Gas Safety Certificate Merton — from £64.99

What is a Gas Safety Certificate (CP12)?

A Gas Safety Certificate, formally known as a CP12, is a document confirming that all gas appliances, flues and pipework in a rental property have been inspected by a Gas Safe Registered engineer and found to be safe. The engineer checks each appliance for correct operation, adequate ventilation, secure flue connections and correct gas pressure, and lists every appliance on the certificate along with its result.

Every private landlord in England has been legally required to hold a valid CP12 and renew it every 12 months since the Gas Safety (Installation and Use) Regulations 1998 came into force. This national duty applies in Merton as it does across England, and an HMO licence can add its own conditions on top.

Gas safety in Merton — local property context

Most Merton homes predate 1939, and the inter-war years, not the Victorian era, are the largest single build period. Only 26.5% of council tax properties were built before 1919, below London's 29.1%, and about 88% predate 2000 (VOA 2025). Flats in converted or shared houses hold 9.2% of households, against 11.1% London-wide (Census 2021).

At the 2021 Census, 29.1% of Merton households rented privately, close to London's 30.0%. Owner-occupation was 55.6% (London 45.2%) and social renting 14.2% (London 23.1%). Our Gas Safe registered engineers are experienced with the boilers, gas fires and appliances typically found in properties across the SW19, CR4, SM4, SW20, SW16, KT3, SW17 postcode areas, and regularly carry out CP12 inspections across Merton for private landlords, letting agents and HMO operators.

Gas safety in Merton HMOs: one cooker for every five sharers

Merton's HMO amenity standards count cookers by occupants: one full set, with oven, grill and four rings, for every five people. A shared kitchen may serve no more than five people. It must be no more than one floor from the rooms it serves, unless there is a dining area or lounge on the kitchen's own floor.

A sixth sharer can therefore mean a second cooker set, in a larger kitchen or a second one. If it runs on gas, have the Gas Safe engineer who fits it record the work, and make sure it is on the gas safety record.

The standards also say the cooker must not compromise the means of escape. If a gas cooker sits on or beside the escape route, raise it before the engineer's visit, because moving it is gas work as well as a layout change.

Homes built 1919 to 1939

36.8% (London 22.2%)

VOA 2025

Households in terraced houses

35.7% (London 21.3%)

Census 2021

Households in purpose-built flats

28.4% (London 40.3%)

Census 2021

Gas Safety Certificate pricing in Merton

Fixed pricing by number of gas appliances. The same prices apply in Merton as across all other London boroughs — no London surcharge. The only location-based fee is the £20 Congestion Charge Zone addition for central London properties.

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What's included from £64.99

Every gas safety check we carry out in Merton covers the complete inspection at no extra cost beyond the price shown.

• Inspection of every gas appliance — boiler, hob, cooker and gas fire
• Flue flow and spillage testing on every appliance with a flue
• Gas pressure and burner pressure checks
• Visual check of pipework, joints and fittings for leaks or damage
• Ventilation adequacy check for every gas appliance
• Gas Safe registered engineer — fully qualified and independently assessed
• Signed CP12 certificate emailed within 24 hours
• Immediate isolation of any appliance found to be unsafe

Other landlord certificates in Merton

We also cover these landlord certificates in Merton:

Managing an HMO in Merton? See all HMO compliance certificates →

Gas Safety Certificate in nearby boroughs

We cover all 33 London boroughs. See Gas Safety Certificate pricing and booking for areas near Merton: