Professional heating and plumbing services led by Edward Hollis
Hollis Plumbing and Gas Ltd is a family-run plumbing and heating business based in Cardiff and serving the Vale of Glamorgan, Bridgend and the surrounding South Wales area. Edward Hollis founded the company in 2015 and brings over 22 years of hands-on plumbing, heating and gas engineering experience to every job.
We are Gas Safe registered, which is a legal requirement for anyone working on gas appliances in the UK. That covers the boiler servicing, landlord gas safety checks and installation work we carry out. We keep our qualifications current and only send Gas Safe engineers to any job that involves gas.
We are proud of the work we do and the reputation we have built locally. Most new customers come to us through recommendations from homeowners and landlords we have already worked with. That trust is worth more than any advertising campaign, and it is why we treat every job as though the next customer is watching.
If you need a boiler serviced, a landlord gas safety certificate, or advice on a heating or plumbing job in Cardiff or South Wales, call 02921 258852 or send an enquiry through the form. We will get back to you, quote clearly, and arrive when we said we would.
Cottrell Resortt
Highly Recommended! Thank you to Hollis for all the hard work they do at Cottrell Resort. They are always there when we need them, providing a reliable, professional, and trustworthy service. We highly recommend them and look forward to continuing to work together.
Thabza T Kay
Professional, courteous and on top of it , We feel lucky to have found such a great account manager. Made $18,500 at in just few days of investing with the minimum of $1500, Thank you ma'am Alicia Malone! Contact her now . Email: aliciamalone770@gmail.com WhatsApp: +1218 394-2379
Charlotte Bowling
Highly recommended! We recently had a boiler fitted by Hollis. The team were fantastic, including the lady we dealt with over the phone. Ed and the team went above and beyond during a very difficult time for us. The house was cleaned after, you wouldn’t have know they had been inside. PPE worn by all staff also. They even checked it our cat was a house cat in case they let him out by mistake. Little things that added to an already professional service. An overall fantastic job. Thank-you!
Ang Beer
I can’t thank Ed enough for everything he has helped us with. We have had one problem after another with our plumbing but Ed has always helped us out and the problem has always been resolved straight away. Can always count on Ed. Would highly recommend!
David O'Connor
The team at Hollis & Sons completed all of the plumbing improvements associated with our house extension earlier this year i.e. kitchen, downstairs bathroom, and utility room. This included decommissioning of the old boiler, plumbing in the new boiler, placing additional radiators into the new system and all pipe and waste works for the bathroom, kitchen and surrounds. Ed & Jase were always on time, clean, professional and worked effectively for us diligently in alignment with COVID 19 guidelines, consulting us on all decision making as the project progressed and certifying all works to standards. Thanks gents, we’ll use you for all our future maintenance work!
Laura Jayne
Very professional, tidy, polite and quick. They are very reasonably priced and honest about what needs doing. We have had work done on two separate occasions and have been really pleased with the outcome. Thanks!
Leanne Mooney
Fantastic service, fitted me in last minute with an emergency with my boiler. would definitely recommend. Thank you Ed.
Wendy Slater
Fitted us in at the last minute for an emergency job when we had issues with a toilet flush. Came on a Saturday - very good price for an awkward job (was more than just the flush). Clean, tidy, reliable and polite. Would definitely recommend.
Claire Louise Doyle
We just had our new bathroom fitted by Ed and his boys they did such an amazing job such polite men we are in love with our new bathroom We have had Ed also service our boiler in our old house which again Ed was very efficient
Yvonne Lorraine
These boys are the best of the best. my Aunt had a leak under the floor boards on the landing. They came within half hour of the call out. repaired the leak in an old lead pipe. A marvellous job. Having requested them to look into replacing some lead pipes in my aged Aunts house, they arrived spent 2 hours examining the pipework, they said that it didn't need to be done. They put everything back the way it was cleared up any mess, and left with no charge. Most companies would not have been so honest. definitely a 5 star company. Thank you all.
