"Keeping you safe and the intruders out."

Expert installation of burglar alarms in Hertfordshire & London.


cctv systems

We install a range of CCTV systems for personal and business needs. All of our systems can be tailored to specific requirements, budgets and property surroundings. We specialise in linking  your CCTV systems to your iPhone or iPad for viewing on the move!

burglar alarms

We install intruder alarms for a range of clients from residential, small shops to offices and large commercial properties. We're happy to advise on which alarm would be best for you and your requirements. 

entry systems

We provide a wide range of access and entry phone systems to suit any requirement. From simple to complex entry systems, we can tailor our access control around any commercial or industrial premises.

Security system installation across London.

3rd Century Ltd is an independent security company that installs, repairs and maintains a wide range of security systems.

All our work is carried out with an extremely high standard and our finish is always as discreet as possible.  

Operating throughout the south of England, we offer our services to the residential, commercial, retail, industrial & public sectors.

At 3rd Century Ltd:

  • Over 30 years' experience

  • Working hours around your schedule

  • Free consultation

  • Accurate quotations

Security Systems and Alarms Inspection Board

'SSAIB only certificate companies who demonstrate competence and professionalism in the management of their business. Certificated provided must also demonstrate technical competence and professional conduct when it comes to providing security services or fire detection services.'