You’ll notice a difference in the windows when you stroll through any newly finished mixed-use development in a mid-sized American city. Yes, they appear cleaner, but there’s more to them—a subtle etching, a particular tint, or a nearly undetectable layering that wasn’t common even five years ago. Most people are unaware of it. Developers take note. Their project accountants are undoubtedly aware.
The built environment has always been influenced by urban planning regulations in ways that the general public hardly ever notices. However, the movement to require safe glazing standards in new construction is one of those changes that begins subtly—buried in building ordinance appendices, discussed in planning committee rooms with half-empty chairs—and then all of a sudden becomes widespread.
In an increasing number of building types, municipalities from the Pacific Northwest to the mid-Atlantic are revising their codes to mandate impact-resistant, bird-safe, or thermally rated glazing. The implications of that are only now being considered by the real estate sector.
It is easy to understand the reasoning behind the mandates. Every year, a sizable portion of building-related incidents involve glass-related injuries in both residential and commercial settings. The impact that reflective and transparent glass has on migratory bird populations has been documented by ornithologists for decades; estimates of the number of bird deaths in North America each year are in the hundreds of millions. Large, uncoated glass facades contribute to urban heat island effects, which have prompted climate-conscious planners to consider glazing as low-hanging fruit in sustainability overhauls. In other words, regulations pertaining to safe glass are not emerging overnight. They’re coming simultaneously from multiple directions.
The speed and unevenness of local jurisdictions’ current code revisions set them apart from previous ones. It’s similar to witnessing strangers sewing together a patchwork quilt. Since 2011, San Francisco has expanded its bird-safe glazing regulations for new construction. In 2019, New York City followed suit with Local Law 15, which covered buildings owned by the city before broadening the requirements. Impact-safety regulations were implemented in a number of Chicago suburbs well ahead of state-level directives. As a result, developers operating in various markets find it extremely challenging to navigate the fragmented compliance landscape.
The real estate sector frequently delves into the inevitable cost issue. Laminated glass, fritted glass with ceramic frit patterns, and UV-reflective coatings are examples of safe glazing products that are significantly more expensive per square foot than regular commercial glass. Project managers on mid-rise residential projects have reported cost increases of eight to fifteen percent on glazing budgets after upgraded specifications are taken into account, though industry estimates vary. That’s not a rounding error on a building with a lot of curtain wall coverage. This line item influences financing assumptions, shifts pro formas, and occasionally makes marginal projects unfeasible.
However, it’s important to be wary of the loudest complaints. In the past, the construction industry has adapted to code changes that at first appeared prohibitive, such as mandates for energy efficiency, seismic retrofitting, and fire suppression systems. There is a plausible argument that as product supply increases, manufacturer competition heats up, and compliance becomes the norm rather than the exception, safe glass regulations will take a similar course.
However, there is real tension due to the timing. Due to labor shortages and unresolved supply chain disruptions, construction costs have already increased over the past few years. It is not neutral to impose new material specifications on a market that is already under strain. Smaller developers are most affected, especially those involved in community-scale projects or affordable housing. If implementation isn’t accompanied by significant incentives or phased timelines, there is a genuine risk that well-meaning codes will have unexpected consequences.
It appears obvious that these mandates will remain in place. Fundamentally, urban planning has always involved balancing the long-term needs of cities with current market demands. In many ways, the movement to require safe glass is a continuation of that long-standing discussion, which dates back to the nineteenth-century public health regulations that required builders to consider space, sunlight, and sanitation even when doing so seemed inconvenient. Cities that take a cautious approach, with well-defined deadlines and uniform enforcement, are likely to be ahead of the general regulatory landscape. Developers who discover that early on are typically the ones who succeed.
