Locally owned. Built for projects of any size
Reliant Security is a locally owned security and low-voltage integrator based in O'Fallon, Missouri. We design, install, service, and monitor systems for homes, custom homes, multi-family communities, commercial buildings, industrial plants, and government facilities.
Most companies pick a lane. Residential alarm dealers don't pull fiber across a manufacturing campus, and commercial contractors aren't interested in a house. Reliant does both — the same technicians, the same design discipline, and the same standard of finish whether it's four sensors and a doorbell camera or site-wide surveillance, access control, and a fiber backbone tying six buildings together.
That range is deliberate. It means we can start with a customer on their home, grow with their business, and still be the right call when they need a specified, compliant installation for a public-sector project.
What makes us different
The reasons customers pick us — and, more often, the reasons they stay.
Locally owned and operated
Reliant is based in O'Fallon, Missouri, and run by people who live here. You deal with the same local team from the first walkthrough to service years later — not a call centre in another state.
Built for projects of any size
Local ownership doesn't mean limited capability. We handle single-family alarm systems and large, complex commercial, industrial, and government installations with the same team and the same standards.
Not tied to any one manufacturer
We aren't locked into a single manufacturer or proprietary platform. Systems are designed around what your site actually needs — including NDAA/TAA-compliant equipment where a project requires it.
One team, end to end
Security, surveillance, access control, structured cabling, fiber, and audio/video all come from us. There's no gap between the cabling contractor and the systems integrator, and no argument about whose problem it is.
24/7 professional monitoring
Systems are backed by a UL-certified, fully redundant central-station network averaging a 9.4-second response, monitoring intrusion, smoke, and carbon monoxide every hour of the year.
Accredited and accountable
Reliant holds BBB A+ accreditation and strong Google and Angi reviews — earned on installations we still stand behind and service.
What it looks like day to day
Most of what a monitored system does is quiet. A camera picks something up, the platform decides whether it matters, and your phone tells you — no siren, no phone call, just a notification with the clip attached.
Below is a short demo from Alarm.com, one of the platforms we install on, showing a doorbell camera catching a delivery and flagging it in the app. The alerts that aren't deliveries — a door opening after hours, motion where nobody should be, a verified alarm — reach our monitoring center at the same time they reach you.
A note from Reliant
We started Reliant because too many people were being sold a system instead of a solution — a box on the wall, a long contract, and a call centre three states away when something went wrong.
We do it differently. You get the same local team from the first walkthrough through to service years later. We design around what your building actually needs rather than what we happen to stock, and we explain the trade-offs in plain language so you can make the call yourself.
That approach is why most of our work still comes from referrals, and why customers who start with us on a house come back when they open a business. If you're weighing up your options, call us — even if you don't end up choosing Reliant, you'll get a straight answer.
The Reliant team
Reliant Security · O'Fallon, Missouri
Who we serve
From a single household to a Department of Defense facility.
Residential
Alarms, cameras, smart control, and monitoring for homes.
Custom Homes
Pre-construction design, structured cabling, AV, and whole-home integration.
Multi-Family
Access control, intercoms, and common-area surveillance for communities.
Commercial
Offices, retail, healthcare, and warehousing across the metro and beyond.
Industrial
Plants and manufacturing sites, including harsh-environment installations.
Government & DoD
Federal, State, Municipal, and Department of Defense facilities.
Featured work
A sample of the installations we've delivered — with more added as projects wrap.
Site-wide video surveillance for a hot-dip galvanizing plant
Industrial-grade camera coverage across production, dock, and yard areas at an active galvanizing facility.
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Production and yard surveillance for a galvanizing operation
Full-site video coverage spanning the production floor, loading areas, and outdoor material storage.
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Industrial surveillance across a multi-building galvanizing site
Camera coverage and supporting network infrastructure connecting separated buildings on one industrial campus.
View projectTechnology partners
Reliant isn't tied to one manufacturer or proprietary platform. We design around what each project actually needs — including NDAA/TAA-compliant equipment where it's required.
What our customers say
Rated 5.0 out of 5 from 52 Google reviews.
“We had a great experience working with Dave and the Reliant team. From start to finish, the communication was clear, professional, and consistent. The crew showed up on time, worked efficiently, and made sure everything was completed the right way. The quality of the installation really shows. You can tell they take pride in their work and pay attention to the details. Dave followed up afterward to make sure we were happy, which speaks a lot about their customer service and commitment. I would absolutely recommend Reliant to anyone looking for a company that stands behind their work and delivers on what they promise.”
“We came to Dave with a unique set of safety & security concerns for our son with a rare genetic disorder, Prader-Willi Syndrome. Dave was thorough in researching the best fit for our family & presented multiple options to fit our family's specific needs. From consultation to cleanup, Dave was very attentive & personable; truly a pleasure to have working in our home. Installation was flawless & WOW the quality of the system is truly impressive! We are very pleased with Reliant & would highly recommend their services for your safety & security needs.”
“Excellent work, Dave is a great guy and does spectacular work. The install couldn’t have gone better A+ recommended!”
“Dave is the best in the business for home security. He installed a whole home security system in our home in St. Charles. The cameras are crystal clear, installation was perfect and the price was great! We wanted to work with a local, family-owned company for our home security, and as a father, I wanted to work with a family man that takes home security as seriously as I do. Couldn't be happier with the service, thanks Reliant!”
“Great experience! Very knowledgeable, professional and punctual. Awesome communication throughout. I highly recommend reliant!”
Reviews from Google, shown as written by their authors.
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