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Old 24th October 2019
  #7
Lives for gear
 
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An acoustic rated door with seals can cost £1 500. Then you have labour. Wall and ceiling area is ~55m2. Double layer of 15 mm thick gypsum board at £11 a sheet is ~£550 plus screws, tape, mudding, paint and labour. Nothing estimated for HVAC. Those are off the top of my head.

If there are places in your neighbourhood (Jason and I are thousands of kilometers distant and on different continents) that you like ask them about their construction.