UK SIC 2007 · 81221
Window cleaning services
Window cleaning services is UK SIC code 81221, part of division 81 (Services to buildings and landscape activities) in the SIC 2007 classification. As of the July 2026 Companies House register, 4,899 active UK companies list 81221 among their SIC codes, and 2,761 list it as their first code.
As of the July 2026 Companies House register, 4,899 active UK companies list 81221 among their SIC codes (2,761 as their first code).
Companies House data refreshed daily. Page reviewed July 2026.
Division 81: Services to buildings and landscape activities
Services to buildings and landscape activities is the home of the cleaning and grounds trades. General building cleaning sits under 81210, with 81299 collecting other cleaning services and 81222 marking specialised work such as trauma, industrial or high-level cleaning. Window cleaners have 81221, wider building and industrial cleaning 81229, and landscapers, one of the division's biggest populations, register under 81300. 81100 identifies combined facilities support providers that bundle cleaning, maintenance and reception into one contract, usually the largest companies in the division.
These are classic local service businesses, so the prospectors are equally familiar: insurance brokers selling public liability, accountants chasing new incorporations, job scheduling and quoting apps, equipment and chemical suppliers, and franchisors recruiting operators. Commercial cleaning and facilities firms also appear on procurement radars for offices, schools and managing agents seeking contractors. A no-website flag is common and signals a word-of-mouth operator, exactly the audience website builders and local SEO services convert best, while growth marks firms stepping from domestic into contract work.
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Where SIC 81221 clusters in the UK
About SIC 81221
How many UK companies use SIC code 81221?
4,899 active UK companies include 81221 (Window cleaning services) among their up-to-four registered SIC codes, of which 2,761 list it first. Figures are from the July 2026 Companies House register snapshot, counting active companies only.
Which SIC code should a domestic cleaning company use?
Most domestic and general cleaners register 81210, general cleaning of buildings, with 81299 available for services that do not fit the standard categories and 81221 specifically for window cleaning. There is no wrong-answer penalty: Companies House applies no approval process, and you can refine your codes on any confirmation statement (CS01). Businesses covering several trades often list two or three codes, up to the maximum of 4.
Is landscaping under this division or under construction?
Ongoing landscape services, planting, grounds maintenance and gardening for clients, sit under 81300 in this division. Hard landscaping that is really construction work, such as building patios, driveways or retaining walls, fits better under division 43 codes, and landscape design belongs with the architects under 71112. Firms spanning design, build and maintenance legitimately hold codes from more than one division.
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