Constructions can range within garages from something as simple as applying sound proofing to the existing shell to building a room within a room construction.
Garage door sound dampening.
Mounts between the garage door openers motor head mechanism and the support brackets.
Works with all overhead types of garage door opener that are bolted to support brackets.
Buy an insulated garage door.
Then there are gaps on the sides on the top and on the bottom of the door which will let out a lot a sound.
These doors are not entirely soundproof but they are thicker than standard garage doors and therefore provide better sound insulation.
And a garage door is the worst type.
Garage doors are huge.
Since this item has two independent isolated bolts molded to the rubber it provides for maximum isolation of noise and vibration created by the garage door opener motor head.
Replace old doors with insulated doors.
You can purchase a new insulated garage door that provides both thermal and sound insulation.
In any room the door will be the weak link which will easily let in or let out sound.
If you regularly use the door and cannot to block it off you can install a curtain rod above the garage door and hang a soundproofing material such as mass loaded vinyl mlv or an acoustic quilt.
Another way to keep sound from escaping through the garage door is to replace the doors with insulated doors.