"Smart building" appears in more and more office brochures, but the term covers everything from heating controlled by an app to a building that manages its own energy use, occupancy and maintenance. This article explains what a smart building is, what technology it contains (building management system, sensors, software), what it delivers for owners and tenants, where the risks lie, and what questions to ask before renting a "smart" office.
What is a smart building?
A smart building is a building in which installations, sensors and software are connected, so that the building itself measures what is happening and automatically responds. Heating that only switches on in rooms where people are present, lighting that dims with daylight, ventilation controlled by CO2 readings, lifts that anticipate the morning rush, and a dashboard that shows the facility manager which floor is too warm before anyone complains.
The distinction from a traditional building does not lie in the presence of technology, since every office has a climate installation, but in three things: the installations measure continuously, the systems talk to each other through a shared platform, and the data is used to control and to learn. A building with separate smart components that do not know about each other is not yet a smart building.
Traditional, smart and intelligent: three levels
- Traditional building: installations run on fixed schedules and manual settings. The facility manager only finds out about problems when someone calls.
- Smart building: installations are linked to a building management system and are controlled by sensor data. The facility manager can see and control remotely.
- Intelligent building: the building predicts based on historical data and external sources (weather, calendars, energy prices) and adapts in advance. Machine learning and a digital copy of the building (digital twin) are part of this.
The European Union is developing a Smart Readiness Indicator (SRI), which indicates how well a building is able to respond to its users, the energy grid and its own performance. The revised Energy Performance of Buildings Directive (EPBD) includes the SRI as an instrument that member states can adopt.
What technology is inside a smart building?
Building management system (BMS)
The building management system (BMS) is the nervous system: it controls heating, cooling, ventilation, lighting and often also solar shading and access. In a smart building the BMS is open (via standard protocols such as BACnet, KNX or Modbus) and connected to other systems, rather than a closed cabinet in the plant room.
Sensors and IoT
The sensors in a smart building measure what the BMS needs in order to control the building:
- Presence and occupancy: infrared, radar or camera sensors per room or per workstation; they count people without identifying them.
- Indoor climate: temperature, humidity, CO2, particulate matter and volatile organic compounds (VOCs).
- Light and sound: daylight levels for lighting, sound levels for acoustics.
- Energy: smart meters per floor or per tenant, electricity per circuit, heat meters.
- Water and installations: leak detection, vibration and temperature of pumps and fans for predictive maintenance.
- Access and security: access cards, mobile keys, cameras, visitor registration.
These sensors communicate wirelessly (for example via LoRaWAN, Zigbee or Wi-Fi) or by cable with the building's network. This is why a smart building starts with good IT infrastructure: cabling, a redundant internet connection and network capacity. Read more about this in IT infrastructure in commercial real estate.
Software for smart buildings
The software is what makes the data usable. Broadly speaking, there are four layers:
- Integration platform (building operating system): links the BMS, sensors, access and energy systems in a single data model, so that suppliers can be interchanged.
- Energy management software: monitors consumption per room and installation, flags anomalies, steers on energy prices and grid capacity, and reports for the energy label and ESG purposes.
- Workplace and user apps: booking desks and meeting rooms, access via your phone, adjusting the climate per room, reporting faults, registering visitors.
- Maintenance and asset management: installations, contracts and inspections in a single system, with alerts from the sensors for predictive maintenance.
A digital twin, a digital copy of the building with live data, brings these layers together in a single view and is used to model scenarios, from a different layout to a heat pump.
Benefits of a smart building
- Lower energy consumption: installations run only where and when needed. In practice, owners report savings of 10 to 30 per cent on energy consumption after smart control of climate and lighting, depending on the starting situation. This helps directly with the energy label obligation and with ESG reporting.
- Comfort and productivity: CO2-driven ventilation and climate control per zone reduce complaints about rooms being "too warm" or "stuffy" — the classic source of office dissatisfaction.
- Insight into occupancy: data shows which spaces are actually used. Many organisations discover that meeting rooms are occupied only 30 per cent of the time and can hand back square metres or reorganise the layout; see how much office space you need per employee.
- Predictable maintenance: a pump that vibrates is replaced before it fails; faults are diagnosed remotely.
- Safety and access: access per person, per room and per time slot, without key management; during an evacuation it is known who is in the building.
- Lettability and value: tenants increasingly ask about it, especially international organisations with ESG targets; for investors, a smart building is easier to finance and certify (BREEAM, WELL).
Drawbacks and risks
- Investment and complexity: sensors, cabling, the platform and integration cost money and require expert management. Without a clear objective (energy, occupancy, maintenance), it becomes an expensive collection of dashboards.
- Vendor lock-in: closed systems make expansion and switching expensive. Ask for open protocols and ownership of the data.
- Cybersecurity: a connected BMS is an attack vector. Network segmentation, updates and access management are not optional extras; the European NIS2 rules also affect building management at larger organisations.
- Privacy: occupancy sensors, cameras and access data fall under the GDPR. Measure anonymously wherever possible (counting rather than recognising), inform employees and record the purposes. See camera surveillance at the office: what's allowed.
- Dependence on connectivity and power: what does the building do if the internet goes down? A good design falls back on local control and has a redundant connection.
What does a smart building offer a tenant?
Not all functions are equally valuable to a tenant. During a viewing, ask specifically:
- Which data will I, as a tenant, actually be able to see: energy consumption on my floor, occupancy, indoor climate?
- Can I set the climate and lighting per zone myself, or only the facility manager?
- How does access work: cards, app, visitors, outside office hours?
- How are service charges calculated: on actual metered consumption per tenant, or pro rata by floor area? See service charges for commercial property.
- What happens in the event of a fault or connection outage, and who can be reached then?
- What data about my employees is processed, by whom, and is there a data processing agreement?
A building that has clear answers to these questions is usually smart in practice too, and not just in the brochure.
Smart buildings in practice
In the Netherlands, the largest applications are found in new-build offices in prime locations (Zuidas, Rotterdam Centrum, Utrecht Centraal), in multi-tenant buildings where desk booking and access are arranged per tenant, and in logistics real estate where energy and dock management deliver direct financial returns. For existing buildings, the first step is usually modest: smart meters, CO2 and occupancy sensors and an energy management package, often paid back within a few years through the energy bill.
Frequently asked questions about smart buildings
What is a smart building?
A building in which installations, sensors and software are connected, so that the building measures what is happening (occupancy, climate, energy, access) and automatically controls installations accordingly.
What sensors are in a smart building?
Presence and occupancy sensors, climate sensors (temperature, humidity, CO2, particulate matter), light sensors, energy meters, leak detection and vibration sensors on installations, and access and security systems.
What software do smart buildings use?
A building management system (BMS) for the installations, an integration platform that links all systems together, energy management software, workplace and access apps for users, and maintenance software for the facility manager.
What are the benefits of a smart building?
Lower energy consumption, a better indoor climate, insight into actual use of spaces, predictable maintenance, better security, and higher lettability and value.
Is a smart building more expensive to rent?
The headline rent is often somewhat higher than for a comparable traditional building, but lower energy and service costs, and fewer square metres needed due to better space use, often compensate for that. Compare based on total occupancy costs.
Looking for an office with modern installations and good connectivity? Browse our office space for rent; for many properties you'll find the energy label and, where available, the IT label.
