A bit off topic as not strictly diy so apologies, but thought i might get some good advice here. Had a window put in where there was a door and a door put in where there was a window. They were put in without a reveal or drip head yet this got signed off by building control. Lots of damp has penetrated through the fabric of the wall, twice the builder has come to fix it yet it is now worse than ever, now pooling on the ground it is so bad. So i want to get a different builder to sort it and invoice the old builder, who will no doubt not pay until we go to small claims. My question is whether to get building control to come back. Would they be helpful in drawing up what needs to be done so i have a solid case at small claims? Maybe i even have a claim against control? What do you think? Thanks