Forty-eight firms — 26 limited companies, 12 sole traders — weighted toward plumbing-and-heating generalists, with specialist clusters: 14 in underfloor heating, ten in bathroom installation, ten on renewables, and nine on air-source heat pumps. Nine firms belong to GBTEA. St Sampson leads on 10, St Peter Port and Vale on 8 each. —
Thirty-five heating engineers — 23 doing central heating, 13 underfloor, nine fitting air-source heat pumps alongside oil work.
Thirty-four plumbers island-wide — 21 limited companies to eight sole traders, weighted toward St Sampson (6) and the north.
Four Gas Safe firms on the island — the oldest trading since 1993, the newest opened 2025 and won that year's Norman Piette award.
One firm per niche, picked for editorial depth.
Plumbing and heating for domestic and commercial clients; Bpec, Oftec registered
Plumbing and heating services; bathroom, boiler, renewable energy installations
Gas engineer service; underfloor heating and heat pump specialists
self-funding States Trading Asset; municipal, maintenance, emergency services