How Many Cameras Does a Factory Floor Actually Need?
Short answer: there is no single number — it's driven by your floor's zones and sightlines, not its square footage. Most small-to-mid production floors are covered well by roughly one camera per distinct work zone plus one per entry/exit and one per aisle intersection. A 1,500 m² workshop with 6–8 machine cells, two doors and a materials aisle typically lands around 8–12 cameras. But counting by area alone is how projects end up with blind spots or wasted hardware.
Here's how to size it properly.
Count by zones, not by square meters
A camera doesn't cover "an area" — it covers a sightline. A single 2.8 mm lens sees a wide, shallow cone; a machine, a rack, or a pillar in front of it creates a shadow the camera never sees into. So the right unit of planning is the zone: a place where something you care about happens.
Walk your floor and mark a camera for each of these:
- Every distinct work zone — each machine cell, assembly bench, or process station where you want to see activity, output, or safety.
- Every entry and exit — doors, dock gates, gaps in fencing. These are your accountability points.
- Every aisle intersection and blind corner — where people and forklifts cross.
- Hazard zones — presses, moving equipment, chemical or high-temperature areas, forklift lanes.
- High-value or theft-prone spots — tool cribs, finished-goods staging, materials store.
Add them up. That count — not the floor's area — is your real starting number.
Then adjust for reality
- Obstructions cost cameras. Tall racking, mezzanines, and large machines block sightlines. A cluttered floor needs more cameras than an open one of the same size.
- Mounting changes coverage. Ceiling-mounted turret cameras give wide top-down coverage of a zone; wall-mounted bullet cameras give a longer, narrower view down an aisle. Mixing both usually beats one type everywhere.
- Overlap a little, on purpose. A small overlap between neighbouring cameras removes the seams where an event can slip between two views. Aim for light overlap at zone edges, not full redundancy.
- Don't over-cover low-value space. Empty walkways and storage nobody enters don't each need a camera. Coverage should follow where value and risk are, not fill every wall evenly.
What we saw on a real floor
In one of our pilots we ran three 2 MP cameras over a working production floor for two weeks. Two things stood out that no area-based formula would have predicted:
- Coverage was decided by the floor's structure — a tall machine and a structural pillar — not by meters. Three cameras were enough for the open half of the floor, but that single column created a blind spot that would have hidden a whole work zone — caught only by walking the space, not by drawing a grid on a plan.
- A daytime power cut took the cameras down while an on-battery device kept running. Over 14 days we logged exactly one outage — daytime, no night events — but it exposed that the cameras and switch had no battery backup. The lesson for any camera plan: a small UPS on the PoE switch matters as much as the camera count.
The takeaway: the number of cameras is the easy part. Where they go — and what keeps them running — is what actually determines whether you see what you need to.
The fast way to get the number right
Counting zones by hand works, but it's slow and easy to get wrong on a busy floor. This is exactly the problem Mama is built for: you record a short walkthrough of the floor on a phone, and Mama reads the space — zones, sightlines, obstructions, hazards — and returns a camera plan (how many, where, ceiling vs wall) plus a coverage map, without a site survey. You get the number and the layout in a day, not after an engineer's visit.
FAQ
How many CCTV cameras do I need for a small factory? Count one camera per distinct work zone, plus one per entry/exit and one per aisle intersection or blind corner, then adjust for obstructions. A small workshop often needs 6–12; the exact number depends on layout, not floor area.
Is it better to have more cameras or higher-resolution cameras? Placement beats resolution. A well-placed 2 MP camera on the right sightline sees more that matters than a 4K camera pointed at a blind wall. Get coverage right first, then raise resolution where you need to read detail (labels, faces, gauges).
Ceiling or wall mounting for factory cameras? Ceiling-mounted turret cameras suit wide top-down coverage of a work zone; wall-mounted bullet cameras suit long, narrow views down an aisle. Most floors are covered best by a mix of both.
Do I need a camera in every area of the plant? No. Cover where value and risk are — work zones, exits, hazards, high-value storage. Empty walkways and unused space don't each need a camera.