Gas Safe registration and ACS costs in 2026

For 2026/27, Gas Safe Register's annual online renewal for a single-engineer business is around £139.78 plus VAT (about £168 including VAT), with extra for a physical ID card or additional engineers. A domestic ACS reassessment typically runs from about £650 to £1,160 including VAT. Registration renews every year; ACS lasts five.

Gas Safe registration

Gas Safe registration is an annual cost. For 2026/27 the online business renewal is around £139.78 plus VAT for a single-engineer business. The scheme has moved to digital-by-default, so a physical ID card is an optional extra (about £16 plus VAT), and each additional registered engineer adds roughly £44 plus VAT. These figures come from Gas Safe's own trade communications; the register's fee page is the place to confirm your exact renewal.

ACS reassessment

Your Accredited Certification Scheme qualifications last five years, so reassessment is a less frequent but bigger cost. A standard domestic reassessment, the core CCN1 plus common appliance units like cookers, fires and water heaters, typically comes in around £650 to £1,160 including VAT, depending on the provider and how many appliance categories you carry. A fuller, multi-qualification reassessment runs higher, often £1,000 to £1,600. Assessment-only is cheaper than an assessment bundled with training, and some colleges are VAT-exempt while commercial providers add VAT.

Budgeting for it

The trap is that these costs are lumpy: a modest annual registration fee, then a much larger ACS bill every five years that's easy to forget until it lands. The engineers who don't get caught out set aside a little each month toward the reassessment year, and book it early rather than in a panic as the clock runs down. It's exactly the kind of thing the quiet season is good for planning.