A building can be modern, efficient and thoughtfully designed, yet still leave tenants struggling with poor cell service.
A phone may show strong service in the parking lot, only to drop to one or two bars after entering the building. Calls begin to break up, messages fail to send and mobile apps become unreliable in interior rooms. Tenants and visitors find themselves walking toward a window just to get a stronger signal.
Although people often blame their cellular carrier, the building itself may be contributing to the problem. Materials that improve energy efficiency and structural performance can also make it harder for cellular and public safety radio signals to penetrate the building.
The Green Building Paradox
Today’s commercial buildings are designed to conserve energy, maintain comfortable indoor temperatures and meet higher standards for structural performance. Many properties are also constructed or renovated to support sustainability goals, including certification through programs such as LEED.
However, some of the materials that make these improvements possible can also interfere with radio-frequency signals.Cell signals naturally weaken as they pass through a building, and reflective coatings, dense concrete and metal components can make that signal loss worse.
The result is a green building paradox: features that support sustainability and efficiency may unintentionally contribute to unreliable indoor wireless coverage.
Poor Indoor Coverage Is More Than an Inconvenience
Reliable cellular connectivity has become an expected part of the experience in any building, whether it’s a hotel, hospital, or high-rise. When service is inconsistent, the consequences can extend beyond a few dropped calls.
- In a commercial office building, sales teams may miss client calls or struggle to access apps while moving between offices and conference rooms.
- In a healthcare facility, physicians, employees, patients and visitors depend on mobile communication throughout complex interior spaces. Reliable coverage can be particularly challenging across treatment areas, administrative offices, elevators and parking structures.
- Across a college or university campus, students, faculty, staff and visitors expect dependable service in classrooms, residence halls, administrative buildings and gathering spaces. Coverage problems can interfere with communication and create an inconsistent experience as users move between campus facilities.
Some of the materials that weaken commercial cellular signals can also interfere with the radio frequencies used by firefighters, police officers and emergency medical personnel.
Gaps in emergency responder radio coverage can create serious safety concerns and may prevent a property from meeting locally adopted public safety communication requirements. However, commercial cellular coverage and emergency responder radio coverage are not the same system. They operate on different frequencies, serve different purposes and should be assessed separately.
Three Building Materials That May Be Blocking Your Signal
1. Low-E Glass
Low-emissivity (Low-E) glass helps reduce heat transfer through windows. Its thin metallic coating reflects infrared and ultraviolet energy, helping a building stay cooler in the summer and warmer in the winter.
That same metallic coating can also reflect cellular signals. Service that is strong immediately outside the building may weaken considerably after passing through the windows.
If tenants began reporting coverage problems after a window replacement or energy-efficiency renovation, Low-E glass may be one factor. Building managers may also notice a stronger signal near entrances or open doors than they do behind sealed windows.
2. Reinforced Concrete
Concrete is valued for its strength, durability and thermal properties, but its density can make it difficult for cellular signals to pass through.
Steel reinforcement within the concrete can create an additional barrier by reflecting and scattering radio-frequency signals. The combined effect can be especially noticeable in high-rise buildings, parking structures, stairwells and large interior spaces surrounded by multiple concrete walls.
As signals travel deeper into the building or between floors, coverage may become progressively weaker. This can create inconsistent service and recurring dead zones even when outdoor coverage is strong.
3. Steel Framing and Metal Components
Steel framing, metal roofing, ductwork and other metal building components can reflect cellular signals rather than allow them to pass through easily.
When a building contains metal throughout its exterior and interior structure, these materials can create a shielding effect. This is sometimes compared to a Faraday cage, although most commercial buildings do not block cellular signals completely.
Instead, users may experience uneven coverage. Service might be available near one part of the building but unreliable in an office, elevator, conference room or interior corridor only a short distance away.
Is Your Building Causing the Coverage Problem?
Poor indoor cell service can have several causes, but certain patterns suggest that the building itself may be causing issues:
- Cellular service is reliable outside but weakens after entering the building.
- Coverage is stronger near windows or exterior doors.
- Interior rooms, elevators, stairwells or parking areas have recurring dead zones.
- Multiple wireless carriers struggle in the same parts of the property.
- Coverage problems began or became more noticeable after a renovation or window replacement.
- Tenants consistently report dropped calls, delayed messages or unreliable mobile applications.
These warning signs can point to a signal penetration problem, but they do not provide a complete diagnosis. Other factors, including the location of nearby carrier networks and the number of people using the network at once, may also affect performance.
A professional assessment can show how different carrier signals perform throughout the property and determine whether the building is experiencing a coverage problem, a capacity problem or a combination of both.
Curious where your building stands right now? Take this quick assessment to find out your Dead Zone Risk Score
You Don’t Have to Choose Between Efficiency and Connectivity!
The good news is that you don’t have to sacrifice sustainability improvements to provide reliable wireless service. You also don’t have to diagnose complex coverage problems or choose a technical solution on your own.
A trusted partner like Newbridge Wireless evaluates properties to identify cellular coverage gaps, understand carrier performance and determine how the building’s design and materials may be affecting connectivity. When public safety communication is also a concern, we can separately assess emergency responder radio coverage and identify applicable system needs.
Our experts then develop a customized plan around the building’s construction, occupants, carrier requirements and long-term goals. Depending on the property, that plan may include:
- A neutral host distributed antenna system, or DAS, to provide reliable multi-carrier coverage throughout a larger or more complex building
- Small cells to address more targeted coverage or network capacity needs
- ERRC BDA system to evenly distribute public safety communication signals
How Newbridge Wireless Improved Coverage in Modern Campus Buildings
Sacred Heart University faced this exact challenge. Newer construction methods, including Low-E glass and LEED-related building requirements, made it more difficult for outdoor cellular signals to reach students inside campus buildings. Reliable cellular service was particularly important in the dorms, where students no longer had traditional landline phones and Wi-Fi calling could not always provide a dependable backup.
Newbridge Wireless worked with Sacred Heart’s executive director of IT infrastructure to develop and deploy a distributed antenna system that initially focused on its residence halls, with opportunities to expand coverage in future phases. The project was completed in six months through a DAS-as-a-Service model that required no upfront capital investment. As an experienced partner, Newbridge Wireless managed carrier coordination and handled the specialized details, and will continue to support the university with DAS system management going forward.
Newbridge Wireless’ managed service offering provides property owners and IT teams with a clear path to better indoor coverage. Newbridge handles system design, installation, carrier coordination, monitoring and ongoing management, with financing options that eliminate the need for a large upfront capital investment.
The goal is to create an in-building connectivity plan that fits the property, supports its users and allows energy efficiency and reliable coverage to coexist.
Find Out Where Your Building Stands
If tenants, employees or visitors are experiencing poor cell service inside your building, Newbridge Wireless can help identify the cause and develop a solution tailored to your property.