Graham Trotter
Hi, normal procedure would be going through building control at your local council,which would mean your builder has informed council what he is doing either with a building notice or full plans permission,the council will then send a building inspector to inspect your works at different stages of the build,if any electrical work has been done the electrician will have to supply a certificate,your builder would have had to pay the council and a normal cost for a extension would be around £500,if the council are happy with the finished job they will send the householder a certificate within two weeks.if you were at home while building work was undertaken you should have seen a building inspector at some point visiting your house,if you didnt then its possible your builder hasnt obtained them.
