• I'll raise floor so sound insulation isn't an issue.

    I'm presuming by this you mean it won't be an issue to put some sound insulation in the bigger floor void, not that raising the floor in itself will deal with it?

    Just if it's the latter and you increase the air gap but don't put anything in to dampen and absorb sound you'll effectively just increase the size of the area sound can reverberate in.

    Sorry if this is obvious!

  • Exactly, space available to fit sound insulation between new joists under new floor level.

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