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.
Featured Courses
Our most popular Energy Assessor qualifications

Self-Paced Domestic Energy Assessor Course | Guided Online Level 3 DEA Training

3-Day Online Domestic Energy Assessor Course | Live Level 3 DEA Training

2-Day Weekend Domestic Energy Assessor Course | Live Online Level 3 DEA Training
Upcoming Course Dates
Live availability across all our courses

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
Do you issue hard copy certificates?+
Awarding organisations now issue digital certificates for most qualifications, which are widely accepted by employers, accreditation schemes and other organisations throughout the UK.
Your digital certificate is secure, easy to store and can be downloaded and shared electronically whenever proof of your qualification is required.
If you would like a professionally printed hard copy, we can arrange this for an additional fee. Once your qualification has been fully signed off, you'll receive a sign-off email containing details of how to request a printed certificate and the applicable postage and administration charges.
If an official hard copy certificate is available from the awarding organisation, we'll provide you with all the available options in your sign-off email, allowing you to choose the option that best suits your needs.
What is the difference between Classroom, Online Live and Self-Study?+
All three training options lead to the same recognised qualification. The difference is simply how the training is delivered, allowing you to choose the learning style that best suits your schedule and preferences.
Classroom Training is ideal for learners who prefer face-to-face teaching in a traditional classroom environment. You'll attend our training centre, work alongside other learners and receive direct support from your tutor throughout the course. This option offers plenty of opportunities to ask questions and gain hands-on guidance.
Online Live Training delivers the same tutor-led experience remotely. You'll join your trainer and fellow learners in live, interactive sessions from the comfort of your home or office. You can ask questions in real time, take part in discussions and receive the same level of tutor support as classroom learners, without the need to travel.
Self-Study (Start Stop Learning) is designed for those who need maximum flexibility. You'll have access to all the learning materials through our online learner portal and can study whenever it suits you. If you need help, you can book video or telephone sessions with one of our tutors, giving you expert support while allowing you to learn entirely at your own pace.
Whichever option you choose, you'll receive the same high-quality training, ongoing tutor support and guidance to help you successfully complete your portfolio and achieve your qualification.
Is a Commercial Energy Assessor the same as a Non-Domestic Energy Assessor?+
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.
