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Every listing is verified at time of listing — Gas Safe registration checked against the Gas Safe Register where applicable, evidence of public liability insurance checked, business identity and named contact validated. No paid placements go live without verification — listing comes after checks, not before.

Most boiler repair visits start with a diagnostic: the first visit confirms the fault and whether parts are needed. Simple faults may be fixed in one visit; complex component failures (heat exchanger, PCB) typically need parts ordered and a return visit. Typical price ranges are listed below. No call centres, no middlemen — you contact the engineer directly, describe the fault and any fault code, and confirm diagnosis cost and availability before booking.

If the engineer’s diagnosis suggests replacement is more cost-effective than repair, our Repair or Replace guide covers the numbers to weigh.

Before any engineer begins gas work, ask to see their Gas Safe ID card and check the back of the card for the specific work categories they are qualified to carry out.

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Gas and carbon monoxide safety — when to stop and call

Boiler faults can sometimes indicate gas escape, incomplete combustion or carbon monoxide (CO) risk. Some signs require immediate action — they are not “wait until tomorrow” repair calls.

If you smell gas, suspect a gas leak, or your CO alarm sounds:

1. Leave the property with everyone in it. Don’t switch on lights, use phones, or operate any electrical switches inside the property.
2. Call the National Gas Emergency Service on 0800 111 999 (24 hours a day, 7 days a week) from outside the property.¹⁰
3. Don’t return until the gas emergency service confirms the property is safe.

If you or anyone in the household has symptoms that may indicate carbon monoxide poisoning — headaches, dizziness, nausea, breathlessness, collapse or loss of consciousness — and you suspect CO exposure, treat it as urgent:

• Get out into fresh air immediately and switch off fuel-burning appliances on the way out if you can do so safely
• Call 999 if anyone is unconscious, struggling to breathe, has collapsed, has severe symptoms, or you can’t get to A&E safely — NHS guidance is to call 999 rather than drive to A&E in suspected poisoning.¹⁴
• Go to A&E or call your GP for urgent medical advice if you have symptoms and suspect exposure but symptoms are milder — HSE guidance says seek urgent medical advice from either your GP or an A&E department¹
• Call NHS 111 only if you feel unwell or worried after the source of exposure has been removed and you don’t have clear symptoms of poisoning
• Also call the National Gas Emergency Service on 0800 111 999 if you suspect a gas appliance is the source¹⁰

CO alarms that meet BS EN 50291 should be fitted in rooms with fuel-burning appliances. The Gas Safe Register publishes CO safety guidance for households.

After any gas-related emergency, your boiler should be checked by a Gas Safe registered engineer before being used again.

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Gas Safe registration — the legal requirement for gas boiler work

Anyone employed to work on gas appliances, fittings or pipework in domestic premises must be a Gas Safe registered engineer and competent for that specific area of gas work.¹

The HSE confirms this requirement and notes that the engineer’s specific competencies are marked on the back of their Gas Safe Register ID card.¹

The legal requirement is set out in the Gas Safety (Installation and Use) Regulations 1998.²

Do not allow anyone who is not Gas Safe registered to carry out gas work on a boiler. You can verify any engineer’s current registration and work categories at gassaferegister.co.uk³ before work begins.

Common boiler faults

Pressure loss, fault codes, no hot water, no heating and failed ignition are among the most common reasons Croydon residents call a boiler repair engineer.

A Gas Safe engineer will establish whether the fault is pressure-related, a component failure or a control-system issue before recommending repair.

Older housing stock across Croydon — Victorian and Edwardian terraces in Thornton Heath, South Norwood, Norbury and Addiscombe, and inter-war semis in Purley, Coulsdon and Sanderstead — often has heating systems that have been altered or partially updated over time. A Gas Safe engineer will assess the specific system configuration — including pipework layout, system type and cold-fill loop — as part of any diagnostic visit.

