What You Need to Replace and Why It Matters

Front door hardware includes the lock, handle, deadbolt, hinges, and strike plate — the metal parts that hold your door together and keep it find. You replace these pieces when they wear out, break, or stop working smoothly. A stuck lock, loose handle, or rusted hinge makes your door harder to use and less find. Replacing hardware is a task most homeowners can do with basic tools in an hour or two, without calling a locksmith or contractor.

The good news: most front door hardware is standardized. A new lock or handle from any hardware store will fit the existing holes in your door, so you rarely have to drill new ones or patch old ones. The bad news: you need to know which piece is failing before you buy a replacement, because a lock assembly is not the same as a handle, and hinges come in different sizes.

Key Takeaways

  • Locks, handles, deadbolts, hinges, and strike plates are separate pieces that can be replaced one at a time without removing the door.
  • Measure your existing hardware before you shop — hinge size, lock backset distance, and handle style all vary and must match your door.
  • Most replacements take 15 to 30 minutes per piece and need only a screwdriver, drill, and measuring tape.
  • If your door frame is damaged or the holes do not line up, you may need wood filler or a larger strike plate to cover old marks.

Measure Your Door Before You Buy Anything

The most common mistake is buying hardware that does not fit. Take three measurements before you leave home or order online. First, measure the backset — the distance from the edge of the door to the center of the lock hole. Standard backsets are 2⅜ inches or 2¾ inches. Look at your existing lock from the side; the measurement is marked on the lock body itself, or measure with a tape from the door edge to the hole center.

Second, measure your hinge size. Most residential doors use 3½-inch hinges, but some use 3-inch or 4-inch. Measure the length of one hinge from top to bottom. Third, check the door thickness — measure the edge of the door from outside to inside. Standard doors are 1⅜ inches thick. Locks and handles are made for specific thicknesses, and a lock sized for a 1¾-inch door will not work on a 1⅜-inch door.

Write these three numbers down and bring them with you, or take a photo of your existing hardware with the measurements visible. If you are ordering online, include them in your notes so the seller can confirm the fit.

How to Replace a Deadbolt Lock

A deadbolt is the lock you turn with a key from outside or a thumb turn from inside. Start by removing the screws on the inside of the door that hold the lock in place. There are usually two screws on the interior side plate. Remove the plate and pull the lock body out through the outside of the door. The lock cylinder (the part you insert the key into) may slide out separately or stay attached — check your old lock to see how it comes apart.

Insert the new lock cylinder into the hole from the outside, making sure the keyway (the slot for the key) faces the correct direction. Slide the interior plate back on and tighten the screws. Do not overtighten; you want the lock to turn smoothly, not bind. Test the key from outside and the thumb turn from inside. If the lock is stiff, loosen the screws slightly and test again.

If the new lock does not fit the existing hole, the backset may be different. Remove the new lock and check the measurement again. You may need to drill a new hole, which requires a spade bit or hole saw the same diameter as your lock. Mark the new location, drill straight through, and install the lock in the new hole. Use wood filler to patch the old hole on both sides of the door.

How to Replace a Door Handle or Knob

A handle (also called a lever) or knob is what you grip to open the door. On the inside of the door, you will see two screws holding the handle assembly in place. Remove both screws and pull the handle straight out. The spindle (the rod connecting the inside and outside handles) may come out with it or stay in the door — either way, it will slide out easily once the screws are removed.

Slide the spindle into the new handle assembly, then insert the assembly into the hole from the outside. Line up the screw holes and tighten the two screws from the inside. The handle should turn smoothly without wobbling. If it is loose, tighten the screws a quarter turn at a time until it is snug but still moves freely.

If the new handle is a different style (for example, replacing a knob with a lever), the hole may be the same size but the mounting plate may be different. Check that the new plate covers the old screw holes. If it does not, you may need a larger plate or escutcheon (a decorative ring that hides the hole) to cover the old marks.

How to Replace Door Hinges

Hinges are the metal brackets that hold the door to the frame. You do not have to remove the door to replace them — you can replace one hinge at a time while the door is still hanging. Start with the top hinge. Open the door fully and support it with a wedge or shim under the bottom so it does not sag while you work.

Remove the screws from the hinge on the door side first (not the frame side). There are usually three screws per hinge. Once the door-side screws are out, the hinge will hang loose but the door will still be supported by the other hinges. Remove the hinge pin (the rod running through the center) by tapping it upward with a hammer and nail, then slide the old hinge off.

