PPS 12 Housing in Settlements·Page 37·HS 2
Social Housing Mix and Tenure Requirements
Planning permission for housing proposals will only be granted where a suitable mix of housing types and tenures is provided to meet identified market and social housing needs, with the proportion of land or units for social housing determined during development control.
In locations where a demonstrable housing need is identified by the Northern Ireland Housing Executive, planning permission for housing proposals will only be granted where provision is made for a suitable mix of housing types and tenures to meet the range of market and social housing needs identified.
The proportion of land or units to be set aside for social housing will be determined as part of the development control process.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/PPS 12 - Housing in Settlements.pdf