0203 488 2554 training@ozonegroup.co.uk

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
5.0Google Rating
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
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Featured Courses

Our most popular Energy Assessor qualifications

Why Ozone

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

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.

What is the difference between the 3-Day Online DEA course and the 2-Day Weekend DEA course?+

Both courses cover exactly the same Level 3 Domestic Energy Assessor syllabus and lead to the same recognised qualification. The training materials, assignments, portfolio requirements and assessment criteria are identical.

The only difference is how the training is scheduled.

The comparison below shows the difference between the two delivery options.


3-Day Course (Weekdays)2-Day Course (Weekend)
DaysMonday – WednesdaySaturday – Sunday
Start Time9:30 am8:30 am
Finish Time3:30 pm5:30 pm
Daily Training Hours6 Hours9 Hours
Total Duration3 Days2 Days

As you can see, the weekend course has longer training days, allowing us to cover the same syllabus in just two days. No topics are omitted or shortened, and every learner receives the same training materials, tutor support and guidance.

Whichever option you choose, you'll complete the same assignments and portfolio before achieving the same recognised qualification.

If weekdays are difficult because of work or other commitments, the 2-day weekend course offers a convenient way to complete your training without taking time off.

What if I fail an assignment?+

There's no need to worry. We don't expect every assignment to be perfect the first time.

If your assessor feels that an assignment needs further work, they'll provide clear, constructive feedback explaining what needs to be improved. You'll then have the opportunity to make the required changes and resubmit your work.

There is no limit on the number of resubmissions, so you can continue improving your assignments until they meet the required standard. Our goal is to help you understand the subject and successfully complete your qualification, not to catch you out.

Throughout the process, you'll have access to tutor support whenever you need it. If you're unsure about any feedback or need additional guidance, your tutor will be happy to explain what's required and help you move forward with confidence.

We believe learning should be supportive rather than stressful, which is why we work with you every step of the way until you've successfully completed your portfolio and achieved your qualification.

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.