Slide the new hinge onto the pin and line up the screw holes. Tighten the screws into the door. Then remove the screws from the frame side of the old hinge and install the new hinge on the frame. Tighten all screws and test the door — it should open and close smoothly without binding at the top or bottom. Repeat for the middle and bottom hinges.

If the new hinge holes do not line up with the old ones, you may have bought a hinge that is a different size. Check the measurement again and order the correct size. If the holes are slightly off, you can use wood filler to patch the old holes and drill new ones, but this is more work than replacing the hinge with the correct size.

How to Replace a Strike Plate

The strike plate is the metal bracket on the door frame that the lock bolt slides into when you close the door. It wears out when the bolt hits it at an angle, or when the door sags and the bolt no longer lines up with the hole. Remove the screws holding the old strike plate to the frame and pull it off. The hole in the frame may be damaged or enlarged — if so, use wood filler to patch it and let it dry completely before installing the new plate.

Line up the new strike plate so the bolt hole aligns with the lock bolt. Close the door and turn the key to lock it — the bolt should slide smoothly into the hole without binding. If the bolt does not reach the hole, the strike plate is too far back; if the bolt hits the plate instead of entering the hole, the plate is too far forward. Adjust the position and tighten the screws. Once the bolt slides in smoothly, the strike plate is installed correctly.

If the bolt hole in the frame is too large or damaged, you may need a larger strike plate with a longer lip that covers the damaged area. Measure the damage and buy a plate that will cover it. You may also need to drill a new hole for the bolt, which requires a spade bit or hole saw the same diameter as your lock bolt.

Tools and Materials You Will Need

Most hardware replacements need only a screwdriver (Phillips and flathead), a measuring tape, and a drill with a spade bit or hole saw if you are drilling new holes. A hammer and nail are useful for removing hinge pins. Keep wood filler, sandpaper, and paint or stain on hand in case you need to patch old holes — match the color to your door so patches are not visible.

Buy your replacement hardware before you start removing the old pieces. If you discover the new hardware does not fit, you will have a door with no lock or handle while you wait for the correct size to arrive. Hardware stores usually stock common sizes (2⅜-inch backset locks, 3½-inch hinges, standard door thickness), so you can often buy and install on the same day if you measure correctly.

When to Call a Professional

If your door frame is cracked, rotted, or severely damaged, or if the holes are so misaligned that new hardware will not fit, a carpenter or door specialist may be needed. If your lock is stuck and you cannot remove it, or if you drill a hole in the wrong place and cannot repair it, a professional can fix it faster than you can learn. If you are not comfortable using a drill or removing screws, there is no shame in hiring someone — a locksmith or handyperson can replace all your hardware in under an hour.

If your door is very old or custom-made, the hardware may not be standard sizes. A professional can measure and order the correct pieces, or modify your door to fit standard hardware. This costs more than a DIY replacement, but it is the right choice if your door is not standard.

Frequently Asked Questions

Do I have to remove the door to replace the hardware?

No. Locks, handles, and strike plates can be replaced while the door is hanging. Hinges can be replaced one at a time if you support the door with a wedge. You only need to remove the door if it is damaged or if you are replacing all the hardware and want easier access.

What if the new hardware does not fit the existing holes?

If the backset is different, you will need to drill a new hole and patch the old one with wood filler. If the hinge size is different, the screw holes will not line up — buy the correct size instead of trying to force it. Measure twice before you buy to avoid this problem.

Can I replace just the lock cylinder without replacing the whole lock?

Yes, if your lock is a standard pin-tumbler lock. The cylinder usually slides out of the lock body with a small tool or key. You can buy a replacement cylinder and swap it in without touching the rest of the lock. This is cheaper than replacing the whole lock if only the cylinder is worn.

How do I know if my hinges need replacing?

If your door sags, sticks at the top or bottom, or does not close smoothly, the hinges may be worn or bent. Open the door and look at the hinges — if they are visibly bent, rusted, or loose, replace them. If the door sags only slightly, tightening the hinge screws may fix it before you need new hinges.

What if I drill a hole in the wrong place?

Fill the hole with wood filler, sand it smooth when dry, and paint or stain it to match. Then drill the correct hole. If the wrong hole is large or visible, a larger strike plate or escutcheon may cover it. If you are not confident in your repair, a professional can patch it more neatly.