London : Règlement no PS-6, art. 4.2(a) — Fence By-law

a residential lot line abuts natural/open spaces, public walkways or trails or other adjacent uses which may require increased security measures;

• (b) residential lands abut highways, commercial, and/or industrial zones and where concerns about noise are being attenuated by some form of soundproofing and/or noise attenuation;
• (c) or any other circumstances that may warrant consideration for minor exemption at the discretion of the Director, Municipal Compliance or designate. Part 5 - PRIVACY SCREENS