Feel Invincible

Residential Services

ADT is America’s #1 Home Security Company

24 hour monitoring from four ADT Monitoring Centers.

Invincible Security – Locally owned and operated by Mark Donakowski an ADT authorized dealer since 1997.

Commercial Services

Invincible Security and ADT offers industry leading intrusion detection products and systems that are professionally built on open platforms so that they can be easily integrated with other ADT solutions to create the most effective security systems.

Contact Us

Invincible Security Inc
9896 Rosemont Dr Suite 102
Lone Tree, CO 80124

(720) 291-2841


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  • Welcome
  • About Us

Welcome to Invincible Security Inc.

Security Commitment


Invincible Security, an ADT authorized dealer, is committed to excellence and affordability when it comes to securing your home. With an experienced and professional local company backed by the industry leader, ADT we are the best choice to provide your home or business security needs.

img_1The owner of Invincible Security, Mark Donakowski, has over 30 years in the security industry all affiliated with ADT. As an ADT dealer for over 14 years, Mark has extensive knowledge of ADT’s support and policies. With personal commitment and attention of a local company and the strength and support of ADT our customer’s get the benefits associated with both a small company and a large corporation. With direct involvement in the business Mark makes sure that every aspect of a customer’s experience is courteous, prompt and professional. We bring personal attention and detail to each customers unique needs. We have security solutions for any situation, so our customers feel Invincible to any of today’s risks.

Getting a security system was one of the best things we ever did for our family. Although we live in a high end, gated community, security to us is a necessity not a luxury because it gives us complete peace of mind. I love the “emergency” button on the control panel, especially when my husband is out of town. (more…)

One of the best things we ever did for our family!

Pam in Lone Tree