Other building completion and finishing (SIC code 43390)
Other building completion and finishing is UK SIC code 43390. It sits in division 43 (Specialised construction activities) of the SIC 2007 list. On the August 2026 Companies House register, 54,813 active UK companies list 43390 among their SIC codes. 35,524 of them list it first. That makes it the third most used code in its division.
54,813active UK companies list SIC 43390 among their codes on the public recordCompanies House · counts as of August 2026
SIC 43390 in numbers
54,813 companies is 1.1 per cent of the 5,190,464 active companies on the UK register. 43390 is the third most used of the 15 codes we track in division 43.
35,524 put 43390 first and 19,289, 35 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 15 per cent and the top five post towns hold 20 per cent, so the other 80 per cent sit across the rest of the country. A regional filter narrows the list without gutting it.
A worked example: 43390, registered office in London, incorporated in the last ninety days, from a pool of 54,813. 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 43390 companies, as leads
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This is the trades division, and one of the biggest classifications on the UK register.
Related SIC codes
How to read SIC 43390
SIC 43390 reads as division 43 (specialised construction activities), group 433, class 4339, 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 43390 is the company's own description of what it does, and 35,524 list it first where 54,813 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 43390
How many UK companies use SIC code 43390?
54,813 active UK companies list 43390 (Other building completion and finishing) among their registered SIC codes. Each company may register up to four. Of those, 35,524 put it first. The figures come from the August 2026 Companies House register snapshot, and count active companies only.
Should a multi-trade builder use 43999 or a specific trade code?
If one trade brings in most of your income, use its own code. That means 43210 for electrical work or 43220 for plumbing and heating. Specific codes read better to insurers and merchants. Genuinely multi-skilled firms use 43999 or 43390, or list up to four codes covering their main trades. The choice is yours. Companies House records it without judgement, and you can change it on any confirmation statement.
Find UK SIC 43390 companies
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