17 Best Gas Engineers in London for 2026

🔥 17 businesses · 📍 London
✓ Verified Google reviews · ✓ Reviewed regularly · ✓ Updated 29 May 2026
Mark Reid
Written by Mark Reid, Trades Editor · Verified 29 May 2026
London's housing stock throws up challenges that gas engineers deal with every single day. Victorian terraces in Islington and Hackney often have original cast-iron pipework that's been patched and extended over decades, while the inter-war semis sprawling across Bromley, Ealing, and Croydon frequently have oversized boilers installed during the 1980s that are well past their efficient working life. Newer build flats in Canary Wharf and Stratford tend to run combi boilers in tight utility cupboards, with very little room for manoeuvre during a repair or replacement. Gas engineers here also work within some of the most densely occupied buildings in the country, which means jobs like flue routing, stopcock access, and meter relocations can involve negotiating with building managers or checking party-wall agreements before a single tool comes out. Add to that the sheer variation in postcodes, from E1 to SW19, and you start to understand why a good London gas engineer needs broad practical experience rather than a narrow speciality.

The businesses on this page were drawn from third-party public business listings and ranked by review rating and review count, with a small upward adjustment for those that show a working website and a phone number. Before a business makes it onto the page at all, we check its homepage to confirm that gas engineering work is what it primarily offers. That step keeps unrelated trades off the list. Any listing flagged as permanently closed is removed automatically. A small number of businesses carry a Trust Verified badge. That badge means the business has additionally passed our full verification process, covering trade qualifications and accreditations, public liability insurance, trading history, customer review history, and registered company information. You can see the full list of what that verification covers on our How We Verify page. For any business on this page that does not carry that badge, those independent checks have not been carried out by us, and you should do them yourself before booking.

Before you confirm any gas work, ask the engineer for their Gas Safe registration number and check it directly on the Gas Safe Register website. It takes about thirty seconds and confirms they're legally authorised to work on the specific type of appliance in your home. Always ask for a written quote, not just a verbal estimate, and get at least two or three for larger jobs like a boiler replacement, where prices in London typically range from around £1,500 to over £3,000 depending on the boiler make, flue type, and any additional pipework involved. Once the work is complete, make sure you receive a Gas Safety certificate for any appliance installation or landlord safety check, and ask for the boiler manufacturer's commissioning paperwork so your warranty stays valid. Keep all paperwork together in a safe place. Your insurer may ask for it.
How We Select & Rate The Best Gas Engineers in London

Rankings on this page are driven by public review rating and review count, sourced from third-party business listings, with a small lift applied to businesses that have a working website and phone number. Before inclusion, we check each business's homepage to confirm gas engineering is what it primarily offers, which keeps unrelated trades off the page. Permanently-closed listings are removed automatically. Businesses marked Trust Verified have additionally passed our full verification, covering trade qualifications and accreditations, public liability insurance, trading history, customer review history, and registered company information. See our How We Verify page for the full list. Other businesses on this page have not been independently verified by us, and inclusion is not an endorsement. Always do your own checks before hiring.

Positions 1–5 (Recommended and Featured) may be paid placements. Every other listing is ranked on rating and review count from third-party business listings. How we rank & verify →

