Construction of water projects (SIC code 42910)
Construction of water projects is UK SIC code 42910. It sits in division 42 (Civil engineering) of the SIC 2007 list. On the August 2026 Companies House register, 1,479 active UK companies list 42910 among their SIC codes. 930 of them list it first.
1,479active UK companies list SIC 42910 among their codes on the public recordCompanies House · counts as of August 2026
SIC 42910 in numbers
1,479 companies is 0.03 per cent of the 5,190,464 active companies on the UK register. 42910 is the 5th most used of the 7 codes we track in division 42.
930 put 42910 first and 549, 37 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 12 per cent and the top five post towns hold 17 per cent, so the other 83 per cent sit across the rest of the country. A regional filter narrows the list without gutting it.
A worked example: 42910, registered office in London, incorporated in the last ninety days, from a pool of 1,479. 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 42910 companies, as leads
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Civil engineering is about infrastructure, not buildings. Roads sit under 42110 and railways under 42120.
Related SIC codes
How to read SIC 42910
SIC 42910 reads as division 42 (civil engineering), group 429, class 4291, 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 42910 is the company's own description of what it does, and 930 list it first where 1,479 list it anywhere.
Who sells into division 42
Plant is at the heart of selling to civils firms. Hire companies, excavator and attachment dealers, fuel suppliers and operator training providers all work this division hard.
About SIC 42910
How many UK companies use SIC code 42910?
1,479 active UK companies list 42910 (Construction of water projects) among their registered SIC codes. Each company may register up to four. Of those, 930 put it first. The figures come from the August 2026 Companies House register snapshot, and count active companies only.
Is groundworks a division 42 or division 43 activity?
Both codes exist and the split is genuinely fuzzy. Site preparation and excavation is 43120. Broader civil engineering work fits 42990. Many groundworks contractors choose 42990, because their scope covers drainage, roads and structures. Others use 43120 for enabling works. Listing both is common and allowed within the four-code limit. Nothing is enforced on the choice. It is a self-declared classification.
Find UK SIC 42910 companies
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