Home Self-Reliance Skills Protect Locks & Hardware Repair

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L1 Household Basic L2 Capable Homeowner

Locks & Hardware Repair

A good lock only works on a door that closes, latches, and holds.

The deadbolt check, reinforced strikes, sticky locks, door sweeps, rekeying, and deadbolt replacement. The hands-on repairs that make a lock do its job, most of them with a screwdriver and an hour.

Start with the deadbolt check When to call a professional

By Dan Whelan, founder of New World Survival

Researched from government agencies, university extension services, and other published sources. See our sources

Why this skill matters

Why does door hardware matter more than the lock itself?

A deadbolt holds only as well as the screws behind its strike plate. On many doors those screws stop in the thin wooden jamb and never reach the wall framing behind it. The door security guide explains why that matters, and Door & Window Repair shows the basic screw upgrade. This page covers the lock itself.

The same small hardware decides how a door behaves every day. A latch that misses the strike, a door that sags and rubs, or a key that sticks in the cylinder are all repairs most households can make in under an hour.

The preparedness side follows from the everyday one. After a storm swells a frame, after a move into a house whose old keys are still out there, or after a break-in attempt, a household that can adjust, rekey, and reinforce its own doors is secure again the same day.

What you should be able to do

L1 Household Basic

Check that every exterior deadbolt throws fully with the door closed

Tell a lock problem from an alignment problem, and route each to the right fix

Confirm strike plate screws reach the framing behind the jamb

Free a sticky lock and tighten a loose knob or lever

Replace a worn door sweep

L2 Capable Homeowner

Install a reinforced strike plate or strike box

Rekey a lock, and replace a deadbolt in existing bore holes

Know when the problem is the frame, not the hardware, and stop

Tools and supplies

What tools do you need for door hardware repair?

What you need to start

Screwdrivers. A #2 Phillips and a medium flat blade cover nearly every residential lock and hinge.

Cordless drill and driver. For pilot holes and long screws. Driving 3-inch screws by hand is possible but slow. See the power tools guide if this is your first drill.

3-inch wood screws. A small box, $5 to $10. Match the head size to the holes in your strike plate and hinges.

Safety glasses. Drilling into a door frame throws chips at eye level.

Marker or lipstick, and a flashlight. For finding exactly where a latch hits the strike.

What you'll want as you go deeper

A reinforced strike plate or strike box, $10 to $30

Wood chisel and hammer, for deepening a strike mortise

Rekey kit matched to your lock brand

Replacement door sweep sized to your door's width and bottom profile

The lock lubricant your lock's maker specifies

Common problems and causes

Why won't my door latch or lock properly?

The latch hits the strike plate instead of catching

The latch and the hole in the strike no longer line up. Look at the scratch marks on the strike: marks above the hole mean the door sits high or the strike sits low, and marks below mean the opposite. Usually a hinge or strike adjustment fixes it, covered on Door & Window Repair.

The deadbolt only throws if you push or lift the door

The bolt is rubbing the edge of the strike opening. A deadbolt that does not extend fully may not be locked at all. Same diagnosis as a missed latch, often with the same fix.

The door rubs at the top corner on the latch side

The classic sagging door. The top hinge screws have loosened in their holes, so the door tips toward the latch side. Tightening or lengthening the top hinge screws usually pulls it back. The repair is on Door & Window Repair.

The key goes in hard or turns stiffly

Dirt and wear inside the cylinder, a worn key, or a bolt dragging on the strike. Try the spare key first. If the lock turns freely with the door open but not closed, the problem is alignment, not the lock.

The knob or lever wobbles

The through-bolts that hold the two halves of the lockset together have backed out. Most locksets tighten from the inside face.

Light and drafts under the door

A worn or torn door sweep. It is a five-minute replacement, and it also keeps out insects and blowing rain.

Level 1 and Level 2 repairs

How do you fix and reinforce door hardware, step by step?

Five repairs, starting with a ten-minute check that tells you which of the others a door needs. Alignment and the basic screw upgrade live on the Door & Window Repair page. This page picks up from there.

