I just went through a fairly thorough soundproofing project for my apartment in SF. (If anyone has any questions or needs advice, I&#x27;m happy to help.)<p>Few things I learned:  1). It doesn&#x27;t have to be expensive. My problem was that I live in a 2BR apartment with a wonderful roommate -- but we share a bedroom wall, and that wall is thin. So you can imagine the....awkwardness...at times.<p>I got quotes from various soundproofing specialists that ranged from $10k to $25k (!!!) to thicken the shared wall and reinforce the bedroom doors. Hogwash. I did some research, bought some raw materials (Green Glue, QuietRock sheetrock, solid-core doors, door seals) and did the whole thing for a fraction of that price.<p>2) Sound science is fascinating and DIY projects like this are kinda fun :) I&#x27;ve never been much of a DIYer around the home, but it takes on a whole new appeal when you have a clean end goal in mind and your quality of life takes a major improvement when the mission is completed.<p>Anyway -- this is a fascinating subject and I&#x27;m happy to geek out about it with anyone who&#x27;s interested.