How to Improve Home Security With Better Locks

Most burglars do not pick locks like in the movies. They kick a door, pry a weak frame, or slip through a window latch that barely holds. That is actually good news for homeowners, because the fixes are straightforward, affordable, and far more effective than most people expect. Learning how to improve home security with better locks is less about buying the most expensive lock on the shelf and more about strengthening the whole entry point: the lock, the strike plate, the frame, and the door itself.

In this guide, you will learn which deadbolts are actually worth the money, why a 3-inch screw matters more than a fancy keypad, when a smart lock helps and when it does not, and how to secure windows, sliding doors, and garages with the same logic. Expect real numbers: lock grades, bolt lengths, screw sizes, and realistic costs, so you can upgrade one door this weekend and the rest of the house over the following month.

Why Most Break-Ins Succeed (and What Actually Stops Them)

Forced entry through a door usually means one of two failures. Either the door frame splits around the strike plate, or a flimsy latch gives way under a shoulder or a kick. Standard builder-grade hardware makes both easy: the strike plate is often held by two short 3/4-inch screws that bite only into the thin door jamb, not the wall stud behind it. One good kick can tear that jamb apart, no matter how solid the lock cylinder looks from the outside.

That is why layered upgrades beat a single hero product. A strong deadbolt, a reinforced strike, longer screws, and a solid door work as a system. Each piece is cheap on its own — a quality deadbolt runs $30 to $60, a heavy-duty strike kit $15 to $25, and a box of 3-inch screws under $10 — but together they turn a two-second kick into a noisy struggle. Burglars want speed and silence, and anything that denies them both usually sends them elsewhere.

Choosing the Right Deadbolt: Grades, Bolts, and Cylinders

Deadbolts are graded by ANSI/BHMA standards, and the grade tells you how much abuse the lock survived in testing. Grade 1 is the strongest rating, tested to withstand 10 strikes of 75 pounds of force and 250,000 cycles. Grade 2 is a solid residential choice, rated for 5 strikes of 75 pounds and 150,000 cycles. Grade 3 is the minimum residential grade and the one most often installed by builders — it is the grade worth replacing first.

What to Look for on the Box

• Grade 1 or Grade 2 rating. If the box does not state a grade, assume it is Grade 3 and keep shopping.
• A full 1-inch bolt throw. The bolt should extend a full inch into the frame. Shorter throws are easier to pry back.
• A hardened steel bolt with a spinning pin or anti-saw insert. This resists sawing and cutting attacks on the bolt itself.
• A single-cylinder deadbolt for most doors. Key outside, thumb-turn inside. Double-cylinder deadbolts (keyed on both sides) are only appropriate for doors with glass panels nearby, and they can be a fire-safety hazard, so check local codes before installing one.
• Anti-bump and anti-pick pins. Most reputable mid-range deadbolts now include spool or mushroom pins that make picking and bumping substantially harder.

Single Deadbolt vs. Deadbolt Plus Knob Lock

Many exterior doors carry both a keyed knob and a separate deadbolt. Understand the division of labor: the spring latch in a knob lock is not a security device. It can be slipped with a credit card on an improperly fitted door and offers almost no resistance to force. Always lock the deadbolt, even for a ten-minute errand. A door secured only by its knob lock is barely secured at all.

The Upgrade That Matters Most: Strike Plate and Door Frame

If you do only one thing from this article, do this. Remove the two short screws holding your strike plate and replace them with 3-inch wood screws that reach through the jamb and into the wall stud behind it. Then, if your strike plate is the thin, stamped-metal type that came with the door, swap it for a heavy-duty strike box or a reinforced strike plate with four to six screw holes. The whole job takes about fifteen minutes per door with a drill and a screwdriver.

