How many security cameras do I need at home?

The short answer

The right method: count entry points, not square metres

The most common mistake is thinking in terms of cameras per room or per square metre. That is not how it works. What a burglar looks for is a way in without being seen. Your camera system should close off those routes — not monitor the inside of your living room.

The question you need to ask yourself is: where could someone enter my property without me noticing? Each answer to that question is a point where you need a camera.

Entry points that always need covering

These are the priority spots in any property. If any of these are without a camera, you have a blind spot:

• Front door: always, without exception. An outdoor camera with a wide angle (minimum 100–120°) capturing the entrance from the street or communal landing.
• Back door or service entrance: secondary access points are the most commonly used in break-ins precisely because people tend to overlook them.
• Garage: if the garage connects to the interior of the property, the internal access door is just as critical as the front door. An indoor camera aimed at the door leading into the house.
• Garden and perimeter: a single wide-angle camera from an elevated corner can cover the whole garden. You do not need one camera per tree.
• Accessible patio or terrace: if someone could climb in from the street or from a neighbouring property, it is an entry point.
• Building entrance or letterbox area: in apartment blocks, a camera at the main entrance covers the shared access and deters tampering with letterboxes or parcel deliveries.

How many cameras by property type

Flat above ground floor (no direct external access)

The only real entry points are the flat's front door and, if it exists, a terrace or balcony that is accessible from the ground or via an exterior staircase.

• 1 indoor camera pointing at the entrance door from inside (no need for IP67 rating or weatherproofing).
• 1 terrace camera if external access is physically possible.
• Typical total: 1–2 cameras.

Ground-floor flat or flat with a patio

Ground floor adds vulnerability: windows accessible from the street, a back patio, a storage room with external access.

• 1 camera at the entrance door.
• 1 camera covering the patio or rear area.
• 1 additional camera if there are windows accessible from the street or side.
• Typical total: 2–3 cameras.

Townhouse or semi-detached in a development

The most common property type on the Costa del Sol. It has several entry points: front door from the street or private road, back door to the patio or garden, garage, and sometimes a side or service entrance.

• 1 camera at the front entrance (door or access gate).
• 1 camera covering the back door or garden access.
• 1 camera in the garage (indoors, aimed at the door into the house).
• 1 wide-angle camera for the garden or pool area if the perimeter is significant.
• Typical total: 3–5 cameras.

Detached villa or country house

More perimeter, more entry points — often with a vehicle entrance gate, a separate pedestrian gate, side façades, and a pool area separate from the main garden.

• 1–2 cameras at the entrance (one for vehicles, one for pedestrians if they are separate).
• 1–2 cameras covering the side façades (the passage between your house and the boundary wall is the classic blind spot).
• 1 camera at the garage-to-house access door.
• 1–2 cameras for the garden or pool depending on the size of the perimeter.
• 1 indoor camera in the hallway or entrance area if the owner wants an extra layer of coverage.
• Typical total: 6–10 cameras, sometimes more for large rural properties.

Field of view and overlap: how much does one camera cover?

A standard outdoor camera with a wide-angle lens covers between 90° and 130° of horizontal field of view. That is enough to cover a door or an access point well, but not an entire façade or a whole garden from a single position.

Some practical considerations:

• Recommended installation height: between 2.5 and 3 metres. Above that height, facial detail is lost; below it, the camera can easily be interfered with.
• 10–15% overlap: in critical areas it is worth having two cameras that can each see the other. If one is tampered with or blinded by backlighting, the second records it.
• Backlighting and direct sunlight: do not install a camera facing the morning or afternoon sun. Backlighting saturates the sensor and the image becomes useless.
• Side passages: the narrow gap between your house and your neighbour's boundary wall is the most common blind spot in townhouses. A corner-mounted camera at height with a 100° angle covers that passage from end to end.

How many channels do I need on the NVR?

The NVR recorder manages as many cameras simultaneously as it has channels. The most common models for residential use have 4, 8 or 16 channels.

The practical rule is: choose an NVR with more channels than you currently need. If you have 4 cameras, buy an 8-channel NVR. That way you can expand the system by adding cameras in the future without replacing the recorder.

Also check that the NVR has enough internal bandwidth to record all cameras at their maximum resolution simultaneously. A cheap 8-channel NVR may not be able to handle 8 cameras in 4K at the same time.

Indoor vs outdoor: do I need cameras inside the house?

For most homes, the external perimeter is sufficient and more of a deterrent. Indoor cameras make sense in specific situations:

• A camera in the internal hallway, aimed at the front door, as a second line of defence if the outdoor camera fails.
• A camera in the area where you keep valuables, if it is a high-risk zone.
• Holiday homes or properties left unoccupied for periods, where you want to know if someone enters without triggering the outdoor alarm.

In Spain, recording domestic staff on the premises is regulated: if you have household employees, consult a legal expert before installing cameras in work or rest areas.

Common mistakes to avoid

• Buying the camera kit before mapping your entry points. First identify how many entry points you have; then decide how many cameras and which model.
• Covering only the front of the property and forgetting the rear. The back door and the patio are the entry points most commonly used in forced break-ins.
• Installing too many cameras without coordinating the angles. Five badly placed cameras can have more blind spots than three well-positioned ones.
• Ignoring backlighting. A camera facing the afternoon sun produces unusable images at the very moment when there is most light.
• Not leaving spare channels on the NVR. Security systems always get expanded. Buy with headroom.
• WiFi cameras outdoors without an IP rating. On the Costa del Sol, salt air, intense sun and levante rain can destroy a camera without at least an IP66 rating within months.

What if my budget is limited?

If you cannot cover all your entry points at once, prioritise in this order:

1. Front entrance door.
2. Back door or patio/garden access.
3. Garage (if it connects to the house).
4. Side perimeter or pool area in a second phase.

Three cameras on the critical entry points protect more than five scattered without a plan. The goal is to close off the entry routes, not to increase the number of recordings.

You might also find these useful

• Our security and installation services in Málaga
• Our installation service on the Costa del Sol