What Size Interior Door Do I Need? A Room-by-Room Guide
Whether you're replacing a few tired hollow-core doors or finishing a new build, the first question is almost always the same: what size do I need? Interior doors are sold by width and height in inches. A "32 x 80" door is 32 in. wide and 80 in. (6 ft 8 in.) tall. Most homes use a handful of standard widths, and each room tends to have a natural fit. Here's how to choose.
Standard Interior Door Sizes at a Glance
- Widths: 18, 24, 28, 30, 32 and 36 in. are the most common.
- Heights: 80 in. (6/8) is standard. 96 in. (8 ft) doors suit 9 and 10 ft ceilings.
- Thickness: 1-3/8 in. is standard for residential interior doors.
Our White 2-Panel Shaker Solid Core Primed MDF Prehung Interior Doors come in all six widths at 80 in. tall, with 96 in. versions available too.
Room-by-Room Sizing Guide
| Room | Typical width | Notes |
|---|---|---|
| Linen or utility closet | 18 to 24 in. | Narrow openings where space is tight |
| Reach-in closet (single door) | 24 to 30 in. | Wider closets often use doubles or bifolds instead |
| Powder room / half bath | 24 to 28 in. | Small rooms often get the narrowest swinging door |
| Full bathroom | 28 to 30 in. | 30 in. makes moving a vanity or tub easier |
| Bedroom | 30 to 32 in. | 32 in. is the most popular choice in newer homes |
| Primary bedroom / suite | 32 to 36 in. | Wider feels more open and helps with furniture |
| Laundry room | 30 to 32 in. | Measure your washer and dryer first |
| Accessible / aging-in-place rooms | 36 in. | The easiest way to get about 32 in. of clear width |
| Garage to house | 32 to 36 in. | Usually must be fire-rated; see note below |
Why 32 in. is the most popular width
A 32 in. door is wide enough to move most furniture through, fits a standard bedroom wall, and looks proportional at 80 in. tall. That's why it's our best-selling interior size. The 24 in. and 30 in. sizes follow close behind for bathrooms and closets.
Planning for wheelchair access
Accessibility guidelines usually ask for about 32 in. of clear opening, measured from the face of the open door to the stop on the opposite jamb. A door's clear width is smaller than its nominal width, so a 36 in. door is the reliable way to get there.
80 in. or 96 in. Tall?
Match the door height to your ceilings and your existing doors:
- 8 ft ceilings: 80 in. doors are standard and look right.
- 9 ft ceilings: 80 in. works, but 96 in. doors give a more custom, open feel.
- 10 ft ceilings and up: 96 in. doors are usually the better proportion.
Keep heights consistent within the same hallway or room. For 8 ft openings, see our 24 in. x 96 in. 2-Panel Shaker prehung and the other 96 in. widths.
How to Measure for a Replacement
- Measure the existing door slab: width, height and thickness.
- Measure the rough opening if you're buying a prehung door. That's the framed opening behind the trim. As a rule of thumb, it's about 2 in. wider and 2 to 2-1/2 in. taller than the door.
- Measure the wall thickness. Our prehung Shaker units use a 4-5/8 in. finger-jointed pine jamb, sized for a typical 2x4 wall with 1/2 in. drywall on both sides. Thicker walls need a jamb extension.
- Note the swing (handing) before you order. Our units are sold left- or right-hand inswing and can be reversed for an out-swing.
For a step-by-step walkthrough, read How To Measure For A New Interior Door. If you're on the fence about prehung vs. slab, see Prehung vs. Slab Doors: What's the Difference.
A Note on Garage and Fire-Rated Doors
The door from an attached garage into the house usually has to meet fire-safety rules, so a standard interior door isn't the right fit there. Browse our fire-rated doors for 20-minute rated house-to-garage units.
Why Solid Core for Every Room
Our 2-panel Shaker doors are solid core MDF, 1-3/8 in. thick, with 12 mm MDF panels and three hinges per door on 80 in. models (four on 96 in.). Solid core doors feel more substantial, block more sound between bedrooms and baths, and resist dents better than hollow-core doors. They arrive primed white, with one bore included, and are assembled to order.
Ready to order? Shop all interior doors, or contact our team with a list of your rooms and openings. We're happy to help you build out a whole-house order.
Frequently Asked Questions
What is the most common interior door size?
32 x 80 in. is the most common bedroom door, and 30 x 80 in. is close behind. Bathrooms and closets usually use 24 to 30 in.
What size door do I need for a bathroom?
Most bathrooms use a 28 or 30 in. door. Powder rooms often take 24 in. If you need wheelchair access, plan for a 36 in. door.
Can I put a wider door in an existing opening?
Only if you enlarge the rough opening, which means cutting drywall and reframing, and possibly adding a header. It's easier to match the existing size unless you're remodeling.
What thickness are interior doors?
Standard residential interior doors are 1-3/8 in. thick. Our Shaker interior doors are 1-3/8 in. solid core MDF.
Do interior doors come with the frame?
Prehung doors come mounted in a frame (jamb) with hinges. Slabs are the door panel only. Prehung is usually the easier choice when you're replacing a damaged frame or doing new construction.
