Hanging a door yourself is one of the more satisfying weekend jobs, and it saves the $100 to $300 in labor a carpenter charges to set a single interior door. Get it right and the slab sits plumb, closes with a soft click, and seals the room. Get it wrong and it drags, swings open on its own, or lets a draft through.
Most of the work is patience, not muscle. This guide covers three ways to hang a door, an interior slab in a new frame, a replacement slab in an existing frame, and a prehung unit. You also get the reveal gaps and shim tricks that separate a clean job from a sloppy one.
Key Takeaways
- Aim for a 1/8-inch reveal: the gap between the door and the jamb should measure an even 1/8 inch across the top and the latch side.
- Shim the hinge side first: plumb and screw the hinge-side jamb before you touch the latch side, so the door hangs true.
- Leave a 1/2 to 3/4-inch gap at the floor: that clearance covers carpet, rugs, and return airflow for a central HVAC system.
- Mortise hinges into the slab first: seat the hinge leaves flush on the flat door before lifting it into the frame.
How Hard Is It to Hang Doors?
Hanging an interior door might look intimidating, but it is a manageable project. With a bit of patience, even a beginner can pull it off. It might take a full day to get your first one right, but you can work on speed once you master the technique.
The secret to success is working methodically. Don’t rush the measurements, and continually check that the door is level.
How to Hang a Door Yourself
Hanging interior and exterior doors is a skill that saves you money and solves drafty room issues. Before you start swinging hammers, you need the right setup.
What You’ll Need
- Spirit level (2-foot and 4-foot).
- Assorted drill bits.
- Drill/Driver.
- Speed square.
- Hammer or mallet.
- Circular saw or handsaw.
- Tape measure.
- Utility knife.
- 3-inch wood screws.
- Pry bar.
- Wood shims.
- Pencil.
- Low-expansion foam.
Which Way Should the Door Swing?
Decide the door’s handing before you cut a single hinge mortise, because it sets which jamb carries the hinges. Stand in the opening with your back against the hinge-side jamb. If the knob would land on your right, it is a right-hand door; on your left, it is a left-hand door. Choose the swing that clears furniture, tucks flat against a wall when open, and doesn’t cover a light switch or collide with another door.
Option 1: In a New Frame (Rough Opening)
1. Shim the Hinge Side First
A shim is a thin, tapered piece of wood used to adjust the door frame until it is perfectly square. Most standard rough openings allow for about half an inch of shimming on either side.
Measure the width of the rough opening to see how much shim space you have. Mark the hinge locations on the drywall, then place shims at the top and bottom hinge locations.
Most internal doors have hinges set seven inches from the top and eleven inches from the bottom.
Next, add center shims. Use your long spirit level to ensure these shims create a perfectly plumb line. It is easier to shim the hinge side of the rough opening before inserting the jamb. When you fit the frame, you simply nail the hinge side to these pre-set shims.
2. Check Floor Clearance
Your door needs to clear rugs, carpets, and uneven floors. If you are installing over a bare subfloor, account for the thickness of the flooring you plan to add later.
A gap of 1/2 to 3/4 inch between the bottom of the slab and the finished floor is the standard target. That clearance rides over low-pile carpet and pad, and it lets return air flow back to a central HVAC system when the door is shut. Fire-rated doors have a hard ceiling here: code caps the undercut at 3/4 inch.
3. Set the Jamb Height
Use 1/2-inch thick scraps of wood to rest under the side jambs. This raises the frame off the rough opening and prevents moisture wicking or awkward trimming later.
4. Check the Wall Plumb
Place your spirit level against the drywall to check if the wall itself is vertical. If it is leaning, you might need to adjust how the jamb sits. If the framing is slightly off, use a heavy hammer and a scrap block of wood to nudge the studs.
Recheck with the level. Do this on both sides of the door opening.
5. Fit the Frame
Screw the hinge-side jamb to the door stud first. Drive screws through the frame directly into the shims you placed earlier. Ensure the frame is still balanced on your spacing blocks to maintain ground clearance.
6. Shim the Latch Side
Now move to the latch side. Insert shims at the top, middle, and bottom. You want the gap between the jambs to be consistent from top to bottom. Drive two finish nails into each shim location to secure the frame.
Use a utility knife to score and snap off the excess shim wood so it sits flush with the drywall.
7. Level the Head Jamb
Lay a level across the top head jamb. If it isn’t level, shim the low side until the bubble is centered. This ensures your door creates a nice, even reveal (gap) at the top when closed.
8. Cut the Hinge Mortise
If your jambs aren’t pre-mortised, you need to cut slots for the hinges. Trace the hinge plate onto the jamb. Use a utility knife to score the edges, then use a sharp chisel to remove the wood to the depth of the hinge plate.
Drill pilot holes to prevent splitting the wood, then screw the hinges into the jamb.
Move to the door slab. Hold the door in the frame using wedges to lift it to the correct height. Mark the hinge locations on the door to match the frame. Remove the door, cut the mortises on the door slab, and attach the hinge leaves.
9. Hang and Test
Lift the door into place and interlock the hinge knuckles. Drop the pins in. Check that the door swings freely and doesn’t ghost (swing open or closed on its own).
10. Attach Hardware
Use a template to drill holes for the lockset if the door isn’t pre-bored. A kit like the DEWALT Door Lock Installation Kit makes this foolproof.
