What can be done to people that have a garage or two stuffed with stuff and therefore park on the street where parking is limited? If they neglect doing maintenance on front lawn areas the city can force them to do it or call in an outside contractor at a cost to the owner. Why can you not force the owner to use the garage or charge them extra to park on the street?  A garage is for a car, a workshop is for a hobby. A workshop need not be next to the street curb. Demand that garages be used for cars (not STUFF) and street parking availability will increase.