Yes, while the builder should have Construction and public liability insurance in place, there will be no insurance once the project is at lock up. Note well: it is very difficult for you as an Owner builder to find an insurer to supply you insurance at lock up the smartest thing to do is take out the insurance at commencement, even though you are doubling up, it will be a lot, cheaper to do it this way than try to obtain the insurance at lock up.