An EPC assessment is a 30–60 minute non-invasive property inspection
An Energy Performance Certificate (EPC) assessment is a visual survey of your home’s energy efficiency. The assessor measures the property’s dimensions, checks insulation, heating systems, windows, and lighting.
An EPC assessment costs £60–£120 and takes 30–60 minutes for a 3-bed home. The assessor visually checks insulation, heating, windows, and lighting without moving furniture. Your rating is calculated using the SAP 2012 model and stays valid for 10 years.
- Book a 30–60 minute non-invasive visual survey for a 3-bed home.
- Assessors check insulation, heating, windows, and lighting only.
- Your EPC rating uses the SAP 2012 model for a 1–100 score.
- Average UK home scores band D (55–68) on the scale.
- An EPC costs £60–£120 and stays valid for 10 years.
- An EPC assessment is a 30–60 minute non-invasive property inspection
- The assessor will examine your heating system, insulation, and windows
- Your EPC rating is based on a Standard Assessment Procedure (SAP) calculation
- Quick numbers typical EPC ratings, costs, and validity period
- Who qualifies for government grants depends on your EPC rating and household income
- The direct answer an EPC assessment is a property survey that produces a rating and a recommendations report
- You must use an accredited assessor registered with an approved certification scheme
- Your EPC rating can be improved before an assessment with low-cost measures
They do not move furniture, lift carpets, or access crawl spaces unless safety permits. The visit is booked in advance and typically takes 30–60 minutes for a three-bedroom home, according to the Energy Saving Trust (Energy Saving Trust, 2026).
The assessor will examine your heating system, insulation, and windows
The boiler or heat pump age, type, and efficiency are recorded. Condensing boilers score higher than non-condensing models. Loft and wall insulation thickness and condition are checked. Cavity wall insulation requires access to the wall cavity via drilled holes, which the assessor may note but not install.
Double or triple glazing is noted. Single glazing or poorly sealed windows reduce the rating. The assessor also records the proportion of low-energy lighting in the property. Ofgem’s guide for homeowners confirms these checks (GOV.UK, 2026).
Your EPC rating is based on a Standard Assessment Procedure (SAP) calculation
The SAP 2012 model converts physical measurements into a 1–100 score for energy efficiency and CO2 emissions. The primary factors are building fabric (walls, roof, floor), heating system efficiency, and lighting.
The final rating is shown as a band from A (92–100) to G (1–20). The average UK home is at band D. The Department for Energy Security and Net Zero publishes the SAP 2012 methodology (DESNZ, 2026).
Quick numbers typical EPC ratings, costs, and validity period
| Item | Typical value | Source |
|---|---|---|
| Average UK EPC rating | Band D (55–68) | ONS, 2024 (latest data) |
| Cost of an EPC assessment | £60–£120 | Energy Saving Trust, 2026 |
| EPC validity period | 10 years | GOV.UK, 2026 |
| Typical loft insulation savings | Up to £315/year on heating bills | Energy Saving Trust, 2026 |
| Minimum rating for most grants | Band D or E | GOV.UK, 2026 |
Who qualifies for government grants depends on your EPC rating and household income
The Great British Insulation Scheme (GBIS) is open to homes with an EPC rating of D, E, F, or G and a household income under £31,000 (or receiving certain benefits). The Boiler Upgrade Scheme (BUS) requires an EPC rating of D or above for heat pump grants.
Homeowners with an EPC rating of A, B, or C generally do not qualify for means-tested energy-efficiency grants. Full eligibility details are on the official scheme pages (GOV.UK, Great British Insulation Scheme and GOV.UK, Boiler Upgrade Scheme).
how to check your EPC rating online
The direct answer an EPC assessment is a property survey that produces a rating and a recommendations report
The assessment involves a visual check of the building fabric, heating, and lighting, not invasive testing. The output is a 1–100 score (band A–G) and a list of costed improvement measures.
The report is legally required when selling or renting a property, and for many grant applications. GOV.UK provides a summary of what an EPC contains (GOV.UK, 2026).
You must use an accredited assessor registered with an approved certification scheme
Only assessors from schemes like Elmhurst Energy, Stroma, or Quidos can issue valid EPCs for England, Wales, and Scotland. Check the assessor’s membership number on the official register at epcregister.com (England/Wales) or scottishepcregister.org.uk (Scotland).
For grants, the installer (e.g., for insulation or heat pumps) must be MCS-certified or TrustMark-registered. GOV.UK provides a tool to find an energy assessor (GOV.UK, 2026). MCS lists certified installers on its website (MCS, 2026).
Your EPC rating can be improved before an assessment with low-cost measures
Adding 270mm loft insulation (if currently less) is the cheapest single improvement, costing around £300–£500. Replacing old incandescent bulbs with LEDs costs under £50 and can raise the lighting score.
If the boiler is over 15 years old, upgrading to an A-rated condensing boiler can improve the heating score by 5–10 points. The Energy Saving Trust provides guidance on cost-effective improvements (Energy Saving Trust, 2026).
loft insulation grants available in 2026
Frequently Asked Questions
An assessor checks your heating system, loft and wall insulation, windows, and low-energy lighting. They record dimensions and efficiency details but do not move furniture or lift carpets, as confirmed by the Energy Saving Trust.
A typical EPC assessment takes 30–60 minutes for a three-bedroom home. Larger or more complex properties may take longer, according to GOV.UK guidance.
An EPC assessment costs between £60 and £120 for a standard home, as reported by the Energy Saving Trust in 2026. Prices vary by property size and location.
The average UK home has an EPC rating of band D, scoring between 55 and 68 on the SAP scale. This data comes from the ONS 2024 report.
An EPC certificate is valid for 10 years from the date of assessment. GOV.UK confirms this validity period for all properties in England and Wales.
