Do you live in a newbuild? Can you hear every whisper from the room next to you/above you/below you?

[emkana]

Our extension is very nearly finished now but I am a bit at how little sound insulation there seems to be between upstairs and downstairs!

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There are, I believe, quite stringent building regs about noise insulation so it may be worth speaking to the building inspector about whether they apply to extensions or whether it's just something that has to be used between dwellings. Also, bear in mind that until the new rooms have flooring laid and furniture, curtains etc put in, they will seem much noisier.

If it is really bad, you can reduce impact noise with foam-backed chipboard put down under the flooring - we used this and it does make a real difference. It was about £600 to do 80 sq m - we fitted it ourselves.

we used to live in a new build house and never had the need for a baby monitor, even fom the furtherest rooms apart from up to down you could hear everything.

now live in a 60's built house which is very different. so yes I believe times have changed and walls/floor now seem more 'thin'. Not sure what can be done now it's built.