Hard water and boiler repair in Croydon postcodes

Clean-water supply across Croydon is split. Croydon Council confirms Thames Water supplies clean water to the majority of the borough while SES Water (Sutton & East Surrey) provides clean water to the southern part of the borough.¹¹ Thames Water confirms hard water can lead to limescale build-up on household appliances and fittings⁴ — which can affect system performance over time. SES Water publishes postcode-level water hardness reports — southern Croydon postcodes should be checked against the SES Water postcode report.¹²

We recommend routine servicing by a Gas Safe registered engineer to help identify issues potentially linked to limescale build-up in heating system components. If your boiler is losing pressure, failing to heat water fully or showing fault codes, contact a Gas Safe registered engineer for diagnosis.

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Council tenants in Croydon — boiler repair and servicing route

If you live in a Croydon Council home with a council-owned boiler, repairs and annual gas servicing go through the council, not a private engineer.

Croydon Council confirms that as your landlord it must arrange yearly inspection by a Gas Safe registered contractor covering council-owned gas appliances, pipework, tenant-used appliances and flues; customer-owned appliances remain the tenant’s servicing responsibility, though the council records visual safety checks.⁵ Tenants must receive a copy of the Gas Safety Certificate before moving in, or within 28 days of the check being completed.⁶

To report a boiler fault or request servicing, call 020 8726 6101. The repairs contact centre is open Monday to Friday, 8am to 6pm for routine repairs; emergency repairs can be reported at any time of the day or night.¹³

Croydon Council’s repair priorities confirm that loss of heating and hot water is classified as emergency where there are no alternatives: the council aims to attend within 24 hours during the heating season (1 October to 31 March), or within 3 days between 1 April and 30 September.⁷

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Communal heating in Croydon — a different repair route

Some Croydon properties — particularly council estates and managed high-rise blocks around East Croydon and the town centre — are served by communal heating systems rather than individual boilers.

Croydon Council confirms communal systems are inspected annually and that a notice confirming the inspection is publicly displayed in each building.⁸

Communal systems are typically maintained by appointed contractors — check with the building owner, council or managing agent before arranging any work.

If you are unsure whether your system is communal or individual, check with your housing officer or managing agent before calling a private engineer.

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Private tenants in Croydon — landlord obligations for boiler repair

Under the Gas Safety (Installation and Use) Regulations 1998, landlords must arrange annual gas safety checks of appliances and flues provided for tenants by a Gas Safe registered engineer and provide tenants with a copy of the Landlord Gas Safety Record within 28 days of the check being completed, or to new tenants before moving in.² The duty under Regulation 36 covers appliances and flues provided by the landlord for the tenant’s use; tenant-owned appliances are outside the duty, although the landlord retains responsibility for gas pipework.²

The HSE confirms landlords are responsible for the maintenance and repair of gas appliances, fittings and flues provided for tenants — by a Gas Safe registered engineer.¹

Croydon Council advises private tenants that for an urgent repair — such as a lack of heating or hot water, or dangerous electrics — they should contact their landlord or agent immediately and follow the call up with a letter or email.⁹

If your landlord does not respond or gives an unreasonable response, contact Croydon Council’s Private Sector Housing Team on 020 8760 5476. The council uses the Housing Health and Safety Rating System to assess the hazards and risks in your home and, if they are serious, may be able to take action to get the landlord to complete work.⁹

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See the full London Plumbing Costs Guide →

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From a pressure fault in a Thornton Heath Victorian terrace to a heat exchanger failure in a Purley 1930s semi or a boiler lockout in an East Croydon high-rise — every boiler repair engineer listed here is verified, Gas Safe registered for gas work, and covering Croydon CR postcodes.

Contact verified boiler repair engineers in Croydon ↑

← Back to all plumbing services in Croydon

Last reviewed: May 2026 by Adiel Khan — SFEDI-accredited business advisor with 20+ years experience (South East Enterprise Ltd) and operator of VerifiedPlumbers. LinkedIn ↗

This page is reviewed against guidance published by HSE ↗, Gas Safe Register ↗, National Gas Emergency Service ↗, GOV.UK legislation ↗, Thames Water ↗, SES Water ↗ and London Borough of Croydon ↗. Source links are provided within this page where relevant.

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