Additions etc to the roof of a dwellinghouse

The enlargement of a dwellinghouse consisting of an addition or alteration to its roof.

Development is not permitted by Class B if—

(a)permission to use the dwellinghouse as a dwellinghouse has been granted only by virtue of Class G, M, MA, N, P , PA or Q of Part 3 of this Schedule (changes of use);
(b)any part of the dwellinghouse would, as a result of the works, exceed the height of the highest part of the existing roof;
(c)any part of the dwellinghouse would, as a result of the works, extend beyond the plane of any existing roof slope which forms the principal elevation of the dwellinghouse and fronts a highway;
(d)the cubic content of the resulting roof space would exceed the cubic content of the original roof space by more than—
- (i)40 cubic metres in the case of a terrace house, or
- (ii)50 cubic metres in any other case;
(e)it would consist of or include—
- (i)the construction or provision of a verandah, balcony or raised platform, or
- (ii)the installation, alteration or replacement of a chimney, flue or soil and vent pipe; ...
(f)the dwellinghouse is on article 2(3) land ; ...
(g)the dwellinghouse is built under Part 20 of this Schedule (construction of new dwellinghouses) ; or
(h)the existing dwellinghouse has been enlarged in reliance on the permission granted by Class AA (enlargement of a dwellinghouse by construction of additional storeys).

Development is permitted by Class B subject to the following conditions—

(a)the materials used in any exterior work must be of a similar appearance to those used in the construction of the exterior of the existing dwellinghouse;
(b)the enlargement must be constructed so that—
(c)any window inserted on a wall or roof slope forming a side elevation of the dwellinghouse must be—

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Many forms of Permitted Development have conditions and a requirement for a Prior Approval application. Contact us to discuss your project.

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