Security systems installers to acquire in Portsmouth
Updated 9 November 2026
Looking to acquire a security systems installer in Portsmouth? Firmbase ranks 13 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 11 staff and has been in business for 14 years. Looking beyond Portsmouth? Explore the full South East list of security systems installers.
13
Firms
UK 1,024
17%
Every director 55+
UK 24%
23%
Held 75%+ by one person
UK 29%
14
Median years in business
UK 15
11
Median headcount
UK 9
£500k to £1m
Median turnover band
UK £500k to £1m · includes our estimates
All 13 firms, in Approach Score order
| Rank | Firm | Approach Score | The facts behind the score |
|---|---|---|---|
| 1 | A1 Security Systems Hampshire | Approach Score 81/100 |
More about this firm
Company no. 03282992 · Companies House |
| 2 | Redvision Cctv Alton, Hampshire A director sits on 4 or more companies | Approach Score 78/100 |
More about this firm
Company no. 03952814 · Companies House |
| 3 | The Alarm People Fareham, Hampshire | Approach Score 71/100 |
More about this firm
Company no. 07899972 · Companies House |
| 4 | Holt Alarms Southsea, Hants | Approach Score 68/100 |
More about this firm
Company no. 07398579 · Companies House |
| 5 | 360fire Gosport | Approach Score 67/100 |
More about this firm
Company no. 12461970 · Companies House |
| 6 | Forward Control Portsmouth, Hampshire | Approach Score 65/100 | We hold older figures than Companies House
More about this firm
Company no. 04826824 · Companies House |
| 7 | Nexus Fire and Security Waterlooville, Hampshire | Approach Score 61/100 |
More about this firm
Company no. 08212608 · Companies House |
| 8 | ADP Security Liphook, Hampshire | Approach Score 59/100 | We hold older figures than Companies House
More about this firm
Company no. 03214405 · Companies House |
| 9 | Blayde Security Fareham, Hampshire A director sits on 4 or more companies | Approach Score 55/100 |
More about this firm
Company no. 09177761 · Companies House |
| 10 | Fusion Fire and Security Portsmouth, Hampshire | Approach Score 55/100 |
More about this firm
Company no. 13333493 · Companies House |
| 11 | Stag Systems Gosport, Hampshire | Approach Score 51/100 |
More about this firm
Company no. 12139429 · Companies House |
| 12 | Intruder Alert Systems Waterlooville, Hampshire | Approach Score 46/100 |
More about this firm
Company no. 09230264 · Companies House |
| 13 | 1122 Portsmouth, Hampshire | Approach Score 40/100 |
More about this firm
Company no. 10982973 · Companies House |
Buy the list of all 13 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.
It holds the facts behind each score, points for each part of the score, financials with dates, publicly available contact details, where identified, director names and named shareholders.
Some people with significant control appear as Other individual, with no further detail. Director email lookups are not included.
How this list is filtered
- 5 or more staff, from filed headcount or our estimate where none is filed.
- Registered office in Portsmouth.
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.
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
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.
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The standard Firmbase list
Buy the list of all 13 firms, with director names, ages and shareholders
Each row comes with the facts behind its score, financials with dates and contact details.