How long to become a Domestic Energy Assessor?

Around 3 days of live training plus a portfolio of five EPCs; most complete within weeks.

Is DEA the same as Retrofit Assessor?

No. DEA (Level 3) produces EPCs; Retrofit Assessor (Level 4) adds PAS 2035 assessment.

Domestic Energy Assessor Courses in the UK

Domestic Energy Assessors (DEAs) produce Energy Performance Certificates (EPCs) for existing homes. It is the entry qualification for a retrofit career. This guide covers the route.

Last reviewed: August 2026

What a DEA does

DEAs survey dwellings and produce EPCs using RdSAP. The certificate underpins retrofit eligibility (e.g. ECO4 requires bands D–G) and the Home Energy Model transition.

Qualification

The Level 3 Certificate in Domestic Energy Assessment is delivered over ~3 days live online plus a portfolio of five EPCs and knowledge tests.

Cost and route on

DEA courses cost roughly £990–£1,590 depending on format. Most learners add the Retrofit Assessor award to work on PAS 2035 projects.

FAQs

How long to become a Domestic Energy Assessor?: Around 3 days of live training plus a portfolio of five EPCs; most complete within weeks.
Is DEA the same as Retrofit Assessor?: No. DEA (Level 3) produces EPCs; Retrofit Assessor (Level 4) adds PAS 2035 assessment.