Is a gas safety check the same as a boiler service?

In the UK, landlords must arrange the legal gas safety check every 12 months, but a boiler service is a separate maintenance visit rather than the certificate itself. The same practical distinction matters whether the advert says “gas safety certificate”, “CP12”, “boiler safety check” or “service and certificate”.

Is a gas safety check the same as a boiler service?

A gas safety check is not the same as a boiler service: the legally required landlord job is the smaller 12-month safety check, while a boiler service is a fuller maintenance visit and no UK statute separately requires a “boiler service” by that name. In Great Britain, the Gas Safety (Installation and Use) Regulations require landlords to “ensure that each appliance and flue to which that duty extends is checked for safety within 12 months”; Northern Ireland has the same 12-month duty under its own 2004 regulations. HSE guidance says gas appliances and flues “should be serviced in accordance with the manufacturer’s instructions” and, if those are unavailable, recommends annual servicing, but that is not the same as a statutory boiler-service interval. In market terms, the boiler service is usually the larger job: one trade guide says, “A boiler service includes all the checks of a gas safety inspection and more.” A landlord gas safety certificate and boiler service can be booked together, but they are not the same product.

Does a gas safety check cover the radiators and central heating?

A landlord gas safety check covers the gas appliance and flue, including a central-heating boiler serving the property, but it does not legally cover radiators, water pipework or the whole wet central-heating system. HSE states that the duty includes “any appliances or flues serving the premises (such as central heating boilers not installed in tenants' accommodation but used to heat them),” so the boiler itself is within the gas safety regime. HSE is also explicit that “Installation pipework is not covered by the annual gas safety check.” Radiators are different again: HSE says a non-registered person may do “‘wet work’, ie install water pipes and radiators for a heating system,” while “any work on the gas boiler itself and the final connection of the water pipework to the boiler” must be done by a Gas Safe registered engineer. So if the question is “gas safety check do they check radiators?”, the legal answer is no; an engineer may notice heating faults, but radiators are not the CP12 checklist.

Is a gas tightness test a legal requirement?

A gas tightness test is legally required immediately after work on a gas fitting that might affect tightness, but it is not a separate item that the annual landlord gas safety check is required to include just because it is the annual check. Regulation 6(6) of the Gas Safety (Installation and Use) Regulations 1998 says that where work on a gas fitting “might affect the gas tightness of the gas installation” the person doing it must “immediately thereafter test the installation for gas tightness”; Northern Ireland’s 2004 regulations use the same rule. The annual landlord check is framed differently: regulation 36(9) says the safety check must include “an examination of the matters referred to in sub-paragraphs (a) to (d) of regulation 26(9),” covering flue effectiveness, combustion air, operating pressure or heat input, and safe operation. Many engineers still carry out tightness testing during CP12 visits as good practice or business practice, but the legal trigger is work that may affect tightness, not the mere fact of the annual certificate.

Is a boiler service a legal requirement for landlords?

A boiler service is not a statutory landlord requirement by that name, but landlords must keep gas fittings safe and, in England and Wales, must keep heating and hot-water installations in repair and proper working order under the Landlord and Tenant Act 1985. The gas regulations impose the 12-month safety-check duty and the wider duty that “Every landlord shall ensure that there is maintained in a safe condition” the relevant gas fittings and flues; they do not set a separate annual boiler-service duty. HSE guidance says “Gas appliances and flues should be serviced in accordance with the manufacturer's instructions” and, where those instructions are unavailable, recommends annual servicing unless a Gas Safe engineer advises otherwise. The Landlord and Tenant Act 1985 point is narrower than many landlord guides imply: section 11(1)(c), in England and Wales only, requires the landlord “to keep in repair and proper working order the installations in the dwelling-house for space heating and heating water.” That is a repair-and-working-order duty, not a servicing interval.

How much do a gas safety check and a boiler service cost together?

