It is highly unlikely that you will have to acquire a building permit for this type of project, unless you decide to do any kind of plumbing or electrical wiring. When in doubt, be sure to check your city's building codes.
Design your wardrobe according to your needs. That is if you wear clothes that are meant to be hung in then get more hanging space instead of shelves. Design it in a combination of drop rails, short drops, drawers and shelves. Analyze what suites you the most.
If there are high ceilings in the garage then there are specially designed shelving units that hang from the ceiling. These enable you to hang, and place things on the shelving, allowing vital floor space to not be used. If you decide to fit this design of shelving you will need to ensure they are not in the way of the garage door mechanism. They will also need to be fitted securely, and at the correct height often they can be adjusted to suit different requirements. Often this design of shelving is made from metal, ensuring that it is more durable and strong.
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