Tax & Finance
CIL (Community Infrastructure Levy)
Definition
A charge that local authorities can levy on new development to help fund infrastructure like roads, schools, and health facilities. CIL is calculated per square metre of new floor space. Some developments are exempt (self-builds, affordable housing, minor extensions). Not all councils have adopted CIL.
Why it matters
If you're extending a property or building on your land, CIL may apply and can add thousands to the cost. Self-builders can claim exemption but must apply before work starts — retrospective claims are not accepted.
Related terms
Research a property with AI
Paste a Rightmove, Zoopla or OnTheMarket link and get instant AI analysis — red flags, fair valuation, and neighbourhood data.