Scores based on 118 reviews

Reliability & timekeeping

Invoice history based on 74 reviews.

Invoice History
Charged as per quote / estimate100%
Appointments reported as missed (6 months) 0
Average score 9.86
118 reviews
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  • VAT registered
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If you require cost effective, reliable heating and plumbing engineers then look no further. Operating throughout South and Mid Wales to Bristol, Bath and Somerset we cater to all domestic and business client’s central heating systems, gas services and plumbing requirements.

Established in 1998 by British Gas trained G.M. Douglas in Bedwas near Caerphilly, G.M. Douglas Plumbing and Heating Ltd. has grown from a one man local operation to a regional company spanning all of South and Mid Wales to Bristol, Bath and Somerset.

With over 27 years’ experience and thousands of satisfied customers, we have the knowledge and expertise needed to ensure that you receive nothing but the best service. Our reputation has been developed through hard work and reliability which is why we are the area’s number one choice for plumbing & gas related work. 
We offer you the highest quality workmanship and services for:

  • Emergency callouts - 24/7 services
  • Gas Central Heating Installations carried out by Gas Safe registered Engineers
  • Cooker, Shower and Fire installations
  • Gas Boiler and Fire Annual Services
  • Commercial Catering
  • Landlord Safety Checks
  • Maintenance and Servicing of all Gas Appliances
  • LPG installations and servicing
  • Commercial Heating works
  • Worcester Bosch accredited installer
  • All Worcester Bosch boilers come with a 5-8 Year Parts and Labour Warranty


  • Emergency callouts - 24/7 services
  • All Plumbing Works both Major and Minor
  • Shower, Bath, Sink, and Toilet installations
  • Full Kitchen installations including plumbing, gas fitting, appliance fitting, carpentry, tiling and plastering
  • Full Bathroom installations including Tiling
  • Wet room installations

We are members of SMAS ensuring that we are always working to the highest standards. All our engineers are gas safe registered and are fully qualified in all aspects of plumbing and heating. 

Based in

Valley Enterprise, Caerphilly, Caerffili, CF83 8GF

Works in

Caerphilly, Cardiff, Barry, Pontypridd, Treharris, Caerffili