I had a small extension with pitch roof completed approx 5 years ago. The Building Inspector was involved throughout and a completion certificate was given and all his stipulations adhered to. However, the roof is now like a sieve as the pitch of the roof is totally inadequate for the tiles used. My builder has gone into liquidation and I recall that the roofing was sub contracted, to whom I don't know. I contacted Building Regs and they say their responsibiloity expires after 2 years from date of completion notice. I pointed out that had they noticed this problem whilst gthe build was going on, it could have been rectified with minimal cost and upheaval. Do I have any lehal rights regarding this?