Professional Guide: Install an Interior Door

Mastering Interior Door Installation for Construction Professionals

Installing an interior door with precision is essential for maintaining the quality and value of a residential build. For construction professionals, understanding the nuances of door installation can prevent costly callbacks and enhance client satisfaction. In 2025, the cost of installing an interior door ranges from $650 to $1200 per opening, depending on materials and labor rates. This guide provides a comprehensive approach to door installation, ensuring flawless results backed by accurate data.

Pre-Installation Planning

Before beginning, verify rough opening dimensions and door swing direction. Accurate planning prevents costly reorders and ensures a smooth installation process.

Materials and Tools Checklist

Pre-hung interior door sized to rough opening
2 ½" finish screws for hinges
3" structural screws for jamb anchoring
Wood shims
4’ level and combination square
Finish nailer or hammer with 8d finish nails
Minimal-expansion spray foam or fiberglass insulation
Interior casing and stool trim
Paint, stain, or sealer plus touch-up supplies

Step-by-Step Installation Process

1. Confirm the Rough Opening

Measure width, height, and plumb. Ensure 2" of total extra width and 1" of headroom above the door slab. Adjust framing as needed.

2. Dry Fit the Pre-Hung Unit

Remove shipping braces and slide the door into the opening. Check for a uniform ⅛" gap around the slab.

3. Shim the Hinge Jamb

Insert tapered shims at the top hinge and drive a 3" structural screw through the jamb. Repeat for middle and bottom hinges.

4. Square the Strike Jamb

Close the door and use a level to ensure vertical alignment. Shim and secure with 3" screws.

5. Insulate the Gap

Fill the cavity between jamb and framing with minimal-expansion foam to avoid bowing the jamb.

6. Install Interior Casing

Once foam cures, cut casing to length and nail lightly into the jamb.

7. Final Adjustments and Finish

Check swing, latch, and reveal. Apply touch-up filler, sand, and finish.

Pro Tips for Construction Professionals

Use an 18-gauge brad nail to tack shims together before driving screws.
Paint the door slab before installation to reduce drips.
Swap one hinge screw per hinge with a 3" screw for extra support.
Leave the bottom shipping wedge in place until casing is nailed.
Log every adjustment for future reference.

Why Choose Professional Tools for Door Installation

Utilizing advanced tools and software ensures precise material costs, optimal crew sizes, and efficient project management. This precision leads to tighter bids, fewer change orders, and higher client satisfaction.