Doberman

CCTV maintenance and servicingthe complete guide

Cameras that aren’t looked after quietly let you down: dying drives, failed seals, unpatched firmware. Here’s how often to service a system, what a proper visit covers, and what you can safely check yourself.

The quick answer

Most home and small-business CCTV should be serviced at least once a year; monitored systems built to BS 8418 want a service at least twice a year. A proper visit checks far more than whether the picture’s on: image quality, camera aim, weatherproof seals, night-time lighting, recorder and drive health, connections, and playback of recorded footage, finishing with a written service report. The big silent killers in Leicester’s damp climate are corroded outdoor connections, failed seals letting condensation in, dying hard drives, and out-of-date firmware that leaves cameras open to being hacked.

Service intervals (scan this first)

Here’s how often each type of system wants looking at, what it especially needs, and who should be doing the work. If you’re trying to work out where your setup sits, start here, then read the detail below.

Typical home system (wired PoE, local recorder)

How often to service
At least once a year
What it especially needs
Lens and IR glass cleaning, seal and connector checks, drive health, firmware updates
Who should do it
Mostly engineer; some safe DIY checks between visits

Small-business system (shop, unit, yard)

How often to service
At least once a year, more if insurance asks
What it especially needs
Everything above plus footage retention and signage compliance
Who should do it
Engineer, with a maintenance contract

Monitored system (alarm-confirmed, built to BS 8418)

How often to service
At least twice a year (every 6 months)
What it especially needs
Set/unset testing, detector alignment, alarm-image receipt at the monitoring centre, battery backup
Who should do it
Accredited engineer only

System linked to a police response (URN)

How often to service
At least twice a year, by an accredited firm
What it especially needs
All monitored checks, kept to the standard the URN depends on
Who should do it
NSI- or SSAIB-accredited installer only

Any outdoor camera in a wet/exposed spot

How often to service
Bring the visit forward if you see fog inside the glass
What it especially needs
Re-seal or repair, never just wipe condensation off
Who should do it
Engineer if the seal has failed

By the Doberman install team

CCTV system designers & installers, Leicester

Last reviewed June 2026

How often should CCTV actually be serviced?

For a typical home or small-business system, once a year is the sensible baseline. That one annual visit is what catches dying drives, failed seals and out-of-date firmware before any of them cost you footage. It’s the difference between a problem you fix on a planned visit and one you discover the morning you actually need the recording.

Monitored systems built to BS 8418 want preventive maintenance at least twice a year, every six months. That twice-yearly cadence is the baseline for detector-activated, remotely monitored kit, not some URN-only extra. And if your system is linked to a police response URN, an accredited firm has to keep it to standard, which in practice means that same twice-yearly schedule done by an NSI- or SSAIB-accredited installer.

Don’t wait for the calendar if something looks off. Bring a visit forward early if you spot condensation inside a camera, a camera dropping offline, grainy or dark images, or gaps in the recording. BS 8418 also makes annual or better servicing a condition of the install, so for monitored kit this isn’t optional housekeeping, it’s part of staying compliant. If you’re due a visit, our CCTV maintenance service in Leicester runs to exactly this schedule.

Not sure when your system was last properly checked?

Tell us what you’ve got and we’ll arrange a free site survey to look over the cameras, the recorder and the seals before anything fails.

What a real service visit covers (it’s not just “is the picture on?”)

A proper service starts with image quality on every camera, but it doesn’t end there. The engineer checks each camera is still aimed where it should be and that nothing’s grown or been built up in front of it. A hedge that’s had a good summer or a new delivery bay can quietly turn a perfectly good camera into a view of a wall.

Then come the parts that matter most in our climate: the weatherproof housing and seal integrity, and the state of every outdoor connection, because that’s exactly where Leicester’s wet weather does its damage. The engineer also checks supplementary and infrared (IR) lighting, so your night images stay usable rather than just confirming the daytime picture looks fine.

Inside the recorder, it’s about hard-drive health, free disk space, and actually playing back recorded footage to confirm it’s there and watchable. On monitored systems there’s more again: set/unset procedures, detector alignment, confirmation that alarm images are reaching the monitoring centre, and a check of the battery backup (UPS). Whatever the system, you should get a written service report at the end listing what was checked, what was fixed and anything that needs watching. If you just want a one-off once-over rather than a full contract, a CCTV system health check covers the same ground.

Recorder storage: why the hard drive is the part that quietly dies

The single component most likely to let you down is the hard drive, and it’s nearly always because the wrong type went in. A surveillance-rated drive is built to read and write 24/7. A desktop drive is built for roughly an office day and simply isn’t tuned for the constant streaming-write pattern of CCTV. Drop a desktop drive into a recorder and it commonly starts throwing bad sectors within about 6 to 18 months. A surveillance-grade drive typically lasts around 4 to 6 years under that same constant use.

