Home security basics

Most residential break-ins happen through the front door, back door, or first-floor windows, and most happen fast. The goal of door and window hardening is to slow entry long enough that a burglar moves on rather than forces through. A determined intruder with tools and time can defeat almost any residential hardware; the realistic objective is to make your home more work than the next one.

• Deadbolt grade: Deadbolts are rated ANSI Grade 1 (best), Grade 2, or Grade 3 (worst). Most builder-installed deadbolts are Grade 2 or Grade 3. A Grade 1 deadbolt is available at a hardware store and is dramatically harder to defeat. The ANSI grade is printed on the package. Look for Grade 1 on every exterior door that has a deadbolt. A Grade 3 deadbolt on a solid core door is a weaker link than it appears.
• Door frame reinforcement, the overlooked priority: The most common way a door is kicked in is not by breaking the lock; it is by splitting the door frame at the strike plate. The wood around a standard strike plate is typically held in place by 3/4-inch screws. When kicked, the frame splits and the strike plate pulls free. The fix: replace the standard strike plate with a reinforced heavy-gauge steel strike plate secured with four 3-inch screws reaching into the door frame stud behind the trim. This upgrade is inexpensive and is among the highest-return security improvements available for most residential doors.
• Door quality: A solid core door (wood or steel) is substantially harder to breach than a hollow core door. Many interior doors are hollow core; many back doors and side doors are as well. A hollow core door can be punched through with a fist. If an entry door flexes or feels light when you knock on it, it is likely hollow core. A solid side or back door installed typically costs $300 to $1,000 (HomeGuide).
• Sliding glass doors: A sliding door can be lifted off its track from outside if the track allows it, and the built-in latches on most sliding doors are low quality. Two improvements: place a cut-down wooden dowel or adjustable security bar in the lower track to prevent the door from being slid open even if the latch is defeated; and add anti-lift pins or a security bar that prevents the door from being lifted off the track. Both are inexpensive items available at any hardware store.
• Window locks and pins: Standard window sash locks can be defeated from outside. For double-hung windows, drill a downward-angled hole through the inner sash and partially into the outer sash, then insert a removable pin or nail. The window can be opened to the pin stop for ventilation but cannot be opened fully from outside. For sliding windows, the same track-bar approach used on sliding doors applies. First-floor windows accessible from outside are the priority; second-floor windows require a ladder and are a lower risk.
• Door viewer and visibility: If you cannot see who is at the door without opening it, install a wide-angle door viewer (peephole). For homes without a sidelight, this is the minimum. A video doorbell provides a camera record in addition to the visual. Both are low-cost improvements. A solid door without a viewer or camera means that answering requires opening, which is worse than either option.

Key management is the most underestimated part of residential security. The quality of your deadbolt matters far less than knowing exactly who has a working key to your home.

• Rekey when you move in: When you move into a home you did not have built, you do not know how many copies of the existing key exist or where they are. Previous owners, prior tenants, real estate agents, house cleaners, contractors, family members, and neighbors may all have a copy. Rekeying changes the key without replacing the lock hardware; a locksmith usually charges a service call fee plus a per-lock fee (HomeGuide: $50 to $150 service call). It is quick and eliminates an entire category of access risk. Do this before moving your first box in.
• Restricted keyways: Standard residential keys can be duplicated at any hardware store in minutes for a few dollars. A restricted keyway key is a patented key design that can only be duplicated by an authorized locksmith with proof of ownership. If you need to give key copies to contractors, family, or house sitters while maintaining control over duplication, a restricted keyway system costs more than a standard lock and eliminates the hardware-store duplication problem. Popular options include Medeco, Schlage Primus, and Mul-T-Lock.
• Smart locks, what they actually offer: A smart lock replaces or augments the physical cylinder with electronic access. The core advantages are: individual access codes (so you know which code opened the door and when), the ability to grant and revoke access remotely, and no key to copy or lose. Most smart locks also retain a physical key cylinder as a backup. For homes that need to manage multiple people with legitimate access (contractors, house cleaners, dog walkers, family members), a smart lock with per-person codes is operationally superior to physical key management.
• Contractor vs permanent access codes: Use temporary codes for contractors and service providers. Most smart locks allow you to set a code that expires automatically after a specific date and time. Give the electrician a code valid for the day they are working; delete it automatically when the job ends. This means you never have to chase down a key or wonder whether someone who has your code still has access. Never give a contractor your permanent household code.
• Smart lock vulnerabilities: Smart locks introduce a Wi-Fi or Bluetooth component that is not present in a keyed deadbolt. Known risks include: weak PINs (do not use 0000, 1234, or your address number), replay attacks on some Bluetooth locks (largely patched in current products), and dead batteries (always keep a battery backup or emergency key available). A smart lock with a 4-digit PIN that has not been changed since installation is not materially more secure than a physical key. The security improvement comes from code management discipline, not from the device itself.
• Key storage outside the home: A lockbox or key safe installed at a non-obvious exterior location is more secure than a spare key under the mat, above the door frame, in a fake rock, or in a decorative item near the entrance. These hiding spots are the first places a burglar checks because everyone uses them. A combination lockbox bolted to the hose bib, foundation, or deck post is a reasonable solution for emergency access. Use a 4-6 digit combination that is not your address or birth year.

