Security systems installers to acquire in the UK

Name: Security systems installers to acquire in the UK
Creator: Firmbase
License: https://firmbase.co/terms

Updated 9 November 2026

Looking to acquire a security systems installer in the UK? Firmbase ranks 1,024 security systems installers using public company information to help buyers prioritise firms for research and potential outreach. The Approach Score ranks firms using public signals including director age and tenure, ownership, business scale, financial strength and recent changes. These firms are not listed for sale, and the ranking does not indicate that an owner is considering a sale.

The median firm has 9 staff and has been in business for 15 years; 14 firms are owned by groups that have acquired several firms in this sector.

Installation work and ongoing alarm maintenance bring different commitments, especially where monitoring is provided through a separate alarm receiving centre. This list covers intruder and fire alarms, CCTV and access control, including firms that also monitor systems. Before buying a security systems business, establish who holds the monitoring agreement and who responds when an alarm activates.

Acquire installers whose systems your engineers know

A security installer adds most value when its certified services match the systems your group already supports. Firmbase covers 1,024 UK limited-company and LLP installers with five or more staff. Use the ranking to locate contractors in the areas you serve, then establish the precise services each provides. A broad security activity code will not distinguish an installer from a monitoring provider.

Ownership information can reveal independent firms that merit closer study. The median security installer here has 9 staff. One person holds 75% or more in 29% of these businesses. Public records cannot tell you whether any owner wants to discuss a transaction. They can help organise research before you examine operating records.

Trace the service path from a customer fault report to an engineer visit, including any outside provider. Look at call-out records, response geography and the staff authorised to work at each site. Installation certificates and customer records may carry obligations long after equipment is fitted. For regional expansion, compare service coverage and engineer availability with the places where systems are maintained.

Use this page as a sourcing tool, not a list of businesses for sale. Verify any claimed NSI or SSAIB certification for the services it covers; both schemes are voluntary and keep their own directories. Do not treat security installation as proof of an SIA licence for guarding or key holding. Review subcontracted monitoring, insurance, customer permissions and the ability to keep systems supported through any ownership change.

1,024

Firms

24%

Every director 55+

29%

Held 75%+ by one person

Median years in business

Median headcount

£500k to £1m

Median turnover band

includes our estimates

14 firms owned by 3 groups that have bought several firms in this sector. That is 1% of this list. Groups that own firms on this list include Ranger Fire & Security. To have a group's name removed, email dave@firmbase.co.

Key facts

NSI offers a company finder for approved security and fire service providers. NSI

An NSI certificate of approval specifies the services covered by that approval. NSI

NSI says insurers sometimes insist on an alarm installed and maintained by an NSI approved company. NSI

