Security system costs in London vary widely depending on what you need. Here's an honest breakdown of what you should expect to pay — and where people often end up over or underpaying.
Why Costs Vary So Much
Security system pricing depends on several factors: the type of system, the size of the property, the quality of the components, the amount of cable routing involved, and whether you want ongoing monitoring. A basic home alarm and a full commercial security installation are completely different propositions.
The figures below are realistic installed costs from a professional London security company — not DIY kits from a retailer.
CCTV Installation Costs
- Small system (4K camera, recorder, app viewing): from £600 installed
- 4-camera HD system with NVR and 1TB storage: typically £600–£1,500
- 8-camera HD system with remote viewing app: £1,200–£2,000
- Additional cameras added to existing system: £150–£300 each
Intruder Alarm Costs
- Basic bells-only alarm (3-4 zone wired): £400–£700
- Wireless bells-only system: £500–£900
- Professionally monitored Grade 2 alarm: £700–£1,400 installed + £15–£35/month monitoring
- App-connected smart alarm: £500–£1,000
Fire Alarm Costs
- Grade D interlinked smoke/heat alarms (domestic): £200–£500 installed
- HMO fire alarm system (Grade D, LD2): from £600 installed, depending on storeys and rooms
- Small commercial panel system: £800–£2,500
- Annual service contract: £100–£250 per year
Access Control Costs
- Single door fob system: £400–£800 installed
- Video door entry (audio + camera): £350–£700
- Multi-door office access control: £600–£2,000+
What You're Actually Paying For
The installation fee covers materials, labour, certification, and the engineer's time. A professional installation from an accredited company also includes a full warranty on parts and workmanship, proper certification (essential for insurance), and access to ongoing support.
Cheaper quotes often mean cheaper components, faster (less thorough) installations, and no proper documentation. That can cost you far more in the long run — through failed inspections, insurance disputes, and repeat call-outs.
Security Red Alert provides free, no-obligation site surveys across London. We'll tell you exactly what you need and what it will cost — upfront, with no hidden extras.
Need help with this in London?
Security Red Alert covers all 32 London boroughs from our Summerstown SW17 office. Explore our Residential Security, Commercial Security and Get a Free Quote services, or call 020 8946 5567 for a free survey.