A smart building is a building whose systems, such as heating and cooling, lighting, access control, occupancy sensors, energy meters and room booking, are connected so they share data and can respond to how the space is actually used. Instead of each system running on its own schedule, the building adjusts to real conditions: lights and ventilation scale back in empty areas, cleaning follows actual use, and facilities teams can see which spaces are busy. A building management system (BMS) is usually at the core, with Internet of Things (IoT) sensors and software layered around it.
At a glance
- “Smart” describes connected systems that share data, not a single product or certification.
- Common components: BMS, lighting controls, access control, occupancy sensors, meters and workplace apps.
- The usual goals are lower energy use, better use of space, and easier operations.
- Building systems become part of the IT network, so security and network design are part of the project.
- Many smart building projects are retrofits, not new construction.
What problem it solves
Most commercial buildings run on fixed schedules set years ago. Heating, cooling and lights run in empty rooms, meeting spaces sit unused while employees say there’s nowhere to meet, and facilities teams learn about faults from complaints. Systems from different vendors don’t share data, so the badge system knows who is in the building but the heating system doesn’t.
A smart building connects those systems. Occupancy data can drive heating, cooling and lighting; access events can show which floors are used on which days; meter data can identify waste. For organizations rethinking office space after a shift to hybrid work, the occupancy data alone can inform decisions about how much space to keep.
How it works
Systems. The building’s existing systems form the base: the BMS for heating, ventilation and air conditioning, lighting controls, door access control (on-premises or cloud-managed as access control as a service), video, elevators and energy meters.
Sensors. Added sensors measure occupancy, air quality, temperature, light, noise and water leaks. Many are wireless and battery powered, using Wi-Fi, Bluetooth, low-power wide-area networks or other building protocols.
Network. Devices connect over wired Ethernet, often using Power over Ethernet (PoE) for lighting, cameras and access readers, or over wireless networks. Building systems may have their own network or share the corporate one with segmentation.
Integration platform. Software brings data from each system together, normalizes it and exposes it through dashboards, analytics and rules. Open protocols such as BACnet and published interfaces make this easier; closed, proprietary systems make it harder.
Applications. On top of the data sit uses such as energy optimization, space planning, room booking, workplace apps, predictive maintenance and sustainability reporting.
Our Internet of Things solution page covers how to scope connected-building projects, including the network and security work.
When it matters for buyers
- Moving into or fitting out a new office. It is cheaper to plan network, power and sensor locations before build-out than to retrofit later.
- Energy costs or sustainability reporting. Connected meters and controls are where measurable savings and data come from.
- Reducing or reshaping office space. Occupancy data shows how space is actually used.
- Replacing access control or lighting. Choosing open, networked systems now makes later integration easier.
- Security reviews. Connected building devices fall under operational technology (OT) security and IoT security programs.
Questions to ask vendors
- Which building systems and protocols does your platform integrate with, and which require custom work?
- Who owns the data, and can we export it to our own tools?
- What network, power and cabling do your devices need, and how should they be segmented from our corporate network?
- How do your technicians access the systems remotely, and how is that access controlled and logged?
- What are the ongoing software and support costs after installation?
- What results have you delivered in buildings of similar size and use, and how were they measured?
- What happens to the building systems if your platform or cloud service is unavailable?
How it differs from a building management system
A building management system (BMS) controls a building’s mechanical and electrical equipment, mainly heating, ventilation and air conditioning, and often lighting. A smart building is the wider result of connecting the BMS with other systems, such as access control, occupancy sensors, meters and workplace apps, so data flows between them. A BMS is usually one part of a smart building; a building with a BMS that shares no data with anything else is automated, but not smart in the fuller sense.