How Many CCTV Cameras Do I Need? Work It Out in 30 Seconds
By the DC Fire & Security engineering team — installing and maintaining fire and security systems since 2010. Updated July 2026.
Quick answer
Most houses need 2–4 cameras (front elevation, rear garden, side access, driveway); most shops 3–5 (frontage, till, floor, rear door); small commercial units 4–8 (each elevation, entrances, goods areas, choke points). The honest rule: count the ways in and the things worth taking, not the walls. The calculator below does that arithmetic for your property — no email address, no callback ambush.
The 30-second camera calculator
Runs entirely in your browser — nothing is sent anywhere.
Our honest estimate for your property:
cameras
How installers actually count cameras
A camera plan starts from coverage goals, not camera counts. For homes: every realistic approach (front, rear, side passage), the parking, and the doors people actually use. For business premises: every entrance and final exit, the public-facing frontage, the money (tills, safes, stock), and the choke points every person must pass — which is why a well-planned 4-camera system routinely beats a scattergun 8.
What pushes counts up isn't paranoia, it's geometry: L-shaped buildings, detached outbuildings, blind side passages, and high fences that turn one wide view into three narrow ones. What pushes counts down: corner-mounted cameras seeing two elevations at once, fisheye cameras covering a whole room from one ceiling point, and accepting that deterrence at the boundary matters more than filming every square metre.
The mistakes that waste camera budget
- A camera on every window — burglars use doors and blind spots; windows get covered by the room or approach camera behind them
- All cameras at door height — reachable, and facing sunrise/sunset glare; 2.5–3m with a slight down-angle survives both
- Indoor cameras as the main event in a house — the evidence you want is the approach and the face on the way in, not your own hallway after the fact
- Ignoring storage arithmetic — every camera added is recording days lost or disk money spent; the storage guide has the real numbers
- Doubling cameras to fix one bad position — a camera that's badly sited twice is still badly sited; move it
What the answer means in money
As a planning bracket: professionally installed wired systems land around £250–£400 per camera including the recorder share, cabling and setup — so a 4-camera home system sits roughly £1,000–£1,600, and small commercial systems scale similarly per point. The full breakdown by property type, camera spec and the things that move the price is in the CCTV cost guide.
If the calculator says you need more than about 8 cameras, you're into design territory where a site survey earns its keep — coverage overlaps, network layout and storage sizing start interacting, and that's exactly what the free survey is for.
Frequently Asked Questions
How many CCTV cameras do I need for a 3-bed house?
How many cameras do I need for a small shop?
Is one CCTV camera enough?
Do more cameras mean better security?
Should CCTV cameras be visible or hidden?
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Want the count turned into a real design?
The calculator gets you to the right ballpark; a free site survey gets you a camera plan and a fixed price. We design and install CCTV across Luton, Bedfordshire, Hertfordshire and North London — SSAIB certificated, no obligation, and we'll happily tell you if you need fewer cameras than you thought.
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