A smart building is a facility that uses networked systems to manage functions such as lighting, HVAC, access control, surveillance, energy use, and automated maintenance. These systems are often called building management systems or operational technology when they control physical equipment.
Smart buildings matter in cyber security because they combine IT and physical operations. If an attacker gains access to the building network, they may be able to unlock doors, disable cameras, disrupt climate controls, or collect sensitive data from monitoring systems. Weak passwords, exposed remote management, poor segmentation, and unpatched controllers are common risk points. Defenders reduce exposure by separating building networks from office IT, using strong authentication, monitoring logs, restricting vendor access, and keeping firmware and controllers updated. In incidents, smart-building systems can become both a target and a signal, because unusual activity may affect safety, continuity, and privacy at the same time.