Build Your Career inEnergy Assessment & Building Compliance
City & Guilds approved training in Domestic EPCs, Retrofit, SAP, Non-Domestic Energy Assessment and more. Flexible learning. Expert tutors. Real-world support.
Expert Tutors
Learn from industry professionals
Flexible Learning
Classroom, online live & guided learning
Practical Support
Assignments & portfolio guidance included
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500+ Learners Trained in Just Last Year
Ongoing Portfolio Support
City & Guilds Approved Centre
Industry-recognised UK qualification
Experienced Tutors
Taught by working assessors
Online Learning Materials
Comprehensive study resources & portal access
Portfolio Support
Hands-on assignment guidance
Upcoming Course Dates
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Join 1000+ successful
assessors trained with us!
Featured Courses
Our most popular Energy Assessor qualifications
Domestic
Self-Paced Domestic Energy Assessor Course | Guided Online Level 3 DEA Training
Train to become a Domestic Energy Assessor with our fully online, self-paced Level 3 DEA course. Start immediately, study around your commitments and schedule video or audio calls with your tutor whenever you need support.
£899£849 +VAT
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Domestic
3-Day Online Domestic Energy Assessor Course | Live Level 3 DEA Training
Become a qualified Domestic Energy Assessor in just three days with our live online Level 3 DEA course. Attend interactive Zoom sessions led by experienced trainers, then complete your portfolio with ongoing tutor support and access to our online learning portal.
£899£849 +VAT
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Domestic
2-Day Weekend Domestic Energy Assessor Course | Live Online Level 3 DEA Training
Train to become a qualified Domestic Energy Assessor without taking time off work. Compress the theory and EPC software training into a single weekend with our live tutor-led Level 3 DEA course, delivered on Saturday and Sunday from 08:30 to 17:30, followed by ongoing tutor support and access to our online learning portal.
£899£849 +VAT
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Live availability across all our courses
Zoom
31 August 2026
Level 3 & 4 Commercial Energy Assessor (Non-Domestic Energy Assessor – NDEA) Course | Live Online Training
Zoom
19 September 2026
2-Day Weekend Domestic Energy Assessor Course | Live Online Level 3 DEA Training
Zoom
21 September 2026
3-Day Online Domestic Energy Assessor Course | Live Level 3 DEA Training
Zoom (Face to Face Online)
24 September 2026
Level 4 Certificate in Retrofit Assessment | Live Online Training
Zoom
19 October 2026
Level 3 & 4 Commercial Energy Assessor (Non-Domestic Energy Assessor – NDEA) Course | Live Online Training
Zoom
26 October 2026
3-Day Online Domestic Energy Assessor Course | Live Level 3 DEA Training
Why Choose Ozone Training
We're working Energy Assessors who train new assessors — not a generic training company.
- Run by practising DEAs since 2011
- City & Guilds approved courses
- Real-world tips, not just exam-pass content
- Spread cost in interest-free instalments
- 100% pass guarantee with free re-sits
What Our Learners Say
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Frequently Asked Questions
Is a Commercial Energy Assessor the same as a Non-Domestic Energy Assessor?+
Yes. The terms are commonly used to describe the same profession. Non-Domestic Energy Assessor is the formal industry title, while Commercial Energy Assessor is often easier for customers to understand.
Do I need prior experience?+
No prior experience required. You need good literacy/numeracy and basic IT skills.
Is the qualification recognised in the UK?+
Yes. Our courses are City & Guilds approved and recognised by all UK accreditation schemes.
Ready to start your DEA career?
Speak to our team or book your course today. We'll guide you from enrolment to your first paid EPC.