If you’re selling, renting, or managing a property, an Energy Performance Certificate (EPC) is a legal requirement. One of the most common questions property owners ask is how long an EPC assessment takes and what actually happens during the process.
With EPC enforcement tightening in 2026, understanding the assessment process helps you prepare properly, avoid delays, and ensure full compliance.
How Long Does an EPC Assessment Take?
The duration of an EPC assessment depends on the property type, size, and complexity.
Typical EPC Timescales
Domestic Properties
Small flat or studio: 30–40 minutes
Terraced or semi-detached house: 45–60 minutes
Large or detached home: 60–90 minutes
Commercial Properties
Small commercial unit: 1–2 hours
Larger or complex buildings: 2–4 hours or more
In most cases, the EPC certificate is issued within 24–48 hours of the assessment.
If you need an EPC quickly, you can arrange a fast appointment through EPCRate’s booking system:
👉 https://epcrate.co.uk/booking/
What Happens During an EPC Assessment?
An EPC assessment is non-invasive and focuses on visible energy-related features of the property. There is no drilling, testing, or disruption.
Step-by-Step EPC Assessment Process
Step 1: Booking a Qualified EPC Assessor
A certified and accredited assessor arranges a visit at a convenient time. EPCRate works with experienced EPC assessors across London, ensuring accurate, regulation-compliant assessments.
Learn more about the company here:
👉 https://epcrate.co.uk/about-us-epc-company-london/
Step 2: On-Site Property Inspection
The assessor visually inspects key energy-efficiency elements, including:
Property size and layout
Wall construction (solid or cavity)
Roof type and insulation evidence
Windows and glazing
Heating and hot water systems
Fixed lighting efficiency
Photographic evidence may be collected to meet audit requirements.
Step 3: Measurements and Data Collection
The assessor measures internal dimensions and records details that affect energy performance, such as heat-loss areas and construction methods.
Providing documents like boiler manuals or insulation certificates (if available) can improve the accuracy of your EPC, but they are not mandatory.
Step 4: Energy Modelling and Calculation
After the visit, all collected data is entered into government-approved EPC software (RdSAP or SBEM).
This software calculates:
Energy efficiency rating (A–G)
Estimated running costs
Environmental impact score
Step 5: EPC Report and Recommendations
Your EPC report will include:
Current energy rating
Potential rating after improvements
Recommended upgrades and estimated savings
These recommendations are particularly important for landlords working towards Minimum Energy Efficiency Standards (MEES) in 2026.
To understand EPC pricing before booking, view EPCRate’s transparent costs here:
👉 https://epcrate.co.uk/pricing/
Step 6: Certificate Issued and Registered
Once finalised:
The EPC is uploaded to the national EPC register
A digital copy is provided to the owner or agent
The certificate remains valid for 10 years
EPCRate provides both domestic and commercial EPCs through its professional assessor network:
👉 https://epcrate.co.uk/services-epc-assessors-london/
Does an EPC Assessment Cause Disruption?
No. EPC assessments are:
Quick and straightforward
Non-intrusive
Safe to carry out while the property is occupied
No utilities are switched off, and no fixtures are damaged.
What Happens After You Receive Your EPC?
Your EPC allows you to:
Legally sell or rent your property
Demonstrate compliance with EPC regulations
Share documentation with estate or letting agents
Plan energy-efficiency upgrades
Properties rated F or G may require improvement before being rented out.
If you need advice after receiving your EPC, EPCRate’s team can help:
👉 https://epcrate.co.uk/contact-us-epc-services-london/
