The calculation of density standards is a difficult subject. It is always important to start first with an understanding of what the net developable area of a site may be irrespective of whether it is brownfield or greenfield. It will be necessary to have regard to site constraints, parking requirements, offset distances, green infrastructure requirements, drainage requirements etc. All these factors can significantly limit the net developable area on a site. It is important not to overestimate densities which could be achieved when identifying sites to be released for development. Once schemes provide more than 40 dwellings per net developable acre the density will usually require some element of flatted development.

The insistence on 35 dph as a minimum could well be problematic on greenfield sites, particularly if these are expected to accommodate significant areas of green infrastructure.

We would suggest that the policy should be targeted to provide densities of 30 to 40 dph depending upon site specific circumstances. High densities could be achieved in more centralised locations adjoining transport hubs, again subject to achieving acceptable design standards. We have explained elsewhere the importance of ensuring that development management expectations need to be married to strategic housing requirement delivery objectives.