How do you sound insulate between stud walls & can it be done retrospectively?

[Genieinalamp]

We've just finished an extension and the shower in our ensuite is on one side of a stud wall, DD's bedroom on the other. DP gets up to shower at 5.30am and it's so blummin noisy in DD's room that he can't use the shower as it wakes Dd up.

Is there anything we can do about this? We are hoping to put a big wardrobe in front of the stud wall to absorb the noise but I wondered if anyone had any recommendations? Also, for any future work, what should our builders have used to sound insulate?

the usual things are to pack between the studs with dense, heavy mineral wool batts, and to use two layers of plasterboard each side. More involved work uses two not-touching walls, and layers of dense rubber membrane, but this is specialist work. A skilled and experienced plasterer may have done it before.

At this point, you could pull the plasterboard off one side to pack the spaces, and double-layer that side ofthe wall when remaking. Probably not the bathroom side if it is tiled. It will not be a big job for an experienced plasterer, but there will be dust and you will have to redecorate.

Also, packing between the floor and ceiling joists, and blocking all pipe or cable holes, will subdue noise flanking under and above the partition. You might be able to DIY that bit.

A built-in wardrobe, floor to ceiling, gives another isolating layer, especially when full of clothes.

Is it a power shower?I wonder if it is the pump you are hearing, we were able to stand ours on some noise reducing thing and cut down the noise.