Best DIY Home Security Systems for 2025: No Monthly Fees Required

Why Go DIY for Home Security?

Traditional home security means a contract, monthly fees, and a system you don't actually control. Professional monitoring from ADT or Vivint can run $30 to $60 per month, which adds up to $360 to $720 per year for the privilege of having someone call you when your alarm goes off. After running professional monitoring for two years and having it trigger exactly once (a false alarm from my cat), I switched to a DIY setup and haven't looked back.

DIY security doesn't mean compromising on safety. Modern self-monitored systems send instant push notifications to your phone, can trigger loud sirens, flash lights, lock doors, and even record video, all without a monthly fee. Some also offer optional professional monitoring if you want it for vacations or peace of mind, without locking you into a contract.

I've tested or extensively researched every system on this list. Here's what actually works in 2025, ranked by who they're best for.

Home Assistant + Alarmo: Most Customizable, Completely Free

Overview

If you're already running Home Assistant (or willing to set it up), the Alarmo custom integration turns your existing sensors into a full-featured security system at zero ongoing cost. Alarmo, available through the Home Assistant Community Store (HACS), provides a professional-looking alarm panel with arm/disarm controls, entry/exit delays, multiple arm modes, and automated actions.

What You Get

• Arm Modes: Armed Away, Armed Home, Armed Night, Armed Vacation, and a custom bypass mode. Each mode can use a different set of sensors with different delays.
• Multi-Area Support: Split your house into zones (upstairs, downstairs, garage) that arm independently.
• User Codes: Assign unique PIN codes with different permission levels to family members, housekeepers, or dog walkers.
• Actions: When triggered, Alarmo can send push notifications, activate a siren, flash smart lights (Philips Hue or LIFX strobing red is genuinely alarming), lock smart locks, and start recording on cameras.
• Alarmo Card: A custom Lovelace card gives you a clean keypad interface on tablets or phones.

Sensors and Hardware

Alarmo works with any sensor that Home Assistant recognizes. The most common setup uses Zigbee door/window sensors (Aqara sensors are the community favorite at about $12 each) paired with a Zigbee coordinator. Motion sensors from Aqara, Philips Hue, or IKEA TRADFRI work as well. For a siren, you can use a smart plug connected to a loud alarm, a Zigbee siren like the Aqara M1S hub's built-in alarm, or even repurpose a smart speaker.

Monitoring Options

Self-monitoring only, with push notifications through the Home Assistant Companion App. There's no professional monitoring option, but you can use the Noonlight integration for paid monitoring through Home Assistant if you want it.

Pros and Cons

Pros: Unlimited customization. No recurring fees ever. Works with virtually any sensor brand. You own all the data. Can integrate with cameras, locks, and anything else in Home Assistant.

Cons: Requires Home Assistant knowledge. If your Home Assistant server goes down, so does your alarm. No cellular backup unless you set one up yourself. Initial setup takes hours, not minutes.

Best For

Home Assistant users who want maximum control and zero ongoing cost. People who already have Zigbee or Z-Wave sensors deployed.

Ring Alarm: Best Hardware Ecosystem

Overview

Ring's alarm system benefits from Amazon's massive hardware ecosystem. The 2nd-gen Ring Alarm base station, contact sensors, motion detectors, and keypads are well-built and easy to install. The hardware is Z-Wave based, which means reliable wireless communication that doesn't burden your Wi-Fi network.

What You Get

The Ring Alarm 8-piece kit (around $200) includes the base station, keypad, four contact sensors, a motion detector, and a range extender. Ring also offers glass break detectors, flood/freeze sensors, smoke/CO listeners, and a panic button.

Without a Subscription

You can arm, disarm, and self-monitor your Ring Alarm with no subscription, but only from the physical keypad. Without a Ring Protect plan, you won't receive push notifications when the alarm triggers, and you won't have cellular backup. The siren on the base station will still sound, which is better than nothing, but the lack of notifications makes subscription-free Ring Alarm significantly less useful than competitors.

With Optional Monitoring

Ring Protect Plus starts at $20/month and includes 24/7 professional monitoring, cellular backup, extended warranty, and video recording for all Ring cameras at your location. The Ring Protect Basic plan at $4.99/month covers a single camera but doesn't include alarm monitoring.

Integration

Deep integration with Alexa: "Alexa, arm Ring in Away mode." Ring cameras (Ring Video Doorbell, Spotlight Cam, etc.) integrate seamlessly. Works with Home Assistant through a community integration, though it's cloud-dependent.

Pros and Cons

Pros: Polished app, reliable hardware, huge accessory ecosystem, affordable professional monitoring, easy installation.

Cons: Self-monitoring without subscription is severely limited (no push notifications). Amazon-owned, so privacy is a concern. Ecosystem is tied to Ring/Alexa. No HomeKit support.

Best For

Amazon/Alexa households who want a reliable system with the option to add professional monitoring. People who already have Ring cameras and doorbells.

