Picking the wrong sensor installation company can leave gaps in your security coverage, wasted money, or worse—a system that doesn't actually detect threats. Before you sign a contract, you need to ask the right questions to understand exactly what you're getting and who's doing the work.
Ask About Their Experience With Your Specific Sensor Type
Motion sensors and intrusion detectors aren't one-size-fits-all. Passive infrared (PIR) sensors, microwave sensors, dual-technology detectors, and glass break sensors all require different expertise to install correctly. Ask the installer whether they've worked with the exact brands and models you're considering—PIR sensors from one manufacturer may have different sensitivity settings or placement requirements than another's.
Get specific about their portfolio. How many installations have they completed in the past year? Do they have references from businesses or homes similar to yours? A company that's installed 500+ systems will spot installation mistakes that a newcomer might miss, like placing a motion sensor where sunlight will cause false alarms.
What's Included in Their Installation Service?
Don't assume "installation" means the same thing everywhere. Some companies charge a flat fee; others charge hourly ($75–$150 per hour is typical). Ask whether the quote includes:
- Site assessment and layout planning
- Wiring and conduit installation
- Sensor calibration and testing
- Integration with your existing security system or control panel
- Documentation and user manuals
Installation alone might cost $200–$600 per sensor depending on difficulty and location. Ask if they charge extra for running wires through walls, ceilings, or conduit, or if that's baked into the base price.
Do They Handle System Design?
A good installer doesn't just place sensors randomly. They should conduct a walkthrough and recommend a coverage plan based on entry points, room layouts, and blind spots. Ask how they determine sensor placement. Do they use a floor plan? Will they map out coverage zones before installation begins?
This matters because a poorly designed system leaves vulnerabilities. For example, a motion sensor in a hallway might not cover a side window, or dual-technology sensors might be overkill in a low-risk area where a basic PIR makes more sense. Their design should balance protection with false-alarm reduction.
What's Their Warranty and Support Plan?
Ask for a written warranty on both labor and equipment. Typical coverage runs 1–3 years on parts and 1 year on labor. But also ask: What happens if a sensor fails six months in? Do they replace it free, or charge you a service call fee ($50–$150)?
Find out their response time for service calls. If your system goes down, can they send someone within 24 hours? Do they charge extra for after-hours or weekend support? Some companies bundle ongoing monitoring and maintenance into a monthly fee ($20–$50/month); others charge per incident.
Will They Test the System With You?
Before you pay the final bill, the installer should walk you through the completed system. Ask them to:
- Trigger each sensor and verify it registers on your control panel
- Show you blind spots or areas with limited coverage
- Demonstrate how to arm, disarm, and test the system yourself
- Explain the sensitivity settings and how to adjust them if you get false alarms
This test run catches installation errors early and gives you confidence the system actually works.
How Do They Handle Integration?
If you already have a control panel, alarm system, or smart home setup, ask whether they've integrated sensors with those platforms before. Some installers specialize in standalone systems; others excel at tying motion and intrusion sensors into a larger security or automation ecosystem. Confirm they can program the sensors into your existing panel and that they understand the programming requirements.
Check Credentials and Insurance
Always verify they're licensed and insured. Ask for proof of general liability insurance (minimum $1 million) and, if required in your area, an alarm technician license. Don't rely on their word—ask for documentation.
Platforms like Mercoly make it easier to compare trusted Intrusion & Motion Sensors providers in one place, so you can review credentials, read verified reviews, and get multiple quotes without the legwork.
Frequently Asked Questions
Q: How many sensors do I actually need? A: That depends on your layout, but most homes need 4–8 motion sensors and intrusion sensors on all entry points. A professional assessment should specify your exact needs rather than a one-size-fits-all approach.
Q: Can I install motion sensors myself, or do I need a professional? A: Simple battery-powered wireless sensors are DIY-friendly, but wired sensors and complex layouts typically require professional installation to ensure proper coverage and integration with your control panel.
Q: What causes false alarms with motion sensors, and can installers prevent them? A: Sunlight, pets, ceiling fans, and improper placement cause most false alarms. Experienced installers prevent them by choosing the right sensor type, calibrating sensitivity correctly, and positioning sensors away from heat sources and direct sunlight.
Start your search for a trusted installer today and get quotes from multiple providers to compare pricing and expertise.