The workload ratings tell the same story. A desktop drive is rated for roughly 55 TB a year, a standard surveillance drive around 180 TB a year, with premium “Pro” surveillance drives rated far higher again. For a system writing around the clock, that gap is the whole ballgame.

Warning signs a drive is on the way out: cameras recording but with gaps, the recorder rebooting itself, clicking or grinding noises, or playback that stutters and freezes.

Planned drive replacement is cheaper than discovering a dead drive on the morning you actually need the footage, which is precisely when people tend to find out. It’s the first thing we look at on any visit, and it’s why drive health gets checked at every service rather than left to chance.

Retention and overwrite: why your system deletes old footage on purpose

Almost every recorder uses loop recording: once the disk is full, it overwrites the oldest footage first. That’s normal, designed behaviour, not corruption or a fault, so there’s no need to panic when old clips start disappearing. How many days you keep is really a storage-sizing decision. More cameras, higher resolution and 24/7 recording rather than motion-only all eat days off your retention.

Around 31 days is the common review window for insurers and police, and a sensible target for most homes and small shops. If you’re only getting a few days of footage, you’ve either outgrown your drive or it’s failing, and both are worth flagging at a service. If you want the full detail on why systems overwrite, we cover it in how long CCTV footage lasts before it overwrites.

A couple of options buy you resilience. Edge storage, a microSD card inside the camera, gives you a backup copy if the recorder fails or is stolen, though cards are small and wear out so they need periodic replacement. On larger sites you can add drive redundancy (RAID) so a single failed drive doesn’t take the whole recording down with it.

Only getting a few days of footage?

That usually means an undersized or failing drive. We’ll check it on a survey and tell you what it’ll take to hit a sensible retention window.

Firmware and security: an out-of-date camera is a hackable camera

Firmware is the camera’s own software, and it gets updated to patch known security flaws. Skip the updates and an attacker can potentially view your live feed, disable cameras or wipe footage. The NCSC’s advice for home camera owners is blunt: change any default password to a strong, unique one (it suggests three random words), keep the camera updated, and switch on automatic updates if the option’s there.

Lock down the network too. If you don’t need to view the cameras over the internet, turn remote viewing off, and on the router disable UPnP and port forwarding unless you genuinely need them. There’s more on the real-world risk in our explainer on whether someone can hack into your CCTV cameras.

Here’s the catch: cameras rarely nag you to update themselves, so on most systems firmware just sits unpatched for years unless someone makes a point of doing it. That’s a core job in any decent maintenance contract, and part of why a properly maintained professional system outlasts a cheap box-shifted kit. The updates and the storage actually get looked after.

Physical upkeep: cleaning, condensation and the Midlands spider problem

Lenses and IR glass want cleaning roughly every few months, more often outdoors, with a soft brush, compressed air and a microfibre cloth. Never paper towels, they scratch the coatings. It matters more than it sounds: dust or a thin water film on the IR glass bounces the camera’s own infrared straight back into the lens, washing night footage out into a grey blur even when the camera itself is perfectly fine.

Then there’s the year-round Midlands nuisance. Warm IR cameras attract insects, insects attract spiders, and webs across the lens are the result. Clear them with compressed air or a soft brush. If you’ve cleaned the glass and it’s still dark at night, that usually points to genuine night-vision failure, failing IR LEDs or not enough power reaching them, which is an engineer job rather than a wipe-over.

One thing you should never just wipe away: condensation inside an outdoor camera almost always means the seal has failed. Wiping the outside does nothing, because the moisture is on the inside. The housing needs re-sealing or replacing before water kills the electronics, so it’s worth booking a visit rather than leaving it to get worse.

Cabling, connectors and weatherproofing in a wet climate

Outdoor connections are usually the first casualty of moisture. Water gets into a BNC, power or Ethernet connection, corrodes the metal contacts, and you end up with blurry images, signal drop-out, shorts or total loss. The fixes are well understood: corrosion-resistant connectors (nickel-plated brass or stainless), waterproof junction boxes with proper cable glands, and self-amalgamating tape over the joints.

Connectors and cabling should be inspected at each service for cracks, looseness, corrosion or discolouration, so they get caught before they fail rather than after. On weatherproofing ratings, IP66 means the housing shrugs off powerful water jets from any direction, while IP67 goes further and survives brief immersion, up to a metre for 30 minutes. Both ratings are fully dust-tight.

