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.

How much does Gas Safe registration cost in 2026?

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 before you pay. Treat it like insurance or van costs: a fixed overhead that belongs in your day-rate maths, not a surprise when the renewal email lands.

How much does an ACS reassessment cost?

Your Accredited Certification Scheme qualifications last five years, so reassessment is a less frequent but much 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. A fuller, multi-qualification reassessment runs higher, often £1,000 to £1,600.

Why do ACS quotes vary so much?

The biggest driver is how many appliance categories you carry: every unit on your ticket is another assessment to sit and pay for. Then there's whether you're buying assessment only or assessment bundled with training; assessment-only is cheaper, and if you're confident on the standards it's usually all you need. VAT quietly matters too: some colleges are exempt while commercial providers add it, which alone can swing a quote by hundreds. When you compare centres, get like-for-like quotes that list the exact categories, or you're comparing two different products.

How do you budget for the five-year cycle?

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 in the same month as a quiet patch or a van repair. Spread it instead. Even a reassessment at the top of the standard range works out around £20 a month across the five years, which is a rounding error against a single day's work. Set it aside from the start of the cycle and the reassessment year becomes just another year.

When should you book your reassessment?

Early, and in your own quiet season if you can. Booking months ahead means you choose the centre, the date and the price rather than taking whatever slot is left as the clock runs down, and it leaves room to re-sit calmly if anything goes wrong on the day. Write both dates down somewhere you'll actually see them, the annual registration renewal and the five-year ACS expiry, ideally in the same place you track customer renewals, because the engineer who reminds landlords about their gas safety dates for a living shouldn't be surprised by his own. It's exactly the kind of planning the summer lull is good for: check your expiry dates, get two or three quotes, and put the assessment in the diary before the autumn rush buries it.