The need for more affordable homes across the country is fully appreciated, and Linden Homes and Miller Homes have already committed to delivery of a policy compliant 30% affordable housing on the first part of the West of Chichester site, equating to 225 new affordable homes. However, the new NPPF places more emphasis on testing the viability of development at plan making stage rather than on a site by site basis (paragraph 57, NPPF). This, coupled with the Council's suggested additional requirements relating to such things as optional technical standards, stricter housing mix criteria and sustainable design standards, all place significant additional burden on a sites viability than was the case when policy 34: Affordable Housing, was adopted. It also does not appear to take account of potentially high provision of infrastructure costs required on larger strategic sites, such as West if Chichester. The draft policy DM1 maintains a requirement to provide 30% affordable housing, and it is not clear whether this takes account of these additional viability burdens and the national policy shift towards assessing viability at local plan preparation stage.