Designing a CCTV system is far more than picking some cameras and hoping they cover enough. A good design starts from what you actually need to see, works methodically through coverage and camera selection, and then sizes the capacity to record and carry all of it, ending with a documented plan an installer can build to exactly. Skip that method and the result is predictable: blind spots where they matter most, a network that chokes, and storage that fills up long before the footage is needed. Design it properly and you get a system where every camera has a purpose, nothing important is missed, and the recorder still holds the days of video you require. This guide walks through a professional method for designing a CCTV system — defining objectives, surveying the site, designing coverage, sizing capacity, and documenting the result so it can be built, verified, and maintained.
Key Takeaways
- Good CCTV design follows a method: define objectives, survey the site, design coverage, then size capacity.
- Coverage means placing the right cameras to see every critical area with no blind spots and the detail each needs.
- Capacity means sizing the network bandwidth, recorder, and storage to carry and keep all that video.
- The output is a documented design — camera schedule, layout, and specifications — an installer can build to.
- FastEgy designs complete CCTV systems, from survey to specification, across Egypt.
Start With Objectives, Not Cameras
The most common mistake is to start by buying cameras. A professional design starts one step earlier, by defining what the system must actually achieve in each area. Do you need to simply deter, to detect that someone is present, to recognise a known person, or to identify a stranger you have never seen — for example capturing a face clearly enough for evidence at an entrance? These increasing levels of detail are captured in the industry term DORI, for Detect, Observe, Recognise, and Identify, and each one demands more pixels on the target and therefore a different camera and lens. So the design begins with a list, area by area, of the risks and the exact questions each camera must answer: who came through this door, what happened at this till, is anyone in this yard at night. Those objectives drive every decision that follows, and getting them right is what separates a system that helps when something happens from one that merely records a blur.
Survey the Site
With the objectives set, the next step is a site survey, which grounds the design in the reality of the building rather than a wish list. Walking the site — or working carefully from accurate plans where that is not possible — you record the areas that must be covered, the entry and exit points, and the distances involved. You note the lighting through the day and at night, because a spot that is bright at noon may be pitch dark at nine in the evening, and you look for mounting positions and heights, obstructions that would block a view, and the general environment, whether indoor, outdoor, exposed to weather, or dusty. You check what power and network are available and where, and note any existing equipment that might be reused. Photographs and measurements from the survey turn each objective into a concrete, buildable placement, and time spent here prevents the expensive surprises that appear when a design drawn only on paper meets the actual walls.
Design the Coverage
Coverage design is where objectives and survey come together into cameras on a plan. For each area you choose the camera type — a fixed camera for a defined view, a PTZ where one unit must sweep a large space and zoom in, or a multi-sensor for wide panoramic coverage — and then the lens and field of view. This is set by the distance and the detail required: a camera meant to identify a face at a doorway needs a narrower field and far more pixels on target than one giving a general overview of a car park, and the DORI objective for the position dictates which. Mounting height and angle matter just as much, aimed to see faces rather than the tops of heads and to look between and over obstacles so there are no hidden pockets. Adjacent cameras are overlapped so no gap is left where an incident could hide, and the lighting is handled deliberately — wide dynamic range at bright doorways, and low-light or full-colour night technology where it gets dark. The discipline throughout is balance: enough cameras to meet every objective without blind spots, but not a wasteful scatter of cameras that duplicate each other.
Size the Capacity: Bandwidth, Storage, and Power
Coverage decides the cameras; capacity decides whether the system can actually record and carry what they produce, and it is where amateur designs quietly fail. Bandwidth comes first: the combined data from every camera stream, set by resolution, frame rate, and codec, must fit within the network and the recorder's throughput, and modern H.265+ compression cuts that load dramatically. Storage is a simple calculation with large consequences — the number of cameras, their bitrate, and the days you must keep footage give the capacity needed, which H.265+ and smart, event-based recording reduce substantially. The recorder is then chosen to match: enough channels, throughput, and drive bays, with RAID redundancy where losing footage is not an option. Around this sits the supporting infrastructure — structured Cat6 cabling, PoE switches sized for the load, network segmentation for security, and reliable power backed by a UPS, which in Egypt is essential so the system keeps recording through the power cuts.
Document the Design
The final step turns all the thinking into something that can be built and checked. A proper design is documented as a camera schedule that lists, for every camera, its location, type, lens, resolution, and the objective it serves; a layout drawing showing each position and the coverage it provides; the network and power design; and the bandwidth and storage calculations behind the chosen recorder. Together these form a specification an installer can build to precisely and a client can sign off with confidence. Documentation is not bureaucracy — it is what makes a system repeatable, verifiable against the plan once installed, and far easier to maintain and expand later, because the next person knows exactly what is where and why. A design carried only in someone's head cannot be checked or handed over. This is the level at which FastEgy works, delivering a complete, documented CCTV design from the first survey to the final specification for projects across Egypt.
Frequently Asked Questions
How do I start designing a CCTV system?
Start with objectives, not cameras. Decide what each area needs the system to do — deter, detect, recognise, or identify — because that determines the detail and therefore the camera and lens you need. Then survey the site and design coverage around those goals.
How do I know how many cameras I need?
It comes from coverage design: mapping every area you must see, the detail each one requires, and placing cameras with enough overlap to leave no blind spots. It is driven by your objectives and the site itself, not by a fixed number of cameras per area.
What is DORI in CCTV design?
DORI stands for Detect, Observe, Recognise, and Identify — increasing levels of detail measured in pixels on target. An identification shot of a face at a door needs far more pixels than a general overview, and the required level sets the camera and lens for each position.
How do I size storage and bandwidth?
Storage comes from the number of cameras, their bitrate, and how many days you must keep footage, and H.265+ compression with smart recording cuts it substantially. Bandwidth is the total of all camera streams, which must fit the network and the recorder's throughput.
Why is a documented design important?
A documented design — camera schedule, layout, and specifications — means the system is built correctly, can be verified against the plan, and is far easier to maintain and expand later. It turns a good idea into a system an installer can reliably build and a client can sign off.
Related Guides
- How Many Cameras Do You Need
- 10 Rules for Positioning Cameras
- Bitrate and Bandwidth Planning
- CCTV Storage Optimization
Have FastEgy Design Your CCTV System
FastEgy designs complete CCTV systems across Egypt, from the first site survey to a fully documented specification — objectives defined per area, coverage designed with no blind spots, capacity sized so the system records and keeps every day you need, and infrastructure and power planned for reliability. You get a proper design an installer builds to, not guesswork. Call 17586 or talk to our team about designing your system the right way.