Presence Detection Sensors: Complete Guide to Commercial Occupancy Detection 2026

Presence detection sensors are electronic devices designed to determine whether one or more human occupants are currently present within a defined space, including the case where the person is sitting motionless, lying down, or sleeping with no visible movement. Modern presence detection sensors use millimeter-wave (mmWave) radar technology at 60 GHz (57–64 GHz) with 7 GHz of bandwidth, achieving a stationary-occupant true positive rate above 99% in controlled testing and above 95% in real-world deployment. The presence detection sensor market has grown rapidly since 2020, driven by the hospitality industry's need for accurate occupancy detection for housekeeping coordination and energy management, the office sector's need for space utilization analytics, and the healthcare sector's need for fall detection and patient monitoring. The "sensors" plural in the keyword phrase reflects the typical procurement scenario, where multiple sensors are deployed across a property to provide building-wide or portfolio-wide occupancy data.

This guide provides a comprehensive overview of presence detection sensors for commercial use, covering the technology, the major application verticals, the deployment patterns, and the selection criteria for choosing the right sensors for a specific commercial deployment.

Presence Detection Sensors: Technology

The technology behind modern presence detection sensors is millimeter-wave (mmWave) radar.

Presence Detection Sensors: mmWave Radar Basics

A mmWave radar presence detection sensor emits a frequency-modulated continuous wave (FMCW) chirp that sweeps across a defined bandwidth (typically 7 GHz at 60 GHz) over a short period. The reflected signal from objects in the detection zone is mixed with a copy of the transmitted chirp, producing a beat signal whose frequency is proportional to the range of the target. By performing a Fast Fourier Transform (FFT) on the beat signal, the sensor can determine the range of every object in the detection zone with a resolution of approximately 2.1 cm.

The sensor then analyzes the phase of the beat signal across successive chirps to determine the velocity of the targets. A stationary person produces a beat signal with a slowly varying phase (due to the micro-motion of breathing), while a stationary chair produces a beat signal with a constant phase. By analyzing the phase variation (the micro-Doppler signature), the presence detection sensor can distinguish a stationary human from a stationary object, enabling true presence detection.

Presence Detection Sensors: Micro-Doppler and Breathing Detection

The micro-Doppler signature of human breathing is the key to detecting stationary occupants. The periodic motion of the chest wall during breathing (amplitude 5–20 mm, frequency 0.2–0.5 Hz) produces a Doppler modulation that is clearly detectable by a 60 GHz mmWave sensor with 7 GHz of bandwidth.

A well-designed presence detection sensor uses signal processing techniques to extract the breathing signature from the radar return, distinguish it from background noise, and use it as a positive indicator of human presence.

Presence Detection Sensors: Performance Metrics

The performance of a presence detection sensor is characterized by several key metrics.

Presence Detection Sensors: Stationary-Occupant True Positive Rate

The stationary-occupant TPR is above 99% in controlled testing and above 95% in real-world deployment.

Presence Detection Sensors: False Positive Rate

The FPR is below 1% over a 24-hour period.

Presence Detection Sensors: Detection Range

The detection range of a 60 GHz presence detection sensor is 6–8 m for stationary occupants and 8–12 m for moving occupants when ceiling-mounted at 2.5–3.0 m.

Presence Detection Sensors: Detection Latency

The detection latency is typically 0.5–3 seconds.

Presence Detection Sensors: Commercial Application Verticals

Presence detection sensors are deployed across multiple commercial application verticals.

Presence Detection Sensors: Hospitality

The hospitality industry is the largest commercial market for presence detection sensors. A typical hotel deployment uses 100–500 sensors across the property, with each sensor installed in a guest room and connected to the building management system via Zigbee. The sensors provide occupancy data for housekeeping coordination, energy management, and guest experience automation.

Presence Detection Sensors: Commercial Real Estate

Office buildings and commercial real estate are the second largest commercial market. A typical office deployment uses 200–1,000 sensors across the building, with each sensor installed in an office, conference room, or common area and connected to the building management system via WiFi or PoE with BACnet.

