I recently hired a contractor to replace all our interior doors. I specifically mentioned that I wanted to keep the same type of hardware and hinges (4-inch) and also wanted the new doors to be the same solid core style as our old ones. However, when the new doors were delivered, I noticed that the 4-inch hinges can't be used with them, and the new doors are noticeably thinner, lighter, and don't feel as sturdy as the old ones. How can I check if these are truly solid core doors? I suspect that the quality is different, especially as I have replaced two exterior doors and can tell the difference. Also, from looking at the hardware holes, the new doors appear different internally too.
3 Answers
To check if your doors are solid core, try knocking on them. Solid doors have a different sound and feel compared to hollow ones. You can really tell when you tap on them; hollow doors sound more like a drum. But since you say they're thinner and lighter than your old ones, that's a red flag for sure!
Yeah, you might have gotten ripped off. It's important to have everything detailed in your contract with contractors. Sadly, many don't always uphold professional standards. Be sure to advocate for yourself and clarify what's in the contract for any future work you have done!
Exterior and interior doors indeed vary. It sounds like your old doors were solid wood or solid core, while the new ones might be a cheaper option. You could measure the thickness of both sets; standard interior doors are usually around 1 3/8 inches thick. If these are less than that, that's a concern. Also, it’s a good idea to ask why the hinges can’t be used. It sounds like you might not have received what you paid for.
I'll measure the thickness when I have a chance. I doubt they’re hollow core since those feel super light and I can usually put my fist through them! But I definitely want to confirm if these new ones are solid core or not.

I did knock on them and they feel harder, but I can't tell if it's just because they are lighter and thinner.