At Gas Mark 1, we have built up our reputation through the quality of our workmanship and a dedication to professional and friendly customer service. Our main priority is to ensure that every job is completed with the same level of service and quality to provide the highest standard of customer satisfaction. We pride ourselves on the fact that well over 50% of new work is generated by the recommendations of past customers.

See what some of our previous customers have to say below.

I am very happy with the quality of the work carried out. The engineers were all polite, courteous, knowledgable and respectful of my property. I would highly recommend Gas Mark 1 and will use them if the need arises in the future.

- Mr. P, Boiler / Central Heating Installation

We are delighted with the standard of the workmanship and the professionalism of staff. The bathroom and toilet looks fantastic. We will certainly recommend you.

- Ms. S, Bathroom Installation

Delighted with the work. We are already recommending you to family and friends.

- Mr. S, Kitchen Installation

Just wanted to pass on our many thanks and gratitude towards yourself and the company for all the hard work on our house. Jason has been fantastic and really hardworking over the 2 weeks. Everything is immaculate and has been carried out to such a high standard. We were so pleased that everything ran so smoothly and there were no typical 'builder' like delays or excuses. It was a great relief that we didn't have to organise anything. We are so pleased with all the work and have been happy throughout. We were really impressed with all the other workmen including the plasterer, electrician and tiler. There work has been to a very high standard also. Everyone at the showroom and especially Patrick were very patient with us and advised us very well. Please pass on our many thanks to Jason, the apprentice and the rest of their team for all their hard work. See you when we've got enough money for the kitchen to be done!

- Mr & Mrs C, Heating / Bathroom Installation

Excellent service, the fitters arrived promptly every day and discussed everything with us before commencing work. They cleared their mess before leaving including using the hoover. I would have no hesitation in recommending them.

- Mrs. C, Central Heating Installation

We've had a really good customer experience with the selection and installation of our new gas stove. Everyone at Gas Mark 1 has been really helpful and speedy with all matters. Thanks very much :-)

- Mrs. A, Fireplace Installation

I think all the work here is finished and we would like to just ask you to pass on our thanks to all the people that did the work. They were very helpful and understanding when we had to ask them to move/stop work, the pipework is very neat and tidy and the work was carried out with a minimum of disruption to us.

- Part Vet Centre, Central Heating Installation

It has been a pleasure dealing with everyone in your firm. Cosmetically the bathroom looks lovely. Your team worked quickly, efficiently, tidily with as little inconvenience to us as possible. They were all polite and asked for our input when decisions needed to be made and explained anything we didn't understand. They are a credit to your company and I would not hesitate to recommend you to anyone.

- Mr & Mrs N, Bathroom Installation

From the first consultation to completion of job we were so impressed with the standard and knowledge and quality of work. We felt our concerns had been addressed and the work carried out to a high standard. We would recommend your company without hesitation. First class job.

- Mrs. R, Boiler / Central Heating Installation

A Big Thank you to all the staff at Gas Mark 1. My wife and I really appreciate the work Jason and his colleague have done in our house, fitting the boiler and the fire - fantastic workmanship, very clean and tidy and professional. hey made the whole process very easy - my wife had been dreading it. All in all we are very, very pleased with Gas Mark 1 from sales to completion and we will be more than happy to recommend you to anyone else who needs a boiler fitting or wants a fire.

- Mr & Mrs M, Boiler / Fireplace Installation

Jason the heating technician was excellent explained everything well and has done an excellent job, will recommend Jason and Gas Mark 1.

- Mr S, Boiler / Central Heating Installation

Just a quick email to let you know that I am still in love with my bathroom (especially the shower) and my lovely, gorgeous, bright kitchen gives me a warm glow every time I enter it and I have even started cooking roast dinners in the oven you persuaded me to have fitted! I am now almost ready to get you in to quote for my bedroom furniture and will call in the not too distant future to book an appointment.

- Mrs H, Kitchen Installation

Thank you very much for making the arrangements for me to be reunited with Hot Water and Heating. I am very pleased with the services provided from all your superb team.

- Mrs R, Boiler Installation

Excellent scores across the board, your guys were friendly, professional and the quality of the installation is 1st class, couldn’t be happier, I have already recommended your firm to a few friends who are thinking of replacing their bathrooms...

- Mr B, Bathroom Installation

Third visit to our home, v grateful for work done. Clean, done exactly as hoped for.

- Mrs W, Kitchen Installation

We were very impressed with the work that Jason did, along with Rhys/ Reece. Both were very professional and thorough, clean and tidy and cared about the job that they were doing. They were friendly and answered any questions we had, clearly. ( Rhys ( Reece) has an excellent teacher.)

- Mr B, Boiler / Central Heating Installation

Impressed with the ability of staff to understand the problems with our previous system and their creative approach to finding a satisfactory solution.

- Mrs S, Boiler / Central Heating Installation

Excellent in every way - pleasant, informative and very tidy workmen. From quote to finish - brilliant and will definitely recommend. Only thing not so good was the wait to get it done but it was that time of year in November. Thank soooo much as temperatures are in the minuses now!

- Mrs. H, Boiler / Central Heating Installation

Thank you and your staff for the excellent work transforming my heating into an efficient 21st Century system. You sent me a great team, punctual, hardworking and efficient. Carl was unfazed by my awful system and worked hard to solve the challenges. Ashton was a hardworking and efficient colleague. I was really impressed by their attitude and work ethic plus they tidied up so well at the end of each day. Thank you for sending such a good team. They’re a credit to your company and you should be proud of them. I have now recommended your company to friends and neighbours. Thank you as well for the feeling I’m now living in a 5 star hotel.

- Mrs. T, Boiler / Central Heating Installation

Great to deal with a good local firm. Competitive and efficient service.

- Mr. S, Boiler / Central Heating Installation

Visit our showroom: 15-21 Market Street, Watford, Herts, WD18 0PA View Map