Try ringing FBD insurances or a broker that does FBD home cover. Before I moved into my house, I had to have tilers, floor installers, plumber, electrician, landscapers do work in and around the house, after the builders moved out. In order to take possession of the house and have the mortgage released, FBD provided cover on what they referred to as I think a "reconstruction / fire only" basis which I converted to full cover, including contents, once I moved in - painless and seamless and kept BoI happy.
It cost slightly less than the full cover for the 2 months.