Register checked: SSAIB
Commercial service guide
Intruder Alarm Companies
Intruder alarm companies in our directory install, monitor and maintain graded alarm systems for commercial premises. Choose your town to compare local companies by Google rating and services, and see whether each company appears on the NSI or SSAIB register, which matters if you want police response.
- 10 companies listed
- 10 register-checked
- 4.7 average Google rating
- 3 towns covered
- Updated 2 November 2026
Where can I find a intruder alarm company near me?
You can find a intruder alarm company near you in 3 towns in our directory: Peterborough (7 companies), Spalding (3 companies) and Whittlesey (1 company). Choose your town to compare local intruder alarm companies.
Who are the highest-rated commercial intruder alarm companies?
The highest-rated commercial intruder alarm companies in our directory are Lincs Alarms (5.0 from 92 Google reviews), Swift Fire and Safety (5.0 from 82 Google reviews) and GH Security Systems (5.0 from 18 Google reviews).
Ranked by Google rating, then number of reviews. Sponsored listings do not change the order. How we check listings
Register checked: BAFE, SSAIB
Register checked: SSAIB
Register checked: BAFE, SSAIB
Register checked: BAFE, SSAIB
Register checked: BAFE, SSAIB
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What does commercial intruder alarm work involve?
Commercial intruder alarm work usually involves a site survey, a written design, installation and commissioning, handover documents, and ongoing servicing under a maintenance contract. The sections below explain what that means in practice.
UK intruder alarms are graded 1 to 4 under the BS EN 50131 series, with grade 4 the highest. Most commercial premises need grade 2 or grade 3, and your insurer will often set the grade as a condition of cover.
There are three main ways an alarm can respond. A bells-only system relies on the siren. A keyholder system calls named staff or a keyholding company. A monitored system sends signals to an alarm receiving centre, which checks each one and calls the right responder.
Police response is only available on monitored systems that meet the National Police Chiefs' Council security systems policy. The installer must be certified by NSI or SSAIB, the system is registered with the local force and given a unique reference number (URN), and it needs maintenance visits twice a year. Repeated false alarms can lead the force to withdraw response.
Many commercial systems now use confirmation from CCTV, audio or a second detector, so genuine alarms can be passed on quickly.
How much does commercial intruder alarm cost?
Commercial intruder alarm costs from £180 for a alarm receiving centre monitoring up to £5,000 for a larger or grade 3 system.
| Work | From | To | Notes |
|---|---|---|---|
| Graded system, small commercial site | £700 | £2,500 | Zones and grade set the price |
| Larger or grade 3 system | £1,500 | £5,000 | Multi-area or higher-risk premises |
| Alarm receiving centre monitoring | £180 | £480 a year | Keyholder or police response |
| Keyholding and alarm response | £300 | £900 a year | Attendance instead of your staff |
Typical ranges for commercial work. Always get a written quote after a site survey.
How do I choose a reliable intruder alarm company?
To choose a reliable intruder alarm company, check certification, grade, response and confirmation before you sign, using the questions below.
- Certification: is the company NSI Gold, NSI Silver or SSAIB certified for intruder alarms? Without this, the police will not issue a URN.
- Grade: does the quote state the BS EN 50131 grade, and does it match what your insurer asks for?
- Response: bells-only, keyholder or police response, and who holds the keys?
- Confirmation: how does the system confirm an alarm before calling the police?
- Monitoring: which alarm receiving centre will they use, and what signalling path (for example dual path)?
- Maintenance: are two visits a year included, and what is the fault response time?
Common questions about commercial intruder alarm companies
What grade of intruder alarm does a business need?
Most commercial premises need grade 2 or grade 3 under BS EN 50131. Grade 3 suits sites with valuable stock or a higher risk of determined break-ins. Your insurer will often state the grade as a condition of cover, so check the policy before you ask for quotes.
Will the police respond to my business alarm?
Only if the alarm is monitored by an alarm receiving centre and meets the National Police Chiefs' Council policy. The installer must be NSI or SSAIB certified, the system needs a unique reference number from your local force, and repeated false alarms can lead to response being withdrawn.
How much does a commercial intruder alarm cost?
A graded system for a small commercial site usually costs £700 to £2,500 plus VAT, and larger or grade 3 systems £1,500 to £5,000. Monitoring typically adds £180 to £480 a year, and a keyholding service £300 to £900 a year.
What is a URN for an intruder alarm?
A URN is the unique reference number a police force issues to a registered alarm system. The alarm receiving centre quotes it when it asks the force to attend. Only systems installed and maintained by an NSI or SSAIB certified company can be issued one.
How often should a commercial alarm be serviced?
Systems on police response need maintenance visits twice a year. Bells-only and keyholder systems are usually serviced once a year. A service should test every detector, the siren, the batteries and the signalling path, and record the results for your insurer.
Sources
- Avon and Somerset Police: alarms advice, checked 26 October 2026
- Alarm gradings and police response requirements, checked 26 October 2026
- NSI register and certification, checked 26 October 2026
- SSAIB register and certification, checked 26 October 2026
- Intruder alarm installation costs UK 2026, checked 26 October 2026
