How to Install an Interior Slab Door

Article Posted By: Home Depot Staff

How to Install an Interior Door

An interior door upgrade can rejuvenate any space, especially when it brings in natural light, as does this Masonite Door with Privacy Glass. It’s not hard to install an interior slab door (as opposed to a pre-hung door). Follow our step-by-step tutorial and learn how to give any room a whole new look.


Install an Interior Slab Door

Materials needed to install an interior slab door

Materials and Tools


Before and after installing an interior door

Here is a before and after shot of the room where we’re adding the new door. As you can see, this one simple DIY can make a huge difference.

STEP 1: Measure Your Old Door

Measure for the new door slab by checking the old door’s width in three places — across the top, middle and bottom of the door.

Jot down the widest dimension.

Next, measure the door’s  height and thickness.

How to Install an Interior Door: Measure Your Old Door


STEP 2: Remove the Door Hardware

Before removing the old door, remove the knob and any hardware off the old door frame using the appropriate screwdriver or drill and drill bit.

How to Install an Interior Door: Remove the Door Hardware


STEP 3: Remove Your Old Door

To remove the old door, start by backing the screws out of each hinge on the door slab with a screwdriver or drilling and pulling it away from the door frame.

How to Install an Interior Door: Remove Your Old Door


STEP 4: Dry Fit the New Door

Next, dry fit the new interior slab door in the opening, using shims to hold it in place if needed. If the new door doesn’t fit, the old door can be used as a template to indicate where the new door slab should be trimmed. Simply place the new door on a flat work surface, then place the old door on top of it, making sure to align both doors in the same direction (right side up, opening to same direction, etc.). Mark the bottom of the old door on the new door with a pencil.

How to Install an Interior Door: Dry Fit the New Door


STEP 5 : Trim the New Door

Next, with a utility knife, score along that line, then using a circular saw, trim the new door slab to size.

Sand any rough edges as needed with an orbital sander.

Note: Be sure to wear appropriate safety glasses and protective work gloves when using power tools.

How to Install an Interior Slab Door: Trim the New Door


STEP 6: Mark for the Hinges and Door Knob

Again, using the old door as a template, with a pencil, mark on the new door where the hinges and door knob will be located.

How to Install an Interior Slab Door: Mark for the Hinges and Door Knob


STEP 7: Score and Notch the Hinge Perimeters

Score the line around the hinges with a utility knife, then notch the perimeter and interior of hinge area with a hammer and chisel.

Next using the chisel, gradually skim off the notches.

How to Install an Interior Slab Door: Score and Notch the Hinge Perimeters


STEP 8: Attach New Hinges to Door

Once notching is complete, attach the new hinges to the new door.

How to Install an Interior Slab Door: Attach New Hinges to Door


STEP 9: Attach the Lockset

Secure the door lockset kit onto the door using the provided screws, then using the hole saw bit, drill into one side, then the other.

Next, drill into the side edge of the door to create a hole for the latch.

How to Install an Interior Slab Door: Attach the Lockset


STEP 10: Install the Latch

While the door is lying flat, install the latch portion of the new knob by tracing around it, then scoring with a utility knife and chiseling it out using the same method from Step 7, so that the latch lays flush against the door edge.

How to Install an Interior Slab Door: Attach the Latch


STEP 11: Attach the Hinges to the Door Frame

Once the latch is in place, move the new door to its location, add shims to adjust the door’s height and attach the other side of all hinges to the door frame.

How to Install an Interior Slab Door: Attach the Hinges to the Door Frame


STEP 12: Check the Fit

Hang the door and check the fit. If adjustments are needed, remove the door and sand or trim the door with a planer, as needed, then reinstall the door. If the fit is good, leave the door in place, and move on to finishing the lockset installation.

How to Install an Interior Slab Door: Check the Fit


STEP 13: Install the Lockset

Install the lockset using a Philips screwdriver. Follow the instructions that came with your particular lockset.

How to Install an Interior Slab Door: Install the Lockset


STEP 14: Install the Latch Plate

Install the latch plate into the door frame by lining it up with the latch from the door knob, then scoring/chiseling as we did in Step 10 with the hinges.

How to Install an Interior Slab Door: Install the Latch Plate


STEP 15: Paint the Door If Needed

If your door features glass, be sure to leave the protective plastic on until you’ve finished painting your door.

How to Install an Interior Slab Door: Paint the Door


Allow the paint to dry completely, and you’re done!

How to Install an Interior Slab Door

Browse our selection of Masonite Doors at The Home Depot.

Take a look at more DIY projects here on The Home Depot blog, and follow our Easy DIY Projects board on Pinterest.

Is your idea of DIY is hiring a professional? Let us do it for you. Contact The Home Depot Home Services.

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