Water and other utility companies' failure to provide timely connections for new homes is being blamed for exacerbating Britain's housing crisis.
Housebuilders are having to wait up to a year before new homes are connected to water and sewage networks according to the How to Build More Homes faster report by the Housing Finance Institute.
Every water company in England failed its sewerage targets for housebuilding as an average over the 2015 published period, the report found.
It also found said that despite Ofgem reporting greater customer satisfaction in 2015, developers still had problems with connections to the electricity network.
"There is mounting evidence that the performance of some utilities provision is adversely impacting on housebuilding," it said.
"Some water companies are failing to respond to needs for housebuilders in making timely and effective sewerage and water connections. This poor experience of the water industry seems to impact on larger and smaller builders alike."