How to Install a Deadbolt Lock | The Right Way, Step by Step

A deadbolt lock installs in about an hour with a drill, a hole saw, and careful alignment of the latch and strike plate for solid security.

Bolt placement marks the first decision: you want that lock roughly 6 to 12 inches above the doorknob. Get that height right, and the rest is a clean sequence of drilling, chiseling, and assembling the cylinder. The steps are the same whether you are replacing an old lock or cutting into a new door, and the difference between a lock that works and one that binds or cracks your door face comes down to two things: drilling from both sides of the door and anchoring the strike plate with the full-length screws. Here is exactly how to get it right on the first try.

What You Need Before You Drill

Deadbolt installation needs a specific set of tools and measurements—skipping the prep is where most mistakes start. Measure the backset (distance from the door edge to the hole center) before anything else. Most US residential deadbolts use either a 2-3/8-inch or 2-3/4-inch backset; the manufacturer’s paper template will tell you which yours requires, and drilling at the wrong distance means the latch won’t reach.

Tools and Materials Checklist

• Deadbolt lock kit with all mounting screws
• 2-1/8-inch hole saw (for the main cylinder hole)
• 1-inch drill bit (for the latch shaft hole)
• Drill with enough torque for wood or steel doors
• Pencil and tape for template placement
• Chisel and hammer (for mortising the faceplate)
• 2-½ to 3-inch screws for the strike plate (kit screws are often too short)
• Safety glasses and a dust mask

How to Install a Deadbolt Lock: The 9-Step Sequence

The order matters. Mark the door first, then drill the holes, fit the latch, assemble the cylinder, and finish with the strike plate. Work through each step completely before starting the next.

Step 1: Mark the Placement

Measure 6 to 12 inches above the doorknob on the door edge and draw a horizontal line across both the door face and the jamb. Mark the backset distance from the door edge onto the face of the door. A level here keeps the lock straight—eyeballing it leads to a crooked cylinder.

Step 2: Tape and Align the Template

Fold the manufacturer’s paper template along the door edge and tape it so the edge markers line up with your backset mark. Fold it over the top of the door, not the side—common mistake that shifts the hole location.

Step 3: Drill the Main Hole (Both Sides)

Fit the 2-1/8-inch hole saw into the drill. Drill from the exterior side about three-quarters of the way through until the pilot bit pokes out the interior side. Stop, move inside, and finish the hole from the interior side. This is the single most important anti-splinter trick; drilling all the way through from one side will shred the wood on the exit face.

Step 4: Drill the Latch Hole

Switch to the 1-inch bit. Drill straight into the door edge, aiming for the center of the main hole you just cut. The two holes should meet cleanly. Blow or vacuum out the sawdust before inserting the latch.

Step 5: Install and Mortise the Latch

Insert the latch bolt into the 1-inch edge hole with the beveled side facing the door frame. Trace the faceplate with a pencil, remove the latch, and chisel a 1/8-inch-deep recess along the trace so the faceplate sits flush with the door edge. Tap the chisel marks at the outline first—that prevents splintering into the door face. Secure the faceplate with the included screws.

Step 6: Assemble the Cylinder

Insert the exterior deadbolt cylinder into the main hole. The torque blade (the flat metal “tongue” at the back of the cylinder) must slide vertically into the slot on the latch mechanism. If it goes in sideways, the thumb turn will jam. Rotate the blade until it aligns.

Step 7: Secure the Mounting Plate

Slide the interior rosette and the turn piece onto the torque blade from the inside. Thread the machine screws through the mounting plate and into the back of the exterior cylinder. Tighten evenly—do not over-tighten or the cylinder may warp, making the key hard to turn.

Step 8: Install the Strike Plate

Close the door and mark where the bolt contacts the jamb. Drill a 1-inch-deep hole (or the depth your kit specifies) into the jamb at the mark. Chisel a 1/8-inch recess for the strike plate. Secure the strike plate with 2-½ to 3-inch screws that bite into the door frame stud—the short screws in most kits only hold the trim, not the lock. Some kits include a dust box that fits into the jamb hole first; install that before the strike plate if yours has one. Readers ready for the next level of convenience can browse tested options at our auto deadbolt lock roundup.

Step 9: Test the Bolt Action

Turn the thumb piece and use the key. The bolt should extend fully and retract smoothly. If it sticks, loosen the strike plate screws slightly and shift the plate by a millimeter or two, then retighten. A thin dab of lubricant on the bolt helps if it feels stiff.

Common Mistakes That Ruin a Deadbolt Install

Most problems trace back to four errors, and they are all avoidable with the right drill sequence and screw choice. A single-cylinder lock works fine for most doors; for electronic deadbolts like keypad models, you will need to route the interior cable over the bolt and secure the batteries inside the unit without pinching the wires. Schlage’s official documentation covers that extra step well if your model has one.

A deadbolt that sticks after install is almost always a strike plate alignment issue—small adjustments fix it. Steel doors behave the same way but may need a pilot bit to stop the drill bit from wandering off the mark.

Finishing Checklist: What a Properly Installed Deadbolt Looks Like

• The cylinder sits flush against the door face with no gap
• The faceplate is mortised 1/8 inch deep, flush with the door edge
• Strike plate screws are 2-½ to 3 inches long, anchored in the frame
• The bolt extends fully without scraping or resistance
• The key and thumb turn operate smoothly in both directions

Once the lock passes that five-point check, the install is done. Single-cylinder locks follow this sequence exactly; double-cylinder or keypad models add cable routing steps that the manufacturer’s manual covers. If your door is thicker than standard (over 1-7/8 inches), confirm that the included cylinder bolts are long enough to reach the mounting plate—hardware stores carry extension kits for thick doors.

For homeowners replacing an existing lock, the same steps apply: remove the old hardware, drill new holes only if the backset changed, and follow the same mortise-and-screw procedure. A fresh deadbolt installed with long frame screws is the single strongest security upgrade most doors can take.