Fifty-one firms — 28 limited companies, 12 sole traders — anchored by a plumbing-and-central-heating core (29 and 24) with a distinct ten-firm renewables cohort covering air-source heat pumps. Eleven belong to the Guernsey Building Trades Employers Association; Guernsey Gas, the island's utility, traces to the 1820s. —
Forty-two heating engineers on the island — 14 in underfloor heating, 12 boiler installation, 11 air-source heat pumps.
Thirty-six plumbers — 20 limited companies, 10 sole traders — weighted toward St Sampson (8), with a renewables cohort of nine.
Seven gas engineers — six limited companies and one sole trader — anchored by Guernsey Gas, the island's utility with heritage to the 1820s.
One firm per niche, picked for editorial depth.
Plumbing and heating specialists — boilers, renewables, 24/7 emergency service.
Plumbing & heating: renovations, emergencies, boiler installs
Island gas utility — natural gas, bottled gas, and low-carbon alternatives.
Drainage specialists — unblocking, CCTV, lining, repairs, pressure washing.
Tagged in Plumbers & Heating Engineers but not in one of the specific niches above.