Commercial Gas Registration & Qualifications
Gas Safe registration for commercial work, ACS commercial categories, and how to check a commercial gas engineer is qualified for the job.
Commercial gas work is split into competence categories. An engineer who is registered for domestic boilers is not automatically allowed to work on a restaurant cookline, a plant room boiler or a 100 mm gas main. What they may legally do depends on the categories shown on their Gas Safe Register ID card.
These guides explain how commercial registration works, what the main ACS categories cover, and how building owners and facilities managers can check an engineer before letting them on site.
Guides in this section
- Commercial Gas Safe Registration Explained
How Gas Safe registration works for commercial (non-domestic) gas work and why the categories on an engineer's card matter.
- ACS Commercial Gas Categories: What Each One Covers
A plain-English guide to the main ACS non-domestic categories: core safety, pipework, testing and purging, catering, boilers and heaters.
- How to Check a Commercial Gas Engineer Is Qualified
The checks building owners and facilities managers should make before a commercial gas engineer starts work.
- How to Become a Commercial Gas Engineer
The typical routes into commercial gas work, from domestic engineer to commercial ACS categories.