PPS 17 Control of Outdoor Advertisements·Page 24·Design Guidelines (clause 26)
Offices in Former Residential Properties Design Guidelines
Office advertisements in former residential properties should use metal nameplates fixed to doorway pilasters or masonry beside the front door, or painted/etched lettering on front windows.
• the advertisement of offices in former residential properties should be by means of nameplates made of metal or other suitable materials and should be fixed to the doorway pilaster, or if there is no pilaster, they may be fixed to the masonry beside the front door; and
• painted or etched lettering on a front window will also generally be acceptable.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/PPS 17 - Control of Outdoor Advertisements.pdf