About us

Established in 1993, Gas Mark 1 have built a reputation as one of the leading providers of domestic heating and plumbing services in the local area. Working from our Watford showroom, we continue to be a family-run reliable business with a real emphasis on quality installations, great value for money and a dedication to professional and friendly customer service.

Gas Mark 1 are known for the broad range of installation and maintenance services we are able to provide and have specialists in.

We have dedicated teams able to carry out the following:

  • Boiler and Central Heating installations (Fully Gas Safe Registered)

  • Fireplace Installations

  • Kitchen and Bedroom Installations

  • Underfloor Heating, Solar Heating, Warm Air Heating

  • Plumbing and Heating Maintenance, Breakdowns and Repairs

  • Bathroom Installations

  • Boiler servicing and Landlord Gas Safety Certificates

  • Free no obligation site surveys

Fully qualified in-house engineers

All our fully qualified engineers are trained in-house through our apprenticeship scheme, which has enabled us to build a loyal and dedicated team with a broad range of skills, able to carry out a large range of services. We believe training apprentices is one of the most important aspects of our business as our development program ensures we can produce high quality engineers and develop individuals you’ll be happy to have in your home.

Gas Mark 1 team

Kickstart Your Career with a Local Apprenticeship

We’re proud to support our community by offering apprenticeships that give hands-on experience and real qualifications. Learn from our expert team, develop valuable skills, and start a career you can be proud of

Visit us at our large Watford showroom

Gas Mark 1 is based out of a large 4 storey, 8000 square foot showroom in Watford, Hertfordshire, with dedicated expert showroom team on-hand to provide you with helpful, knowledgeable free advice.

The showroom is shared with our sister company Herts Bathrooms and Kitchens, who have a comprehensive selection of Bathrooms, Kitchens and Bedrooms on display. We work together with Herts Bathrooms and Kitchens to provide you with a complete ‘one-stop shop’, from design, through supply and full installation service.

Wayne Harris profile picture
Wayne Harris
3 months ago
We’ve recently had three bathrooms fully refurbished along with a complete new heating system and boiler relocation, and our experience from start to finish has been fully deserving of five stars.

The whole team have been very professional throughout. From our first visit to the showroom and throughout consultations, site surveys and delivery of the project, the communication has been clear and consistent, and nothing ever felt like too much trouble — the team have a genuine “can do” attitude and creative approach that is focused on delivering great service and a fantastic end result.

The project has felt like a partnership rather than a blunt client/contractor relationship and they have worked with us from the start to explain options, offer suggestions and work with us to get the details right.
Just as importantly, they were reliable and respectful of our home — turning up when they said they would, keeping things tidy, and keeping the schedule on track.

Stew was extremely helpful during the consultation and design process and Jason was incredibly meticulous with the central heating works.
Special mention goes to Tom H. for his attention to detail and for working tirelessly to ensure that we were satisfied.

We’ll definitely be using Gas Mark 1 / Herts Bathrooms again for future work and wouldn’t hesitate to recommend them.
A nice experience. We recently refurbished our bathroom and these guys were great. We were very impressed by their total attention to detail, their focus on the job and the way they made every effort not to leave any debris or waste behind them. Thank you!
Jo Windmill profile picture
Jo Windmill
4 months ago
Tom and Harry, really professional - great job! Would recommend. Thank you 🙏
Kevin Petty profile picture
Kevin Petty
6 months ago
Thanks to Charlie, Tom and all the team for a fantastic job. We are delighted with our new bathroom. From start to finish great care and organisation has been taken to keep disruption to a minimum.
We have no hesitation in recommending Gas Mark 1
James profile picture
James
6 months ago
Very happy customers! Gas Mark 1 and Herts Bathrooms were excellent every step of the way. Communication was fantastic throughout and the work was undertaken to our complete satisfaction. Gareth (engineer) and his team were polite, considerate and very easy to get on with. Highly recommended
Libby Pfeiffer profile picture
Libby Pfeiffer
6 months ago
We are delighted with our new kitchen. It is lovely and most importantly, it was put in so well by GasMark1.
Alex and co were totally professional, polite (and nice).
Special mention and thanks for Alex, a Perfectionist!
Natasha Proctor profile picture
Natasha Proctor
6 months ago
Would absolutely recommend Gas Mark 1 - we got our boiler replaced, a new radiator installed and an electric shower put in the bathroom and the team were brilliant. Always arrived on time each day, were very knowledgeable and great at explaining what was happening and left the house without any mess. We'll be getting them back in for work on the kitchen next!
Coral profile picture
Coral
7 months ago
We had Gas Mark 1 round to install our washing machine. Barney visited this morning to survey the job and managed to get two guys to install a couple of hours later. Great service as usual. They installed our kitchen 7 years ago and were reliable then. Great to see their customer service is still the same as are the three guys that came today, so not a high staff turnover.
Wouldn't hesitate in recommending this company.