SIC code 81221 classifies businesses engaged in window cleaning services. There are 2,781 active companies registered under this code in the UK, forming a substantial sector within the national economy. It falls under Section N (Administrative and support service activities) of the UK SIC 2007 classification system, which is used by Companies House to categorise all registered businesses.
See the full industry analysis on the Window cleaning services industry page.
With a 89% survival rate, this sector shows strong business longevity. Only 2 of 3,123 companies registered under this code have dissolved, well below the UK average. The average company age of 6.3 years suggests a relatively young and dynamic sector, with many businesses having been established in recent years. Growth has been exceptional recently: 62% of all active companies were formed since 2020, marking this as one of the fastest-expanding classifications. The 2010s contributed another 27%, meaning the vast majority of businesses are relatively new. Companies are geographically dispersed across the UK, with no single location dominating. The top three locations — LONDON, NORMANTON, GLASGOW — together account for just 11% of the sector.
SIC code 81221 stands for "Window cleaning services" under the UK Standard Industrial Classification (SIC 2007) system. It belongs to Section N — Administrative and support service activities. Companies use this code when registering with Companies House to indicate their primary business activity. The code is required for annual confirmation statements and is used by HMRC, ONS, and other government bodies for statistical and regulatory purposes.
There are currently 2,781 active companies registered under SIC code 81221 in the UK, out of 3,123 total registrations. This gives a survival rate of 89%, meaning 11% of companies registered under this code have since dissolved. These figures are based on Companies House data and updated regularly.
The top locations for window cleaning services companies (SIC 81221) are: LONDON (229), NORMANTON (43), GLASGOW (36), LEEDS (34), SOUTHAMPTON (33). Geographic concentration can reflect local economic conditions, industry clusters, or proximity to key markets and supply chains.
The sector is growing: 62% of currently active SIC 81221 companies were formed since 2020, and 27% during the 2010s. This sustained formation rate indicates ongoing demand for window cleaning services services in the UK.
Companies classified under SIC 81221 have an average age of 6.3 years. This suggests a balanced sector with both established players and newer entrants.
Related SIC codes within the same division include: 81210 (General cleaning of buildings), 81300 (Landscape service activities), 81299 (Other cleaning services), 81222 (Specialised cleaning services). Companies may use multiple SIC codes if they operate across several of these related activities. When registering with Companies House, businesses should select the code that best represents their primary activity.
You can search for companies with SIC code 81221 (Window cleaning services) using UVAGATRON's company explorer, which allows filtering by SIC code, location, and company status. Alternatively, Companies House offers a basic search on their website. Our platform adds risk intelligence, director networks, and signals from 50+ government databases to each company record.
Search, filter, and analyse 2,781 companies classified under this SIC code with AI-powered risk intelligence.
Data sourced from Companies House, HM Land Registry, FCA Register, and 50+ government databases. SIC classification follows the UK Standard Industrial Classification of Economic Activities 2007 (SIC 2007). Last updated: 2026-04-17.