The UK EPC system is changing in 2027. Learn about the four new energy metrics, the Home Energy Model, and what the reforms mean for homeowners and landlords.
The Current Context
The UK Energy Performance Certificate (EPC) system is changing in 2027, introducing a new multi-metric rating designed to better measure how homes actually perform. Instead of a single EPC score based largely on energy costs, the new system will assess homes across four separate performance metrics, covering fabric efficiency, heating systems, smart readiness, and energy costs.
Whether you are looking to lower your energy bills or increase your property’s value, understanding these new benchmarks is the first step toward a more efficient home.
Why the Change? Moving Beyond Cost
The traditional EPC system relied heavily on an Energy Efficiency Rating (EER) based on energy costs. This created a “heat pump penalty,” where installing low-carbon electric heating could actually lower a home’s EPC score because electricity has historically been more expensive than gas. The 2027 reforms fix this by separating cost from performance, rewarding genuine decarbonisation and home comfort.
Deep Dive: The 4 New Headline Metrics
Targeting launch in late 2027, new-style EPCs will feature four distinct metrics to give a comprehensive view of your home:
1. Fabric Performance Metric
- What it measures: How well your home physically retains heat (walls, roof, floor, and windows).
- Key factors: It uses the Fabric Energy Efficiency (FEE) methodology, which simulates heat flow over an entire year to determine heating and cooling demand.
- Top scores: To achieve a high rating here, focus on insulation and high-quality glazing.
2. Heating System Metric
- What it measures: The efficiency and environmental impact of your heating and hot water systems.
- Key factors: Fossil fuel systems, like traditional gas boilers, cannot achieve a Band C or higher on this metric.
- Top scores: These are reserved for electric heat pumps and low-carbon heat networks.
3. Smart Readiness Metric
- What it measures: A building’s ability to integrate with a flexible energy grid to lower bills and optimise energy consumption.
- Key factors: The inclusion of solar PV, home battery storage, thermal energy storage, and bidirectional EV charging points.
- Top scores: A smart electricity meter is mandatory to achieve a Band C or above, as it is the foundation for accessing flexible tariffs and smart services.
4. Energy Cost Metric
- What it measures: An independent estimate of the predicted annual energy bills for a building, covering space heating, hot water, lighting, and fans.
- Key factors: It assesses the cost of your home’s total energy demand.
- Top scores: This metric is reported in actual annual pounds (£) rather than an A-G band to provide instant clarity for occupants.
Financial Benefits: Value, ROI, and Savings
Improving your home’s energy performance is an investment that often pays for itself through increased property value and lower utility bills. We have analysed this further in our recent blog post. This means optimising for metrics can be good for your wallet, as well as the planet.
At Green Home Guide, our tool analyses this in detail, providing you with tailored recommendations for your property.
The Home Energy Model (HEM) and SMETERs
The 2026 transition also includes an overhaul of the underlying methodology. The Home Energy Model (HEM) replaces the old Standard Assessment Procedure (SAP).
- Dynamic Data: The HEM model estimates energy use every 30 minutes rather than monthly (SAP), giving a much clearer picture of how smart technology and renewables affect your home.
- Real-World Measurement: Homeowners can voluntarily supplement their EPC with SMETER (Smart Meter Enabled Thermal Efficiency Ratings) data. This uses actual smart meter and temperature readings to calculate your home’s “in-situ” performance rather than relying solely on theoretical models.
Implementation Timeline
- Late 2027: Official launch of new-style EPC certificates featuring the 4 headline metrics.
- 1 October 2029: The deadline to “bank” an EPC Band C under the current system, which will be honored as compliant for a limited time for specific regulatory needs such as the Minimum Energy Efficiency Standards (MEES) for rentals.
Your Action Plan
Given that your EPC rating can affect both property value and regulatory compliance, it may be wise to secure a higher rating under the current, well-understood system rather than risk uncertainty under the new methodology. This is particularly relevant for landlords and anyone planning to sell in the next few years. A Green Home Guide shows you exactly which improvements are most likely to boost your EPC rating.
Key Sources
For full transparency and further technical details, you can reference the official government policy documents used for this guide:
