Key point
Define the evidence
A camera for recognising a face at a doorway is not the same as a camera for general yard awareness. Identification, recognition, observation and deterrence each need different angles and image detail.
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CCTV & alarms guide
CCTV Installation | Lock & Key
CCTV works best when it is designed backwards from the evidence needed: what must be identified, what only needs overview coverage, how the site is lit, where cables can run, how long recordings must be kept, and who should be able to view or export footage.
Coverage goals before camera count
Field of view and lighting checks
NVR, DVR, PoE and storage planning
Privacy, signage and access control
Maintenance and remote viewing checks
Key point
Design around the site
A house, shop, office, warehouse, compound, block entrance and multi-tenant site all change the privacy position, recorder location, cable route, user access model and maintenance plan.
Key point
Keep it usable
Footage is only useful when cameras stay clean and aligned, night images are tested, disks are healthy, time is correct, remote access is secured, and exports can be produced quickly.
Installation logic
Design the evidence chain before choosing cameras
A useful CCTV system connects six decisions: the required evidence, the camera view, the lighting, the transmission route, the recorder settings and the person responsible for reviewing footage. If one decision is weak, the rest of the system can look impressive while still failing at the moment it is needed.
01
Purpose
Identify, recognise, observe, detect, deter or verify an alarm.
02
View
Lens width, distance, mounting height, blind spots and privacy masks.
03
Light
Day, night, glare, infrared bounce, floodlights and colour detail.
04
Cable / network
PoE, coax, fibre, wireless bridge, conduit and service access.
05
Recorder
Channels, bitrate, retention, disk health, time accuracy and export.
06
Owner
Named users, permissions, remote access, updates and revocation.
Planning focus
CCTV evidence chain and coverage planning
A camera view has a job
A view for evidence needs enough pixels on the subject at the right distance. A view for awareness can be wider. Mixing those goals without checking distance is a common reason footage disappoints.
The recorder is part of security
Retention, disk health, user permissions, export controls and time accuracy matter as much as the camera image. A system that records the wrong duration or wrong time can fail operationally.
Privacy is built into the angle
Masking, lens choice, mounting height and signage should be decided with the physical layout. It is easier to prevent unnecessary capture than to manage complaints later.
Camera cone check
One wide image rarely proves every detail
Overview, recognition and identification views should be separated on the plan. The same camera can show a whole yard while still being too wide or too high for a useful face, till or number-plate image.
Planning focus
Camera cone comparing overview and identification zones
Planning shortcuts
Four questions expose most weak designs
Can it identify?
The subject fills enough of the frame at the real distance, not just in a close-up demo.
Can it see at night?
The final image is tested with real lighting, headlights, reflections and weather exposure.
Can it keep footage?
Retention days are proven through playback, not assumed from disk size alone.
Can it be managed?
Users, passwords, signage, exports, updates and maintenance have an owner.
Recorder and retention
Storage is designed, not guessed from camera count
Resolution, compression, frame rate, motion level and recording mode decide whether the oldest clip is still available when the system is checked after an incident.
Privacy by layout
Mask what the system does not need
Privacy masking, narrower lenses and changed angles are practical design tools. They reduce unnecessary capture before signage, retention and access controls have to manage it.
Coverage goals and survey inputs
The first design decision is not the number of cameras. It is the job of each view: identify a visitor, prove a vehicle movement, watch a boundary, deter tampering, check a delivery, monitor a stock area, or provide context after an alarm. A survey should capture the evidence goal, likely incident route, mounting options, cable route, lighting conditions, privacy impact and recorder location for every proposed camera.
- Record the reason for each view: identify, recognise, observe, detect, deter, audit, health-and-safety review, or alarm verification.
- Walk the route an intruder, visitor, staff member, delivery driver or vehicle would actually take, including side paths, rear doors and blind corners.
- Photograph mounting points, router location, recorder location, loft or ceiling routes, external wall routes, outbuildings, gates and lighting positions.
- Check what the camera must avoid: neighbouring windows, gardens, staff rest areas, toilets, changing spaces, private desks or unrelated public space.
- Agree retention expectations, export needs, monitor location, app access, alert recipients and who will own administrator credentials.
Camera placement, height and field of view
Placement decides whether footage is useful. Wide-angle views give context but less detail at distance. Narrower lens choices, varifocal cameras and lower approach angles can capture faces, till activity or number plates more reliably. High mounting helps with tamper resistance and broad coverage, but too high an angle can turn people into the tops of heads.
