UK SIC 2007 · 43220
Plumbing, heat and air-conditioning installation
UK plumbers, heating engineers, and HVAC contractors, domestic and commercial. Includes boiler installations, central heating, AC fit-outs, and ventilation systems. Distinct from 43222 (other heat installation, niche industrial work).
As of the July 2026 Companies House register, 49,582 active UK companies list 43220 among their SIC codes (42,076 as their first code).
Companies House data refreshed daily. Page reviewed July 2026.
Division 43: Specialised construction activities
Division 43 is the trades division, and one of the largest classifications on the UK register. Electricians register under 43210, plumbing and heating engineers under 43220, roofers under 43910, and plasterers, painters, glaziers, floorers and scaffolders each under their own code. Two broad codes swell the numbers further: 43999 for specialised activities not elsewhere classified and 43390 for other building completion and finishing, both catch-alls that absorb general trades and multi-skilled firms. Most companies are small, many being a single tradesperson who incorporated for contracting or tax reasons.
The trades are relentlessly prospected because their needs are predictable and recurring: public liability insurance, accountancy for CIS refunds and limited company compliance, van leasing, tool suppliers and merchants offering trade credit. Lead generation and website services target the no-website majority, since a tradesperson visible on the register but invisible on search is losing local work. New incorporations are the standout signal, usually marking the jump from sole trader to limited company when insurance, banking and bookkeeping all get chosen within weeks. Heating firms under 43220 also draw sellers of renewables kit, especially heat pump distributors.
Related SIC codes
43210, Electrical installation43222, Other heat installation43229, Other plumbing-related installation activitiesWho uses this code in B2B outreach
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Where SIC 43220 clusters in the UK
About SIC 43220
Are gas-safe heating engineers a separate SIC?
No, gas-safe registration is a regulatory status, not a SIC distinction. UK heating engineers all file 43220 regardless of which fuel types they're certified for.
How seasonal are SIC 43220 prospects?
Heavily, winter (Sept-Feb) is the busy season. Outreach targeting plumbers tends to perform better in spring/summer when they have more inbox attention.
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