What happens if I don’t comply with the regulations?
Work carried out without Building Control Approval is classified as unauthorised. The Local Authority has powers to take legal action to require an application to be made and you may have to expose some areas of work for inspection to establish compliance with the Building Regulations. You could also be fined for failing to comply and/or pay to have offending work altered to meet Building Regulations. In extreme cases work may be required to be taken down.
The most serious problem will be the effect on any future house sale. Approval Notices and Completion Certificates are now needed as standard as part of conveyance so you may experience problems selling additionally your house insurance could be invalidated.