Belfast·SPG003 Residential Design·Page 33·3.1.40
Avoiding overshadowing in new residential development
New residential development should be sited and designed to avoid or minimise overshadowing of neighbouring dwellings, though some overshadowing of garden areas alone will rarely justify refusal of permission.
Where aspects of new residential development are poorly sited or badly designed, shadows may reduce daylight to neighbouring residential property(s) and adversely affect residential amenity to an unacceptable level. It is important, therefore, that every effort should be made to avoid or minimise the potential for overshadowing to neighbouring dwellings when drawing up plans for new residential development. However, some overshadowing of garden areas will rarely constitute sufficient grounds to justify a refusal of permission.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/belfast/SPG003 Residential Design.pdf