The first 25 firms, in Approach Score order

Rank	Firm	Approach Score	The facts behind the score
1	Advanced Detection Systems Oldham, Lancashire	Approach Score 88/100	1 director aged 70 or over, 1 aged 45-49 · longest in post since 2003 2 individuals hold 75%+ · independent More about this firm 8 staff · turnover est. £391k Net assets £1.2m (Jul 2025) PSC register changed Apr 2025 Company no. 04789786 · Companies House advanceddetection.co.uk
2	Duchy Alarms ST Austell, Cornwall	Approach Score 87/100	Director aged 70 or over · in post since 2003 1 individual holds 75%+ · independent More about this firm 7 staff · turnover est. £1.4m Net assets £1.2m (Mar 2026) Company no. 04910681 · Companies House duchyalarms.co.uk
3	Technical Initiatives Ongar, Essex	Approach Score 86/100	1 director aged 65-69, 1 aged 60-64 · longest in post since 2010 1 individual holds 75%+ · independent More about this firm 6 staff · turnover est. £1.2m Net assets £1.4m (Jun 2025) Company no. 07292826 · Companies House tiuk.ltd
4	PLS Security Belfast	Approach Score 85/100	Director aged 70 or over · in post since 2017 1 individual holds 75%+ · independent More about this firm 6 staff · turnover est. £319k Net assets £103k (Oct 2025) Company no. NI648632 · Companies House padlock-security.co.uk
5	Western Security Systems Cardiff	Approach Score 85/100	1 director aged 60-64, 1 aged 55-59 · longest in post since 1991 2 individuals hold 50%+ · independent More about this firm 13 staff · turnover est. £817k Net assets £207k (Dec 2025) Charge satisfied Oct 2026 Company no. 02603708 · Companies House western-security.co.uk
6	Malthouse Security EYE	Approach Score 85/100	Director aged 65-69 · in post since 2009 1 individual holds 75%+ · independent More about this firm 6 staff · turnover est. £553k Net assets £144k (Mar 2025) Director resigned Aug 2025 Company no. 06884001 · Companies House malthouse-security.co.uk
7	Vision Technology Liverpool, Merseyside	Approach Score 85/100	1 director aged 70 or over, 1 aged 65-69 · longest in post since 2000 2 individuals hold 50%+ · independent More about this firm 5 staff · turnover est. £274k Net assets £78k (Mar 2026) Company no. 04048304 · Companies House visiontechnologyltd.co.uk
8	Clarion Security Systems Audenshaw, Manchester	Approach Score 84/100	Director aged 55-59 · in post since 1996 2 individuals hold 75%+ · independent More about this firm 28 staff · turnover est. £2m Net assets £1.4m (Mar 2026) Company no. 03173114 · Companies House clarionuk.com
9	Access & Lock Essex	Approach Score 84/100	1 director aged 65-69, 1 aged 55-59, 1 aged 50-54 · longest in post since 2002 Independent More about this firm 18 staff · turnover est. £1.2m Net assets £946k (Mar 2026) Director resigned Oct 2026 · PSC register changed Oct 2025 Company no. 04584923 · Companies House accesslock.co.uk
10	A1 Fire & Security Grantham	Approach Score 83/100	Director aged 70 or over · in post since 2015 1 individual holds 75%+ · independent More about this firm 14 staff · turnover est. £372k Net assets £92k (Jun 2025) Company no. 09598748 · Companies House a1fireandsecurity.co.uk
11	Pier Alarms Wigan	Approach Score 83/100	Director aged 60-64 · in post since 1995 1 individual holds 75%+ · independent More about this firm 8 staff · turnover est. £285k Net assets £123k (Dec 2025) Company no. 03084927 · Companies House pier-alarms.co.uk
12	DEN Jackson Solutions Norwich, Norfolk	Approach Score 83/100	Longest in post since 2002 1 individual holds 75%+ · held via a trust or firm · independent More about this firm 11 staff · turnover est. £1.1m Net assets £789k (Mar 2026) Company no. 04314417 · Companies House djssecurity.com
13	Barking DOG Security Worthing, West Sussex	Approach Score 83/100	Director aged 60-64 · in post since 2002 1 individual holds 75%+ · independent More about this firm 5 staff · turnover est. £532k Net assets £128k (Aug 2025) Company no. 04366104 · Companies House barkingdogsecurity.co.uk
14	BlakeGlow Chingford, London	Approach Score 82/100	2 directors aged 70 or over · longest in post since 2016 2 individuals hold 50%+ · independent More about this firm 8 staff · turnover est. £475k Net assets £191k (Aug 2025) Company no. 10343430 · Companies House blakeglow.com
15	Monument Fire Detection Systems West Midlands	Approach Score 82/100	1 director aged 70 or over, 1 aged 55-59 · longest in post since 2002 2 individuals hold 75%+ · independent More about this firm 6 staff · turnover est. £253k Net assets £60k (Mar 2025) Company no. 04554475 · Companies House monumentfire.com
16	V.E. Security Benfleet	Approach Score 82/100	Director aged 70 or over · in post since 2003 1 individual holds 75%+ · independent More about this firm 9 staff · turnover est. £673k Net assets £240k (Mar 2025) Company no. 01562036 · Companies House vigilanteagle.co.uk
17	1ST Metropolitan Locksmiths London	Approach Score 82/100	Director aged 70 or over · in post since 1991 1 individual holds 75%+ · independent More about this firm 5 staff · turnover est. £313k Net assets £275k (Apr 2025) Company no. 02602617 · Companies House metrolocks.co.uk
18	Globe Security Systems Stanford-LE-Hope, Essex	Approach Score 82/100	1 director aged 65-69, 1 aged under 45 · longest in post since 2009 2 individuals hold 75%+ · independent More about this firm 5 staff · turnover £620k Net assets £941k (Nov 2025) Company no. 06906956 · Companies House globesecuritysystems.co.uk
19	BEE TEE Alarms Northampton, Northamptonshire	Approach Score 82/100	2 directors aged 70 or over, 2 aged 55-59 · longest in post since 1994 2 individuals hold 75%+ · independent More about this firm 32 staff · turnover est. £1.2m Net assets £367k (Aug 2025) Company no. 02951000 · Companies House beeteealarms.com
20	N.B.E. Fire & Security Derbyshire	Approach Score 82/100	1 director aged 60-64, 1 aged 55-59 · longest in post since 2001 2 individuals hold 50%+ · independent More about this firm 9 staff · turnover est. £1.4m Net assets £1.1m (May 2025) Company no. 04219568 · Companies House nbefire.com
21	TA Security Ipswich	Approach Score 82/100	Director aged 65-69 · in post since 2013 1 individual holds 75%+ · independent More about this firm 6 staff · turnover est. £300k Net assets £72k (Mar 2025) Company no. 08445966 · Companies House tasecurity.co.uk
22	Bayley Security Middlesbrough, Cleveland	Approach Score 82/100	Longest in post since 1991 2 individuals hold 75%+ · independent More about this firm 14 staff · turnover est. £1.4m Net assets £174k (Apr 2025) Company no. 02637540 · Companies House bayleysecurity.co.uk
23	Reflex Systems Hellaby Rotherham, South Yorkshire	Approach Score 81/100	1 director aged 65-69, 1 aged 60-64 · longest in post since 2020 1 individual holds 75%+ · independent More about this firm 24 staff · turnover est. £3m Net assets £439k (Apr 2026) Charge satisfied Aug 2026 Company no. 02116908 · Companies House reflexsystems.co.uk
24	S C V Services Tamworth	Approach Score 81/100	Director aged 65-69 · in post since 2009 1 individual holds 75%+ · held via a trust or firm · independent More about this firm 5 staff · turnover est. £211k Net assets £36k (Jul 2024) Company no. 06967473 · Companies House cvsuk.com
25	Integrated Electronic Security Darlington	Approach Score 81/100	1 director aged 65-69, 1 aged 55-59 · longest in post since 2002 2 individuals hold 50%+ · independent More about this firm 7 staff · turnover est. £998k Net assets £1.1m (Feb 2026) Company no. 04384010 · Companies House iessecurity.co.uk

