Where unauthorised work has been carried out, with no notice given nor plans submitted, an application can be made to Building Control for a Regularisation Certificate. Regularisation applications can be made for both domestic and non-domestic works commenced on or after 1 October 1973. Work completed prior to this date is not covered by the Regularisation procedure. Drawings of work carried out may or may not be required.

Inspections will be carried out to ascertain whether or not the work complies with Building Regulations. This may necessitate opening up of the works and carrying out tests. The applicant will be notified of any work required to bring the building to the standards in force when the original work was carried out. When this work has been satisfactorily completed, or if no further work is necessary, a Regularisation Certificate will be issued.

There is no legal requirement to apply for a Regularisation Certificate, however there is a legal requirement to comply with Building Regulations. Failure in this regard is an offence in law and may create problems when the property changes ownership.