How to improve the acoustic performance of an ordinary internal door?

[WWilts]

New build in progress.
Are there low cost ways of enabling ordinary internal doors (only 12 kg weight) to perform better acoustically? ie Letting less sound through.

Preferably without making the door look awful

Trying to decide which doors to order.

[Bonner]

No.1 for me would be to fit self closers, an open door is useless!

Next make sure they are very well fitted, minimal gaps and all round seals if you want to go that far. Have you thought about fire doors? 

[JohnMo]

But you need an undercut of 10mm if you have MVHR or MEV for ventilation purposes.  So they will never be great.

 

Fire doors are solid so may have better accoustic properties.  Fire seals will stop the noise transmission where you don't need gaps

[Dreadnaught]

I you have MVHR, you may need to cut a slot under the door to allow air movement.

 

Alternatively, if sound through that slot is a concern, you could do what I plan to do. Have a close fitting door withut the slot, which is much better for sound proofing. And instead install a small air vent of an appropriate size in another wall where sound is not a concern. In my case, the vent will lead to a quiet neighbouring corridor via a built-in wardrobe.

[JohnMo]

You can also get noise attenuation wall vents