How much freedom does our older child require? Work from home? Maybe you just need a little extra space for a new project you've been planning? You can solve this problem by building a new extension to your garage.
It doesn't matter whether your garage is attached or detachable from your home; an addition to your garage can expand your living space. Your older child, visitors, or a parent living with you can have their own private quarters in the area above the garage. It's possible to transform your garage into a home office. There is a good chance that you will be able to work uninterrupted in this location. It's also possible to turn the additional addition into a music studio with some simple sound-proofing techniques.
Start by creating a budget and then hiring a contractor because this is a very involved undertaking. In addition, you may require the services of an architect to assist you with the design of the building.