Specialists in: Central Heating Boilers Fireplaces Kitchen & Bedroom Installations Plumbing Maintenance

Hassle-free installations and service you can depend on

Whether you require a new boiler, central heating system, fireplace, bathroom, kitchen, bedroom or plumbing maintenance work we have an expert team of heating and plumbing engineers ready to help.

Gas Mark 1 are the one-stop shop for all your home-interiors, providing first class installations and top quality customer service.

Based out of our Watford showroom, we have been serving the local area for over 20 years and whatever your requirements we can provide high standard cost-effective solutions to suit your needs.

Boiler Installation

Boiler Installations

We provide Hassle-free quality installations by our experienced Gas Safe registered engineers.

Central Heating

Central Heating Systems

From Underfloor heating to Solar hot water, we are specialists in the installation & upgrading of Central Heating Systems.

Reflex 75T Edge With Claremont Mantel


We offer a complete design, supply and installation package for your perfect fireplace or stove.


Other Appliances

We have a large range of kitchen appliances available to be supplied & fitted by our team.

Belran10 Hires

Kitchen/Bedroom Installations

We have multiple dedicated installation teams who are able to provide you with your dream kitchen or bedroom.


Bathroom Installations

Our experienced installation teams carry out bespoke bathroom installations to suit every taste and style.

Worcester Accreditted Installer Handover

Servicing & Landlord Certificates

Our engineers are available to ensure your appliances are safe and working effectively.

Worcester Gas Safe Installer

Heating Breakdown & Repairs

Our services include central heating system diagnostics & repairs, fires, cookers, as well as upgrades & power flushes.


Plumbing Maintenance Repairs

These services include emergency plumbing leaks, blockages, fitting sinks, shower pumps, tiling, plastering & more.

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