How to choose the best burglar alarm installers in the UK (2026)
Burglar alarms are the one home improvement where who installs it changes what it can do. Only a system fitted and maintained by an NSI or SSAIB certificated company can be granted police response, and many insurers will only recognise a certificated installation. Get the installer choice wrong and you have an expensive noise-maker. This guide explains the certification, the grades, the monitoring options and what it all costs in 2026.
- Bells-only system: around £400–£1,200 installed
- Monitored Grade 2 system: around £800–£1,600 plus monitoring
- Police response: only via an NSI or SSAIB certificated installer
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NSI and SSAIB: the certification that decides everything
There is no legal requirement to be certificated to install a burglar alarm in the UK, which is exactly why it matters. Two UKAS-accredited bodies inspect and certificate security installers: the National Security Inspectorate (NSI) and the Security Systems and Alarms Inspection Board (SSAIB). Both audit a company’s technical competence, procedures, staff vetting and paperwork, and both are recognised by police forces and by insurers.
Neither is inherently better than the other. NSI has historically been more common among larger and commercial-focused firms and operates tiered schemes such as Gold and Silver; SSAIB certificates a great many capable regional and independent installers. What matters is that the firm holds current certification for intruder alarm systems — some companies are certificated only for CCTV or access control and imply it covers alarms. Ask for the certificate number and the scope, and check it on the certification body’s own register rather than taking a website logo at face value.
Why this is not just a badge
Police response to an intruder alarm is granted through a Unique Reference Number (URN) issued by your local force under the national security systems policy. A URN is only issued where the system is installed and maintained by a certificated company, meets the relevant standards, and is monitored by an approved Alarm Receiving Centre. A non-certificated installer cannot obtain one, whatever they tell you at the door.
Alarm grades and what they mean
Intruder alarms are graded under the European standard BS EN 50131, from Grade 1 to Grade 4, based on the level of threat the system is designed to resist. In practice:
| Grade | Designed for | Typical use |
|---|---|---|
| Grade 1 | Low risk, opportunist intruder | Rarely specified now; below most insurer expectations |
| Grade 2 | Intruder with basic knowledge and tools | The standard specification for most UK homes |
| Grade 3 | Intruder with knowledge of alarm systems | High-value homes, insurer-specified risks, many commercial premises |
| Grade 4 | Planned, well-resourced attack | High-security and specialist commercial sites |
Two related standards come up in quotes. PD 6662 is the scheme under which systems are designed, installed and maintained in the UK, and BS 8243 covers alarm confirmation — the sequential detection logic that reduces false calls and is required for police response. If a quote mentions none of these, ask why.
Bells-only, monitored, or police response?
- Bells-only (audible). The siren sounds and that is it. Cheapest to run, no monthly fee, and useful as a deterrent — but nobody is notified if you are away.
- App or self-monitored. The system alerts your phone. Fine for many households, though it depends on you being available and able to act.
- Keyholder monitoring. An Alarm Receiving Centre verifies the activation and calls your nominated keyholders. A good middle option.
- Police response. Confirmed activations are passed to the police under your URN. Requires certificated installation, ongoing maintenance and ARC monitoring, and is withdrawn if you generate too many false alarms.
Be realistic about which you need. Police response is genuinely valuable for isolated properties, high-value contents or where an insurer requires it. For a typical suburban home with neighbours nearby, keyholder monitoring often delivers most of the benefit for a lower running cost.
What burglar alarms cost in 2026
| System | Typical 2026 UK cost | Notes |
|---|---|---|
| Wireless bells-only, professionally installed | £400 – £800 | Quick to fit, no cabling, batteries need replacing |
| Wired bells-only, 4–8 zones | £600 – £1,200 | More disruptive to install, very reliable long term |
| Monitored Grade 2 system (typical home) | £800 – £1,600 | Certificated install, ARC-ready signalling |
| Larger home or Grade 3 system | £1,500 – £4,000+ | More detectors, higher specification, commercial premises |
| Keyholder monitoring | £10 – £25 per month | ARC verifies and calls your nominated contacts |
| Police response monitoring | £20 – £40 per month | Plus a police URN administration fee in most force areas |
| Annual maintenance visit | £80 – £180 | Required to keep certification and monitoring valid |
Add-ons worth pricing separately: extra detectors (£50–£120 each), external sounder upgrades, smart-home integration and door or window contacts on outbuildings. Note that monitored systems carry an ongoing commitment — check the contract length before you sign, as multi-year monitoring agreements are common and not always obvious in the headline price.
Alarms and home insurance
Two things to get straight before you buy. First, some insurers require a specified alarm as a condition of cover, particularly for higher-value contents, and will state the grade and monitoring level they expect. Second, where a discount is offered it is usually modest and conditional — typically on the system being professionally installed, maintained under contract, and actually set when the property is unoccupied.
The practical advice is simple: speak to your insurer before you commit to a system, get their requirement in writing, and give it to the installer. Fitting a Grade 2 bells-only system and then discovering your policy required monitored Grade 3 is an expensive way to learn this. You must also tell your insurer if an installed alarm stops working or falls out of maintenance.
Questions to ask an alarm installer
- Are you NSI or SSAIB certificated for intruder alarms, and what is your certificate number?
- What grade is this system, and is it designed to PD 6662 and BS 8243?
- Can you obtain a police URN, and what does my force charge for it?
- Which Alarm Receiving Centre do you use?
- How long is the monitoring contract, and what happens if I want to leave?
- Is maintenance included, how often, and what does it cost after year one?
- If I move or change installer, is the system proprietary or can anyone take it over?
Red flags
- Doorstep or cold-call selling with a limited-time discount — a long-standing tactic in this trade.
- Claims of police response without certification. It is not possible.
- Long monitoring contracts buried in the small print behind a cheap installation price.
- Proprietary equipment that only that company can service, locking you in indefinitely.
- No mention of grade or standards anywhere in the written quote.
- Pressure to sign before you have spoken to your insurer.
FAQs: choosing a burglar alarm installer (UK, 2026)
What is the difference between NSI and SSAIB?
They are the two main UKAS-accredited bodies that inspect and certificate security installers in the UK. Both are recognised by police forces and insurers, and neither is inherently better. What matters is that the company holds current certification specifically for intruder alarm systems, so ask for the certificate number and check it on the body's own register.
Do I need a monitored alarm to get police response?
Yes. Police response is granted through a Unique Reference Number issued by your local force, and requires the system to be installed and maintained by an NSI or SSAIB certificated company, designed to the relevant standards, and monitored by an approved Alarm Receiving Centre. Too many false alarms can lead to response being withdrawn.
How much does a burglar alarm cost to install in 2026?
Roughly £400 to £800 for a wireless bells-only system, £600 to £1,200 for a wired bells-only installation, and £800 to £1,600 for a monitored Grade 2 system in a typical home. Monitoring adds around £10 to £40 a month depending on whether you want keyholder or police response, plus an annual maintenance visit.
Will a burglar alarm reduce my home insurance?
Sometimes, but discounts are usually modest and conditional on professional installation, an ongoing maintenance contract and the alarm being set when the property is empty. Some insurers instead require a specified alarm as a condition of cover. Always confirm what your insurer expects in writing before choosing a system.
What is a Grade 2 alarm?
Grade 2 is the level under BS EN 50131 designed to resist an intruder with basic knowledge and tools, and it is the standard specification for most UK homes. Grade 3, which resists an intruder familiar with alarm systems, is used for higher-value properties, insurer-specified risks and many commercial premises.
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