Walk into most commercial buildings and try to make a phone call. In a surprising number of cases, you'll notice the signal drops. Maybe the call connects but the audio is choppy. Maybe your data crawls. Maybe you can't connect at all in certain areas of the building. This isn't a carrier problem. It's a building problem.
Modern construction materials like low-E glass, metal studs, concrete, and spray foam insulation are excellent at keeping weather out. They're also excellent at blocking cellular signal. The result is that most commercial buildings attenuate 60 to 70 percent of the outdoor signal before it reaches interior spaces.
The in-building wireless market reached $22.58 billion in 2025 and is projected to grow to $39.46 billion by 2030, according to MarketsandMarkets. That's an 11.8% compound annual growth rate, driven by the simple reality that businesses can't function without reliable indoor connectivity.
For some businesses, poor indoor coverage is an annoyance. For others, it's operationally devastating. Hospitals need reliable connectivity for nurse call systems and mobile workstations. Warehouses depend on wireless for inventory management and handheld scanners. Hotels lose guest satisfaction scores when Wi-Fi calling doesn't work. Retail stores can't process mobile payments in dead zones.
The solution is a distributed antenna system, or DAS. It's essentially a network of small antennas installed throughout a building, connected to a central hub that pulls in carrier signal and redistributes it evenly across all floors and areas. The technology has been around for decades in stadiums and airports, but it's increasingly being deployed in mid-size commercial buildings, hospitals, manufacturing facilities, and multi-tenant office spaces.
The U.S. DAS market alone reached $3.61 billion in 2025, according to industry analysis. Globally, the distributed antenna systems market is projected to grow from $11.09 billion in 2025 to $33.69 billion by 2035, per BusinessWire.
What makes DAS deployment complex isn't the technology itself. It's the coordination required. You need RF engineers to design the system. You need low-voltage electricians to run cable. You need coordination with building management for access and shutdowns. You need carrier approval for signal boosting. And you need project management to keep all of those parties aligned across what can be a 6 to 12 week installation timeline.
The indoor 5G market adds another layer. MarketsandMarkets projects it will grow from $17.17 billion in 2025 to $46.66 billion by 2030, a 22.1% CAGR. As enterprises adopt private 5G networks for manufacturing automation, healthcare monitoring, and logistics tracking, the demand for professional installation and commissioning services will only accelerate.
For building owners and tenants, the question isn't whether they need in-building wireless. It's whether they're going to address it proactively or wait until connectivity failures start costing them tenants, patients, or customers.