Energy Performance Certificates (EPCs) Explained
Everything homeowners, landlords, and buyers need to know — what an EPC is, why it matters, and what the law requires.
What Is an EPC?
An Energy Performance Certificate (EPC) is an official document that rates how energy-efficient a property is. Introduced across the UK in 2007, it gives every property a score from 1 to 100 and a corresponding letter grade from A (most efficient) to G (least efficient).
The certificate also estimates typical energy costs for the property per year and sets out a list of recommended improvements — such as loft insulation, a new boiler, or better glazing — along with how much each measure could save and what it would cost to install.
EPCs are legally required in England and Wales whenever a property is built, sold, or rented out. They must be produced by an accredited Domestic Energy Assessor (DEA) and lodged on the national EPC register, where they are publicly accessible.
EPC Rating Scale
SAP (Standard Assessment Procedure) score
What Information Does an EPC Contain?
An EPC is more than just a letter — it's a detailed snapshot of a property's energy profile.
Energy Efficiency Rating
The current A–G rating based on how much energy the property uses. A separate "potential" rating shows what could be achieved if all recommendations were implemented.
Estimated Energy Costs
An annual estimate of heating, hot water, and lighting costs based on the property's characteristics and standard occupancy assumptions.
Improvement Recommendations
A prioritised list of energy-saving measures, the estimated cost of each, and how much each could save annually and over the certificate's lifetime.
Property Details
Construction type, floor area, number of floors, property age, and the type of heating and hot water system in place.
Environmental Impact
A separate CO₂ emissions rating showing the property's environmental impact — rated A (lowest emissions) to G (highest).
Validity & Register Reference
The issue date, 10-year expiry, and a unique reference number that allows anyone to look up the certificate on the national EPC register.
When Do You Need an EPC?
The law is clear — an EPC must be in place before you market or begin construction of a property.
Selling a Property
- Required before the property is marketed — not at completion.
- Must be made available to prospective buyers free of charge.
- No minimum rating is required to sell.
- Estate agents are legally obliged to display the rating in listings.
Renting a Property
- Required before marketing to prospective tenants.
- Must be given to the tenant at the start of the tenancy.
- Minimum rating of E — F and G properties cannot legally be let.
- Failure to provide an EPC can invalidate a Section 21 notice.
Building a Property
- Required on completion before the building is occupied.
- New builds must meet Part L building regulations energy standards.
- Developer is responsible for obtaining and registering the certificate.
- Forms part of the handover documentation for the buyer or tenant.
What Affects Your EPC Rating?
Your rating is calculated using government-approved Standard Assessment Procedure (SAP) software, which weighs dozens of factors about the physical property.
Heating system
Boiler type, age, fuel source (gas, oil, heat pump), and heating controls all have a major influence on the score.
Insulation
Loft, wall (cavity or solid), and floor insulation are among the highest-impact factors. Poor insulation means heat escapes quickly and costs more to replace.
Windows and doors
Double and triple glazing dramatically reduces heat loss compared to single-glazed windows. The frame material and draught-proofing also count.
Hot water system
Whether you have a hot water cylinder, its insulation, and how efficiently it is heated all contribute to the score.
Renewable energy
Solar PV panels, solar thermal systems, and heat pumps can significantly improve a rating by generating or using energy more efficiently.
Lighting
The proportion of fixed light fittings with energy-efficient bulbs (LED) is factored into the SAP calculation.
Property size and age
Larger properties generally need more energy to run. Older properties often have less insulation and less efficient systems by default.
Wall construction
Solid walls lose heat far more quickly than cavity walls with insulation — and they are also much more expensive to retrofit.
The MEES 2030 Deadline — What Landlords Need to Know
Minimum Energy Efficiency Standards are changing. Landlords need to act now.
Right Now
EPC E or above required
All privately rented homes in England and Wales must already meet this standard. You cannot legally start or continue a tenancy below this threshold.
Proposed: 2030
EPC C required for all rentals
The government has proposed raising the minimum to EPC C by 2030 for all tenancies. Legislation is expected — landlords should plan upgrades now.
Non-Compliance
Fines up to £30,000
Landlords who let below the required standard face significant financial penalties per property, plus potential issues with licensing and insurance.
Want the full breakdown?
Our in-depth blog covers the MEES 2030 timeline, what it means for your portfolio, exemptions, and how to prepare.
EPCs for Homeowners vs Landlords
Homeowners Selling
- No minimum EPC rating is needed to sell — but you must have a valid certificate before listing.
- A higher rating can increase buyer confidence and, in some markets, the sale price. Buyers are increasingly aware of running costs.
- If you've made improvements since your last EPC (new boiler, insulation, windows), consider getting a new one — it could reflect a meaningfully better rating.
- Your estate agent is legally required to display the EPC rating on all marketing materials.
- If your EPC is over 10 years old, you'll need a fresh one before you can sell.
Landlords & Investors
- You cannot legally let a property rated F or G. It must be improved to at least an E before any tenancy begins.
- A copy of the EPC must be given to every new tenant at the start of their tenancy. Failure to do so can prevent you serving a valid Section 21 notice.
- If you manage a portfolio, track EPC expiry dates carefully — a lapsed certificate means you cannot legally re-let the property.
- With the proposed 2030 EPC C requirement approaching, now is the time to assess your portfolio and plan any necessary upgrades before costs and demand for contractors increase.
- Certain improvements — like cavity wall insulation or loft insulation — can dramatically raise the rating at relatively low cost.
Common Questions
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