UK SIC 2007 · 41100
Development of building projects
UK property developers, companies that buy land, manage construction projects, and sell or hold the finished buildings. Includes both speculative residential developers and commercial / mixed-use development companies.
As of the July 2026 Companies House register, 110,046 active UK companies list 41100 among their SIC codes (108,829 as their first code).
Companies House data refreshed daily. Page reviewed July 2026.
Division 41: Construction of buildings
Division 41 is one of the most heavily used classifications on the UK register. It divides into 41100, development of building projects, chosen by developers and by many companies set up to hold a single scheme, and the two building codes: 41202 for domestic construction, the natural home of house builders and residential contractors, and 41201 for commercial buildings. The developer code's popularity partly reflects property investors using it for development ventures, so not every 41100 company employs a single tradesperson.
The construction supply chain prospects this division from every direction: builders' merchants and tool hire opening trade accounts, insurance brokers arranging contract works and liability cover, accountants handling CIS and VAT reverse charge complications, and software firms selling estimating and project tools. Brokers and lenders offering development finance focus on 41100 incorporations, which often precede a land purchase. For contractors under 41202, a new incorporation frequently marks a sole trader taking the limited company step, an ideal moment for accountancy and insurance offers, while growth signals suggest bigger projects and bigger material spend.
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Where SIC 41100 clusters in the UK
About SIC 41100
How do I tell developers from contractors?
Developers (41100) buy land and manage projects; contractors (41201, 41202) physically build them. A pure developer typically sub-contracts the build to a 41201/41202 company. Many developer ltds file both codes.
Why are so many SIC 41100 companies sole-director?
Most UK property developments incorporate a single-purpose vehicle (SPV) per project to ring-fence financial liability. The SPV typically has one director (the developer themselves). For prospect targeting, the parent company is more interesting than the SPVs.
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