The deadbolt check

Ten minutes per door. It tells you whether the lock is doing its job and which repair to do next.

Alignment and screw upgrades: the chalk test, strike adjustment, 3-inch screw upgrade, and sagging-door fix are taught step by step on Door & Window Repair.

1Close the door without pushing on it. Turn the thumbturn. The bolt should extend fully, with no push, lift, or extra force.

2Open the door and throw the bolt in the open air. Compare how far it extends. If it travels farther open than closed, it is hitting the strike and is not fully locked.

3Back out one strike plate screw and measure it. Under 3 inches means the strike is held by the jamb alone.

4If the bolt binds or the screws are short, do the alignment and screw repairs on Door & Window Repair. Then consider the reinforced strike below.

Install a reinforced strike

A heavier strike plate or a strike box spreads force across more of the jamb and adds more long screws into the framing. About an hour, $10 to $30. The locks handbook compares the types.

1Remove the old strike. Hold the new one over the mortise, centered on the bolt hole, and trace its outline and any new screw holes with a sharp pencil.

2Score the outline with a utility knife, then chisel the mortise wider or deeper in shallow passes until the new strike sits flush with the jamb. A strike that stands proud keeps the door from closing.

3If the kit includes a box that sits inside the bolt hole, drill or chisel the hole to fit it. Wear safety glasses.

4Drill pilot holes and drive the long screws supplied with the kit, or 3-inch screws, until snug. Overtightening pulls the jamb and throws the bolt out of line.

5Run the deadbolt check again. The bolt should throw fully with the door closed.

Sticky locks, loose knobs, and door sweeps

Three small repairs that make a door pleasant to use again. Together they take about 30 minutes.

Sticky lock

1Test with the door open. If the key turns freely now, the lock is fine and the door needs Task 2. If it is still stiff, the cylinder needs care.

2Use the lubricant your lock's maker specifies, applied the way its care instructions describe. Work the key in and out several times. If a worn key is the problem, cut a new one from the spare, not from the worn copy.

Loose knob or lever

3Find the two through-bolts on the inside face of the lockset. Tighten them alternately, a little at a time, until the knob is firm. Overtightening can make the latch stick, so stop at firm.

Door sweep

4Measure the door's width and note how the old sweep attaches: screwed to the face, or slid into a slot on the bottom edge. Buy the matching type.

5Remove the old sweep, cut the new one to width, and install it so it just touches the threshold. Check that the door still closes without dragging.

Rekey a lock

Rekeying changes which key opens the lock without replacing the hardware. It is the right first step after moving into a house, losing a key, or a household change.

Two kinds of locks: some brands rekey with a working key and a small tool in minutes. Others need the cylinder taken apart and new pins fitted. The brand's kit instructions tell you which you have.

1Identify the brand and model of every exterior lock. Rekeying to one shared key is easiest when the locks are the same brand.

2Buy the rekey kit made for that brand. Read the full instructions before taking anything apart, and work over a towel so small pins cannot roll away.

3Follow the kit's steps for your lock type. Test the new key several times with the door open before closing it.

4If a cylinder will not come apart as the instructions show, or pins are lost, stop and take the cylinder to a locksmith. Rekeying a loose cylinder at the counter is a routine job for them.

Replace or install a deadbolt

Swapping a deadbolt into existing holes takes about 30 minutes. Boring new holes in a door is a larger job. Use the manufacturer's paper template and a hole saw kit, or have a locksmith do it.

Choosing the lock: the locks and door reinforcement handbook explains grades and what to buy.

1Before buying, measure the backset (door edge to the center of the bore hole) and the door thickness. Buy a deadbolt that fits both.

2Remove the old deadbolt: two screws on the inside, then the bolt plate on the door edge.

3Install the new bolt in the edge hole first, with the side marked "up" facing up. Then fit the outside cylinder and inside thumbturn so the tailpiece passes through the bolt.

4Tighten the through-bolts, then install the new strike plate with screws long enough to reach the framing, as in Task 2.