None of this is a sales add-on. Leicester’s damp, exposed weather genuinely accelerates connector corrosion and seal failure, so weatherproofing checks are a real maintenance priority round here. It’s also why a wired setup planned properly tends to age better, which is something we get into in our guide to choosing between wired PoE and Wi‑Fi cameras.

Reading the symptoms: what a failing system is trying to tell you

Most faults announce themselves if you know what you’re looking at. A camera showing offline points you at its power or PoE, the fuses, the cabling, and whether the network can still see it. Grainy or “snowy” footage is usually electrical interference picked up in the cabling or power, or simply a dirty lens.

A camera that’s fine by day but poor at night is typically running failing or under-powered IR LEDs once it gets dark. A system not recording at all means a full disk with overwrite switched off, a failed or failing drive, a corrupted SD card, or a lapsed cloud subscription. And gaps in footage are often an early sign of a drive on its way out, which is exactly why playback gets checked at every service. If a fault traces back to your internet connection, our explainer on what happens to CCTV footage when the internet goes down is worth a read.

DIY checks vs jobs for an engineer

Plenty of upkeep is safe to do yourself. A monthly glance that every camera is live and recording, gently clearing spider webs and wiping lenses with a microfibre cloth, and checking you’ve still got your target days of footage all count. So does the security basics: changing default passwords, turning on automatic updates where offered, and turning off remote viewing you don’t use.

Some jobs are best left alone. Anything up a ladder you’re not comfortable with, opening sealed housings, re-sealing cameras, replacing drives, re-aiming cameras and chasing electrical interference all belong with an engineer. On monitored or police-response systems the periodic service must be done by an accredited firm to keep the system to standard, so that’s not a DIY job at all.

One more reason to know where the line sits: DIY tinkering inside the kit can affect the manufacturer warranty, so it’s worth checking before you open anything. If you’re weighing up a new setup rather than maintaining an old one, our CCTV specs cheat sheet is the place to start.

Good aftercare, warranties and the cost of getting it wrong

Police and insurers recognise NSI- and SSAIB-accredited installers because they’re independently audited. For a police response URN, accredited install and maintenance are required, not optional. A proper maintenance contract schedules the visits, firmware updates, fault-finding, inspection and repair or replacement, so nothing gets forgotten between years.

Real aftercare has tells. A support line you can actually reach, a clear response window if something goes down, and remote troubleshooting before anyone has to drive out are all good signs. Manufacturer warranties commonly run a year, sometimes longer, and improper or DIY installation can void them, which is one more reason to use an accredited installer.

The honest way to look at it is total cost of ownership. A maintenance contract and planned drive replacement cost less than ad-hoc callouts, and far less than footage being unusable the one time you needed it. Plenty of Leicester buyers have been burned by a “fit-and-vanish” installer, and a clear service schedule with a response commitment is exactly the difference. It applies whether we’re looking after a home system or a business install.

The legal bit: data protection when your cameras see beyond your boundary

If your cameras only capture your own property, the household exemption applies and there’s nothing extra to do. The moment they capture a neighbour’s property, a shared alley or the pavement, UK GDPR and the Data Protection Act 2018 come into play, which is common on Leicester’s terraced streets.

Once that line is crossed, you have a few duties. Put up a notice that recording is taking place, let neighbours know, keep recordings secure with minimal access, don’t keep footage longer than necessary, and delete it regularly. You also have to respond to anyone asking for footage of themselves or asking you to delete it, normally within one calendar month.

On retention, around 31 days is sensible best-practice; there’s no fixed legal number, the rule is simply “no longer than necessary”, so keeping it longer needs a documented reason. We dig into the full set of rules in our guide to the CCTV regulations that apply to home and business cameras.

About this guide

Who wrote this

This guide is written by the Doberman install team - CCTV system designers and installers working across residential and small business properties in Leicester. We service and maintain the systems we fit, so the intervals and failure modes here reflect what we keep seeing on real visits, not a checklist copied off a datasheet.

How this guide was produced

The advice comes from patterns across maintenance visits, system health checks and callouts: which drives die early, which connections corrode first, and which faults turn out to be a dirty lens rather than dead kit. The standards references (BS 8418, NSI and SSAIB accreditation, NCSC security guidance, UK GDPR) are drawn from the published rules, not our opinion.

Why we wrote it

Maintenance is the part of CCTV nobody thinks about until footage goes missing. This guide exists to help you understand what a real service covers and what you can safely check yourself, so you can hold any installer to a sensible standard, not just us.

Disclosure

Doberman designs, installs and maintains CCTV systems, so we have a commercial interest in people choosing professional aftercare, and we’re upfront about that. We recommend planned servicing and surveillance-grade storage because that’s what keeps footage there when it matters. We’ve written this to be useful whether you choose us or not.

FAQ: CCTV maintenance and servicing

How often should CCTV be serviced?

