Information on housing density is not compiled centrally.
We do however have the density of new build dwellings averaged over a four-year period. These are provided at local authority level on the CLG website in Live table P232. The web address for Live table P232 is:
http://www.communities.gov.uk/documents/plariningandbuilding/xls/822906.xls
The average density of new build dwellings for the period 2003 to 2006 for the unitary authority of Bournemouth was 70 dwellings per hectare.