How to Split Home Security System Costs With Roommates in 2026

How to split cost of a home security system with roommates — Ring, SimpliSafe, ADT. Who pays, who owns the account, and what happens when someone moves out.

Someone finds out the apartment down the hall got broken into. Suddenly your group chat is deciding whether to get a Ring doorbell, a SimpliSafe kit, or full ADT. Great — until you have to figure out who’s actually paying for it, whose name the account goes under, and what happens when someone moves out and takes the app on their phone with them. If you’re trying to figure out how to split the cost of a home security system with roommates, here’s the setup that doesn’t blow up in six months.

What’s the fairest way to split home security system costs with roommates?

The fairest way to split home security system costs with roommates is to split the hardware upfront based on rent share, put the monitoring subscription on a rotating name with an even monthly split, and have anyone who leaves get bought out at prorated depreciated value. That way nobody feels stuck paying for equipment they can’t take, and nobody feels like they own a system they didn’t fully pay for.

That’s the whole framework. Now the details.

Hardware — cameras, sensors, base station, doorbell — is a one-time expense. The person in the master bedroom benefits the same as the person in the smaller room, but the person paying more rent generally has more stuff worth protecting and more skin in the game.

Two ways to split:

Even split. Simple, works for close friends. Everyone pays the same share of the upfront cost. Fine if the hardware is under $300 total.

Rent-share split. If you’re splitting rent unevenly by room size, apply the same ratio to security hardware. Someone paying 40% of rent pays 40% of the SimpliSafe kit. This is fairer for larger installs where the cost matters.

Get receipts and put the split in writing before you buy anything. “We agreed Sam pays $180, Alex pays $120.” One text message with everyone’s confirmation is enough.

Who’s name goes on the monitoring subscription?

Monitoring subscriptions (Ring Protect, SimpliSafe Interactive, ADT) are monthly. Someone has to be the account holder — the app is tied to one login, and cancellation and billing changes go through that person.

Rotate it. Sam holds it year one, Alex holds it year two. Or just pick whoever’s most likely to still be on the lease longest. Whoever holds it gets the monthly bill on their card and everyone else Venmos their split.

Skip the trap of “let’s use my mom’s Amazon account for the Ring subscription.” When Mom decides to cancel it or you move out, the system breaks. Use a household account you all control.

How do you split the monthly monitoring fee?

Split it evenly. It’s a flat monthly fee that everyone benefits from equally — you all sleep better knowing the sensors work. Even split, auto-reminded on the 1st, done.

If you already have a system for splitting utilities, add security to the same bucket. If you don’t, this is a good moment to standardize. We covered that in how to split utility bills with roommates.

What happens when a roommate moves out?

This is where most shared purchases go sideways. The hardware isn’t portable — you can’t take the doorbell off the wall and split it. So how do you handle it?

Buyout at depreciated value. Say the SimpliSafe kit was $300 new. After a year, it’s worth maybe $150 used. The remaining roommates buy out the leaving roommate for their share of $150. If Sam paid $100 originally and now the depreciated share is $50, they get $50 back.

Just eat it. For small installs (a Ring doorbell, one camera), it’s often easier to say “you contributed, you got a year of security, we’re even.” Nobody wants to fight over $40. Make this the default for anything under $100 total.

They take the system. If they’re the account holder and the hardware transfers to their next place, they buy out the roommates staying. Reverse of the buyout.

Whatever you pick, agree on it before someone gives notice. If you’re already in a situation where a roommate’s leaving mid-lease, we broke down the rest of the money splits in roommate moving out before lease ends.

Should you skip monitoring and just do a Ring doorbell?

Real talk: for most college and post-college apartments, a $150 Ring doorbell + a couple of $30 smart plugs and window sensors gets you 80% of the peace of mind at 10% of the cost. Full ADT-style monitoring makes sense for high-crime areas or houses with expensive gear, but it’s overkill for a lot of shared apartments.

If you go the DIY route, still write down who owns what, who’s on the account, and what happens when someone leaves. Skipping the paperwork is what turns “we’re all in on this” into a fight later.

How homies handles shared purchases

homies. lets you log a shared purchase, set the split, and track what each person paid — so when someone moves out, the buyout math is already done. You can see the depreciation, the remaining balance, and settle up in one tap. No more digging through Venmo history from 14 months ago.

rooming, minus the drama. Join the waitlist at joinhomies.app.