Most break-ins are opportunistic
The useful thing to understand about residential burglary is that it is overwhelmingly opportunistic rather than planned. It is quick, it is local, and it is very sensitive to friction and to the chance of being noticed. Which means the goal is not to build a fortress. It is to make your house the one where the effort, the noise and the visibility are all a little higher than someone was willing to accept, and to be honest, most of that comes from hardware and habits rather than electronics.
That also means the highest-value work is boring: an entry door that does not give way, an unlocked window that gets locked, a light that comes on, a neighbor who looks up. Many police departments will walk your property and point out weak spots for free if you ask, which is worth doing before you spend money.
Doors fail at the frame, not at the lock
The lock is rarely the weak part. The frame is. A standard strike plate is held by two short screws that bite only into the thin jamb trim, so force applied to the door transfers straight into a quarter inch of soft pine. Replacing those with a heavy strike plate and three-inch screws that reach the structural stud behind the jamb is a fifteen-minute job with a screwdriver, costs a few dollars, and is the single highest-value security upgrade in most houses.
| Element | What good looks like |
|---|---|
| Deadbolt | A real deadbolt with a full one-inch throw, in addition to the knob latch |
| Strike plate | Heavy plate, three-inch screws into the framing, on both the deadbolt and the latch |
| Hinges | At least one long screw per hinge into the stud; doors that swing out need non-removable pins |
| Door itself | Solid core or metal on exterior openings; a hollow interior door used outside is not an exterior door |
| Glass beside the door | Sidelights and glass panels near a lock argue for a keyed interior cylinder or laminated glazing |
| Sliding doors | Working latch plus a bar or pin in the track, and hardware that stops the panel being lifted out |
| Garage-to-house door | Treat it as an exterior door — deadbolt and all — because the garage is a soft outer layer |
Smart locks are fine and mostly convenient rather than protective; whatever the electronics do, the bolt and the frame are still what resist force. If you use keypad entry, treat the code the way you would a password — not a birthday, changed occasionally, not shared indefinitely with people who no longer need it. The password generator is as useful for a door code as for a login.
Windows, and the rest of the ground floor
The most common way into a house through a window is that it was unlocked. Ground-floor windows, basement windows, and anything reachable from a fence, a flat roof, a balcony or a stacked pile of firewood deserve working locks and the habit of using them. Windows left open a few inches for air on a summer night are worth a vent lock that limits travel.
Do a walk around your own house in daylight and look at it as a stranger would: which openings are hidden from every neighbor and from the street? Those are the ones to reinforce and to light. Anything stored outside that helps someone reach an upper floor — ladders especially — belongs locked in a shed or a garage.
Lighting and sightlines
Lighting works because it makes people visible, not because it is bright. A floodlight aimed so it dazzles anyone looking at the property has made things worse, not better. Motion-activated fixtures at entries and along the dark side of the house are more useful than a permanently lit yard, and they also tell you something: a light that comes on when you are inside gets your attention in a way a constant one does not.
Sightlines matter as much. Shrubs under windows and beside the front door should stay below sill height, and low branches near entries should be cleared, so nobody at your door is hidden from the street. Inside, a lamp or two on a timer or a smart plug in the evening does more for a house that reads as occupied than any sticker. If you are laying out fixtures, the lighting layout calculator covers spacing and coverage, and the appliance power calculator will tell you what leaving things on actually costs.
Deliveries, mail and being away
| Situation | What reduces risk |
|---|---|
| Packages | Delivery to a locker, a workplace, or a neighbor who is home; scheduled delivery windows; bring boxes in the same day |
| Mail while away | Hold mail at the post office, or have someone collect it daily |
| Trip photos | Post them after you are home, not from the beach |
| Yard while away | Someone mowing or shoveling; a car parked in the drive |
| Lights while away | Timers or smart plugs on varied evening schedules |
| Flattened boxes | Break them down and put them inside the bin, not stacked at the curb advertising what arrived |
Package theft in particular is a volume crime with an easy answer: the box that is not sitting out is not taken. Everything else in this table follows the same principle — a house that is clearly being used and attended to, whether or not anyone is home this week.
Cameras, and being reasonable with them
A doorbell camera is genuinely useful for two things: seeing who is at the door without opening it, and having a recording afterward. It is weaker as a deterrent than people hope, and it is not a substitute for a door that holds. Point cameras at your own entrances and your own property. Aiming one into a neighbor's windows or across a shared hallway creates a problem where you did not have one, and recording rules — especially anything capturing audio — vary by state and can be stricter than people assume. Renters and residents of managed buildings should check the lease or the association rules before mounting anything, including on a shared exterior wall.
If you run any of it through an app, the account is now part of your security. Use a unique strong password and turn on two-factor authentication, keep the router firmware current and its admin password changed from the factory default, and put cameras on a network you actually control.
The week you move in, and the people next door
Rekey or replace every exterior lock in the first week. You have no idea how many keys are out there, and previous tenants, contractors, cleaners, agents and a former partner are all plausible holders. Change every keypad code and reset any smart lock or camera to a fresh account rather than inheriting one. Check that every window latches, find the electrical panel and the water shutoff, and look at the garage door opener, which usually has a manual release worth understanding.
Then meet the neighbors, which sounds soft and is not. The most reliable detection system on any street is somebody who knows what normal looks like and has your number. That is what makes an unfamiliar van at three in the afternoon into a phone call rather than a shrug — and it is the one part of home security that costs nothing, needs no maintenance, and works while you are asleep.
Questions people ask
What is the single most effective thing I can do?
Reinforce the door frame. Most forced entries defeat the frame rather than the lock, because a standard strike plate is held by two short screws that bite only into thin jamb trim. Replacing them with a heavy strike plate and three-inch screws that reach the structural stud behind the jamb takes about fifteen minutes and a few dollars per door, and it changes how much force the opening will take. Do the deadbolt and the latch plate, and put at least one long screw through each hinge while you are there.
Do security cameras prevent break-ins?
They help less than most people expect and are more valuable after the fact than before it. A doorbell camera is genuinely useful for seeing who is at the door without opening it and for having a recording to hand to police, but it does not stop a door from being forced. Treat cameras as an addition to solid hardware, lighting and visibility rather than a replacement. Point them at your own property, check your state rules if the device records audio, and check the lease or association rules before mounting anything in a rental or a shared building.
Should I change the locks when I move in?
Yes, in the first week, on every exterior door. You cannot know how many keys exist or who holds them — previous tenants, contractors, cleaners, agents, a former partner. Rekeying is cheaper than replacing hardware and is enough. Also change every keypad code, reset any smart lock or camera to a new account of your own rather than inheriting the old one, and check that all the windows latch while you are still unpacking and paying attention to the place.
Does leaving lights on all the time help?
Not especially. A house lit identically at three in the morning and three in the afternoon reads as unoccupied to anyone paying attention, and constant floodlighting can leave glare and deep shadows that make a person harder to see rather than easier. Motion-activated lights at entries are more useful, because they draw attention when something changes and they alert people inside. Indoors, lamps on varied timers or smart plugs in the evening do more for the impression that someone is home than any single always-on fixture.