✓ Verified Google reviews·✓ Reviewed regularly·✓ Updated 29 May 2026
Written by Mark Reid,
Trades Editor ·Verified 29 May 2026
Cardiff's housing stock is a real mix. You've got Victorian terraces in Roath and Canton with original pipework that hasn't been touched in decades, post-war semis in Llanrumney and Ely running ageing back boilers, and newer builds in Cardiff Bay and St Mellons with modern combi systems that need a completely different approach. That variety means local gas engineers tend to build up genuine breadth of experience, whether they're replacing a tired Worcester Bosch combi on a Pontprennau new-build or tracing a gas leak back through the original copper runs in an Adamsdown terrace. It's also worth knowing that Cardiff's mild but damp climate puts real pressure on boiler systems through the winter months, so annual servicing matters more than some homeowners realise.
The businesses on this page were drawn from third-party public business listings, then ranked by review rating and review count, with a small lift applied to those that show a working website and phone number. We checked each business's homepage to confirm that gas engineering work is what they primarily do, which is how unrelated trades get kept off this page. Any listing flagged as permanently closed is removed automatically. Where you see a Trust Verified badge on a listing, that 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 find the full list of what that involves on our How We Verify page. For any business on this page that doesn't carry that badge, those checks are something you'll need to do yourself before booking.
Before you commit to anyone, ask to see their Gas Safe Register card and note the licence number. Any engineer working legally on gas appliances in the UK must be Gas Safe registered, and it takes about thirty seconds to check a name on the Gas Safe website. Get at least two or three quotes for anything beyond a straightforward service, especially for a full boiler replacement, where prices in Cardiff typically run from around £1,800 to £3,500 depending on the boiler type and complexity of the installation. Ask upfront whether the quote is fixed-price or an estimate, and confirm what happens if the engineer finds additional work once they're in. Always request a Building Regulations Benchmark certificate after a new boiler installation, and make sure the engineer notifies the work to your local authority. Skipping that step can cause real problems if you sell the property.
How We Select & Rate The Best Gas Engineers in Cardiff
Rankings on this page are driven by public review rating and review count from third-party business listings, with a small lift for businesses that have a working website and phone number. We check each business's homepage to confirm gas engineering is what they primarily offer, which keeps unrelated trades off the page. Permanently closed listings are removed automatically. Businesses marked Trust Verified have additionally passed our full verification covering qualifications, accreditations, insurance, trading history, customer review history, and registered company information. See our How We Verify page for the full list. Other businesses here 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 →
Gastight Plumbing & Heating provides gas boiler engineering services across Cardiff and surrounding areas from their Penarth base. The company has earned a perfect 5-star rating from 96 verified customer reviews on Google. They specialise in boiler installations, repairs, and maintenance for residential and commercial properties throughout the region.
Spark to Flame Boilers & Heating provides gas boiler engineering services throughout Cardiff, specialising in boiler installations, repairs, and heating system maintenance. The company has earned a perfect 5-star rating from 64 verified customer reviews on Google. Their qualified engineers serve residential and commercial properties across the Cardiff area with reliable heating solutions.
GoGas Solutions Plumbing And Heating provides gas boiler engineering services throughout Cardiff from their CF14 base. The company has earned a perfect 5-star rating from 46 verified customer reviews on Google. Their qualified engineers handle boiler installations, repairs, and maintenance for residential and commercial properties across the Cardiff area.
A.T Heating & Plumbing provides gas boiler engineering services to customers across Cardiff from their base in Birchgrove. The company has earned a 4.8-star rating from 59 verified customer reviews, demonstrating consistent service quality in boiler repairs, installations, and maintenance. Their experienced engineers serve the CF14 area and surrounding Cardiff neighbourhoods.
KB Heating & Plumbing provides gas boiler engineering services throughout Cardiff from their base in CF14. The company holds a perfect 5-star rating from 32 verified customer reviews on Google. Their engineers handle boiler installations, repairs, and maintenance for residential and commercial properties across the Cardiff area.
ADM Gas Plumbing and Heating provides professional gas boiler engineering services throughout Cardiff. The company holds an impressive 5/5 star rating based on 24 verified customer reviews, reflecting their reliable approach to boiler repairs, servicing and installations. Their qualified engineers serve residential and commercial properties across the Cardiff area.
Josh Munro Plumbing, Heating & Gas services provides comprehensive gas boiler engineering solutions throughout Cardiff from their CF14 base. The company handles boiler installations, repairs, and maintenance services for residential and commercial properties. With a perfect 5-star rating from 23 verified customer reviews, they have established a strong reputation for reliable gas heating services across the Cardiff area.
GSG Plumbing and Heating provides gas boiler engineering services to customers across Cardiff from their base in Pen-y-lan. The company has earned a strong reputation with a 4.7-star rating from 32 verified customer reviews on Google. Their qualified engineers handle boiler installations, repairs, and maintenance work throughout the Cardiff area.
Flamesmart provides gas boiler engineering services throughout Cardiff, specialising in boiler installations, repairs, and maintenance for residential and commercial properties. The company has earned a perfect 5-star rating from 10 verified customer reviews on Google, reflecting their reliable service and technical expertise. Their qualified engineers handle all aspects of gas boiler work, ensuring safe and efficient heating solutions for Cardiff area clients.
Gasgasservices provides gas boiler engineering services to Cardiff and surrounding areas from their base in Penarth. The company has earned a perfect 5-star rating from 8 verified customer reviews on Google. They operate from CF64 and serve the local community with professional gas boiler maintenance and repair services.
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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Gas boiler repairs typically cost £150-400 depending on the issue and parts needed. New boiler installations range from £2,000-4,500, with combination boilers usually cheaper than system boilers. Emergency callouts cost £80-150, often applied against repair costs. Annual boiler services run £80-120. Prices vary based on boiler type, property access, and whether additional pipework is needed. Always get two or three written quotes to compare.
How quickly can a gas engineer come out in Cardiff?
For emergencies like gas leaks or complete heating failure, most Cardiff engineers offer same-day callouts, though you'll pay premium rates of £100-150. Routine repairs usually get scheduled within 2-3 days. New boiler installations typically require 1-2 weeks' notice for planning and parts ordering. Book annual services well in advance during autumn when demand peaks.
What boiler brands do Cardiff engineers typically work with?
Most Cardiff gas engineers work with major brands like Worcester Bosch, Vaillant, Baxi, and Ideal. They'll often recommend specific models based on your property size and hot water needs. Combination boilers suit most Cardiff terraces and semis, whilst larger family homes might need system boilers. Your engineer should explain why they're recommending particular brands and provide manufacturer warranties.
Do I need planning permission for a new boiler in Cardiff?
You don't need planning permission for most boiler replacements, but Building Regulations approval is required. Gas Safe registered engineers typically handle this paperwork as part of their service. If you're moving a boiler location or installing a flue on a front-facing wall, check with Cardiff Council. Listed buildings and conservation areas may have additional restrictions on external flue positions.
What should I do if my boiler breaks down in winter?
First, check your thermostat settings and boiler pressure gauge. Try resetting the boiler using the reset button. If there's no improvement or you smell gas, turn off the gas supply and call an emergency engineer immediately. Keep your engineer's contact details handy, and consider boiler cover plans that include emergency callouts. Never attempt DIY repairs on gas appliances.
How do I verify a gas engineer's credentials?
Check their Gas Safe ID card and verify the registration number on the official Gas Safe Register website. The card should be current and show they're qualified for the specific work you need. Ask for written quotes with their Gas Safe number included. Check recent Google reviews and ask neighbours for recommendations. Avoid door-to-door traders and always get multiple quotes for major work.
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