Glossary
Regularisation certificate
A regularisation certificate is a Building Control approval sought for work that was already carried out without the required Building Regulations application. The building control body inspects what it can and may ask for opening-up works.
It is discretionary; not all unauthorised work can be regularised.
Similar late-approval routes exist under other nations’ building standards systems.
Official source: Regularisation (GOV.UK Building Regulations). Checked 27 October 2026.