About Castlegate Alarms | Alarm Services East Grinstead

Protecting Homes with Precision, Integrity, and Experience

Since 2007, Castlegate Alarms has been the trusted choice for homeowners looking for expert intruder alarm services in East Grinstead and surrounding areas. As a one-man operation led by seasoned alarm engineer Steve Kelly, we deliver tailored, high-quality alarm installations, repairs, and smart system upgrades with unmatched consistency and personal service.


Castlegate Alarms is proud to offer same-day emergency callouts and long-term peace of mind through our monthly maintenance plans and repair expertise.


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Our Story

Founded in 2007, Castlegate Alarms was built on the belief that homeowners deserve responsive, honest, and expert support when it comes to protecting their property. With years of hands-on experience working with both modern and legacy alarm systems, Steve saw an opportunity to do things differently by focusing on skilled service, not sales targets.



Trusted in everything from modest homes to high-end properties with names instead of numbers, we’ve built a reputation on doing the job right the first time.

What We Stand For

We believe home security should never be a one-size-fits-all service. That’s why we’re committed to:

  • Honest, pressure-free advice – No upselling, no unnecessary replacements
  • Fast response times – Emergency callouts available, often same-day
  • Expert workmanship – Decades of experience across all alarm brands
  • Long-term protection – Over 100 homeowners trust us with their maintenance plans


From Pyronix smart alarms to fully integrated alarm.com systems, we ensure your setup matches your lifestyle, with options including video capability, mobile app access, and monitored responses.


Meet Your Engineer


Castlegate Alarms is led by Steve Kelly, a sole technician with a hands-on approach to every job. That means no subcontractors, no changing faces, just a reliable, professional expert who knows your system and your needs inside and out.


Steve’s dedication to his clients is clear in every callout, whether it’s a new installation in  East Grinstead, a smart upgrade in Tunbridge Wells, or a legacy system repair in Worthing.

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What Makes Us Different

In a market where many companies push replacements and outsource work, Castlegate Alarms remains proudly independent and focused on providing quality alarm services in East Grinstead and Beyond.


  • Can repair any alarm brand – Including those others won’t touch
  • Sole operator model – Ensures consistent service and clear communication
  • Trusted in high-end homes – Known for professionalism, discretion, and results
  • Smart home ready – Advanced systems with app access, cameras, and alerts



We’re not just alarm installers, we’re long-term partners in your home’s security.



Hear From Our Customers

With over 50 verified 5-star reviews on Google, Castlegate Alarms is recognised for reliability, responsiveness, and respectful service. Our clients stay with us for years, thanks to our honest advice, quick action, and dependable results.

Ready to Secure Your Home?

If you're looking for alarm services in East Grinstead, new installations in Brighton, or smart home security in Guildford, Castlegate Alarms is here to help.


Call us today on 07769 554 464 or email info@castlegate-alarms.co.uk to book your appointment.