Gas Safety Certificate cost: what landlords pay in 2026
A gas safety certificate — the CP12 — is the document every UK landlord needs once a year. Here's what it actually costs in 2026, why prices vary, and how to make sure you're not being charged twice.
Typical CP12 prices in 2026
- One appliance (e.g. combi boiler only): £55 – £85
- Two appliances (boiler + hob): £75 – £110
- Three appliances: £95 – £140
- HMO / multiple flats: Quoted per property, usually with a portfolio discount.
GetCerted's Gas Safety Certificate is a flat £60, plus £10 per gas appliance — so a one-appliance flat is £70 and a typical 2-appliance terrace is £80. Fixed before the engineer arrives. Book here.
What's included in a CP12?
Not sure what the document itself is? Start with our plain-English guide to the CP12 certificate. On the visit, a Gas Safe registered engineer will:
- Visually inspect every gas appliance (boiler, hob, gas fire) for safe operation and adequate ventilation.
- Test gas tightness on the supply pipework.
- Check flues and chimneys for correct operation.
- Confirm a working CO alarm is in place where required.
- Issue a CP12 certificate — one copy for you, one for the tenant within 28 days.
What can bump the price up
- Number of appliances. Each additional gas appliance adds time and a separate inspection record.
- Access. Boxed-in pipework, locked cupboards or an inaccessible meter all add time.
- Out-of-hours bookings. Evening or weekend slots often carry a 20–30% premium.
- Repairs. If an engineer finds a fault and you ask them to fix it on the same visit, parts and labour are extra — always quoted before they touch anything.
How often do I need one?
Every 12 months. Best practice is to book 4–6 weeks before expiry to give yourself a buffer. Read more about the CP12.
Boiler service vs gas safety check — what's the difference?
A gas safety check confirms the appliance is safe. A boiler service goes further and cleans, calibrates and maintains the appliance to keep it efficient. Many landlords bundle the two on the same visit — cheaper and only one tenant access.
Gas safety in Blackpool, Lytham and the Fylde
Coastal exposure is hard on flues and CO alarms. We see more borderline ventilation findings in St Annes seafront conversions than anywhere else in the Fylde, and recommend annual rather than 12-monthly inspection where you can. Book gas safety in Blackpool.