At least once a year for a typical home or small-business system. Monitored systems built to BS 8418 want servicing at least twice a year (every six months), and anything linked to a police response URN has to be maintained by an accredited firm to that standard. Bring a visit forward if you spot condensation inside a camera, a camera going offline, or gaps in the recording.

What does a CCTV maintenance visit actually include?

A real visit goes well beyond checking the picture’s on. It covers image quality and camera aim, weatherproof seals and outdoor connections, IR and supplementary lighting, recorder and hard-drive health, and actually playing back footage to confirm it’s recording. Monitored systems also get set/unset testing, detector alignment, alarm-image receipt at the monitoring centre and a battery-backup check. You should get a written service report at the end.

How long does a CCTV hard drive last?

A surveillance-rated drive used in a recorder typically lasts around four to six years under constant 24/7 writing. A standard desktop drive dropped into the same recorder often starts failing within about 6 to 18 months because it isn’t built for non-stop streaming writes. Planned replacement is far cheaper than finding a dead drive the morning you need the footage.

Do I really need a surveillance hard drive, or will a normal one do?

You really do. Surveillance drives are firmware-tuned for the constant streaming-write pattern of CCTV and rated for a far higher yearly workload, roughly 180 TB a year versus about 55 TB for a desktop drive. A desktop drive in a 24/7 recorder tends to fail quickly, which means gaps in your footage exactly when you can’t afford them.

How many days of footage should my CCTV keep, and why does it overwrite old footage?

Around 31 days suits most homes and small shops and matches the usual insurance and police review window. Overwriting the oldest footage once the disk fills is normal loop recording, not a fault; it’s how every recorder works. If you’re only getting a few days, you’ve either outgrown your drive or it’s failing, both worth raising at a service.

Can my CCTV be hacked, and how do I stop it?

Yes, out-of-date firmware can let an attacker view your feed, disable cameras or wipe footage. The NCSC’s advice is to change any default password to a strong, unique one (it suggests three random words), keep the camera updated and switch on automatic updates if offered, turn off remote viewing you don’t use, and disable UPnP and port forwarding on your router. Keeping firmware patched is a core part of any proper maintenance contract.

Why has my camera gone blurry, grainy or dark at night?

Grainy or snowy footage is usually electrical interference in the cabling or power, or simply a dirty lens. Poor night images when daytime is fine are often dust or a water film on the IR glass bouncing infrared back into the lens, or failing IR LEDs. Clean the glass first with a microfibre cloth; if it’s still dark after cleaning, the LEDs likely need an engineer.

How do I clean a CCTV camera lens without damaging it, and stop spiders building webs on it?

Use a soft brush, compressed air and a microfibre cloth, never paper towels, which scratch the lens coatings. Warm IR cameras attract insects and then spiders, so webs across the lens are a recurring nuisance; clear them with compressed air or a soft brush every few weeks in the warmer months.

Why is there condensation inside my outdoor camera?

Persistent fog or water inside the glass almost always means the housing seal has failed. Wiping the outside won’t help, the moisture is on the inside. The camera needs re-sealing or replacing by an engineer before water reaches the electronics, so it’s worth booking a visit rather than leaving it.

What can I check myself and what needs an engineer?

You can safely glance that every camera is live and recording, gently clear spider webs and wipe lenses with a microfibre cloth, confirm you’ve still got your target days of footage, change default passwords and turn on auto-updates. Leave ladders you’re not happy on, opening sealed housings, re-sealing cameras, replacing drives, re-aiming cameras and chasing interference to an engineer. On monitored or police-response systems the periodic service has to be done by an accredited firm.

Is my home CCTV breaking data protection law if it films the street or a neighbour, and how long can I keep footage?

If your cameras only see your own property you’re exempt. If they capture a neighbour, a shared alley or the pavement, UK GDPR and the Data Protection Act 2018 apply: put up a recording notice, tell neighbours, keep footage secure and not longer than necessary, and respond to requests for footage or deletion (normally within a calendar month). Around 31 days is sensible best practice; there’s no fixed legal limit, just “no longer than necessary”, so anything longer needs a documented reason.

What should a good CCTV warranty and aftercare package cover?

Look for an NSI- or SSAIB-accredited installer (independently audited, and required if you want a police response URN), a maintenance contract that schedules visits, firmware updates, fault-finding and repair or replacement, a support line you can reach, and a clear response window. Manufacturer warranties commonly run a year, sometimes longer, and DIY or improper installation can void them, so accredited work protects both the kit and your insurance recognition.

Want your CCTV checked over before something fails?

Book a free site survey. We’ll look over the cameras, seals, connections and recorder, and tell you straight what needs doing.