999 more firms are in the list, in Approach Score order.

You're seeing the first 25. Buy all 1,024 for £823 + VAT, with the facts behind each score, director names, shareholders and financials.

Buy the list of all 1,024 firms, with director names, ages and shareholders

Each row comes with the facts behind its score, financials with dates and contact details.

What's in the file

One row per firm, in Approach Score order, as Excel + CSV.

The score and the firm

Approach Score

The facts behind the score

Points for each part of the score

Financials with dates

Website

Publicly available contact details, where identified

Directors and shareholders

Director names

Director birth month and year

Director appointment dates

Named shareholders with more than 25%, with ownership bands

Some people with significant control appear as Other individual, with no further detail. Director email lookups are not included.

Frequently asked questions

What approach works for a security installer owner?

Open with your identity and the alarm or access-control services your team already supports. Tell the owner you found their details on the public Companies House register through Firmbase. Explain how to object to your use of those details, and stop if they do. Check the Telephone Preference Service and Corporate Telephone Preference Service before phoning. Avoid requesting access codes, site plans or sensitive customer information during initial outreach.

How can I verify a claimed NSI approval?

NSI advises checking its company finder or a certificate of approval for the specific services it covers. Verify the legal entity and activity, since approval for one security or fire service should not be assumed to cover another. Then examine installation records, maintenance promises and any monitoring arrangement. NSI approval is voluntary certification, not a legal requirement, although NSI says insurers sometimes insist on it.

NSI

What is the Approach Score useful for here?

The methodology page explains the public company signals behind each Approach Score. Use it to select installers for further research into ownership and financial history. It does not test the reliability of an alarm installation, the quality of monitoring or the contractual response time. Read service agreements and technical records before deciding whether an installer fits your operating plan.

How do I value alarm maintenance income?

Match recurring invoices to signed maintenance agreements, covered devices and expected visits. Separate monitoring charges from the installer's own fees where another alarm receiving centre provides the service. Check customer cancellation rights and the staff needed for call-outs. Income that looks regular in accounts can carry very different service commitments across sites.

How this list is filtered

Active on Companies House. Companies in liquidation, administration, receivership or a voluntary arrangement, or with a proposal to strike off, are left out.
Dormant companies are left out.
Firms whose owners asked to be removed are left out.
Private limited companies, public limited companies, LLPs and private unlimited companies only. Sole traders and partnerships are not covered.
Firmbase industry tag: Access Control & Security Systems or CCTV & Surveillance Systems.
SIC code 80200.
5 or more staff, from filed headcount or our estimate where none is filed.
Registered office in the UK.

How this list is built

The Approach Score ranks firms mainly on public Companies House information about owner tenure and age, ownership, size, financial strength and recent register changes.

Firms with higher scores appear first in each list.

Use the ranking to order research, then check each business directly.

Read how the Approach Score works

What it does not mean

No firm here is for sale, and the score says nothing about any owner's plans.

At least 95% of the firms where we hold directors had them checked in or after November 2026.

What we do not cover

We cover limited companies, LLPs and private unlimited companies. Sole traders and ordinary partnerships are not on Companies House, so they are not here. Regulatory information is not included in this list. Buyers should check the relevant register as part of their due diligence. The Security Industry Authority does not license alarm installation. Verify any claimed voluntary certification and its scope in the certifying body's directory, such as NSI's or SSAIB's; check SIA licences separately for guarding or key holding.

Why age bands but no people's names

Age bands come from the month and year of birth on Companies House. This page shows no exact ages and no people's names. Both come with the purchased list. The band edges from 45 to 65 are the ages where the score changes. A row shows no age bands when a director's surname is in the firm's name, its group's name or its website. Those directors' ages still count towards the score.

Is this your firm?

You can ask us to take it off every acquisition page, and out of every list we sell after that. Give us your name and work email, and we send you a link to confirm. If your email address is on the firm's own website domain, the firm comes off once you confirm. If it is not, a person reviews your request first. A list already sold stays with its buyer.

To have personal data erased, see our privacy policy.

Other areas

East Midlands East of England London North East North West Northern Ireland Scotland South East South West Wales West Midlands Yorkshire and The Humber

The standard Firmbase list

Access Control Companies in the UK