Quick Comparison — Gas Engineers in London

# Business Rating Reviews Phone
1 MJV Gas and Heating Ltd Recommended ⭐ 5.0 53 +44 7434 048579 View →
2 J R Heating & Plumbing Featured ⭐ 4.9 47 +44 7800 820668 View →
3 Bellmore Plumbing & Heating - Plumbers Coulsdon Featured ⭐ 5.0 37 +44 7498 499221 View →
4 AC Heating Featured ⭐ 5.0 28 +44 7481 511110 View →
5 CS Gas & Mechanical Services Ltd Featured ⭐ 4.9 31 +44 7809 150035 View →
6 Will Heat Services Ltd ⭐ 5.0 24 +44 7874 056909 View →
7 DNB Heating ⭐ 5.0 14 +44 7375 332119 View →
8 Heat Spark Services ⭐ 5.0 13 +44 7367 992225 View →
9 GAS FLOW 4U ⭐ 5.0 11 +44 20 3740 1285 View →
10 South East Gas Ltd ⭐ 5.0 8 +44 1708 480191 View →
11 Izgas ⭐ 5.0 6 +44 7455 254535 View →
12 Heating and Cooling Specialists ⭐ 5.0 5 +44 20 3996 2640 View →
13 Rok heating ⭐ 5.0 5 +44 7754 207450 View →
14 Trusted City Plumbing ⭐ 5.0 4 +44 20 3633 6681 View →
15 Jeeves Plumbing & Heating Ltd ⭐ 5.0 3 +44 7858 745810 View →
16 Heritage Gas Services Ltd ⭐ 4.2 5 +44 800 285 1789 View →
17 District Services ⭐ 4.2 5 +44 800 689 0701 View →

Our Top Picks

6
Will Heat Services Ltd
Not Verified
5.0 (24 reviews)

Will Heat Services Ltd provides gas boiler engineering services across London from their South Croydon base. The company has earned a 5-star rating from 24 verified customer reviews, reflecting their reputation for reliable heating system work. They serve customers throughout the capital area, offering professional boiler installation, repair, and maintenance services.

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7
DNB Heating
Not Verified
5.0 (14 reviews)

DNB Heating provides gas boiler engineering services across London, specialising in boiler installations, repairs, and maintenance for residential and commercial properties. The company has earned a perfect 5-star rating from 14 verified customer reviews on Google, reflecting their reliable service and technical expertise. Their qualified engineers handle all aspects of boiler work, ensuring homes and businesses maintain efficient heating systems throughout the year.

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8
Heat Spark Services
Not Verified
5.0 (13 reviews)

Heat Spark Services provides gas boiler engineering services across London, operating from their Barking base in the IG11 area. The company has earned a perfect 5-star rating from 13 verified customer reviews on Google. Their engineers handle boiler repairs, maintenance, and installations for residential and commercial properties throughout the capital.

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9
GAS FLOW 4U
Not Verified
5.0 (11 reviews)

GAS FLOW 4U provides gas boiler engineering services across London, specialising in boiler installations, repairs, and maintenance for residential and commercial properties. The company has earned a perfect 5-star rating from 11 verified customer reviews on Google. Their qualified engineers handle everything from emergency boiler breakdowns to routine servicing and new system installations throughout the London area.

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10
South East Gas Ltd
Not Verified
5.0 (8 reviews)

South East Gas Ltd provides gas boiler engineering services across London, specialising in boiler installations, repairs, and maintenance. The company has earned a perfect 5-star rating from 8 verified customer reviews on Google. Their qualified engineers offer reliable heating solutions for residential and commercial properties throughout the capital.

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11
Izgas
Not Verified
5.0 (6 reviews)

Izgas provides gas boiler engineering services throughout London, operating from their Sutton base in the SM2 area. The company has earned a perfect 5-star rating from 6 verified customer reviews on Google. Their services cover boiler repairs, maintenance, and installations for residential and commercial properties across the capital.

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12
Heating and Cooling Specialists
Not Verified
5.0 (5 reviews)

Heating and Cooling Specialists provides gas boiler engineering services across London, focusing on installation, maintenance, and repair work for residential and commercial properties. The company has earned a perfect 5-star rating from 5 verified customer reviews on Google. Their qualified engineers handle boiler servicing, emergency repairs, and system upgrades throughout the London area.

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13
Rok heating
Not Verified
5.0 (5 reviews)

Rok Heating provides gas boiler engineering services across South Croydon and the surrounding CR2 area. The company has earned a 5-star rating from 5 verified customer reviews for their boiler installation, repair and maintenance work. Based in Selsdon, they serve residential and commercial clients throughout the local region.

