When most people think about window replacement, they think about homes. But commercial window replacement is a significant market in the GTA, driven by aging office buildings, retail renovations, and multi-unit residential buildings requiring energy upgrades. While residential and commercial windows serve the same basic function — letting in light while keeping out weather — they differ substantially in design, specification, and installation requirements.
The most fundamental difference is structural. Commercial windows must handle larger spans, higher wind loads, and in some cases, blast resistance requirements for buildings in high-traffic urban areas. They're typically made with thicker aluminum or thermally-broken aluminum frames rather than the vinyl or wood frames common in residential applications. These frames offer greater strength but require careful design to prevent thermal bridging — where cold from outside travels through the metal frame into the interior.
Glass specifications also differ. While residential windows often use standard Low-E glass, commercial applications frequently require tempered or laminated safety glass (sometimes both), especially at ground level, in large spans, or in buildings subject to occupancy loads. Spandrel glass — opaque glass that hides structural elements like floor slabs — is another uniquely commercial product.
From a code perspective, commercial windows fall under the Ontario Building Code's commercial occupancy requirements, including specific fire ratings for windows in proximity to property lines. This is particularly relevant for retail storefronts and office buildings in dense urban areas. Residential windows, by contrast, are primarily governed by energy efficiency standards and basic safety glazing requirements.
For property managers considering window replacements, we recommend engaging a contractor with specific commercial experience. At Arev, our commercial team has extensive experience with the Ontario Building Code requirements, works with certified products for commercial applications, and can provide the documentation your building inspector will require. Contact us to discuss your commercial window or door project.