Insert the latch mechanism, secure the handles, and install the strike plate on the jamb. Test the latch to ensure it clicks shut without forcing it.
Option 2: In an Existing Frame (Slab Replacement)
Fitting a slab door into an existing frame is easier because the rough work is already done. You don’t need to mess with the frame or shims; you just need to match the new door to the old one.
1. Measure the Old Door
Don’t measure the opening; measure the old door you just took off. Copy down the precise height and width. Most exterior doors are 80 inches tall and 36 inches wide, but older homes vary wildly.
2. Check the Frame for Square
Use a speed square to check the top corners of the existing frame. If the frame is racked (out of square), you will need to trim the new door to match the angle, or it won’t close.
3. Trim the New Door
Your new door should be about 1/8 inch smaller than the opening on the top and sides. If you bought a stock door, you might need to trim it. Use a circular saw with a straight-edge guide to cut it to size.
4. Transfer Hinge Locations
Lay the old door on top of the new door (clamp them together if possible). This is the pro trick. Use a square to transfer the exact hinge locations from the old door to the new one. This ensures perfectly aligned hinges without measuring tapes.
Top Tip
When transferring marks, ensure the top of both doors are perfectly flush. Any variance here will cause the door to hit the jamb.
5. Cut Mortises and Drill
Trace your hinge plates at the marked locations. Score with a knife and chisel out the waste wood. Pre-drill your screw holes to ensure the wood doesn’t split, especially on hollow-core doors which have solid wood only on the edges.
6. Hang the Door
Lift the door into the opening. Screw the hinges into the existing spots on the frame. If the old screw holes are stripped, fill them with wood glue and toothpicks (or a dowel) before driving in new screws.
7. Install Lockset
Mark the handle location using the old door as a guide. Drill your holes, install the latch, and screw on the faceplates.
Option 3: Hanging a Pre-Hung Door
Pre-hung doors come mounted in their own frame with hinges already attached. This is the most common route for renovations because it saves time and eliminates alignment headaches.
1. Check the Floor Level
Place a long level across the floor where the door will sit. If the floor isn’t level, the side of the door frame on the “high” side of the floor needs to be trimmed. If you don’t do this, the top of the door frame will be crooked.
2. Position the Unit
Remove any shipping plugs or transport screws holding the door closed. Place the entire unit into the rough opening. Center it so there is equal spacing on the left and right.
3. Shim and Secure the Hinge Side
Focus on the hinge side first. Plumb the hinge-side jamb with a 4-foot level. Place shims behind each hinge location to fill the gap between the jamb and the stud.
Screw through the jamb, through the shims, and into the stud. For heavy solid-core or exterior doors, replace one short screw in the top hinge with a 3-inch screw that goes all the way into the framing for support.
4. Adjust the Reveal
Close the door. Look at the gap (reveal) between the door slab and the frame at the top and latch side. It should be an even 1/8 inch all around.
Shim the latch side jamb to adjust this gap. If the gap is tight at the top, shim the bottom of the latch jamb out. Once the gap is even, nail or screw the latch jamb in place.
Top Tip
Remove the door slab from the frame during installation to make the unit lighter, then reattach it once the hinge-side jamb is secured.
5. Final Touches
Score and snap the shims. Fill the gap between the jamb and the wall with low-expansion foam to insulate and lock the frame in place. Install your casing (trim) to hide the gap.
6. Hardware Installation
Since the holes are pre-bored, simply slide the latch in, attach the handles, and install the strike plate. Check that the bolt extends fully into the strike plate hole.
Tips for Hanging Doors Like a Pro
Taking a DIY approach is cost-effective, but you want professional results. Here are four rules carpenters live by.
Measure Twice, Cut Once
The margin for error is tiny, usually about 1/8 inch. If you cut too much off, you can’t put it back. Verify your measurements before your saw touches the wood.
Watch the “Cross-Leg”
If the wall isn’t perfectly flat, the two side jambs might not be parallel (known as “cross-legged”). This causes the door to hit the stop at the top but not the bottom (or vice versa). You may need to adjust your jambs slightly out of flush with the drywall to get the door to close flat against the stop.
Security Upgrades
For exterior doors, use 3-inch screws in the hinges and strike plate. This anchors the door into the structural studs, not just the thin door frame. It makes kicking the door in significantly harder.
Check the Diagonals
A frame can read plumb on each side and still be racked. Measure corner to corner both ways across the opening; the two diagonals should match within about 1/16 inch. If they don’t, the frame is twisted and the door will bind, so adjust your shims until the numbers agree.
What to Do When the Door Doesn’t Close?
If your door binds or bounces back, don’t panic.
- Loose Hinges: Tighten the screws. If they spin, fill the hole with a glued dowel and re-drive the screw.
- Door Sag: If the top latch-side corner hits the frame, drive a long 3-inch screw into the top hinge (into the wall stud) to pull the door back up.
- Swelling: In humid months, wood expands. You may need to plane a slight amount of wood off the rubbing edge.
FAQs
Do More With a Door
You now have three solid ways to hang a door: in a fresh frame, in an existing frame, and as a prehung unit. The next time a door won’t latch or lets in a draft, you know it usually comes down to a shim, a reveal, or a hinge screw that needs to reach the stud.
Your first door might eat an afternoon. The second goes twice as fast, and by the third you will be reading reveals by eye like a finish carpenter.
