They may look similar on an elevation, but curtain wall and storefront glazing are not interchangeable systems. The difference starts with how much the façade is expected to handle.
A typical storefront system is intended for a single-story opening. Many manufacturers recommend a height of about 10–12 feet, although the exact limit varies by frame and system. Once the glazing gets taller, wind pressure, water management, and frame deflection become much harder to manage.
That is where curtain wall comes in. It is anchored to the building structure at each floor and is designed to handle wind loads, thermal movement, and water drainage across a much taller façade. It can run continuously from floor to floor rather than stopping at a single opening.
The price reflects that difference.
Recent industry estimates put storefront at roughly 25–$ 60 per square foot installed, while curtain wall can land around 75–$ 150 per square foot, depending on the glass, system, building height, and site conditions.
So why not use storefront everywhere and save the money?
Because the cheaper system only works when the opening falls within its design limits. Stretching storefront beyond those limits can cause deflection, water infiltration, and reduced overall performance. Manufacturer guidance, for example, recommends curtain wall for exterior frames above certain storefront height limits.
For an estimator, the distinction is useful early in the bid. A 10-foot ground-floor retail opening and a five-story glass façade may both appear as “aluminium and glass” on a drawing, but they belong to very different pricing conversations.
The question is not simply which system costs less.
It is whether the storefront glazing or curtain wall system is actually suited to the opening being priced.
