The short answer is yes, hollow core doors can be trimmed. Hollow core doors have a strong block outer frame, which leaves a couple of inches of solid wood at the top, bottom and sides of the door. When it comes to allowing for alterations, this frame makes them a lot more forgiving than you might think.

How much can you cut off solid core door?

The recommended amount to cut a hollow core door is up to ¼ inch on each side. However, the actual block size is close to 1 inch on each side. If the block is cut too thin or cut off completely, then a new block should be installed to add structure and prevent moisture damage to the door.

What is inside a solid core door?

Solid core doors are made of a mixture of wood and synthetic wood composites. They have a heavy, solid interior and a wood veneer exterior. They provide the durability, sound insulation, and look of a solid wood door without the weight or hefty price tag.