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If it’s a brick built garage and you’re paying a builder, suspect it’s going to cost £20k ish.
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It's relatively easy to attenuate noise down to around 120 Hz ish. Frequencies below that are quite difficult to stop but you can get to the point where although they escape the building they lose so much energy that they aren't a problem to your neighbours.
I’ve done a couple of garage conversions . My own one and one for a friend. My one was very good at not letting sound escape as I built a concrete wall behind the garage doors, built a double door system at the other end and built a quad glazed window to let light in.
I used to record guitars in here at ear splitting volume. Sometimes at 2 in the morning. Never had a problem. Bass was DI'ed so that wasn't an issue. For drums I tended to track with my mobile rig in all kinds of places or sometimes used V-drums.
Cost wise materials are now 4 times the price they were were when I did this. You could spend 5K quite easy now not including labour.
Attention to detail is essential. As I mentioned I built a concrete wall behind the garage doors. Concrete, not breeze block or thermalite wall. Mass stops sound so mass is essential. I fitted the outside UVPC door and window myself because I measured it to a 5mm gap. That gap was then completely filled all the way through with cement and then acoustic caulk. The sills of the window and door were filled with sand. The inner door was solid wood vandal proof fire door which was then clad in 18mm MDF and covered in carpet. All gaps were as small as possible and then completely filled with acoustic fire retardant caulk. Nothing was cut into the plasterboard, all the wiring was surface mounted.
Most builders won't do any of this. They work fast and efficient but to larger totorances and will use materials like expanding foam, thermalites, mastic etc. If air can escape then sound can escape. If you do the job right you won't see any insects on the inside unless you leave the door open. There will be no gaps.
Make sure you read up on u values and stuff esp with Rockwool/Celotex insulation. Rockwool is better acoustically, and I have 100mm thickness in one of my partition walls in timber frames. Does a nice job of isolating sound. As mentioned already mass stops sound so make sure there's no air gaps.