PPS 21 Sustainable Development in the Countryside·Page 30·5.31
Justification – Functional Necessity and Security Considerations
Established businesses operating satisfactorily without residential accommodation must demonstrate why accommodation is now necessary for proper functioning. Security concerns alone are insufficient justification for granting planning permission.
A business which has been operating satisfactorily without residential accommodation will be expected to demonstrate why accommodation is now considered necessary in order to enable the enterprise to function properly. Furthermore it should be noted that the need to provide improved security from theft and/or vandalism by having someone living on the site is unlikely on its own to warrant the grant of planning permission.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/PPS 21 - Sustainable Development in the Countryside.pdf