Trusted physical security for every Denver facility

Kastle is one accountable partner for physical security in Denver. We design, install, monitor, and maintain your entire program, so your team stops coordinating vendors and starts running the building. One contract covers every door across the metro.

3,600+

Properties protected

50+

Years in
security

#1

G2, Spring 2025

24/7

Monitoring & response
Protecting over 1 billion square feet globally
The world's most trusted organizations traded juggling vendors for consistency, predictability, and ROI from one provider.
Security teams on the ground across the Denver metro

Kastle serves Denver and the surrounding metro, including Aurora, Lakewood, Arvada, Centennial, Littleton, Westminster, Thornton, Broomfield, and Boulder, a market of more than 27,000 employer establishments. Local coverage means a team that knows the difference between securing a downtown high-rise, a warehouse along the I-70 corridor, and a suburban office park, and can be on site quickly when a Denver property needs attention. Design, installation, and service happen locally, while monitoring runs through Kastle's national security operations center. One partner covers every door across your Denver footprint, whether that is a single building or a portfolio spread across the metro.

Denver, CO

Serviced from Kastle's regional office and national SOC.

  • (855) 527-8531

  • 1355 S. Colorado Blvd., Suite C113 Denver CO 80222

  • 10-second average alarm response

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Built, run, and owned by one team

One partner designs, installs, monitors, and enhances security

Most Denver buildings run into trouble not at the hardware but at ownership. No one owns the system after install, and small gaps go unwatched until an incident exposes them. Kastle has owned the full security lifecycle since 1972, and today protects more than 10,000 properties and 60,000 businesses across the United States and Australia. That ownership matters locally right now. Denver police report 83% of alarm calls in the city are false, and responding to them cost roughly $600,000 in 2023. Managed, verified response is what keeps a Denver alarm meaningful.

Site assessment and system architecture for physical security in Denver

Every Kastle program starts with a design built around your building. Security architects assess your Denver property, its entry points, and daily traffic, then specify the system around what they find. The risk isn't spread evenly across the metro, so the design has to be local. Through the first half of 2025 citywide burglaries fell 7%, yet the downtown core moved the other way, with District 6 burglaries up 22%. A system scoped to your specific address protects better than one dropped in from a template.

  • Free on-site audit maps entry points and blind spots.

  • Design scoped to your Denver submarket's actual risk.

  • One architect owns the plan through install and beyond.

Site assessment and system architecture for physical security in Denver

From first call to live

How Kastle stands up security for Denver sites

  • Consult & design: We assess your Denver property, entry points, and risk, then architect the system around your outcome.
  • Install: In-house Kastle technicians deploy and commission every device. No subcontractor handoffs.
  • Monitor: Our 24/7 security operations center watches your system and verifies alarms before dispatch.
  • Maintain: Ongoing upkeep, updates, and compliance are included for the life of the system.

Licensed, permitted, compliant

Denver licensing and compliance, handled for you

  • Denver alarm company license
  • Alarm permit and monitoring
  • Enhanced Call Verification
  • Biometric access compliance
Get the Free Denver Physical Security Guide

A practical guide for facility teams evaluating physical security: how to spot the gaps where your building falls short, how access control and video work together, and how to keep entry seamless for staff and visitors.

  • Spot where your security falls short.

  • How access and video work together.

  • Seamless entry for staff and visitors.

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Customer reviews

Why customers choose Kastle

Exceptionally rated for ease of use, set up, and support.

Rated 4.6 out of 5 on G2

9.3

Ease of use

#1

In physical security, spring 2025
  • Effortless remote access with stellar support.
    Ana C. Assistant Property Manager
  • Great products and fast, helpful customer service.
    Edgar G. Manager
  • Convenient phone-as-a-key access and a great visitor portal.
    Philanthropy
  • Excellent products and fast service.
    Paula E. Office Manager
  • User-friendly and smooth experience with always-available support
    Commercial real estate