Richard Cross
Very speedy work. great service
Rhonda Collins
Highly recommend Ed and the team, very reliable and friendly service!
Dan Woodfin
Bought our first home and had the Hollis team in to install a whole new central heating system and boiler. Did an amazing job and more than willing to help with all other queries regarding the house. dealt with around 3 or 4 of the employees and all polite and happy to help. keep up the good work Ed and the boys
Rhys Miller
Highly recommend team Hollis. Had work done by Hollis Plumbing, great to have Ed's knowledge on influencing the project. As for the work being done by Jason I can not praise enough, kept my place clean and received a professional & efficient install. Thank you so much!
Beth Hill
Had a new bathroom fixed last month! Ed & the boys did a fab job, very pleased ��
Telg Tam
Ed and the team is brilliant. They are reliable and always do a good job.
Scott Bees
Absolutely fantastic service. Ed is a total pro. Was having trouble getting a boiler fitted. No one would do it for 2 weeks. Called ed on the Wednesday, who came out that same night to look at the job and did the work on the Saturday. Would highly recommend and will definately use again. Thanks guys.
We cover Cardiff, the Vale of Glamorgan, Cowbridge, Penarth, Dinas Powys, St Athan, Llantwit Major and Bridgend. If you are close to that area and not sure whether we come to you, give us a ring on 02921 258852 and we will confirm.
Yes. Every engineer working on gas is Gas Safe registered and carries a Gas Safe ID card that you can ask to see at any time. Any work we do on gas appliances, from a service to a landlord safety check, is signed off under our Gas Safe registration.
Hollis Plumbing and Gas Ltd has been trading since 2015 (Companies House 09874398), and owner Edward Hollis has over 22 years of hands-on plumbing, heating and gas engineering experience across Cardiff and South Wales.
Our standard hours are Monday to Friday 08:00 to 17:00, with Saturday mornings available for appointments. We do not run a standard Sunday service but we are available for genuine emergency call-outs 24 hours a day.
No. We provide free, no-obligation quotes for all our work. Call us on 02921 258852 or send an enquiry through the form and we will come back to you with a clear price.
We accept card payments, bank transfers and cash. Payment is normally taken on completion of the work for services and small jobs. On larger installations we agree the payment schedule with you before the job starts.
The boiler is cleaned and checked to make sure it is in good, safe working order. We inspect the burner, controls, seals and safety devices, run the boiler up under load and confirm everything is operating within the manufacturer's tolerances. If we spot anything that needs attention we let you know before we leave.
No, repairs are not covered by the £90 service price. If we find something during the service that needs repair we will explain what is required and give you a separate quote before doing any additional work.
A standard boiler service is a fixed £90. That includes the full clean, safety inspection and any documentation you need afterwards.
Once a year is the sensible interval, and it is what most manufacturers require to keep the boiler warranty valid. Booking in through autumn ahead of winter is a good rhythm.
We service all major brands including Worcester Bosch, Vaillant, Baxi, Alpha, Ideal and Glowworm. If you are not sure what brand you have, tell us the model number when you book and we will confirm.
Yes. The £75 landlord gas safety check covers the gas fire, gas hob and boiler in the same property, all done in one visit for one set price. If your property has a different combination of appliances, tell us when you book and we will confirm the price before we arrive.
Yes. Every rental property in the UK with a gas appliance must have a valid Landlord Gas Safety Certificate (CP12), renewed every 12 months, issued by a Gas Safe registered engineer. As a landlord you are legally responsible for arranging it.
We issue the CP12 on the day of the inspection. It is emailed straight to you (or your lettings agent) once the check is signed off, so you have the paperwork on record straight away.
Yes. We work with several lettings agents across Cardiff and the Vale of Glamorgan. We can liaise directly with the tenant to book access and send the certificate straight to the agent, which keeps the paperwork clean.
If we find a fault that makes an appliance unsafe we will explain what is wrong, isolate the appliance if needed, and quote separately for the repair. You always have a choice of whether to go ahead with the repair or arrange it elsewhere.
