Plumbing, heat and air-conditioning installation (SIC code 43220)
Plumbers, heating engineers and HVAC contractors file here, home and commercial alike. Boiler installs, central heating, AC fit-outs and ventilation systems all count. Do not confuse it with 43222 (other heat installation), which is niche industrial work.
49,610active UK companies list SIC 43220 among their codes on the public recordCompanies House · counts as of August 2026
SIC 43220 in numbers
49,610 companies is 0.96 per cent of the 5,190,464 active companies on the UK register. 43220 is the 4th most used of the 15 codes we track in division 43.
42,050 put 43220 first and 7,560, 15 per cent, list it in one of their other three slots. First code only gives the tighter list; any position gives more of them.
ACTIVE COMPANIES BY REGISTERED-OFFICE POST TOWN (WHERE THE PAPERWORK SITS, NOT NECESSARILY THE WORK) · COMPANIES HOUSE PUBLIC RECORD, AUGUST 2026
London is the largest cluster at 10 per cent and the top five post towns hold 15 per cent, so the other 85 per cent sit across the rest of the country. A regional filter narrows the list without gutting it.
A worked example: 43220, registered office in London, incorporated in the last ninety days, from a pool of 49,610. Each lead you get arrives with a working website and a real email, and the director's name when the record has one. If we cannot complete one, you pay nothing.
SIC 43220 companies, as leads
Live rows from the enriched public record. Email addresses are withheld until you sign up. Phone numbers come with paid plans.
Plumbers in one town or city
Choose a place and see 3 of them there, before you sign up.
Tell us who you sell to. We find them, with a real email. 100 free leads, no card.
This is the trades division, and one of the biggest classifications on the UK register.
Related SIC codes
How to read SIC 43220
SIC 43220 reads as division 43 (specialised construction activities), group 432, class 4322, then the full five digits, inside section F, construction. A company picks its own codes, up to four, and Companies House does not check them, so 43220 is the company's own description of what it does, and 42,050 list it first where 49,610 list it anywhere.
Who sells into division 43
Lots of firms sell to the trades, because their needs are predictable and repeat every year. They buy public liability insurance, accountancy for CIS refunds and company compliance, van leasing, tools and trade credit from merchants.
About SIC 43220
Are gas-safe heating engineers a separate SIC?
No. Gas-safe registration is a licence, not a SIC split. Every UK heating engineer files 43220, whatever fuel types they are signed off for.
How seasonal are SIC 43220 firms?
Very. Winter (Sept to Feb) is the busy season. Emails to plumbers land better in spring and summer. That is when they have time to read their inbox.
Find UK SIC 43220 companies
Filter Companies House by this code. Each lead arrives with a working website and a real email, or you pay nothing. 100 free leads, no card.
✓ No card · ✓ 100 free leads · ✓ Nothing to cancel