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The CNET team has years of hands-on testing, with hundreds of hours of experience and plenty of insights to share. With all that expertise in mind, our pick for the top DIY home security system is the reliable, expandable, eight-piece, second-gen Ring Alarm Kit. Read more: How to Turn Your Old iPhone or Android Into a Home Security Camera for Free We also offer options for those who already use various smart home technologies, along with tips to consider while shopping for security solutions. If you want to start a little smaller, check out our lists of the best indoor security cameras and out

We've tested systems for more than 180 hours, including the latest kits and updates for 2026, and nothing beats SimpliSafe's starter kit as the top choice for the average homeowner. SimpliSafe's hardware packages start at $250 and go up to $734. However, we've observed that there are often deals that let you buy this security system for a discount. It's incredibly DIY friendly while also offering robust monitoring plans and sharp new AI features for those who want them. Anyone can install its compact sensors, including renters, thanks to the adhesive options. Our other options include kits for

After thorough testing, the best smoke detector in 2026 proved to be Kidde smart smoke detector. It builds on the excellent performance of previous Kidde devices while adding new smart features -- but it doesn’t force you to use the app if you’d rather not. I’ve also picked the best detectors for Nest users, Ring fans, home security setups and more -- so be sure to check out the full list.