We quote every boiler install with a free survey rather than a rate card, because the right price depends on the boiler size, brand, warranty length and any system upgrades. Typical domestic swaps in South Wales are in the £2,000 to £3,500 range supplied and fitted. Call 02921 258852 to book a survey and we will give you a fixed price.
We install premium brands including Vaillant, Worcester Bosch, Baxi and Alpha. The right pick depends on the property size, warranty length and how you use hot water. We explain the trade-offs during the free survey and recommend the option that actually suits you.
A straightforward like-for-like swap is normally one to two days on site. Full system changes, converting from a conventional to a combi, or fitting a system boiler with a new cylinder can take longer. We give you a clear timeline as part of the quote.
Yes. Safe disposal of the old boiler is included in every install. You do not need to arrange anything separately, and we leave the property tidy at the end of the job.
Yes. All new boilers we install come with manufacturer-backed warranties, typically five to ten years depending on brand and model. We register the warranty in your name so the cover is active from day one.
Air source heat pumps work well in the UK climate as long as the property is properly insulated and the pump is sized correctly for the house. In an insulated home they can significantly reduce running costs versus gas. If the property is poorly insulated we will tell you honestly rather than push the install.
Yes. The Boiler Upgrade Scheme (BUS) offers a grant towards the cost of an air source heat pump for eligible domestic properties in England and Wales. We discuss eligibility and paperwork during the free survey and help you understand what applies.
Sometimes. Heat pumps run at lower flow temperatures than gas boilers, so larger radiators or underfloor heating help the system deliver enough heat to each room. The heat-loss survey tells us which radiators, if any, need upgrading.
Modern units are quiet, typically in the 40-50 dB range at the outdoor unit. Siting them properly (away from bedroom windows and neighbouring boundaries) keeps them unobtrusive. We look at siting as part of the survey.
Yes. We service and repair air source heat pumps on an ongoing basis, not just install them. Annual servicing keeps the pump running efficiently and protects the manufacturer warranty.
Wet (water-based) systems are usually the better choice for whole-room or whole-house coverage and are cheaper to run over time. Electric systems are quicker to retrofit and make sense for single rooms, especially bathrooms. We recommend which fits your project during the survey.
Yes in most cases. Standard gas combi and system boilers can supply an underfloor heating loop with the right controls. If any changes to the boiler or hot water setup are needed we flag them during the survey and quote them up front.
A single-room electric underfloor system can often be fitted in a day or two. A whole-house wet system takes longer and needs to be coordinated with the flooring and screed work. We give you a full timeline with the quote.
In a properly insulated property, yes. Wet underfloor heating can be the primary heat source for a whole home, especially alongside a heat pump. In a poorly insulated older property, underfloor may work best as supplementary heating for kitchens, bathrooms and extensions.
Wet underfloor heating is usually cheaper to run than radiators once the system reaches temperature, because it operates at lower flow temperatures across a larger surface area. Electric underfloor is more expensive to run per kWh, which is why it makes more sense for small rooms.
Both. Some customers want us to run the whole project (plumbing, tiling, building work and finishing). Others want us to handle the gas and plumbing work alongside their own builder and tiler. Either way we coordinate cleanly so the sequence is right.
A straightforward like-for-like refit is normally one to two weeks. Wetrooms, moved plumbing runs, or bigger renovations take longer. We give you a realistic timeline as part of the fixed-price quote.
Yes. We can supply the bathroom suite, tiles and fittings through our trade suppliers, or you can supply your own and we fit them. If you supply your own we still quote a fixed price for the fit and coordinate the delivery timing.
Not always. If the existing boiler comfortably runs the new bathroom (and any other outlets you use at the same time) it stays. If it does not, we flag it up front, price the upgrade into the quote, and give you the choice rather than surprise you mid-project.
Yes. Wetrooms need the drainage, tanking (waterproofing) and tiling done properly to avoid leaks, so we take extra care with the tanking layer and the tile falls. We can either run the whole wetroom project or work alongside your builder.