Gas Safe registered plumbers · Watford, Hertfordshire
Plumbing & Heating in Watford, Hertfordshire and North West London
New boilers, underfloor heating and central heating from a family run, Gas Safe registered team. A free quote, a clear written price and neat, careful work.
- Gas Safe Registered
- Family run, based in Watford
- Free written quotes
- 4.9 from 85 Google reviews
Our services
Boilers, underfloor heating and everything in between
Most of our work is new boilers and heating for homeowners who want the job done properly. We also service and repair everything we fit.
New Boiler Installation
Combi, system and regular boilers, sized for your home and fitted with neat, straight pipework.
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Underfloor Heating
Even, comfortable warmth with no radiators on the walls. Planned and fitted around your rooms.
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Bathroom Installation
Complete bathrooms and shower rooms, from strip out and plumbing to tiling and the final seal.
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Boiler Service
An annual service that keeps your boiler safe, efficient and ready for the winter.
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Central Heating Installation
New and upgraded heating systems, radiators and smart controls for every room.
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Landlord Gas Safety Certificate
Annual gas safety checks and certificates for rental properties, arranged around your tenants.
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What our customers say
Recommended by local homeowners
“Selvin did an amazing job sorting out multiple heating and plumbing issues in my house. He’s extremely clean, professional, and takes real pride in his work. Top-quality service!”
★★★★★Ertan HataysalHeating and plumbing“He was able to order a new boiler within a short period of time and changed it within few hours. It was a lot of work and quite challenging, but he embraced the challenge with a big smile. Once the work was completed, he left the area spotless and explained everything I need to know about the boiler..”
★★★★★Daniella AngelovaNew boiler“Just had a boiler changed and the team were excellent and didn’t waste anytime and completed the job in good time.”
★★★★★Haeima KhanamBoiler replacement“Selvin and his team were absolutely amazing. We had them install our new radiators which was not a small job! Selvin was very knowledgeable and caring, he helped us and informed us on the best options for our home.”
★★★★★David MorganNew radiators“Selvin at MJ Plumbing agreed to take a look, arrived on time, assessed the options available and gave a very fair and precise quote.”
★★★★★Michelina LumbNew shower and pump“Very pleased with the lovely new shower system for my bathtub. Finally have good water pressure and temperature. Selvin installed a pump and connected it via a new thermostatic mixer tap.”
★★★★★George WilliamsShower system“A helpful & efficient service from Selvin, who fitted in our boiler service quickly, arrived on time, and was all done in an hour.”
★★★★★Nina MoxonBoiler service“After two separate engineers failed to find the source of a gas leak in our home, I was so glad to have found MJ Services online who were able to find the leak (3rd time lucky), so we could get it fixed and have our gas put back on.”
★★★★★Janine MurphyGas leak and boiler repair, Watford“Fantastic service from Selvin and his team. Very prompt and professional- always happy to help and service our boiler and great aftercare. Top job thanks”
★★★★★Anup BansalBoiler servicing“Had radiators fitted, very nicely done, neat, and professional. We would recommend their services.”
★★★★★CA ACRadiators“Selvin was great, very professional. He managed to sort out our heating issues. 100% would use again and recommend.”
★★★★★Catherine O'NeillHeating repair“Excellent service. Solved issue with combi boiler and attended 3 times within 2 days to solve issues quickly. Excellend resposnive communication and reliable. Thanks to Silven for all your help.”
★★★★★Richard RoseCombi boiler“I would fully recommend Selvin from Mj services as he did a great job when I had a leak in the bathroom. Did it in a day as promised, cleared up the mess and left the place tidy. Reliable plumber.”
★★★★★Shirani PereraBathroom leak“On time, worked hard without a break even though it was a big job. Very personable and knowledgeable. Wouldn't hesitate to recommend him for any gas job.”
★★★★★Krys ForbesGas work“Great service. Very reasonably priced, fast and reliable work. Fitted dual range cooker. Would highly recommend.”
