Just some thoughts related to safety:
Is this garage attached to the house ? Is the room above the garage considered living space ?
Walls and ceiling of the garage will most likely require a minimum fire rating (1 hour unless local codes require more, less if there is a sprinkler system). Doors between garage and home also need to be fire rated (steel or solid wood doors, hollow core interior doors are not permitted).
If the garage and home have a common roof, spread of a garage fire through the attic to the home is also a concern.
If the garage floor is slightly sloped towards the garage door flammable liquids (gasoline) will drain away from the house (as well as making it less likely for rain water to enter the garage).--
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