5Test the thumbturn and the key, with the door open and then closed. The bolt should throw fully both ways.

Emergency and disruption application

When do these repairs matter most?

After a storm swells the frame

Humidity and wind-driven rain can swell a wood door and jamb until the latch no longer catches. Tighten the hinges first. Hold off on planing a swollen door until it has dried out, or it may not close tightly once it shrinks back.

After a break-in attempt

A kicked door often splits the jamb at the strike. If the jamb is cracked but the door still closes, a reinforced strike driven into solid framing can hold it short term. A split jamb still needs a carpenter. If a burglary did happen, what to do after a break-in covers the report, the claim, and what to fix first.

Your fire escape plan

Ready.gov's escape planning guidance asks households to make sure windows are not stuck and security bars can be opened, so every way out works in a fire. A deadbolt that needs a key on the inside raises the same question for a door. If you have one, read the door security guide before keeping it.

Know your limits

When to call a locksmith or carpenter.

Hardware is homeowner territory. The frame, the door itself, and specialty locks often are not. Stop and call when any of these apply.

The jamb is split, rotted, or pulling away

Longer screws cannot hold in damaged wood. A carpenter can replace the jamb section or the whole frame. Rot around an exterior door often means a water problem that needs fixing too.

Doors that suddenly stop closing across the house

Several doors binding at once, new cracks over door frames, or sloping floors point to settling, not hardware. See Know When to Stop on structural concerns.

Mortise, high-security, or commercial-grade locks

These use different internals than standard residential locksets. Rekeying or repairing them is locksmith work.

Smart locks wired into an alarm system

Battery smart locks install like a standard deadbolt. Locks tied into an alarm panel or a home's wiring belong to the alarm installer.

You are locked out

Call a licensed locksmith. Drilling or prying a lock to get in usually costs more to repair than the service call.

You rent

Locks usually belong to the landlord, and many leases require permission before you change or rekey them. Check yours first. See the renters guide.

Practice project

Upgrade one door this weekend.

Time: about an hour. Cost: $5 to $25. Outcome: your most-used exterior door latches cleanly, locks fully, and has its strike held by the framing, not just the jamb.

Pick the exterior door you use most. Open and close it five times and note anything that rubs, sticks, or needs a push to lock.

Tighten every hinge screw and both lockset through-bolts. Retest.

Run the deadbolt check. If the screws are short or the bolt binds, do the strike and hinge repairs on Door & Window Repair.

Throw the deadbolt with the door closed. It should go all the way with no push. Write the date and what you did in your maintenance log.

Then the rest of the house: back door, garage-to-house door, and any side door. The door you forget is the one that matters.

Recommended resources

Books, resources, and the credential.

Books

The Complete Book of Locks and Locksmithing by Bill Phillips. The standard reference on how residential locks work inside, including rekeying and pinning.

The Complete Photo Guide to Home Repair (Black & Decker). Clear photo sequences for door adjustment, hinge repair, and lockset replacement.

On this site

Door security: why frames fail before locks do, and which upgrades matter.

Locks and door reinforcement handbook: lock grades, strike hardware, and what to buy.

Window security: the other openings in the house.

The credential

No credential is required for homeowner door and lock repair. Professional locksmiths are licensed in some states and not others. The Associated Locksmiths of America runs certification programs, and asking a locksmith about licensing and certification before hiring is reasonable.

Door & Window Repair

Sticking doors, planing, thresholds, and window sash repair.

Weatherization

Weatherstripping and sealing that finish the job a door sweep starts.

Home Security

The full guide: layers, lighting, habits, and alarms.

All Protect Skills

Painting, weatherization, gutters, pests, locks, and screens.

Sources

Where this page's safety guidance comes from

The fire escape guidance on this page was checked against the source below on October 6, 2026. Repair steps are standard trade practice. Costs are working estimates.

Ready.gov. "Home Fires" (escape planning: windows not stuck, screens removable, security bars able to be opened). ready.gov