★★★★★LeyannaRange cooker“Selvin is a very good plumber and did an excellent job to sort a leak under our sink. He was professional and courteous and is someone we would recommend.”
★★★★★Ranjan DavidLeak repair“Very quick service. Selvin was so helpful in sorting our heating, he came when he said he would and fixed the problem. Very friendly. Thank you”
★★★★★Roberta BrownbillHeating repair“Really good service. My boiler temperature was not working. This was fixed and everything is perfect.”
★★★★★Kudzai NdlovuBoiler repair“Fitted my radiator quickly and without any fuss. Very pleasant experience.”
★★★★★Roger JacksonRadiator“Great service. Selvin installed a garden tap and the finish was very high quality”
★★★★★AlastairGarden tap“Used Selvin for the first time to change a kitchen tap. Selvin was very responsive and professional. I can't recommend his services highly enough.”
★★★★★Daniel ArmstrongKitchen tapWhy choose MJ Services
Done properly.
Explained clearly.
A boiler or a heating system is something you rely on every day for years. We fit it that way: sized for your home, neat pipework, tested properly and explained before we leave. You always know who is coming and what it will cost.
- Gas Safe registered engineers
- Free written quote before any work starts
- Family run and based in Watford
- Approved installer for Vaillant, Worcester Bosch, Baxi and Glow-worm
- Clean and respectful in your home, with floors protected
- We call back after the job to check everything is working
Our work
Recent Boiler, Heating and Bathroom Work
Every photo here is a real MJ Services job: underfloor heating, new boilers, bathrooms, showers, radiators and commercial boiler rooms.




How it works
Three steps, no surprises
Tell us what you need
Call or send an enquiry. We look at the job and your existing system, and talk through what you want.
Written quote
You receive a clear quote with the price and a start date. Nothing begins until you agree it.
Work and handover
We do the work carefully, test everything, tidy up and show you how it all works.
Areas covered
Working across Watford, Hertfordshire and North West London
From our base in Watford we work in homes within about ten miles, from St Albans, Harpenden and Hatfield across to Amersham, and down into Harrow, Edgware, Mill Hill and Barnet. We also cover Kingsbury, Willesden, Kilburn and Hampstead.
Hertfordshire & Buckinghamshire
Questions
Frequently asked questions
Are your quotes free?
Yes, every quote is free. We look at the job properly and send a written price, and nothing starts until you are happy with it.
Are you Gas Safe registered?
Yes. MJ Services is on the Gas Safe Register, registration number 528469, and you can check it yourself at gassaferegister.co.uk. All gas work is carried out by Gas Safe registered engineers.
Which areas do you cover?
We cover Watford and roughly ten miles around it. That includes Bushey, St Albans, Harpenden, Hatfield, Potters Bar, Borehamwood, Radlett, Rickmansworth and Amersham, and in North West London Harrow, Pinner, Northwood, Stanmore, Edgware, Mill Hill and Barnet.
Do you install underfloor heating?
Yes, underfloor heating is one of our specialities. We plan it around your floor, your rooms and your heat source, and fit it in extensions, kitchens, bathrooms and whole floors.
Do new boilers come with a warranty?
Yes. We are an approved installer for Vaillant, Worcester Bosch, Baxi and Glow-worm, so new boilers come with a manufacturer's warranty, and new Vaillant boilers we fit can come with up to 7 years, depending on the model. We register the boiler with the manufacturer for you, and an annual service keeps the warranty valid.
How long does a new boiler installation take?
A like-for-like boiler replacement is usually done in a day. Moving the boiler or changing the type of system takes longer, and we give you a clear timescale with your quote.
Do you provide landlord gas safety certificates?
Yes. We carry out annual landlord gas safety checks, issue the certificate and can arrange access directly with your tenants.
Get in touch
Planning a new boiler or underfloor heating?
Call or send an enquiry and we will get back to you with a free quote.