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14
Trusted City Plumbing
Not Verified
5.0 (4 reviews)

Trusted City Plumbing provides gas boiler engineering services across London from their Barking base. The company maintains a perfect 5-star rating based on 4 verified customer reviews. They serve the IG11 postcode area and surrounding London neighbourhoods with professional boiler installation, maintenance and repair services.

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15
Jeeves Plumbing & Heating Ltd
Not Verified
5.0 (3 reviews)

Jeeves Plumbing & Heating Ltd provides gas boiler engineering services across London, specialising in boiler repairs, maintenance, and installations. The company has earned a perfect 5-star rating from 3 verified customer reviews, reflecting their reliable service delivery. Their qualified engineers handle both residential and commercial gas boiler systems throughout the Greater London area.

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16
Heritage Gas Services Ltd
Not Verified
4.2 (5 reviews)

Heritage Gas Services Ltd provides gas boiler engineering services across London from their base in SE9. The company maintains a 4.2 out of 5 star rating based on 5 verified customer reviews. Their team handles boiler installations, repairs, and maintenance for residential and commercial properties throughout the capital.

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17
District Services
Not Verified
4.2 (5 reviews)

District Services provides gas boiler engineering services across London and the surrounding areas from their base in Sidcup. The company has earned a 4.2 out of 5 star rating from 5 verified customer reviews on Google. They offer professional boiler repair, maintenance and installation services for residential and commercial properties.

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Transparency notice: Recommended (#1) and Featured (positions 2-5) listings may be paid placements, so a business's fee affects whether and where it appears in those positions. All other listings are ranked by a combined score drawn from ratings and review counts published on third-party business listings, plus basic completeness signals such as a working website and phone. A Trust Verified badge means we have independently checked that business's documents; businesses without it have not been independently verified by us. How we verify →

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Frequently Asked Questions

How much does a gas engineers cost in London?
Basic boiler servicing typically costs £80-120, whilst repairs range from £150-400 depending on parts needed. New boiler installations start around £2,500 for a basic combi boiler, rising to £4,500+ for premium models with complex pipework changes. Emergency callouts often carry a £100-150 attendance fee before any work begins. Prices vary significantly between inner and outer London, so getting two or three quotes helps you understand local rates.
How quickly can a gas engineer attend an emergency in London?
Most established engineers aim for same-day attendance for genuine emergencies like gas leaks or complete heating failures in winter. However, during cold snaps, you might wait 24-48 hours as demand peaks. Some specialists offer guaranteed response times but charge premium rates. For non-urgent repairs, expect to wait 3-7 days for an appointment, though this stretches during busy periods.
Do I need a Gas Safe registered engineer for all boiler work?
Yes, legally only Gas Safe registered engineers can work on gas appliances, pipework, and flues. This includes installations, repairs, servicing, and safety checks. Always ask to see their Gas Safe ID card and verify the registration number online before work starts. Using unregistered engineers invalidates insurance and creates serious safety risks. The only exception is basic maintenance like topping up pressure, which homeowners can do themselves.
What's included in a standard boiler service?
A proper service includes checking gas pressures, testing safety devices, inspecting the heat exchanger, verifying flue operation, and testing carbon monoxide levels. Engineers also examine pipework joints, clean key components, and check the boiler's efficiency. You'll receive a service record and advice on any issues found. The whole process takes 45-90 minutes depending on your boiler type and age.
Can boiler engineers work on all heating system types in London homes?
Most Gas Safe engineers handle standard combi, system, and regular boilers, but some specialise in particular brands or older systems. Victorian and Edwardian properties sometimes have unusual configurations requiring specific expertise. Always mention your boiler make, model, and approximate age when booking. For oil boilers or LPG systems, you'll need engineers with additional qualifications beyond standard gas registration.
How do I verify a gas engineer's credentials and reputation?
Check their Gas Safe registration number on the official Gas Safe Register website, ensuring it covers the work you need done. Read recent Google reviews focusing on similar jobs to yours, and ask for references from recent customers. Verify they have proper insurance and belong to trade associations. Get written quotes that specify parts, labour, and guarantees offered. Avoid anyone who cold-calls or pressures you to decide immediately.