Townhouse Security: Shared Walls, HOA Rules, Monitoring

Where a townhouse can be entered

Shared walls are an advantage. An interior unit usually has entry points on two faces only, front and back, and an end unit adds one side. That makes a townhouse cheaper to cover than a detached house of the same size.

A motion sensor on the ground floor, placed to see the path from the back door to the stairs, catches most of what the door sensors miss.

The attached garage is the entry people forget. If the garage has a keypad or remote opener and an unlocked door into the house, the garage door is effectively your front door. Our guide to garage security covers openers and the house-entry door.

What to check in your HOA rules

Townhouse communities often have an HOA with rules about the outside of the building. Rules vary by community and state, so the only reliable answer is your own documents: the CC&Rs, bylaws and any architectural guidelines. Items worth looking for before you buy anything:

• Exterior cameras: whether they need approval, where they may be mounted, and whether they may view common areas or a neighbor's property.
• Video doorbells: whether replacing the doorbell counts as an exterior change.
• Doors and locks: whether a new front door, storm door or visible lock hardware must match a set style or color.
• Signs and stickers: whether yard signs are allowed in shared landscaping.
• Exterior lighting: whether motion lights or brighter fixtures need approval.

Alarm sensors inside your unit rarely raise HOA questions because nothing changes outside. Cameras do, because they face shared space. If you rent the townhouse, the landlord's rules sit on top of the HOA's, and our guide to home security for renters covers what tenants can usually install; a guide to landlord rules on security cameras covers that layer, and our guide to video doorbells for apartments covers no-drill doorbell options.

One recording caution applies anywhere: point cameras at your own doors and property. Audio recording laws vary by state and are stricter than video rules in many places, so check before turning on audio.

When monitoring makes sense for an attached home

Shared walls change one part of the monitoring math: neighbors are close. They are likely to hear a siren, and smoke in the unit next door is a risk to you. That argues for two things.

First, monitored smoke and carbon monoxide detection matters more in attached housing, because a fire next door can become your fire. If no one is home to hear an alarm, only a monitored system calls for help. Second, self-monitoring works better in a townhouse than in an isolated house, because a loud siren with neighbors a wall away is more likely to draw attention. Neither is a guarantee of anything; they are reasons the trade-off shifts.

Published monitoring prices for the plans covered here, as of October 2026:

The 30-day column is our arithmetic on per-day rates. If you would rather compare professionally installed systems, we can fetch real quotes through a short questionnaire.

Townhouse, condo or duplex

The three housing types sit on a spectrum. A condo usually has one entry door and a building entrance the association controls, which our guide to condo security systems covers. A duplex or multi-family building adds shared entrances and an owner who may live on site; see duplex and multi-family security. A townhouse is closest to a detached house: you control your own doors and garage, and the HOA controls the outside look. That is why the sensor plan above looks like a small house plan, while the camera plan depends on your HOA.