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To work on gas legally in the UK you must be on the Gas Safe Register. The usual route is a recognised training programme, then the ACS assessments starting with CCN1 plus your appliance categories, then Gas Safe registration. Going self-employed also means public liability insurance, tools, a van, and a way to quote and invoice.
Reviewed by Jordan Valentine-Dunn, Gas Safe registered engineer · Portsmouth Gas Heating · Last reviewed July 2026
To work on gas legally anywhere in the UK, you must be on the Gas Safe Register. Getting there is a training-and-assessment route rather than a single exam, and going self-employed adds a business on top of the qualification.
Either a Managed Learning Programme, or an NVQ combined with an on-site portfolio of real work, so you build assessed experience, not just classroom hours.
The Accredited Certification Scheme starts with CCN1 (Core Domestic Gas Safety), plus the appliance categories you'll work on, such as boilers, cookers and fires.
Initial registration is around £368 including VAT, with a three-month probation period and an annual renewal after that. You can only legally work on gas once registered.
On top of the qualification, working for yourself means public liability insurance, your own tools, test equipment and a van, and a reliable way to quote, invoice and keep records. Costs and exact requirements vary, so treat this as a general overview and check the current details with Gas Safe Register before you commit.
Last reviewed July 2026. This guide is general information, not legal or safety advice, gas safety work must be carried out by an appropriately Gas Safe registered engineer. Rules can change, so check the linked official sources for the current position.