Abode: Best Without Subscription

Overview

Abode stands out because its free plan is actually usable. Unlike Ring, the Abode Basic Plan (free) lets you arm/disarm from the mobile app, receive push notifications, and view live camera feeds. You get real self-monitoring capability without paying a dime after the hardware purchase.

What You Get

The Abode Smart Security Kit (starting at $179.99) includes a gateway, a key fob, a mini door/window sensor, and a motion sensor. Additional sensors and accessories are available a la carte. Abode also offers cameras, smart locks, and water sensors.

Free Plan Features

• Arm/disarm from the app
• Push notifications when triggered
• Live camera viewing (no recording/storage)
• Smart home integration with Alexa, Google, and HomeKit
• CUE automations (Abode's automation engine)

Optional Monitoring

Self-monitoring with additional features runs $7.99/month. Professional monitoring with 24/7 dispatch is $25.99/month. No contracts on either tier.

Smart Home Integration

Abode is one of the few security systems that works with all three major ecosystems: Alexa, Google Home, and Apple HomeKit. This is a significant advantage if you're in the Apple ecosystem, where security system options are limited. The HomeKit integration means you can use Abode sensors as triggers for other HomeKit automations.

False Alarm Management

Abode handles false alarms well. Entry delays give you time to disarm when you walk in, and the app lets you quickly cancel an alarm before it escalates. If you're on the professional monitoring plan, you get a verification call before dispatch.

Pros and Cons

Pros: Genuinely usable free plan. HomeKit, Alexa, and Google support. No contract required. Good false alarm handling. Clean app design.

Cons: Hardware is more expensive than Ring. Sensor selection is smaller than Ring. Camera quality is mediocre. The gateway uses Z-Wave and Zigbee but the device compatibility list is limited to Abode-branded sensors for best reliability.

Best For

Users who want real self-monitoring for free. Apple HomeKit households. People who want the option to add professional monitoring without a contract.

SimpliSafe: Easiest to Use, but Subscription-Dependent

Overview

SimpliSafe is the most mainstream DIY option and the easiest to set up. Peel the backing off a sensor, stick it on your door, and you're done. The hardware is solid, the app is clean, and setup takes 15 minutes or less. However, SimpliSafe really wants you to pay for a subscription, and the free experience is bare-bones.

Without a Subscription

SimpliSafe without a subscription gives you a siren that goes off when triggered. That's essentially it. No push notifications, no app control, no camera recording, no smart home integration. You're limited to arming and disarming from the keypad. It functions like a basic alarm from the 1990s.

With Subscription

This is where SimpliSafe shines. The Core plan ($32.99/month as of mid-2025) includes 24/7 professional monitoring, app control, push notifications, and smart home integration. Higher tiers add camera recording and active guard features. These prices are competitive with traditional alarm companies, but they're the highest on this list.

Hardware Quality

SimpliSafe's sensors are well-designed and reliable. The base station has a built-in cellular connection and a 24-hour backup battery. Environmental sensors (water, freeze, smoke, CO) are available and work well. The outdoor camera has decent image quality. The Video Doorbell Pro is competitive with Ring's offerings.

Pros and Cons

Pros: Easiest setup of any system. Professional-quality monitoring. Good hardware design. No contract required. Built-in cellular backup.

Cons: Free plan is nearly useless. Monthly fees are on the higher side ($23-$50/month). Limited smart home integration. No HomeKit support. Proprietary ecosystem.

Best For

People who want professional monitoring without a long-term contract. Non-technical users who want a simple, polished experience and don't mind paying for it.

Aqara Alarm System: Best Budget HomeKit Security

Overview

Aqara's approach is different from the others on this list. Rather than selling an "alarm system," Aqara sells affordable sensors and hubs that you assemble into a security system yourself. The Aqara Hub M3 (around $80) acts as both a Zigbee coordinator and a security base station with a built-in siren.

What You Get

The Hub M3 supports Zigbee, Thread, and Matter. Door/window sensors cost around $12-15 each. Motion sensors are about $20. Water leak sensors, vibration sensors, and temperature/humidity sensors are all under $20. You can build a comprehensive 10-sensor system for under $250.

Security Features

Using the Aqara app, you can create alarm modes that trigger the hub's built-in siren and send push notifications when sensors are tripped. Through HomeKit, you can set up automations that flash lights, lock doors, and activate scenes when the alarm triggers. The Security Enhanced Kit bundles the hub with sensors specifically for this use case.

HomeKit Native

Aqara sensors expose as HomeKit devices through the hub (via Matter or directly through HomeKit). This means they work with Apple's Home app natively, and you can use HomeKit's own security system feature to arm/disarm. If you're an Apple household, this is the most affordable way to build a HomeKit-native security system.

Integration

Beyond HomeKit, the Hub M3 works with Alexa, Google Home, Samsung SmartThings, and Home Assistant. Aqara sensors are also favorites in the Home Assistant community thanks to their reliability and low cost.

