Belfast·SPG008 Advertising and Signage·Page 17·5.2.6
Poster panels in commercial areas
Poster panel displays may be acceptable in commercial areas where building scale is large enough to accommodate them. The scale of displays should respect adjacent buildings and the wider area.
In commercial areas the scale of buildings may be sufficiently large to accommodate poster panel displays without adverse effect on visual amenity. The scale of commercial and industrial surroundings in our cities and towns can however vary greatly, often within short distances. It will be expected therefore that the scale of advertisement displays should respect the scale of adjacent buildings and the wider area.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/belfast/SPG008 Advertising and Signage.pdf