Gas Safety Certificate Westminster — 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 Westminster as it does across England, and an HMO licence can add its own conditions on top.

Gas safety in Westminster — local property context

Flats dominate Westminster's housing: at the 2021 Census only about one household in ten lived in a house (7.2% terraced, 1.8% semi-detached, 1.1% detached). A further 16.1% lived in flats or bedsits in converted or shared houses. The council's licensing evidence names mansion blocks among the buildings where it finds HMOs.

Private renting was Westminster's largest tenure at the 2021 Census. Council evidence puts rent at 75.4% of median earnings in 2022-23, against 46% across London. Our Gas Safe registered engineers are experienced with the boilers, gas fires and appliances typically found in properties across the SW1, W2, W9, W1, NW8, NW1, W10, WC2 postcode areas, and regularly carry out CP12 inspections across Westminster for private landlords, letting agents and HMO operators.

Gas safety in Westminster: one yearly certificate per licensed flat

Westminster's yearly gas duty sits in selective licence condition 6. For every licensed flat with a gas supply, the licence holder must produce a gas safety certificate dated within the last 12 months each year. A copy is due within 21 days of any demand, and a landlord with several licensed flats in one block owes one for each.

Shared homes meet the gas check at the licence application instead. An HMO licence application needs a gas certificate from the last 12 months wherever there is a gas supply. Time the CP12 renewal so it is still in date when you apply or renew.

Households renting privately

43.3% (London 30.0%)

Census 2021

Households in purpose-built flats or tenements

70.2% (London 40.3%)

Census 2021

Homes built before 1900

44.1% (London 20.9%)

VOA 2025

Conservation areas

56, covering over 76% of the City

Westminster City Council

Gas Safety Certificate pricing in Westminster

Fixed pricing by number of gas appliances. The same prices apply in Westminster 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 Westminster 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 Westminster

We also cover these landlord certificates in Westminster:

Managing an HMO in Westminster? 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 Westminster: