Hi I am converting a garage/basement into a rehearsal space/project studio. We won't be playing any very low frequency/loud instruments at all, ever in this space. No bass amps, kick drums etc. It will be acoustic instruments, vocals, some piano, strings and probably no more than 3 players at a time. We will be using it to rehearse, record/mix some demos/pre-production stuff and for listening After playing in residential locations a lot and given the nature of the garage and softness of the music, I've decided that sound insulation is of vital importance. Here is a floorplan of the garage as is: Here is roughly what I plan to do: Explanation: The garage door is one of those up and over metal doors. I plan on putting in a new wall part way down the garage to split the garage into a small, regular garage and a seperate room. I plan on putting a door to allow access to this new room from the hallway of the house. The 'VOID' marked on the original floor plan is actually an empty, closed off room - concrete base and breeze block walls like the garage. The site manager told me that it is closed off simply because of regulations on the development. Apparently, if they had opened it up, the garage would be reclassified as a room and then there are some rules about windows and wall treatments etc... But, he has assured me there is absolutely no problem with us opening up (after we have bought the house) and doing what we want with it. It is not a supporting wall so should be relatively easy for a builder to do. I plan on having not a door, but a large opening to make it open plan. We couldnt measure the width of the 'void' (cause we cant get in) so my 2.5m is a guess based on dimensions of other rooms. I've lost my measurement of the ceiling height, but it is somewhere between 2.5-2.8m So, marked in yellow is the floor space of the room I'll be building. Above the garage is the living room of the house and the right wall of the garage is shared with next doors garage (it is a semi-detached house with integral garage...) The back wall of the void is against earth (the house is on a hillside, so the back wall of the 'ground' level is essentially underground), so I would assume no sound insulation is required on this wall. As the left wall is onto our own hallway, I would assume that relatively little (compared to the new wall and right wall) insulation is required here. Questions My sole question is how should I approach sound insulation? The key areas I believe will be the wall adjoining next doors garage and the new partition wall. Keeping sound out is key. The house is on a cul-de-sac so there will be relatively little traffic noise, but likely people chatting next door, and all the leakage through the garage door to keep out with the partition wall. I also dont want the neighbours disturbed... Obviously, given the size, keeping wall thickness to the minimum required for adequate sound insulation is a must. I had been looking at wall 'systems' such as this: http://www.british-gypsum.com/white-book-system-selector/systems-overview/gypwall-audio but I don't know if this is the way to go? Finally, how to approach insulating the ceiling?