Cost guides
What gas, heating and plumbing work costs. The table shows what InstaGasWorks charges today; the guides explain what affects a price and what to ask when you compare quotes.
What InstaGasWorks charges
| Job | Price |
|---|---|
| Basic boiler service | £120 |
| Full boiler serviceHeat exchanger stripped and cleaned | £225 |
| Landlord gas safety certificate (CP12)One appliance, then £35 each | £79 |
| CP12 with a basic boiler serviceBoth on one visit | £170 |
| Breakdown visit, first hour on weekdaysThen £100 an hour; other days on the rates page | £120 |
| Emergency call-out, weekdays 8am to 6pm£220 at other times | £180 |
| Powerflush, up to 6 radiators | £499 |
| New combi boiler, fittedAfter a free survey | From £2,499 |
These are the prices on the service pages today, the same in every area covered. The guides below were written about London prices in general and can quote different figures: where they differ, this table is what InstaGasWorks charges. The rates page has the labour rate for every day and time.
Servicing and certificates
Boiler Service London: Costs & Booking Guide 2026
What a boiler service costs in London, the difference between a basic and a full service, what moves the price, how to compare quotes and how to book a Gas Safe engineer.
4 min read, ReadGas Boiler Service London: 2026 Checklist & Prices
Gas boiler service London prices, the full annual checklist, and what a Gas Safe engineer really checks. See typical 2026 costs and book your service today.
15 min read, ReadCP12 Certificate London: A Landlord's Complete Guide
What London landlords must do about gas safety: the yearly CP12 check, what it covers, deadlines and records, what affects the cost, and how it differs from a boiler service.
5 min read, Read