- Use overview cameras for scene context and tighter cameras for faces, tills, gates, loading bays, stock cages or vehicle entry points.
- Avoid relying on one very wide camera to do every job; distance, lens width and pixel density can make a face or plate unusable.
- Aim cameras along movement paths where possible, rather than only across them, so people and vehicles remain in view for longer.
- Check blind spots caused by porch roofs, signs, racking, parked vehicles, shutters, open doors, seasonal foliage and future stock layouts.
- Allow for maintenance access: cameras that cannot be reached safely are harder to clean, adjust, repair or replace.
Lighting, glare and night images
CCTV design should be checked in daylight and after dark. Strong backlight, reflective number plates, glass, wet ground, white walls, infrared bounce, direct floodlights and unlit approaches can all defeat a camera that looked good during installation. Better lighting is sometimes the most valuable CCTV upgrade.
- Test the final view at night before treating the installation as complete, especially for entrances, driveways, yards and loading bays.
- Avoid pointing cameras directly into rising or setting sun, headlights, floodlights, reflective signs, glass doors or close pale walls.
- Use white light, warm lighting, infrared, low-light cameras or separate illuminators according to whether colour detail is needed.
- Keep spiders, dust, rain spots and vegetation away from lenses and infrared LEDs; small contamination can dominate a night image.
- For vehicle views, test real movement and headlights rather than assuming a parked daytime image proves number-plate performance.
Recorder, NVR, DVR and storage capacity
The recorder is sized by channels, camera resolution, compression, frame rate, recording schedule, motion settings and retention days. An NVR usually records IP cameras, commonly through PoE. A DVR usually records analogue or HD-over-coax cameras. Hybrid systems can be useful during upgrades, but the plan should still confirm channel headroom, hard-drive health and export workflow.
- Calculate storage from actual recording settings, not only camera count: 24/7 recording uses far more capacity than event-based recording.
- Leave spare channels and network capacity for future doors, gates, stock rooms, outbuildings, yards or extra overview cameras.
- Use surveillance-rated drives, monitor disk health and confirm that the oldest footage matches the intended retention period.
- Set accurate time, timezone and daylight-saving behaviour so exported clips can be relied on after an incident.
- Confirm how footage will be exported, who can export it, and whether a monitor, mouse, app, browser or VMS will be used.
PoE, cabling and wireless limits
Wired connections are usually the most dependable CCTV route. PoE can carry power and data to IP cameras over one network cable, while coax-based systems can be retained or upgraded in some DVR and hybrid installations. Wireless can solve difficult links, but it still needs power, signal margin, security and realistic expectations.
- Plan cable routes before drilling, including loft access, fire stopping, external conduit, drip loops, outbuildings and service voids.
- Check PoE power budget, cable length, switch location, surge exposure and whether each run needs external-grade cable or containment.
- Label both ends of every cable and name cameras by location rather than default channel numbers.
- Treat Wi-Fi cameras as bandwidth and power-dependent devices, not a no-cable solution; weak signal and busy routers cause dropouts.
- For detached buildings or yards, consider point-to-point wireless bridges, fibre, ducted cable or local recording depending on distance and risk.
Privacy, signage and access control
CCTV should capture no more than is needed for the stated purpose. Domestic systems should be angled and masked to avoid neighbours and shared spaces where possible. Commercial systems need a clearer privacy position: purpose, signage, retention, user access, export process and review of whether CCTV remains justified.
- Use privacy masking, narrower views or repositioning where cameras would otherwise capture unrelated private areas.
- Display appropriate signage where people need to know CCTV is operating, especially in business, shared or public-facing areas.
- Avoid audio recording unless there is a strong, documented reason; it is more intrusive than video-only recording.
- Restrict administrator access, use named users where possible and remove access when staff, contractors or tenants leave.
- Keep retention proportionate and delete footage automatically unless it is needed for an incident, claim or investigation.
Remote viewing and cyber security
Remote viewing should be convenient without leaving the recorder or cameras exposed. Secure setup means changing default passwords, keeping firmware current, limiting administrator accounts, using secure app access, avoiding unnecessary port forwarding and documenting how access can be revoked.
- Change default camera and recorder passwords before internet-connected remote viewing is enabled.
- Keep recorder and camera firmware updated, and record the make, model and support route for future updates.
- Avoid casual port forwarding and open remote management unless there is a clear secure method and someone responsible for maintaining it.
- Set up different access levels for live view, playback, export and administration instead of sharing one master login.
- Check remote access after router changes, broadband changes, app updates and staff changes.
