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Protect your home, family and possessions with our basic Residential system, or ask us about a custom designed systems specifically tailored to your security needs. UL Certified Mercantile systems, Intruder Alert will design, install and monitor security and access control for your business around the clock.

IAS installs smoke and heat sensors wherever they're needed to help us quickly alert fire department or other emergency responders in an emergency. These are high security systems used in banks and high-end retail busnesses where complete security is required, often by insurance companies.
Reviews (4)
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Tamira Lee
Feb 13, 2020
This company is a total scam. Used it for security on our buisness and all they did was come install everything but they haven't provided any of the services they mentioned. When our system alarms due to power outtage, disconnected Phone line or any thing that may trigger the red control center box nobody calls to notify us or checks and see what's going on.

We are not being monitored appropriately or getting the services they said the would provide. Yet they are constantly demanding more money due to our contractual obligation but they are NOT doing anything to assist with our concerns. Please save your money and reconsider working with this company if you plan on it. Also the customer support lady is rude. Definitely will be contacting the better business bureau about this one
Courtney Pelzel
Jun 07, 2019
We needed a partner to do access control and security for our clients and met Mike at Intruder alert many years ago. He and his team have performed at an above average level on every project we have worked with them on. Excellent service and expertise and I would recommend them for any security or access control needs.
Acton Brumley
Nov 17, 2018
I used this company for security service because the home builder uses them to install all the low voltage in there homes. Big mistake do not use this company the service is terrible if their is a problem with anything they want to charge you $ 95.00 service call to come fix what they installed. There are better security companies out there with better prices and that will stand behind what they put in. This company was suggested by Sitterle Homes, so if you are building with them do not use this company.
C. Cormier
Oct 31, 2018
Its great to work with local businesses. There is nothing like having a local San Antonio company I can trust for my home and business security needs. I have worked with the same couple of guys for the past several years. Tired of calling and speaking with a customer service rep who is probably halfway around the world? BUY LOCAL and let the team at Intruder Alert take care of your security system!