Survey: Glass Doors and Windows Pose Significant Security Vulnerabilities on Campus

According to Campus Safety’s latest survey, 43% of participants say their glass doors and windows are the security systems most likely to fail during an unauthorized intrusion.
Published: March 31, 2023

Editor’s Note: With security camera video from Monday’s mass shooting at Covenant School in Nashville, Tennessee, showing that the suspect entered the main building by shooting their way in through two sets of glass doors, we are re-posting our 2022 survey on glass window and door security.

If your campus or organization is considering re-enforcing its glass openings, hire a contractor that specializes in this type of solution. Selecting and installing glass window and door security film and bullet-resistant products is a remarkably complex process. Be careful that the solution selected does not to hinder building evacuation during emergencies.

The security vulnerabilities posed by glass doors and windows appear to be a significant gap for many schools, colleges, and healthcare facilities, according to the 2022 Campus Safety Window Security and Safety Survey.

Our study found that more than a third (35%) of respondents said their glass windows and/or doors are broken at least once a quarter. Additionally, 43% said their glass openings are the perimeter security systems that are most likely to fail if an unauthorized intruder tries to enter their buildings. Despite these concerns, 44% of respondents said they don’t know or aren’t sure what type of glass windows and doors they have in their buildings.

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However, a slight majority of respondents appear to be fairly confident with their perimeter security. More than half of our survey takers are confident (47%) or highly confident (5%) with their current building perimeter security measures. On the flip side, about one in five are either unconfident (16%) or very unconfident (3%).

Most Respondents Believe Their Glass Doors and Windows Won’t Protect Against Security Threats

The protection professionals who participated in the Campus Safety Window Security and Safety Survey said they have very little confidence in the ability of their glass doors and windows to protect people inside their buildings from threats, such as bomb blasts, gunfire, severe weather, and earthquakes. Our survey takers have the lowest confidence in their glass openings’ ability to protect against terrorist attacks involving bombs (1.9 on a five-point scale). It’s important to note, however, that respondents believe the likelihood of glass being broken due to a terrorist bomb blast is quite low (2.5, compared to 3.4 for vandalism/civil unrest or impact with a blunt object).

When asked about their glass openings’ ability to protect people from attacks involving firearms, their confidence is only slightly better at 2.1, with the likelihood of glass breakage being caused by a gun at 3.1. Even when their confidence levels are higher for other threats, such as natural disasters (2.7) and forced entry with a blunt object (2.6), respondents’ confidence levels aren’t anything to write home about when it comes to glass window/door safety and security.


Most respondents (71%) aren’t very confident with the statement, “First responders and/or law enforcement will arrive quickly enough to the scene to prevent an intruder from gaining access through glass.” In fact, more than two in five (43%) either disagreed or strongly disagreed with this statement.   

One mitigating factor to the law enforcement response issue is that more than four out of five survey respondents said they have security personnel in at least a few of their buildings. That said, the survey didn’t ask when or for how long security staff is present. Often, buildings only have security patrols at certain times of the day or evening.

Security Should Partner with Other Stakeholders When Addressing Glass Opening Vulnerabilities

The overall findings from this survey aren’t surprising, considering the age of many of our nation’s K-12, college, and healthcare campuses. For example, according to the National Center for Education Statistics, 28% of U.S. public schools were built before 1950, 45% were built between 1950 and 1969, and 17% were built between 1970 and 1984. This survey should serve as a wake-up call for schools, universities, and hospitals to pay more attention to how they protect their glass windows and doors.

The survey, however, did find some opportunities for security and public safety practitioners. Nearly two in three respondents (63%) said, “Protecting people and property from natural disasters (hurricanes, tornadoes, earthquakes, etc.) is a growing area of concern for building perimeter security and safety for my organization.”

Because many window security solutions also protect against natural disasters, security and public safety practitioners can leverage this information with emergency management stakeholders for greater support and buy-in for their glass window and door security projects.

Campus law enforcement and security executives appear to already understand the importance of energy efficiency, building aesthetics, and occupant comfort. Although these issues aren’t their primary concerns, “building energy efficiency” received a 3.5 rating on a five-point scale, while “building aesthetics” received a 3.6, and “occupant comfort” received a 3.9 from our survey respondents.

Security, emergency management, and public safety executives who select equipment or systems that address more than just security or safety can also tap into other budgets and gain support from other internal and external stakeholders, such as facilities and IT, who are responsible for addressing issues that are not safety or security related.

Unauthorized Intruder Motives Vary Widely

Motives for unauthorized access through glass openings run the gamut. Vandalism/burglary is the most common motive mentioned by survey takers (40%). Disturbingly, however, are the motives that could most likely involve assault or physical violence against other people, including “interpersonal gripe, conflict or revenge” (21%) and “intent to kill” (4%).

The most common “other” response listed by survey takers involves individuals experiencing homelessness trying to gain access for various reasons, such as finding a safe place to sleep, access to water and/or bathroom facilities, etc.


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Campus Safety would like to thank the 166 protection practitioners who participated in this survey. We truly appreciate your input. This survey was sponsored by NGS, a provider of security, energy, and branding retrofits for buildings.

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Strategy & Planning Series
Strategy & Planning Series
Strategy & Planning Series
Strategy & Planning Series