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What is a Landlord Gas Safety Certificate (CP12)?

A Landlord Gas Safety Certificate – commonly known as a CP12 — is a legal document confirming that all gas appliances, flues and pipework in your rental property have been inspected and are safe for tenants to use.

Under the Gas Safety (Installation and Use) Regulations 1998, every landlord in England and Wales with a gas supply in their rental property must hold a valid CP12 at all times. The certificate must be renewed every 12 months without exception, and a copy must be provided to tenants within 28 days of each inspection.

Failure to hold a valid certificate can result in fines of up to £6,000 per breach, invalid landlord insurance, and in the event of a gas-related incident, potential criminal prosecution.

Landlord Gas Safety Certificate Prices — London

All prices include the full gas safety inspection, a digital CP12 certificate issued on completion, and a copy you can share directly with your tenants or letting agent. No hidden call-out charges. No admin fees.

Service Price 
1 appliance (boiler only) From £90 +VAT 
2 appliances (boiler + hob or gas fire)From £110 +VAT 
HMO / 3 or more appliances POA – call for quote 
Portfolio landlords (3+ properties) Discounted rate 
available 

What Does a CP12 Gas Safety Inspection Cover?

Our Gas Safe registered engineers carry out a comprehensive inspection of all gas appliances and associated infrastructure in your property. Every inspection covers:

Boiler safety check

combustion analysis, flue integrity, heat exchanger inspection, and pressure testing

Gas pipework and meter

tightness testing across all accessible pipework and meter connections

Gas hobs and cookers

burner operation, flame failure device testing, and ventilation check

Gas fires and room heaters

flue draw, combustion safety, and correct operation

Carbon monoxide risk assessment

ventilation adequacy and CO risk across all appliances

Safety device operation

confirming all safety shut-off devices are functioning correctly

On completion, your digital CP12 certificate is issued immediately no waiting, no chasing. The certificate includes full appliance details, test results, and engineer credentials, and is accepted by letting agents, insurers, and local authorities across London.

Why London Landlords and Letting Agents Choose VHL

100% gas safety compliance rate across all social housing contracts

VHL Mechanical has been delivering gas safety services across London since 1992. We are Gas Safe registered, ISO 9001 certified, and trusted by Hillingdon Council, housing associations, and commercial property managers to maintain 100% compliance across their portfolios.

Unlike sole traders and small operators, we provide:

  • Instant digital certificates – your CP12 is issued the moment the inspection passes, with a digital copy sent directly to your email. Share it with tenants or your letting agent immediately no delays, no paperwork.
  • Engineer accountability – all VHL engineers are DBS-checked, uniformed, and carry full Gas Safe ID. You receive a tracking link when your engineer is on the way, and a full job report on completion.
  • Same-day appointments available – for landlords with urgent compliance requirements, we offer fast-turnaround booking across all London boroughs. Call before midday for same-day availability.
  • Portfolio management – we work with letting agents and multi-property landlords to schedule and manage annual CP12 programmes, with consolidated reporting across your full property portfolio.
  • Multi-trade capability – if an appliance fails inspection, our engineers carry common spare parts and can complete most remedial work on the same visit, avoiding re-attendance delays and keeping your compliance on track.

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    Awaab’s Law & Landlord Compliance What You Need to Know

    Awaab’s Law, introduced under the Social Housing (Regulation) Act 2023 and now enforced with strict timelines, places new legal obligations on landlords to respond rapidly to hazard reports from tenants — including heating and gas safety failures.

    An up-to-date CP12 is your first line of defence. If a tenant raises a heating or gas safety complaint and your certificate has lapsed, you face both a compliance breach and potential legal exposure under the new legislation.

    Read our full Awaab’s Law guide
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    CP12 Gas Safety Certificates Across London

    Our Gas Safe engineers cover all London boroughs and surrounding areas from our hubs across Greater London. We regularly carry out CP12 inspections in:


  • West London: Ealing, Hillingdon, Uxbridge, Harrow, Wembley, Brentford, Acton, Southall, Hayes, Ruislip
  • North London: Barnet, Enfield, Haringey, Islington, Camden, Hampstead, Finchley, Edgware, Tottenham
  • Central London: Westminster, Kensington, Chelsea, Mayfair, Paddington, Marylebone, Pimlico, Waterloo, Lambeth
  • East London: Ilford, Stratford, Hackney, Tower Hamlets, Romford, Barking – Walthamstow
  • South London: Croydon, Bromley, Lewisham, Greenwich, Wandsworth, Merton

    Same-day and next-day appointments available across all areas.

    • Call 0208 102 9898

    FAQ

    Frequently Asked Questions – Landlord Gas Safety Certificates

    How often does a landlord need a gas safety certificate?

    Every 12 months without exception. The certificate cannot lapse once it expires, the property is technically non-compliant and the landlord faces legal risk. We recommend booking your renewal 2-4 weeks before the expiry date to avoid gaps in compliance.

    What happens if an appliance fails the inspection?

    Gas Safe engineers classify faults into three categories: Immediately Dangerous (ID), At Risk (AR), and Not to Current Standards (NCS). If an appliance is classed as Immediately Dangerous, the engineer is legally required to disconnect it on the spot. In most cases our engineers carry common spare parts and can carry out remedial repairs on the same visit. Where parts need to be ordered, we will advise on timeline and re-attendance.

    Do I need a CP12 for a new boiler?

    Yes. Even brand-new boilers in rented properties must be included in an annual gas safety certificate. The age of the appliance does not affect the legal requirement.

    Does a gas safety certificate cover the boiler service?

    No – these are two separate checks. A CP12 is a legal safety inspection confirming appliances are safe to use. A boiler service is a maintenance visit that cleans and optimises performance. We recommend combining both on the same visit where possible to save time and cost. Ask about our combined CP12+ boiler service package when booking.

    How quickly will I receive my certificate?

    Your digital CP12 is issued immediately on completion of a satisfactory inspection – the same day as the visit. It is sent to your email address and can be forwarded directly to your tenants or letting agent.

    Do you cover my area?

    We cover all London boroughs and surrounding areas including Essex, Hertfordshire, Surrey, and Kent. Call 0208 102 9898 to confirm availability in your area.

    Can you manage CP12 certificates for multiple properties?

    Yes – this is a core part of what we offer. We work with letting agents and portfolio landlords to schedule, manage, and report on annual CP12 programmes across multiple properties. Contact us to discuss a portfolio agreement.

    Get in touch with us

    If you are in need of a professional plumbing, heating, electrical or boiler repair service, then get in touch with our team by phone, email or by filling out our contact form


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