The house extension was completed three and a half years ago, but the flat roof is now leaking.
I had a private building control company checking my building works at the time. They signed off and gave me a certificate for "Single storey Side/Rear extension and new roof".
Now the structure leaks, there is some doubt about whether the upstands for rooflights were efficiently insulated - which could be causing condensation.
We have a Cure It GRP roof, which has cracked in places and there is a soft patch. Oriented strand board (OSB) was used for this, and I believe this is a warm roof.
Can I sue the building control officer for signing off poor construction? The builder has voluntarily liquidated last year.