For doors that have already been kicked or show a cracked jamb, a door-frame reinforcement kit is the right fix. These kits typically include a long steel plate along the jamb, a reinforced strike area, and hinge shields, and they cost $70 to $120. Pair the kit with 3-inch screws in every hinge — hinges are the other weak point on a forced door. If your door itself is hollow-core, no lock upgrade will save it; replace it with a solid-core wood or steel door, typically $150 to $400 before installation.

Smart Locks: Convenience, Key Control, and Honest Limitations

Smart locks solve a different problem than stronger hardware: they solve the key problem. No more hiding a spare key under a rock, no more wondering whether the dog walker still has a copy, and no more rekeying when a houseguest leaves. You can issue a temporary code for a cleaner or contractor, set it to expire automatically, and see a log of who unlocked the door and when. For families and rental hosts, that control is genuinely valuable.

What a smart lock does not do is make a door harder to kick in. A keypad deadbolt with a Grade 3 body and a weak strike plate is no more secure than a standard Grade 3 deadbolt. So shop the same way: Grade 1 or 2 rating, 1-inch bolt, solid metal housing, plus the reinforced strike plate above. Expect $120 to $250 for a well-reviewed keypad or fingerprint model, plus batteries every 6 to 12 months, and choose one with a physical key backup.

One more practical note: a smart lock is only as secure as its software habits. Use a unique code for each person rather than one shared family code, disable codes promptly when someone no longer needs access, and enable two-factor authentication on the lock’s app account. A keypad with a code of 1234 protects nothing, however strong the bolt behind it is. If you are weighing a full alarm setup alongside new locks, our guide to best home alarm systems explains how locks, sensors, and monitoring fit together.

Do Not Forget Windows, Sliding Doors, and the Garage

A reinforced front door means little if a ground-floor window opens with a firm push. Most standard window latches are designed to keep a window closed, not to resist entry. Inexpensive secondary locks — pin locks that drill through the sash, or keyed sash locks — cost $5 to $15 per window and make a real difference. For windows you never open, a simple wooden dowel or a sash pin is nearly free and highly effective.

Sliding patio doors deserve special attention because their factory latches are notoriously weak and the doors can sometimes be lifted off their tracks. Add a secondary lock: a security bar in the track ($15 to $30), a foot-operated bolt, or a pin lock through the frame. A track bar alone stops the door from sliding even if the latch is defeated. For the garage, the weak link is often the emergency release cord, which can be hooked from outside with a wire. A simple release shield, which costs under $20, blocks that trick while still letting you pull the release from inside. Also make a habit of locking the interior door between the garage and the house — an attached garage is an entry point, not a security zone.

Key Control: Rekeying, Replacing, and Spare Keys

Every time you move into a new home, rekey the locks before you unpack. You have no idea how many copies of the old keys exist: previous owners, their relatives, cleaners, contractors, and real estate agents may all hold one. Rekeying changes the internal pins so old keys stop working, and a locksmith typically charges $15 to $25 per lock, or $100 to $200 for a whole house. If your existing locks are old, worn, or Grade 3, replace them instead — the extra cost buys stronger hardware at the same time.

Going forward, control copies ruthlessly. Use a locksmith or hardware store that stamps “Do Not Duplicate” on spare keys, though that marking is a request, not a guarantee. Restricted keyways, available on higher-end cylinders, physically prevent unauthorized duplication and suit rental properties well. And retire the outdoor hiding spots: under the mat, in the fake rock, above the door frame. Burglars check those first. For a broader DIY approach to securing every entry point, see our DIY home security guide.

6 Lock Upgrades Worth Doing This Month

3 Mistakes That Undermine Good Locks

Locking only the knob. The deadbolt is the lock; the knob latch is a convenience. A door locked only by its knob is an invitation, not a barrier.

Buying a smart lock and skipping the frame. Electronics do not reinforce wood. A keypad on a weak frame fails exactly like a standard lock on a weak frame.

Ignoring the door nobody uses. Side doors, basement doors, and garage-entry doors are burglar favorites precisely because homeowners forget them. Upgrade every exterior door, not just the photogenic one.

Frequently Asked Questions