Standard Interior Door Widths and Heights for Homes

When replacing or planning interior doors, knowing standard dimensions saves time and money. In the U.S. and Canada (and widely followed elsewhere), the norms are:

Widths (Nominal)

• 2'0" (24") – Closets, small bathrooms (less common now)
• 2'4" (28") – Older homes, tight spaces
• 2'6" (30") – Standard for bedrooms, bathrooms
• 2'8" (32") – Most common modern standard for bedrooms, bathrooms, offices
• 3'0" (36") – Master bedrooms, accessibility (ADA compliant), laundry, utility

Actual door slab width is ¼" less than nominal (e.g., a 32" door is 31¾").

Height

• 6'8" (80") – Universal standard for residential interior doors.
• 7'0" (84") – Upgrade option, common in newer custom homes.
• 8'0" (96") – Luxury/statement doors, requires taller rough opening.

Thickness

• 1⅜" (35mm) – Standard hollow-core or solid-core.
• 1¾" (44mm) – Solid-core, fire-rated (20-min), or exterior doors used inside.

Rough Opening (Framing)

Add 2" to width and 2½" to height for the framed opening (e.g., 32" door → 34" × 82½" RO). Always verify manufacturer specs.

Quick Reference

Measure twice, order once. Custom sizes cost 2–3× standard.