A combined gas safety check and boiler service commonly costs about £100–£160 in Great Britain, with separate prices around £60–£90 for a CP12 gas safety certificate and £80–£120 for a standalone boiler service; in Northern Ireland, combined visits are quoted at about £110–£170. These prices are market rates, not regulated tariffs: HSE says “Gas Safe Register has no control over engineers' charges.” One 2026 cost guide says “Landlords pay £60–£90 for a CP12 gas safety certificate, or £100–£150 for a combined service and certificate,” while another says combined service-and-CP12 packages are “£110 to £160” and usually save “£20 to £40” against booking separately. For Northern Ireland, one local 2026 guide puts a standard CP12 at “£60 to £95” and says “Combined boiler-service-plus-certificate visits run £110 to £170.” The final quote depends on appliance count, location, access, urgency and whether remedial work is needed.

Last reviewed August 2026.

Sources

• Gas Safety (Installation and Use) Regulations 1998, regulation 36: "(a) ensure that each appliance and flue to which that duty extends is checked for safety within 12 months of being installed and at intervals of not more than 12 months since it was last checked for safety (whether such check was made pursuant to these Regulations or not) Source
• Gas Safety (Installation and Use) Regulations (Northern Ireland) 2004, regulation 36: "(a)ensure that each appliance and flue to which that duty extends is checked for safety within twelve months of being installed and at intervals of not more than twelve months since it was last checked for safety (whether such check was made pursuant to these Regulations or not) Source
• Gas Safety (Installation and Use) Regulations 1998, regulation 36: "Every landlord shall ensure that there is maintained in a safe condition Source
• HSE landlord gas appliance guidance: "Gas appliances and flues should be serviced in accordance with the manufacturer's instructions. Source
• HSE landlord gas appliance guidance: "If these are not available, we recommend that they are serviced annually, unless your Gas Safe registered engineer advises you otherwise. Source
• Boiler Central: "A boiler service includes all the checks of a gas safety inspection and more. Source
• HSE landlord gas appliance guidance: "This includes any appliances or flues serving the premises (such as central heating boilers not installed in tenants' accommodation but used to heat them). Source
• HSE landlord gas appliance guidance: "Installation pipework is not covered by the annual gas safety check. Source
• HSE landlord safety-check guidance: "A non-registered person may carry out 'wet work', ie install water pipes and radiators for a heating system, but any work on the gas boiler itself and the final connection of the water pipework to the boiler, must be done by a Gas Safe registered engineer. Source
• Gas Safety (Installation and Use) Regulations 1998, regulation 6: "Where a person carries out any work in relation to a gas fitting which might affect the gas tightness of the gas installation he shall immediately thereafter test the installation for gas tightness at least as far as the nearest valves upstream and downstream in the installation. Source
• Gas Safety (Installation and Use) Regulations 1998, regulation 36: "A safety check carried out pursuant to paragraph (3) above shall include, but shall not be limited to, an examination of the matters referred to in sub-paragraphs (a) to (d) of regulation 26(9) of these Regulations. Source
• Landlord and Tenant Act 1985, section 11: "(c) to keep in repair and proper working order the installations in the dwelling-house for space heating and heating water. Source
• HSE landlord gas appliance guidance: "Gas Safe Register has no control over engineers' charges. Source
• BestBuilders cost guide: "Landlords pay £60–£90 for a CP12 gas safety certificate, or £100–£150 for a combined service and certificate. Source
• Costwise UK boiler service cost guide: "Many engineers offer a combined service and CP12 package for £110 to £160, which usually saves £20 to £40 against booking the two separately. Source
• NI Trades gas safety certificate guide: "In 2026 NI homeowners typically pay £60 to £95 for a standard CP12 gas safety certificate covering one boiler and up to two extra appliances (a hob, an oven, a fire). Source
• NI Trades gas safety certificate guide: "Combined boiler-service-plus-certificate visits run £110 to £170. Source