Trusted local security for homes & businesses across Missouri and Kansas.
Family-owned for decades. Professional installation, monitoring, cameras, access control, and fire alarm system monitoring — backed by real people you can actually reach.
- Serving Missouri and Kansas
- Residential & commercial systems
- Fire alarm system monitoring, cameras, access control, intercoms, video doorbells
- Local installation, service & monitoring
New system · Local installation & support
Prima by NAPCO
Smart security. A more connected home.
Meet our new alarm system: an all-in-one touchscreen panel that puts security, live video, and compatible smart-home controls at your fingertips — at home or through the Prima App.
New to Three D?
Start with a system designed for your home and family, professionally installed and supported by our local team.
Ready for an upgrade?
Existing customers can ask about upgrading to Prima. We’ll review your current equipment and explain your options.
Touchscreen security
Arm your system, check doors and windows, and see system status on an easy-to-use panel.
Control from your phone
Use the Prima App for remote security control, real-time notifications, and live video viewing.
Smarter video options
Add compatible cameras and a video doorbell with AI human detection and live two-way voice.
Connected home options
Connect compatible locks, lights, and thermostats, plus optional smoke, CO, and water-leak sensors.
Features depend on selected equipment, compatible devices, and service plan. Cameras, smart-home devices, and environmental sensors are optional. Contact us for pricing and upgrade compatibility.
Complete protection — designed, installed, and supported locally
From a single home alarm to multi-building commercial systems, we handle the whole job and stand behind it.
Security System Installation
Professionally designed alarm systems built around your home or business — not a one-size-fits-all kit.
Fire Alarm System Monitoring
Code-compliant fire alarm monitoring to protect lives and property.
Surveillance Cameras
HD camera systems with mobile viewing so you can keep an eye on what matters from anywhere.
Access Control
Control who comes and goes with keypads, fobs, and smart locks for offices, warehouses, and facilities.
Intercom Systems
Modern intercoms for homes, businesses, gates, and multi-building properties.
Medical Alert Solutions
Help is one button away — peace of mind for seniors and loved ones living independently.
24/7 Monitoring & Support
Professional monitoring with fast dispatch, plus real local technicians when you need service.
Upgrades & Takeovers
Already have a system? We can service, upgrade, or take over many existing setups — no full replacement needed.
Protect your home, your family, and the things you care about most
From entry-point sensors to full smart-home integration, we design home security systems around your property — not a sales script. Add cameras, monitoring, smart locks, and mobile alerts whenever you're ready.
- Custom-designed alarm systems for your home
- Indoor and outdoor HD cameras with mobile viewing
- 24/7 professional monitoring options
- Smart locks, doorbell cameras, and entry control
- Help upgrading or replacing older systems
Built for offices, retail, warehouses, churches, and multi-building sites
Whether you run a small business or manage multiple facilities, we design scalable systems that give you control, visibility, and peace of mind — and we're here long after the install.
- Access control for one door or hundreds
- HD camera coverage with remote viewing
- Burglar and fire alarm system integration
- Service plans and ongoing technical support
- Solutions for offices, retail, warehouses, churches, and property managers
Don't start from scratch — we can upgrade or take over your existing system.
Many homes and businesses already have alarm or camera equipment that's outdated, unmonitored, or no longer supported. In most cases, we can service, upgrade, or take it over without ripping everything out.
- Take over and modernize your existing equipment
- Add cameras, access control, or monitoring to what you already have
- Get professional help if your current setup is unsupported
- Honest evaluation — we'll tell you when an upgrade is worth it
We can monitor most existing systems and save you money — please contact us for details. No phone line? No problem — our state-of-the-art alarm cellular communicator can transmit alarm signals to our local monitoring center.
A real local company — not a faceless national brand or a DIY box
DIY systems leave you on your own. National chains forget you after the install. We do neither.
Real local support
Talk to a real person in Missouri and Kansas — not an overseas call center.
Custom system design
We design around your property and your priorities, not a sales script.
Homes and businesses
From single-family homes to multi-building commercial sites, we do both well.
We back what we install
Service, upgrades, and support after the sale — for years, not weeks.
Better than DIY
Professional design and installation that actually works when you need it most.
Monitoring that responds
24/7 professional monitoring with fast, reliable dispatch.
Proudly serving Missouri and Kansas
Based in Lee's Summit, Missouri, we serve homes and businesses across Missouri and Kansas.
- Kansas City, MO
- Kansas City, KS
- Lee's Summit
- Independence
- Blue Springs
- Overland Park
- Olathe
- Lenexa
- Shawnee
- Liberty
- Gladstone
- Raytown
- Belton
- Raymore
- Grandview
- Leawood
Not sure if you're in our area? Just give us a call.
A straightforward process from first call to ongoing support
Consultation
We listen first — your property, your concerns, your goals.
System Design
A custom plan and honest quote built around what you actually need.
Professional Installation
Clean, careful installation by trained local technicians.
Service & Monitoring
Ongoing support, monitoring, and upgrades whenever you need them.
Trusted by homeowners and businesses across the metro
“They walked us through every option without pressure. The install was clean and the team actually answers when we call.”
“We needed access control across two buildings. Three D designed it right and trained our staff. Solid, dependable people.”
“Our old monitoring company disappeared. Three D took over our existing system, fixed what was broken, and we're paying less.”
Refer a friend or family member and receive two months monitoring free.
When someone you send our way becomes a Three D customer, we thank you with two free months of professional monitoring. It's our way of saying thanks for spreading the word.
Buying or selling a home? Talk to Faye Whitney.
Faye Whitney is a Kansas City real estate agent — and part of our family. If you're looking for your next home, or getting one ready to sell, she can help you do it right. Then we'll help you protect it.
- Missouri and Kansas expertise
- Buyers and sellers welcome
- Straight answers, no pressure
- Independent of Three D Security
A family referral. Real estate services are provided independently of Three D Security Systems Plus.
Answers to common questions
Don't see your question? Call (816) 554-2986 — a real person will help.
Get a free, no-pressure quote
Tell us a little about your home or business and a local team member will follow up — usually the same business day.
After you submit, we'll reach out to schedule a free consultation. No pressure, no hard sell.
Talk to a local security expert today
Free, no-pressure consultation. We'll help you protect what matters — at home or at work.
Family-owned. Local technicians. Serving Missouri and Kansas.