-proofing, and double glazing all count under both current and future metrics
- Consider solar panels: If you are unlikely to install a heat pump, solar PV plus a smart meter is the most cost-effective route to meeting the Smart Readiness metric under the new system
- Use the cost cap wisely: The government has set a £10,000 cost cap per property. Qualifying spend from 1 October 2025 counts towards this, so improvements you have already made may apply
- Check grant eligibility: The Boiler Upgrade Scheme offers up to £7,500 towards heat pump installation. The Warm Homes: Local Grant through Oxfordshire County Council may cover insulation and heating upgrades for eligible properties
FREQUENTLY ASKED QUESTIONS
Will I be forced to install a heat pump?
No. The government has confirmed landlords will not be forced to install heat pumps. You can choose to meet the Smart Readiness metric instead. Solar panels and a smart meter are typically sufficient for a C rating.
What happens if I cannot reach EPC C even after spending £10,000?
You can register a cost cap exemption, valid for 10 years, allowing you to continue letting the property.
When will the new EPC metrics launch?
The reformed HEM-based EPCs have been delayed to the second half of 2027. A specific date will be confirmed by summer 2026. The new metrics become the only assessment method from 1 October 2029.
Do current EPCs still count?
Yes. EPCs issued under the current system remain valid for 10 years. If your property holds a C rating on a current EPC issued before 1 October 2029, it will be treated as compliant until that certificate expires.
BOOK AN EPC ASSESSMENT
E8 Property Services helps Oxfordshire landlords plan the most cost-effective route to compliance. A fresh EPC now could lock in your rating under the grandfather clause before the new metrics arrive.
Book an EPC assessment or call 01865 339535 to discuss your property.
