The Town and Country Planning (General Permitted Development) (England) Order 2015

Development not permitted

M.1  Development is not permitted by Class M—

(a) if the cumulative gross floor space of any buildings erected, extended or altered would exceed—

(i) 25% of the gross floor space of the original school, college, university or hospital buildings; or

(ii) 100 square metres,

whichever is the lesser;

(b) if any part of the development would be within 5 metres of a boundary of the curtilage of the premises;

(c) if, as a result of the development, any land used as a playing field at any time in the 5 years before the development commenced and remaining in this use could no longer be so used;

(d) if the height of any new building erected would exceed 5 metres;

(e) if the height of the building as extended or altered would exceed—

(i) if within 10 metres of a boundary of the curtilage of the premises, 5 metres; or

(ii) in all other cases, the height of the building being extended or altered;

(f) if the development would be within the curtilage of a listed building; or

(g) unless—

(i) in the case of school, college or university buildings, the predominant use of the existing buildings on the premises is for the provision of education;

(ii) in the case of hospital buildings, the predominant use of the existing buildings on the premises is for the provision of any medical or health services.