Level 3 Certificate
Fully self-paced
A Retrofit Assessor course that fits around you
We have rebuilt the ABBE Level 3 Retrofit Assessor course as a fully self-paced online course. There are no classroom days and no cohort dates to plan around: you study online, at the times that suit you, and finish with the same nationally recognised certificate.
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Fully online
Study from wherever suits you. Everything is online.
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No classroom days
Nothing to attend. Work through the course entirely at your own pace.
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Up to three months
Once the course launches in December 2026, enrol any day. You have a maximum of three months to complete it.
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Built on your DEA
The natural next step for qualified Domestic Energy Assessors moving into retrofit.
Course details
How to become a Retrofit Assessor
To work as a Retrofit Assessor you need a Level 3 Domestic Energy Assessor qualification, then the Level 3 Certificate for Retrofit Assessor. This course gives you the second. Tap any section below to open it.
Course overview
PAS 2035 sets out how to assess homes for retrofit, identify improvement options, design and specify energy efficiency measures, and monitor retrofit projects. It came out of the Each Home Counts review and gives the industry a framework for whole-house retrofit of existing homes — work that is essential to cutting carbon emissions from housing.
The ABBE Level 3 Certificate for Retrofit Assessor covers the PAS 2035 Retrofit Assessor role. It gives you the knowledge, understanding and skills to assess a home and produce a condition report. That report is lodged on the TrustMark Data Warehouse, where Retrofit Coordinators and other stakeholders use it to progress retrofit projects.
The course is delivered by Unyte Academy, an ABBE approved centre based in Willenhall in the West Midlands. In 2026 alone, more than 150 Domestic Energy Assessors trained and passed with us.
Not a qualified DEA yet? Take the combined Domestic Energy Assessor and Retrofit Assessor course and get both qualifications for £1,499 + VAT.
Entry requirements
You must hold a Level 3 Domestic Energy Assessor (DEA) qualification before you start this course. It is the foundation the Retrofit Assessor role builds on.
Don’t have your DEA yet? Our self-paced Level 3 Domestic Energy Assessor course launches on 12 October 2026, or take the combined course for both.
Who this course is for
- Qualified Domestic Energy Assessors — move beyond EPCs into PAS 2035 retrofit assessment.
- People working in construction and the built environment — take a qualification that covers the Retrofit Assessor role.
- Anyone aiming for retrofit work — Retrofit Assessors work with housing associations, local councils, energy companies and private consultancies.
- Busy professionals — the course is fully self-paced, with no classroom days to fit in.
What the qualification covers
The ABBE Level 3 Certificate for Retrofit Assessor covers the whole PAS 2035 Retrofit Assessor role:
- The principles of PAS 2035, TrustMark and the Data Warehouse
- Retrofit energy efficiency advice
- Retrofit standards
- Retrofit risk assessment and its impact on assessors
- Building physiology
- Occupancy assessment
- Carrying out an appraisal of a dwelling
- Producing a condition report for a dwelling
How long does the Retrofit Assessor course take?
The course is fully self-paced, and you have a maximum of three months from enrolment to complete it. You decide how quickly you work through it within that time.
How it's delivered
The Retrofit Assessor course is fully self-paced and online. There are no classroom days: you work through the course at your own pace, whenever it suits you, within three months.
Pre-order your place
Secure your place now, ready for launch in December 2026.
Study online at your pace
No classroom days and no cohort dates to work around.
Gain your certificate
The ABBE Level 3 Certificate for Retrofit Assessor.
Certification: on successful completion you receive the ABBE accredited Level 3 Certificate for Retrofit Assessor, covering the PAS 2035 Retrofit Assessor role.
Apply
Pre-order your Retrofit Assessor course
Send your details to pre-order your place. We will confirm your place and be in touch before the course launches in December 2026. We reply within one working day.
Careers and progression
What does a Retrofit Assessor do?
A Retrofit Assessor evaluates homes to work out which retrofit measures are suitable. They collect and analyse information on the building fabric, how the home is occupied and how it uses energy, and that assessment is what the rest of a retrofit project is planned from.
Retrofit Assessors work with housing associations, local councils, energy companies and private consultancies, and play a vital role in improving the energy efficiency of existing homes.
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Entry requirement · Level 3
Certificate for Domestic Energy Assessor
Produce EPCs for existing homes. You need this before you start.
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You are here · Level 3
Certificate for Retrofit Assessor — ABBE
Carry out the PAS 2035 assessments that a retrofit project is planned from.
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Next step · Level 5
Diploma in Retrofit Coordination and Risk Assessment
Run retrofit projects end to end as the accountable coordinator.
Need both assessment qualifications? Take the combined Domestic Energy Assessor and Retrofit Assessor course. New to the sector? Start with the Level 2 Award in Understanding Domestic Retrofit.
Spread the cost
Pay in 3 interest-free instalments
Split your course fee into three payments, with no interest and nothing extra to pay.
- Payment one0% interest
- Payment two0% interest
- Payment three0% interest
Launching December 2026
Pre-order now: £695 + VAT
Secure your place on the new fully self-paced Retrofit Assessor course before it launches.
- Launching December 2026 — pre-order now to secure your place.
- Fully self-paced — no classroom days, and up to three months to complete.
- Not a DEA yet? — get both qualifications on the combined course for £1,499 + VAT.
£695
+ VAT per learner
The ABBE Level 3 Certificate for Retrofit Assessor, fully self-paced.
Pre-order Your PlaceApproved and accredited by
Common questions
Retrofit Assessor course FAQs
A Retrofit Assessor evaluates homes to work out which retrofit measures are suitable. They collect and analyse information on the building fabric, how the home is occupied and how it uses energy. That assessment is what a PAS 2035 retrofit project is planned from.
You need a Level 3 Domestic Energy Assessor (DEA) qualification before you can start this course. If you don’t have one yet, our combined DEA and Retrofit Assessor course gives you both for £1,499 + VAT.
Yes. The course is fully online and self-paced, with no classroom days to attend. You work through it at your own pace, whenever it suits you.
It is fully self-paced, and you have a maximum of three months from enrolment to complete it. You decide how quickly you work through it within that time.
The new self-paced Retrofit Assessor course launches in December 2026. You can pre-order your place now at £695 + VAT.
The course is £695 + VAT per learner. Everyone can pay in 3 interest-free instalments.
You can carry out PAS 2035 retrofit assessments and produce condition reports. These are lodged on the TrustMark Data Warehouse, where Retrofit Coordinators and other stakeholders use them to progress retrofit projects.
Retrofit Assessors work with housing associations, local councils, energy companies and private consultancies, carrying out the assessments that retrofit projects to improve the energy efficiency of existing homes are planned from.
The next step is the Level 5 Diploma in Retrofit Coordination and Risk Assessment, which prepares you to run retrofit projects end to end as the Retrofit Coordinator.
Related courses
Before and after this course
Combined course
Domestic Energy Assessor and Retrofit Assessor
Level 5 Diploma
