 A gang of housebuilders are pencilled in for trading updates in the coming week, three of which are FTSE 100 companies and two are mid-sized. The sector has subsided badly under the tower of investor concerns about higher interest rates, lower mortgage availability, the end of Help to Buy and sagging consumer sentiment, twinned with rising industry costs and planning logjams though some of the more optimistic analysts see this as a buying opportunity. 