Blue Diamond Window Cleaning is a London, Ontario window-cleaning provider whose official contact details list 3 Langarth Street West and (519) 681-7827. The company serves homes and commercial properties in London and surrounding areas. Its published service scope includes residential interior and exterior window cleaning, office and storefront cleaning, high-rise cleaning, new-construction cleaning, eavestrough cleaning and pressure washing.

For residential appointments, the company says its window-cleaning service can include inside and outside glass, tracks, frames and screens. Its FAQ states that customers do not need to be present when access has been arranged, and that the company will notify them when work is complete. For commercial work, Blue Diamond identifies offices, storefronts, high-rise properties and new-construction projects among the property types it serves. It describes its high-rise service as using appropriate equipment, safety procedures and industry-approved methods.

The company states that it carries $5 million in liability insurance and is certified through WSIB. It also says it uses environmentally friendly cleaning solutions. Its published satisfaction process says that, if a customer is unhappy with the result, it will return to address the issue at no additional charge. These are company statements; consumers can confirm project scope, access requirements, scheduling and quote details directly before booking.

Blue Diamond states that it began in 1986. Its About page reports that Huber Window Cleaning acquired the business in 2025, while Blue Diamond continues to operate under its established name in London. Regular weekly business hours were not published on the official website at the time of research, so consumers should confirm appointment availability directly.

FiveBest summary: A London option for residential, commercial, high-rise and construction-related window cleaning, with documented eavestrough cleaning and pressure washing.