This is the Dwellings, Household Spaces and Accommodation Type data (KS401) from the 2011 Census. The data provides the number of dwellings and household spaces and the type of accommodation.
The question was:
What type of accommodation is this?
A whole house or bungalow that is:
terraced (including end-terrace)
A flat, maisonette or apartment that is:
in a purpose-built block of flats or tenement
part of a converted or shared house (including bedsits)
in a commercial building (for example, in an office building, hotel, or over a shop)
A mobile or temporary structure:
a caravan or other mobile or temporary structure
The 2011 census in England and Wales took place on 27th March 2011. It provides a snapshot of the population and its characteristics on that day.
Further information about the census estimates, including details about the methodology is available here: http://www.ons.gov.uk/ons/guide-method/census/2011/index.html