Looking for a DIY Self Hosted Alarm System Bill of Materials

I made this up at https://www.alarmsystemstore.com before my house needed repairs and ate my budget. This was $2-3k worth of gear. I believe I had the transceiver so I could use the wireless keypad for programming. And I had a few wired smoke detectors for the 2nd floor where I could use the attic to run wiring fairly easily. There is a tri-zone sensor with some wired sensors; you wire 3 contact sensors to the wireless trizone so you can have a window bank as one zone at lower cost. I don't have a land line so the GSM communicator seemed prudent. And the envisalink is the ethernet adapter so an automation controller can run it. They also will program the system for you, which is a giant help.

No idea if any of this is discontinued or covid unavailable.

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Pre-program for DSC Power Series Systems

DSC Kit64-219SE Power 1864 Alarm System Kit

DSC WTK5504 Wireless Touchscreen Keypad

DSC WS4916 Wireless Smoke Detector w/ built-in heat sensor

DSC EV DW4975 Vanishing Wireless Door Window Transmitter

DSC TR5164-433 PowerSeries 2-Way Wireless Transceiver Module

RE304 wireless driveway / vehicle sensor for DSC

DSC WLS914-433 Dual Lens Wireless Pet Motion Sensor

TANE 60QCWH Mini Surface Mount White Contact 10 Pack

DSC WS4965 Tri Zone Wireless Door / Window Transmitter

DSC-FSA-410BST 4 Wire Smoke Detector With Heat and Sounder

DSC RM-1 Power Supervision Relay for 4-wire Smokes

DSC AC100 Acuity Glassbreak Sensor

EnvisaLink 4 IP Communicator Security Interface Module

DSC 3G2060RUSA GSM Communicator Cell Backup

GSM/IP Monitoring Add-On

Base Alarm Monitoring Service Fee For One Year

DSC WS4939 Four Button Keychain Remote

MONITORING ACTIVATION FEE [MONITORINGBASE]

Step one: decide if you want a "proper" alarm system, or generic sensors which you can use to trigger an alarm in HA. If you go for the generic sensors, there are lots of possibilities & you can build your own "alarm system" with the Manual Alarm integration. The advantage of this approach is that you have freedom in choosing sensors, but the downside (for me) is that it does not give a really "safe" feeling.

If you go for a full-blown alarm system, the next step is to check what alarm systems have proper integration with HA, there may be big differences in support and capabilities. Honestly, any reputable brand should be fine on the security side, so the only question is if they play nice with HA. I have a (wired) Satel Integra and it works perfectly.

For wireless sensor compatibility, I would stay within one brand. Even if sensors are supposed to be compatible, you may get unpredictable results. (wired is not such a problem) As to what sensors you need, for me the minimum is indoor motion detectors & a smoke/fire detector (many people forget this!). If you add a door/window detector, look for one that combines vibration and open/closed detection as this covers most use cases.

Personally I don't have the door/window detectors, but we are in a low-crime area. Your situation may require a higher degree of protection detection.

If you would go for a Satel Integra, you can find starter packs at different webstores, for example here (site in Dutch unfortunately). ABAX2 is the wireless system of Satel with encrypted 2-way communication making it secure. To this you would have to add the sensors you need (as said, stick to the same brand) and an ethernet communication module.

Sorry this is not a shopping list, but making one is quite impossible without more information on the layout of your house/appartment, your specific needs and your budget.