Understanding how residential theft actually happens (what is targeted, where access is gained, and how fast it occurs) shapes every other security decision more effectively than general advice. Most residential burglaries are opportunistic and take under 10 minutes. The burglar is looking for easy access, low visibility, and fast payoff. Understanding the specific patterns lets you address actual risks rather than theoretical ones.

• Garage door code theft: Older garage door openers (pre-2005 approximately) use fixed radio codes that can be captured and replayed. Any rolling-code opener (sold since the mid-1990s as a standard feature) generates a new code on every use and cannot be replayed. If your opener is old enough to use fixed codes and you have concerns, replace the motor unit with a rolling-code model. The more common modern risk is the garage door keypad: a four-digit PIN that has never been changed since the door was installed is a low-quality access control. Change the default PIN when you move in and use a non-obvious combination.
• Porch package theft: Package theft is the most common property crime in many residential neighborhoods. The pattern is simple: a person watches a delivery and returns within hours. Effective countermeasures: a video doorbell or front-facing camera with a visible enclosure (the camera housing alone deters a percentage of attempts), a package lockbox or delivery cage bolted to the porch, delivery instructions that direct packages to a side door or neighbor, or a carrier hold or locker pickup for high-value deliveries. Amazon and UPS offer photo-on-delivery and geofenced delivery confirmation that provides documentation if a package is stolen after confirmed delivery.
• Car break-ins in driveways and on streets: A car in a residential driveway or on a street is a far softer target than a home. The most common car break-in pattern is simple: a person walks down the street at night, pulling door handles. Unlocked cars are entered and rifled. Locked cars with visible valuables (bags, charging cables, electronics, even visible center console contents) are broken into. The countermeasure is simple: never leave anything visible in a parked car, always lock it, and do not leave a garage door opener visible in the car; a garage door opener in a car with a registration document is a key to your house with your address attached.
• Side gates as entry points: The side gate is the most commonly overlooked access point in residential security. A gate that can be reached over the top to unlatch from outside, or that is not locked at all, provides access to the back yard from the street with minimal visibility. Back yard access means: back door approach (often less hardened than the front door), access to sliding glass doors, and cover from street and neighbor sightlines while working on the back of the house. A padlock on the side gate and a deadbolt on any back door are the minimum. A motion light covering the back approach and any gate approach adds visibility.
• Catalytic converter theft: Catalytic converter theft is a significant and fast-growing category. Certain vehicles are disproportionately targeted based on converter accessibility and metal value: Toyota Prius (hybrid converter has higher precious metal content), Honda Element, SUVs and trucks with high ground clearance (easy access without a jack), and older Priuses (2004-2009 most targeted). A thief with a battery-powered reciprocating saw can remove a converter in 30-60 seconds. Countermeasures: a catalytic converter shield (steel cage or plate welded or bolted over the converter, installed by a shop), parking in a well-lit area or garage when possible, and a video camera covering the driveway approach. Contact your insurance carrier; converter theft may be covered under comprehensive.
• The occupied vs unoccupied signal: Burglars distinguish occupied homes from unoccupied homes before attempting entry. Indicators of vacancy: mail and packages accumulating, no interior lights in the evening, curtains in fixed position over multiple days, no vehicle movement, trash cans left at the curb after collection day. Indicators of occupancy: interior lights on in the evening, movement visible through windows, a vehicle that comes and goes, trash cans returned promptly, and mail that disappears. Managing these visible signals during absences (mail hold, smart plug timers, a neighbor who moves the trash can) materially reduces the likelihood that a home is selected for a break-in attempt.