What Actually Deters Burglars? The Research-Backed Answer

Most home security advice is a product pitch dressed up as guidance. Buy this camera. Install this alarm. You’ll be safe. But what does the actual research say — the studies that asked convicted burglars directly what made them choose one house over another, and what made them walk away?

The answers are more nuanced than the security industry wants you to think, and some of what genuinely deters burglars costs nothing at all.

First, Understand Who You’re Dealing With

The popular image of a burglar — a skilled professional casing homes for weeks — doesn’t match reality. The University of North Carolina at Charlotte conducted one of the most comprehensive studies on burglar behavior, surveying 422 convicted offenders across three state prison systems. Their finding: only 12% of burglars usually planned their invasion in advance. Forty-one percent acted on impulse.

This is the most important thing to understand about deterrence. You’re not trying to stop a determined professional. You’re trying to make a largely opportunistic person decide your home is more trouble than it’s worth — and move on to an easier target. That’s a much more achievable goal.

A few more baseline facts worth knowing:

72% of burglaries happen when nobody is home. Burglars aren’t looking for confrontation — they’re avoiding it.
Most happen during the day. In 2024, daytime burglaries (216,601) outnumbered nighttime ones (174,053). The window between 10am and 2:30pm — when most people are at work — is peak time.
The average burglar lives nearby. Studies consistently show 50–54% of burglars operate within two miles of their target. They know the neighborhood, the patrol patterns, and which homes are regularly empty.
The average burglary lasts 8–12 minutes. Speed is everything. Anything that slows entry or increases the chance of getting caught is a meaningful deterrent.

What the Research Actually Says Works

1. Alarm Systems — The Single Strongest Deterrent

The UNC Charlotte study found that 83% of burglars said they would check for an alarm before attempting a break-in. Of those, 60% said they would simply move on to a different target if they found signs of one. Among the more deliberate, planning-oriented burglars — the ones who pose the greatest risk — this effect was even stronger.

Critically, the study found that signs of an alarm — yard signs, window stickers — had nearly as much deterrent effect as the alarm itself. This makes sense: most burglars don’t want to test whether the system is real. The UNC researchers concluded that visible security indicators are among the most cost-effective deterrents available.

The FBI’s data supports this at scale. Homes without a security system are 300% more likely to be burglarized than those with one. Burglary rates in the US have declined 26% since 2019, a trend researchers partly attribute to the broader adoption of affordable home security technology.

2. Visible Outdoor Cameras

Cameras work through two mechanisms: deterrence (the burglar sees them and leaves) and evidence (footage helps identify and prosecute). The deterrence effect is real but conditional. A camera mounted high on a wall with a blinking light and a visible lens is a meaningful signal. A camera hidden inside a potted plant is evidence — but it won’t stop someone from entering.

The UNC study listed outdoor cameras and surveillance equipment as one of the key factors burglars considered when selecting targets. Placement matters: a camera covering the front door is less valuable than one covering the approach to your property — the driveway, the side gate, the backyard. Burglars case homes before entry. A camera that catches that reconnaissance is more valuable than one that only captures the moment of entry.

3. Occupancy Signals — Often More Powerful Than Technology

Because 72% of burglaries happen when no one is home, anything that credibly signals occupancy is a deterrent. This includes:

A car in the driveway. Consistently cited by burglars surveyed in the KGW news study as one of the most effective deterrents — more reliable than signs or cameras.
Lights on timers. A house that goes dark every night at 9pm on a predictable schedule broadcasts vacancy. Randomized light timers that vary day to day are meaningfully more effective.
Audio cues. TV or radio sounds audible from outside. Again, KGW’s survey of convicted burglars listed this alongside cars and lights as the top deterrents.
Mail and package management. An overflowing mailbox or three packages piled on the porch is a clear signal no one has been home. Hold mail when traveling, and use a video doorbell with package detection notifications.

4. Dogs

Dogs are effective deterrents — but size matters less than noise. A small dog that barks loudly at an approach is arguably more useful than a large, quiet dog. Barking draws neighbor attention and raises the perceived risk of detection. That’s what burglars are avoiding.

