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

Conditions
This section has no associated Explanatory Memorandum

F.2  Development is permitted by Class F subject to the following conditions—

(a)any office building as extended or altered is only used as part of, or for a purpose incidental to, the use of that office building;

(b)any extension is, in the case of article 2(3) land, constructed using materials which have a similar external appearance to those used for the building being extended; and

(c)any alteration is at ground floor level only.