Belfast·SPG004 Residential Extensions and Alterations·Page 15·4.1.2

Exceptions for larger extensions and rear positioning

Larger extensions may be permitted where necessary to upgrade small dwellings to modern standards, and rear extensions are often the most appropriate position, particularly in conservation areas where side extensions are generally unsatisfactory.

Notwithstanding this, it is accepted that on occasion a larger extension may be required, for example, to facilitate the renovation or upgrading of a small dwelling to meet modern amenity standards. And, in many cases the most appropriate position for a proposed extension is to the rear of the main building, particularly in conservation areas where side extensions are generally unsatisfactory.

Source — /Users/richardhill/Documents/planning-arch-project/data/documents/belfast/SPG004 Residential Extensions and Alterations.pdf