Why do I need a completion certificate for building work in my house?
Why is it important to have a completion certificate for certain types of construction work in your house? Here's why...
A completion certificate helps ensure building work is safe

When building work has been inspected by suitably competent building control surveyors, with a completion certificate issued at the end, it means that as far as the surveyor is able to ascertain, the work done has complied with the building regulations. When building control surveyors carry out inspections on your property they'll assess things like the following (these will vary and be pre-agreed depending on your project):
- foundations
- ground and floors
- roof structure
- structural stability
- thermal insulation
- ventilation
- fire protection
- damp proofing
- drainage
(View our Do I need a building regulations application page for further details.)
Please note they will only visit the site periodically (when requested to do so by you or your builder) so won’t see everything. They will check the work at pre-agreed stages to ensure that it appears to comply and issue a completion certificate only if no contraventions are apparent after the final inspection.
You can find out more about getting building control approval in our 5 steps to building regulations approval page.
Additional work may be costly without building regulations approval
If the council discovers that building work on your property doesn't meet building regulations they could take enforcement action against you within 12 months of the date the work was finished. This will require you to carry out alterations or even remove the work, causing a great deal of disruption, inconvenience and money. If you don't take the necessary action, the local authority has the power to undertake the work itself and recover the costs from you since you're the property owner.
Properties without a building control certificate sell for less
A house that has had a considerable amount of work done without building regulations approval may well sell for less. The absence of a completion certificate can deter buyers because there is an element of uncertainty and fewer guarantees that the building work is safe and meets the standards set in the building regulations.
Completion certificates show up in local authority searches

Local authority searches, also known as local land searches, are conducted by conveyancing solicitors or mortgage lenders and they're an essential part of the home buying and selling process. If you're selling your property the information uncovered in these searches, including missing completion certificates, can be used by buyers to renegotiate your offer. This could lead to a deal falling through – the last thing you want at this stage.
Mortgage lenders need to know the details
If you're looking to take out a mortgage to buy a property, you'll need to let your mortgage lender know if the property has had work done which requires building regulations approval. If there's no completion certificate it introduces an element of risk for the mortgage lender and they'll most likely need some form of protection from the risks.
Buildings insurance may be invalid without a completion certificate
It's important to remember that if there's no completion certificate for alterations to your property, your insurance company may refuse to pay out and you may have to cover the cost yourself.
Peace of mind

All in all, having a completion certificate is a win. As a house buyer, seeing home improvement work accompanied by a completion certificate will give you confidence that building work has complied with building regulations.
When it comes to selling your home, building work that comes with a completion certificate will help make the process less problematic – allowing you to move swiftly on and start a new life elsewhere!
No building regulations approval? What's the solution?
Visit this page to find out: https://www.labc.co.uk/news/no-building-regulations-approval-whats-solution
Where can I get a copy of my building certificate?
Visit this page to find out: https://www.labc.co.uk/homeowners/where-can-i-get-copy-my-building-certificate
Further information
There's a wealth of home improvements information on LABC's Front Door website.