Pros and Cons

Pros: Very affordable sensors. Native HomeKit, Matter, and Zigbee. No subscription fees ever. Hub M3 is versatile (security + smart home). Excellent battery life on sensors (2+ years typical).

Cons: No professional monitoring option. No cellular backup. The built-in siren is quiet compared to dedicated alarm base stations. Setting up alarm automations requires some configuration. No keypad (you arm/disarm from the app or via NFC tags).

Best For

Budget-conscious users. Apple HomeKit households. Home Assistant users who want affordable, reliable Zigbee sensors. People building a security system incrementally.

Eufy Security System: Best Local Processing

Overview

Eufy's pitch is simple: local storage, local processing, no monthly fees. The Eufy HomeBase stores all video locally with up to 16 TB of expandable storage, processes AI detection on-device, and sends push notifications without requiring a subscription. This addresses the privacy concern that Ring and other cloud-based systems raise.

What You Get

Eufy's security kits start at around $160 and include a HomeBase hub, entry sensors, motion sensors, and a keypad. The HomeBase has a built-in siren (100 dB), 16 GB of onboard storage, and Wi-Fi connectivity. Eufy also sells standalone cameras (indoor, outdoor, doorbell) that work with the same ecosystem.

Local Processing Advantages

• AI detection: Person, pet, and vehicle detection happen on the HomeBase, not in the cloud. This means faster notifications and no subscription for AI features.
• Video storage: All footage is stored locally on the HomeBase. No cloud subscription needed for playback. Expandable up to 16 TB with an external drive.
• Privacy: Your video never leaves your home unless you explicitly share it.

Optional Cloud Storage

If you want cloud backup, Eufy offers plans starting at $3.99/month for one camera or $13.99/month for unlimited cameras. But unlike Ring, these are truly optional. The system is fully functional without them.

Smart Home Integration

Eufy works with Alexa and Google Home for voice commands. HomeKit support is available on select cameras. Home Assistant integration exists through a community integration. The ecosystem is more limited than Ring's but covers the basics well.

Pros and Cons

Pros: Local processing and storage. No subscription required for core features, including AI detection. Affordable hardware. Good camera quality. 16 TB expandable storage.

Cons: No professional monitoring option. The app has had some design criticisms. The ecosystem is smaller than Ring's. Some users have reported connectivity issues with the HomeBase over Wi-Fi. Eufy faced a privacy controversy in 2022 over unencrypted cloud access, though they've since addressed it.

Best For

Privacy-conscious users who want cameras without cloud subscriptions. People who want AI-powered detection without monthly fees. Users who prefer local storage over cloud storage.

Building Your Own vs. Buying a Kit

The decision between a pre-built kit and a DIY system depends on your technical comfort level and how much customization you want.

Buy a Kit If:

• You want to be up and running in under 30 minutes.
• You want a single app that controls everything.
• You want the option of professional monitoring.
• You're not interested in tweaking settings or automations.
• You want customer support when something goes wrong.

Build Your Own If:

• You're already running Home Assistant, Hubitat, or SmartThings.
• You want to choose the best sensor from any brand rather than being locked into one ecosystem.
• You want complex automations (e.g., "if motion detected AND it's between midnight and 6 AM AND nobody is home, trigger the alarm AND record cameras AND flash Hue lights red AND send a notification with a camera snapshot").
• You want zero ongoing costs.
• You enjoy the process of building and optimizing systems.

A Hybrid Approach

My current setup is a hybrid. I use Aqara door/window sensors and motion sensors connected to Home Assistant through a Zigbee coordinator, with Alarmo managing the alarm logic. But I also have Eufy cameras running independently with local storage, and Reolink cameras providing additional coverage with onboard microSD recording. The Alarmo system handles intrusion detection, and the cameras handle visual verification. Total monthly cost: $0.

Final Recommendations

• Best overall (no fees): Aqara sensors + Home Assistant + Alarmo. Most flexible, most customizable, truly $0/month.
• Best polished experience (no fees): Abode with the free plan. Real app-based self-monitoring without paying.
• Best cameras (no fees): Eufy. Local AI processing and local storage without subscriptions.
• Best with optional monitoring: Ring Alarm. Great hardware ecosystem, affordable monitoring when you want it.
• Best for Apple households: Aqara Hub M3 with HomeKit. Native integration at the lowest sensor cost.
• Best for non-technical users: SimpliSafe with a monitoring plan. Easiest setup, most polished, but you're paying for it.

The era of being forced into expensive, contract-heavy security monitoring is over. Whether you spend $100 on Aqara sensors and set up Alarmo, or $200 on an Abode kit with the free plan, you can protect your home without writing a monthly check. And if you want professional monitoring for specific periods (like a two-week vacation), most of these systems let you add and cancel it on demand, without penalties.