Domestic and commercial planning differences
Domestic CCTV usually focuses on entrances, side access, driveways, garages, gardens and outbuildings. Commercial CCTV may also need tills, staff entrances, warehouses, loading bays, car parks, compounds, plant rooms, reception desks, public counters and managed-building common areas. The larger the site, the more important it is to separate security goals from workplace monitoring and operational convenience.
- Homes should prioritise useful approach views, neighbour privacy, simple app access, secure recorder location and low-maintenance operation.
- Retail sites should check tills, counters, entrances, stock areas, shutters, customer routes, staff-only doors and incident export workflow.
- Warehouses and yards should plan lighting, long-distance views, high mounting, vehicle movement, blind corners and weather exposure.
- Shared buildings should define who owns the system, who can view recordings and how residents, tenants, staff or visitors are informed.
- Commercial sites should align CCTV with alarms, access control, door entry, opening hours, keyholding and incident procedures.
Maintenance, repairs and upgrade decisions
CCTV faults are often caused by cabling, water ingress, power supplies, failed hard drives, dirty lenses, router changes, app permissions, time drift, settings changes or cameras knocked out of alignment. Maintenance should prove that the system is recording the right views, at the right time, for the expected retention period.
- Check playback regularly rather than discovering missing footage only after an incident.
- Clean lenses, trim vegetation, check seals, review lighting changes and confirm night images still work.
- Monitor disk health, recorder temperature, fan noise, error warnings, time accuracy and oldest available footage.
- Investigate offline cameras, cloudy images, intermittent video, failed infrared, missing playback and remote-viewing failures before replacing equipment.
- When upgrading, decide whether to reuse coax, move to PoE IP cameras, add storage, improve lighting or redesign camera positions.
FAQs
CCTV Installation | Lock & Key FAQs
Short answers for separating product research, fitting, survey and urgent callout work.
How many CCTV cameras does a house or business need?
Camera count depends on evidence goals, not property size alone. A small house may need separate views for the front door, side access, rear garden and driveway. A business may need overview cameras plus tighter views for tills, entrances, loading points, stock rooms and vehicle access.
What is the difference between an NVR and a DVR?
An NVR records IP cameras, often over network cabling with PoE power. A DVR records analogue or HD-over-coax cameras. Hybrid recorders can help where an older coax system is being upgraded gradually.
How much CCTV storage is needed?
Storage depends on resolution, compression, frame rate, recording schedule, scene movement and required retention days. Continuous recording at high resolution needs much more storage than event-based recording. The oldest available footage should be checked after installation.
Is wireless CCTV as reliable as wired CCTV?
Wired PoE or coax is usually more dependable for critical cameras. Wireless can work for difficult routes, temporary views or outbuildings, but it still needs power, signal strength, network capacity and secure configuration.
Where should CCTV cameras be placed?
Place cameras where they can capture the required detail at the distance involved: faces at entrances, context over yards, tighter views at gates or tills, and overview coverage for routes. Avoid views dominated by walls, sky, glare, foliage or parked vehicles.
Can CCTV record a neighbour, public pavement or shared area?
Cameras should capture no more than is necessary. If a domestic camera captures beyond the property boundary, privacy expectations become more important and signage, masking, retention and access handling may be needed. Commercial and shared-site systems need clearer privacy management.
Do businesses need CCTV signs?
Yes, public-facing and workplace CCTV normally needs clear notice that recording is taking place, along with a responsible contact or privacy information route. Signage should match the real camera coverage and purpose.
Should CCTV record audio?
Usually no. Audio is more intrusive than video and is harder to justify. It should only be enabled where there is a strong documented reason, suitable notice and a clear access and retention policy.
What should be checked before enabling remote viewing?
Change default passwords, use named users where possible, keep firmware updated, avoid unnecessary port forwarding, confirm router settings, restrict administrator rights and document who can view, play back, export and change settings.
What maintenance does a CCTV system need?
Check playback, clean lenses, confirm night views, monitor disk health, keep time settings correct, review camera alignment, trim vegetation, update firmware and verify that remote access still works after broadband, router or staff changes.
What information helps with a CCTV survey?
Useful survey information includes marked photos or a floor plan, target views, incident concerns, router and recorder locations, power points, cable route limits, lighting photos after dark, retention needs, user access needs and privacy concerns.
When is better lighting more useful than another camera?
Better lighting can be the stronger fix where the existing view is too dark, backlit, reflective or washed out by infrared. A camera cannot reliably capture detail that the scene conditions do not allow it to see.
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