Landlord gas safety certificate (CP12)
Annual CP12 checks for flats, houses and HMOs, with the record ready to send to tenants and letting agents.
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For gas work in Islington, from Barnsbury and Canonbury to Highbury, Holloway and Archway, use a Gas Safe registered engineer qualified for your appliance. Most Islington gas jobs are landlord gas safety records and boiler work in terraces split into flats. Water here is hard, averaging 264 to 272 mg/l in Thames Water's local zones.
Islington, LondonThe homes
Islington is a borough of Georgian and Victorian terraces, many of them divided into two, three or four flats, alongside large council estates and newer blocks around King's Cross and Archway. The council lists 42 conservation areas, so flue positions, external pipework and meter boxes on front elevations get attention. In a converted terrace, each flat usually has its own combi boiler, often in a kitchen cupboard, with meters grouped under the stairs, in a front vault or in the basement. At the 2021 Census, 31.2% of Islington households rented privately and 40.2% rented from social landlords, so landlord checks are a large share of the work.
A typical Islington let is a flat in a converted terrace on a street off Upper Street, Holloway Road or Blackstock Road. The landlord gas safety record has to list every appliance and flue the landlord provides, usually a combi boiler and a hob, and the tenant must get a copy within 28 days (HSE). Where one boiler in a basement heats several flats, that communal boiler must be maintained and included in the yearly check too.
Access is the thing that holds up Islington checks most. Controlled parking covers most streets and many buildings have shared front doors. Tell us how the engineer gets in and where to park when you book, and the check can be done in one visit.
Islington sits across several Thames Water supply zones. The 2025 reports show average hardness of 272 mg/l in Highbury, 271 mg/l in Holloway, 268 mg/l in Pentonville and 264 mg/l in Shacklewell and Canonbury (Thames Water, Highbury zone). All of that is hard on Thames Water's scale. Combi boilers in Islington flats scale up in the plate heat exchanger, which shows as hot water that runs warm, then hot, then warm. A service each year and a scale reducer on the cold feed help.
In a conservation area, a new flue through a front wall, or a new meter box on a front elevation, may need more thought than on a rear wall. Most replacement boilers in Islington terraces flue out to the back or up through the roof. If your flue runs through a ceiling void to reach an outside wall, the engineer needs inspection hatches to see it, as HSE has required since the end of 2012. When moving a meter for a basement or kitchen refit, Cadent handles the meter move as a service alteration, and a Gas Safe engineer reconnects the pipework afterwards.
Kitchen refits in Islington flats often mean swapping a free standing cooker for a built in hob and oven, or switching from gas to induction. A gas hob or cooker must be connected or disconnected by a Gas Safe engineer with the Cooker category, and Gas Safe Register says brand new gas cookers installed in flats need a flame supervision device. If you switch to induction, the gas pipe to the old hob needs capping safely, and the new circuit is a job for an electrician. Keep a note of where the capped pipe sits for whoever works on the kitchen next.
Most asked for in Islington
Annual CP12 checks for flats, houses and HMOs, with the record ready to send to tenants and letting agents.
BookNo heating, no hot water, fault codes, low pressure or kettling. We find the fault and price the repair before starting.
BookYearly clean and safety test for combi, system and regular boilers, with a written service record.
BookNew gas runs for kitchens, extensions and boilers, and reconnection after the network moves your meter.
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Reading for Islington homes
Yes. Thames Water's 2025 reports give averages of 264 to 272 mg/l across the Highbury, Holloway, Pentonville and Shacklewell and Canonbury zones, which is hard on its scale.
The National Gas Emergency Service on 0800 111 999. Cadent runs the north London gas network and its engineer makes the situation safe before any repair.
Meters should be labelled with the flat they serve. If they are not, ask your landlord or managing agent, and get it labelled at your next gas check.
Send the details and get a reply to arrange a visit.