{"entry-date":"2025-10-20","start-date":"1977-03-23","end-date":"","entity":11500206,"name":"Development within the curtilage of a dwellinghouse","dataset":"permitted-development-right","typology":"category","reference":"I1-1977","prefix":"permitted-development-right","organisation-entity":600001,"geometry":"","point":"","quality":"authoritative","notes":"None","description":"The enlargement, improvement or other alteration of a dwellinghouse so long as: (a) the cubic content of the original dwellinghouse (as ascertained by external measurement) is not exceeded by more than 50 cubic metres or one-tenth whichever is the greater, subject to a maximum of 115 cubic metres: (b) the height of the building as so enlarged, altered or improved does not exceed the height of the highest part of the roof of the original dwellinghouse; (c) no part of the building as so enlarged, altered or improved projects beyond the forewardmost part of any wall of the original dwellinghouse which fronts on a highway: Provided that the erection of a garage, stable loose-box or coach-house within the curtilage of the dwellinghouse shall be treated as the enlargement of the dwellinghouse for all purposes of this permission including the calculation of cubic contents.","documentation-url":"https://www.legislation.gov.uk/uksi/1977/289/pdfs/uksi_19770289_en.pdf","permitted-development-right-part":"I","permitted-development-right-class":"1"}