Presence Detection Sensors: Healthcare

Healthcare facilities are a growing market for presence detection sensors, with applications including fall detection, bed-exit alerting, and patient monitoring. A typical healthcare deployment uses 50–200 sensors across the facility, with each sensor installed in a patient room and connected to the nurse call system and the EHR system.

Presence Detection Sensors: Senior Living and Aging in Place

Senior living facilities and aging-in-place homes use presence detection sensors for fall detection, activity monitoring, and emergency alerting. A typical senior living deployment uses 20–100 sensors per building, with each sensor installed in a resident's room and connected to the monitoring system.

Presence Detection Sensors: Deployment Patterns

The deployment of presence detection sensors follows several patterns, depending on the application and the existing infrastructure.

Presence Detection Sensors: New Construction

In new construction, the presence detection sensors are installed during the construction phase, with the wiring planned during the design phase. The sensors are typically ceiling-mounted, mains-powered (from the room's lighting circuit), and connected via Zigbee to a gateway that integrates with the building management system, the building management system, or the smart home platform.

Presence Detection Sensors: Renovation

In renovation projects, the presence detection sensors are installed as part of the room renovation. The sensors may be mains-powered (if the renovation includes rewiring) or battery-powered (if the renovation does not include rewiring).

Presence Detection Sensors: Retrofit

In retrofit deployments (where the room is not being renovated), the presence detection sensors are installed without rewiring or other construction work. The sensors are typically battery-powered or mains-powered (using an existing outlet), and are mounted on the ceiling with adhesive or screws.

Presence Detection Sensors: Selection Criteria

Selecting the right presence detection sensors for a specific commercial deployment requires evaluating several criteria.

Presence Detection Sensors: Detection Performance

The detection performance is the most important criterion. Key metrics include the stationary-occupant TPR (above 99% in controlled testing, above 95% in real-world deployment), the FPR (below 1% over a 24-hour period), the detection range (6–8 m for stationary occupants, 8–12 m for moving occupants), and the detection latency (below 3 seconds).

Presence Detection Sensors: Form Factor

For most commercial deployments, a ceiling-mounted sensor (70 mm diameter ceiling puck) is the right choice. For premium installations, a recessed mounting option may be preferred.

Presence Detection Sensors: Connectivity

The connectivity should match the existing infrastructure. For hotel deployments, Zigbee is the most common. For office deployments, WiFi or PoE with BACnet is common. For residential deployments, Matter or Zigbee is the most common.

Presence Detection Sensors: Certifications

The presence detection sensors should carry the required certifications for the target market: FCC, CE, RoHS, GDPR, CCPA, and any regional certifications.

Presence Detection Sensors: Recommended Products

The recommended products for commercial presence detection sensor deployments are the ceiling-presence-sensor-zigbee, ceiling-presence-sensor-wifi, and ceiling-presence-sensor-matter, which provide 24GHz wideband mmWave radar detection, multiple connectivity options, full certification, and occupancy-signal output to BMS, BMS, and smart home platforms.

Presence Detection Sensors: Final Recommendation

Presence detection sensors are the foundation of modern commercial building automation, enabling occupancy-based HVAC and lighting control, housekeeping coordination, scheduling platform integration, security monitoring, and space utilization analytics. The 60 GHz mmWave radar is the default technology, providing reliable stationary-occupant detection, an excellent privacy profile, and a compact form factor.

For a procurement team selecting presence detection sensors for a commercial deployment, the right approach is to start with a clear definition of the deployment requirements (number of sensors, integration requirements, compliance requirements), then evaluate the available sensors against those requirements, then select a vendor with a proven track record in the target vertical, and then execute a pilot deployment before committing to a full property or chain-wide deployment. With the right sensors, correctly integrated with the commercial systems, the deployment can deliver significant value through energy savings, operational efficiency, and improved occupant experience.