Development of building projects (SIC code 41100)
UK property developers use this code. They buy land, run the build, then sell or keep the finished building. It takes in housing developers building on spec as well as commercial and mixed-use firms.
109,402active UK companies list SIC 41100 among their codes on the public recordCompanies House · counts as of August 2026
SIC 41100 in numbers
109,402 companies is 2.1 per cent of the 5,190,464 active companies on the UK register. 41100 is the most used of the 3 codes we track in division 41.
108,180 of the 109,402 put 41100 first, and only 1,222 carry it as a second, third or fourth code. The code on its own is a clean filter.
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 18 per cent and the top five post towns hold 23 per cent, so the other 77 per cent sit across the rest of the country. A regional filter narrows the list without gutting it.
A worked example: 41100, registered office in London, incorporated in the last ninety days, from a pool of 109,402. 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 41100 companies, as leads
Live rows from the enriched public record. Email addresses are withheld until you sign up. Phone numbers come with paid plans.
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Division 41 is one of the most used classifications on the UK register.
Related SIC codes
How to read SIC 41100
SIC 41100 reads as division 41 (construction of buildings), group 411, class 4110, 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 41100 is the company's own description of what it does, and 108,180 list it first where 109,402 list it anywhere.
Who sells into division 41
The construction supply chain sells into this division from every side. Builders' merchants and tool hire firms want trade accounts.
About SIC 41100
How do I tell SIC 41100 developers from contractors?
Developers buy the land and run the project. Contractors (41201, 41202) do the building. A pure developer hands the build to one of them. Many developer ltds file both codes anyway.
Why are so many SIC 41100 companies sole-director?
Most UK schemes get their own company, one per project. That ring-fences the financial risk. This single-purpose vehicle (SPV) usually has one director, the developer. When you build a list, aim at the parent company rather than the SPVs.
Find UK SIC 41100 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.
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