Shopping for a paint-ready interior door can be confusing, since you can’t see what’s underneath the primer. If a traditional wood door (generally pine or poplar) is what you’re after, you’ll have to special-order it—and expect it to expand and contract with changes in humidity. Here’s how other interior doors are built today.

Doors - This Old House

How Doors Are Assembled This Old House

molding door This Old House

Doorframe is shifting in an old house. The door is also shifting

How to Install a Pre-Hung Interior Door

How Doors Are Assembled This Old House

How Doors Are Assembled This Old House

Guide to Old Doors

See How Salvaged Doors Add Character to a Home

Looking Through Open Image & Photo (Free Trial)

Inside Interior Doors - This Old House

IC1400 - Antique Four Panel Door - 34 x 81-1/4 - Legacy Vintage