PPS 21 Sustainable Development in the Countryside·Page 26·5.23
Conversion permission does not permit subsequent replacement
Planning permission for conversion of a non-residential building to residential use alone does not justify subsequent replacement of that building with a new dwelling; any such replacement must meet the requirements of Policy CTY 3.
In addition it should be noted that his policy relates only to schemes of sympathetic conversion. The Department would therefore stress that a grant of planning permission for conversion of a non-residential building to residential use will not in itself be considered sufficient grounds to subsequently permit the replacement of the building with a new dwelling, unless the proposal meets the requirements of Policy CTY 3.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/PPS 21 - Sustainable Development in the Countryside.pdf