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
Limited places available – book early to secure your spot!
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
View →Upcoming Course Dates
Live availability across all our courses
Luton
17 August 2026
4-Day Classroom Domestic Energy Assessor Course | Level 3 DEA Training
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

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
Real reviews from our Google profile
Frequently Asked Questions
Can I assess every commercial building after qualifying?+
Not necessarily. Your permitted scope depends on your qualification and accreditation level. More complex buildings may require higher-level competence or different modelling methods.
Do I Need Previous Construction Experience?+
Not necessarily. Previous experience in construction, surveying, engineering or property can be helpful, but it is not always required. You will still need to complete the appropriate Non-Domestic Energy Assessor qualification and demonstrate the required competence. Relevant industry experience may allow some learners to follow a faster training route or receive recognition for prior learning. Entry requirements vary, so check the requirements of the specific course before enrolling.
Do I need prior experience?+
No prior experience required. You need good literacy/numeracy and basic IT skills.
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.
