If highway or external noise is the issue, then insulating cavity partitions with mineral wool or cellulose will help but the leading culprit will be the windows. Double or triple-glazed windows will certainly be required, and that is now regular in a whole new build anyway. Phil's track record as https://banksy-cleaner-on-canvas03566.loginblogin.com/39547840/the-basic-principles-of-home-improvement