Security Robots vs Inspection Robots: What Each One Actually Does in an Office Building

• Security robots watch for people, vehicles and events, deter by being seen, and hand incidents to a human operator.
• Inspection robots measure equipment condition with thermal, acoustic, ultrasonic, vibration, gas and visual sensors, and turn findings into maintenance records and work orders.
• Security robots are sold mostly by subscription. Knightscope describes its robot subscriptions as about $1 to $11 per hour, and Cobalt has described a full package at $126,000 per robot per year.
• They overlap on after hours rounds, vacant floors, open doors and obvious water. They do not overlap on deterrence, incident response, equipment condition or compliance records.
• Choose by the problem you need solved and the team that will act on the output: the security desk or the engineering team.

A security robot is a mobile camera platform with a job description borrowed from a patrol officer. It follows a route, watches for anything unusual and gets a human involved fast.

• Outdoor patrol: robots such as Knightscope's K5 patrol garages, perimeters and plazas with 360 degree video and license plate recognition. At U.S. Bancorp Tower in Portland, a K5 patrols the perimeter of the parking structure to watch for unwanted vehicles (Unico Properties).
• Indoor patrol: robots such as Cobalt's work inside office floors. They can ask people to badge in at the robot, flag improperly opened doors and spot trip hazards, with trained operators available around the clock through a remote command center (Orange County Business Journal, 2023).
• What it records: video, patrol logs, people and vehicle detections, and incident reports for the security team.

The value is deterrence, coverage and faster response. The output belongs to the security desk.

An inspection robot is a mobile sensor platform with a job description borrowed from a building engineer's round. It visits the same equipment from the same position every time and measures how it is doing.

• Thermal: hot connections in panels and switchgear, warm motor bearings, cold block heaters and cool, wet patches in ceilings. See how thermal imaging finds a failing connection.
• Acoustic and ultrasonic: abnormal noise, air and steam leaks and early electrical discharge. See ultrasonic screening.
• Vibration: failing fan and pump bearings before they seize.
• Gas and air quality: refrigerant, battery off gassing and combustion byproducts.
• Visual: gauge readings, valve positions, water on floors, blocked clearances and propped fire doors.

What it records: readings tied to a specific asset and time, trends over weeks and months, and findings that become work orders. The output belongs to the engineering team, and it feeds the maintenance program described in our preventive maintenance guide for commercial office buildings.

Security robots

• Knightscope: describes its autonomous security robot subscriptions as about $1 to $11 per hour (Knightscope, September 2025). The company reported 2025 revenue of $11.3 million, with service revenue about 70 percent of the total (Knightscope, March 2026).
• Cobalt: its COO described a complete package, including hardware and maintenance, at $126,000 per robot per year in 2023 (Orange County Business Journal).

The guard comparison

Security robots are usually priced against guards. The Bureau of Labor Statistics puts the national median wage for security guards at $38,020 a year in May 2025 (BLS), and the Texas median at $17.30 an hour (O*NET, 2025). Billed rates from security firms run higher, and Knightscope's own estimate is $25 to $65 per hour, or $220,000 to $570,000 a year for 24/7 coverage.

The real comparison is coverage, not headcount. Robots rarely replace a guard who must respond, but they can cover hours and areas a guard post cannot.

Inspection robots

Inspection robots are sold as hardware plus software, or as an inspection service that includes the robot, the analytics and the reporting. The comparison is not guards but engineering hours and avoided losses: the rounds the team no longer walks, the failures caught early and the claims that never happen.

Where they overlap

• After hours rounds: both cover nights and weekends when buildings are emptiest.
• Vacant floors: both can confirm a floor was visited, which matters for insurance on empty space. See our guide to vacant building insurance.
• Doors: both can notice a door that should be closed.
• Obvious water and hazards: both can see a large puddle or an object in a corridor.

Where they do not

• Only a security robot: deterrence by presence, people and vehicle detection, license plates, two way communication with intruders and incident escalation to a security operator.
• Only an inspection robot: thermal scans of electrical equipment, bearing vibration, ultrasonic leak detection, gas sensing, gauge and valve reading, asset by asset trends and work orders to the engineering team.
• Different routes: security robots patrol public and perimeter spaces; inspection robots spend their time in mechanical rooms, electrical rooms, risers and plant spaces.

Start from the problem and the team that will act on the robot's output.

• Choose a security robot if the pain is trespassing, vehicle break ins, after hours incidents or a guard post you cannot staff, and the security desk is ready to receive alerts.
• Choose an inspection robot if the pain is equipment failures, water losses, missed rounds, thin maintenance records or insurance and compliance evidence, and the engineering team is ready to receive work orders.
• Consider both if you run a large or high profile building where both problems are real. Give each robot its own job and route, and agree how findings that cross over, such as a propped fire door, get shared.

Before signing, ask the questions in our hub guide to robots in commercial buildings: safety, privacy, data ownership, building fit and who acts on findings.

What does a security robot do in an office building?

It patrols a set route, records video, detects people and vehicles, flags open doors and hazards, and alerts a human security operator who decides how to respond.

How much does a security robot cost?

Most are subscriptions. Knightscope describes its robot subscriptions as about $1 to $11 per hour, and Cobalt has described a full package at $126,000 per robot per year.

Can a security robot replace a security guard?

Usually not entirely. Robots extend coverage and deterrence, but a person still has to respond to incidents.

What does an inspection robot measure?

Equipment condition: thermal images, sound, ultrasound, vibration, gas and air quality, gauge readings, valve positions, leaks and clearances, each tied to an asset and a time.

Can one robot do security and inspection?

They overlap on rounds, doors and obvious water, but the sensors, routes and outputs are different. Most buildings get better results giving each job to the robot built for it.

FacilityOps AI (RoboSkill Inc.) is an autonomous inspection platform. A FacilityOps inspection robot walks the route through mechanical rooms, electrical rooms, risers, pump rooms and plant spaces on schedule, and measures equipment condition on every pass.

• Condition, not just presence: thermal, acoustic, ultrasonic, vibration, gas and visual readings on the same assets from the same positions every round.
• Findings to work orders: every finding is stamped with the time and location, tied to the asset and sent to the engineer who owns it, and the next pass confirms the fix. A security patrol robot is not built to do this.
• Between passes: sensor hubs at known trouble spots send the robot to look when a reading changes.
• Crossover findings: a propped fire door, an open riser closet or water near an entrance can be shared with the security desk, so the two programs reinforce each other.

The robot runs fully autonomously, and technicians can take manual control at any time. The platform is hardware agnostic, so drones, other robots, including other vendors' platforms, or a technician's own camera can feed the same record.

The security robot watches the building. The inspection robot checks that the building works.

FacilityOps documents equipment conditions on its route. It is not a security service and does not replace guards, licensed testing or compliance certification.

• Robots in Commercial Buildings: Security, Cleaning, Inspection and Humanoid Robots Compared
• Monitoring, Inspection and Robotic Action: What Is the Difference?
• Vacant Building Insurance: The 60 Day Vacancy Clause and How to Inspect Empty Floors