For property developers and development companies that acquire land, plan, finance, and bring building projects to market. Often registered alongside one of the 41201 / 41202 codes that match the kind of buildings the developer puts up.
SIC codes for construction and building firms
Construction and building firms in the UK choose between four main SIC codes in division 41 (Construction of buildings) and division 42 (Civil engineering). The split is straightforward. 41100 covers developers who acquire land and bring building projects to market. 41201 covers contractors building commercial property like offices and warehouses. 41202 covers contractors building domestic property like houses and flats. 42110 covers civil engineering firms building roads and motorways. Most building firms register one of the 41xxx codes; developers register 41100 alongside whichever 41xxx fits the kind of buildings they put up. Larger construction firms that do both commercial and domestic work commonly register two codes, typically with 41201 as primary and 41202 as secondary or vice versa. Civil engineering specialists working on roads and motorways register 42110. The four codes below cover the umbrella construction space. Specialist trades have their own SIC sub-space in division 43.
SIC codes construction and building firms typically choose
For contractors and main builders constructing commercial property: offices, retail units, warehouses, factories, and other non-residential buildings.
For contractors and main builders constructing residential property: houses, flats, and other domestic dwellings. The default code for most UK house-building firms.
For civil engineering firms and highways contractors. Used by road-construction specialists, motorway maintenance contractors, and infrastructure construction businesses.
Frequently asked questions
Which SIC code should a UK house-builder register?
UK house-builders and residential construction contractors register 41202 (Construction of domestic buildings) as their primary SIC code. It covers contractors building houses, flats, and other residential property, whether for sale, rent, or third-party developers. Property developers who acquire the land and finance the build often register 41100 (Development of building projects) as primary, with 41202 added to reflect the construction activity.
What's the difference between SIC codes 41100, 41201, and 41202?
41100 is for development companies that acquire land and finance projects, regardless of who physically builds. 41201 is for contractors constructing commercial buildings like offices and warehouses. 41202 is for contractors constructing domestic buildings like houses and flats. A pure developer registers 41100. A pure builder registers 41201 or 41202 depending on building type. Firms doing both commonly register 41100 plus one or both of the 41201 and 41202 codes.
Where do specialist trades like plumbing and electrical fit in the SIC codes?
Specialist trades sit in division 43 (Specialised construction activities), separately from the umbrella construction codes in division 41. Electrical installation is 43210, plumbing is 43220, plastering is 43310, joinery is 43320, and so on. A construction firm that subcontracts trades registers an umbrella 41xxx code; a specialist trade contractor registers their specific 43xxx code as primary. Multi-discipline firms that both build and self-perform trades sometimes register codes across both divisions.