About Class Q Checker
Check whether an agricultural building in England can be converted to a home under Class Q permitted development, against the current rules.
What is on this site
One question, "class q barn conversion", answered with a checker that works on the page with no account, 4 guides on the questions around it, a data table you can cite (the figures and their method), and the sources every figure rests on.
- What changed for Class Q on 21 May 2024: Class Q was substituted on 21 May 2024: 10 homes instead of 5, 150 sq m each instead of two size classes, a new date test and a permitted rear extension.
- Class Q prior approval: the seven matters and the 56 day clock: Class Q is conditional on applying to the council for prior approval. What you must submit, what the council can assess, and when you can lawfully start.
- Class Q size limits: 150 sq m per home, 10 homes, 1,000 sq m: How the Class Q floor space limits work, how previous conversions on the same unit count, and exactly what the permitted rear extension may and may not do.
- Class Q refused or ruled out: what your options actually are: Appeal, resubmit or apply for full planning permission. What each route is for when a Class Q barn conversion is refused or blocked by a condition.
Reach us
Contact for a question about the site, or enquiries@classqchecker.co.uk. The legal terms are on Terms and Privacy.
Class Q Checker is an independent information site operated by Ellul Solutions Ltd. It is not affiliated with any local planning authority, the Planning Inspectorate or any government department, and nothing here is planning or legal advice. It covers England only, and it cannot see your site: designations, use history and structural condition all have to be confirmed locally before you rely on a Class Q route.