The research caveat: determined burglars sometimes bring treats to neutralize dogs. This is documented. Dogs are a deterrent for opportunistic burglars — the 41% who act impulsively — but less reliable against planned break-ins.

5. Entry Point Hardening

Here’s something that gets underemphasized in security marketing: 34% of burglars enter through the front door. 22% through the back door. 23% through first-floor windows. Most of them use force — but 30% enter through unlocked doors and windows.

This means the cheapest effective security measure available to most homeowners is consistently locking doors and windows, including when leaving briefly. After that, the upgrades with the most impact are:

Door reinforcement. Standard door frames fail quickly under a kick. Reinforced strike plates with 3-inch screws are a $20 fix that meaningfully improves resistance.
Smart locks. Auto-lock features eliminate the “I forgot” problem. A door that locks itself when you leave is more reliable than one that depends on habit.
Window locks and sensors. Entry sensors that alert you when a window opens are cheap and reliable. A burglar who triggers an alert — and hears the alarm sound — at window entry has a strong incentive to leave.

What Doesn’t Work As Well As You Think

Neighborhood Watch Signs Alone

Neighborhood watch programs that involve active community participation — neighbors who actually know each other, report suspicious activity, and communicate — have documented crime reduction effects. Signs alone, without the social infrastructure behind them, have weaker evidence. A burglar who’s already operating in the neighborhood knows whether anyone is actually watching.

Fake Cameras

The research on fake cameras is mixed. They may deter the most impulsive, unsophisticated opportunists. But anyone who’s done even minimal reconnaissance can usually identify a dummy camera — no cable, wrong housing, non-functional LED patterns. The risk of relying on fake cameras is that you believe you have deterrence when you don’t. Real cameras at a single critical entry point are worth more than fake cameras everywhere.

High Fences Without Visibility

Counter-intuitively, tall privacy fences can help burglars by concealing their work from neighbors and the street. A fence that blocks sight lines into your backyard also blocks sight lines from anyone who might see something suspicious. Thorny hedges or decorative fencing that maintains visibility is more effective than solid privacy fencing on perimeter security grounds.

The Practical Priority Order

If you’re building a security setup from scratch — or want to know where your next dollar is best spent — here’s what the research supports, ranked by impact:

Visible alarm system with yard sign and window stickers. Highest documented deterrence rate. Start here.
Consistent occupancy signals — car in the driveway, light timers, not broadcasting vacations on social media.
Outdoor cameras at entry points and approach paths, visibly mounted. Cover the driveway and backyard approach, not just the front door.
Entry point hardening — reinforced door frames, consistently locked windows and doors, smart locks with auto-lock.
A dog, even a small loud one — effective primarily against opportunistic burglars.
Community relationships. Knowing your neighbors, and having them know your normal routine, is free and effective.

The Honest Bottom Line

No security measure eliminates risk entirely. The 13.5% burglary clearance rate — meaning only about 1 in 7 burglaries results in arrest — tells you that even when crimes happen, outcomes for victims are often poor. The goal of deterrence isn’t a guarantee. It’s raising the perceived risk and effort of targeting your home above the threshold that most opportunistic burglars will accept.

The research consistently points to the same conclusion: visibility matters more than sophistication. A burglar who sees an alarm sign, a camera, and lights on at random hours will almost always pass your house for an easier target. You don’t need a $3,000 security system to achieve that. You need a visible alarm, a couple of well-placed cameras, and habits that make your home look occupied.

The security industry benefits from selling you complexity. The actual evidence suggests the fundamentals — done consistently — do most of the work.

What to Put in Place First

If you want to act on this research, here’s a practical starting point. A basic alarm system with a visible keypad, yard sign, and cellular backup covers the single highest-impact deterrent. Adding one or two outdoor cameras at approach points covers the next layer. Smart locks eliminate the “unlocked door” vulnerability that accounts for nearly a third of all entries.

You don’t need all of it at once. The research says even partial visible security — a sign, a camera, a light on a timer — shifts burglar attention to less-prepared homes. Start with what you can, and build from there.

For specific product recommendations, see our guides to the best home security systems, best wireless outdoor cameras, and best video doorbells — all chosen with deterrence effectiveness in mind.