Question to the Department for Levelling Up, Housing & Communities:

To ask the Secretary of State for Communities and Local Government, how many housing developments in England have roads or sewerage requiring adoption after more than five years of occupation by residents.

The Department does not hold the information you request because, although the Building Regulations require new housing to have adequate drainage and access, there is no requirement for all roads or sewerage to be adopted as a matter of course. This is a matter for the developer.