The short version#
Robots are better at watching; people are better at deciding and intervening. A median contracted 24/7 guard post costs about $361,819 a year in our cost model; autonomous coverage of the same post costs a median $89,400. That gap is real, but it is a gap per post replaced, and the right design almost never replaces every post.
Head to head#
| Factor | Guard post | Autonomous sentry | Edge |
|---|---|---|---|
| Annual cost, 24/7 | $290,845–$466,467 (P5–P95) | $66,653–$116,010 | Robot |
| Attention at 03:00 | Declines over a shift | Constant | Robot |
| Night vision | Needs lighting | Thermal + radar | Robot |
| Viewpoint | Ground level | Elevated, movable | Robot |
| Judgment in ambiguous situations | Strong | Escalates to a person | Guard |
| Physical intervention, first aid | Yes | No | Guard |
| Customer service, visitors | Yes | Limited (voice) | Guard |
| Evidence and audit trail | Notebook, bodycam | Every frame and decision logged | Robot |
| Turnover and training | High turnover industry | Software updates | Robot |
What the cost difference depends on#
The sensitivity analysis in our model ranks monitoring cost first: if you hire dedicated operators to watch the robots, you give back a large part of the saving; if alerts flow into an operations center you already staff, you keep it. Guard wage level comes second and the number of sentries needed per post third — a site-survey question. The robot's hourly price ranks below all three.
A split that works#
The pattern we see most often on large sites:
- Static posts at gates and perimeters are replaced by sentries and radar masts.
- One or two mobile officers remain, now dispatched only to verified events.
- Reception and access-control posts that involve people stay staffed.
- The operations center supervises both robots and people from one picture.
That design typically lands at 50–70% lower security spend with better detection, which is the outcome our cost guide walks through.
When guards are the better answer#
Small sites with one or two posts and heavy visitor traffic; sites where the main threat is behavioural (retail, hospitality, healthcare) rather than intrusion; locations where regulation requires a licensed person present; and anywhere the honest answer to “who responds?” is “the guard who is already there.”
Frequently asked questions#
Can security robots replace guards?
They can replace static watch posts; they cannot replace judgment, physical intervention or customer service. Most sites keep fewer, mobile officers.
Are security robots cheaper than guards?
Per 24/7 post replaced, our model shows a median saving of about 75%, with the largest uncertainty coming from monitoring costs.