Why would there be a minimum length? A garage could be 10'X10' but a car will not fit in it, I have a 22'X22' and a full size pickup will not fit in it, so it depends what you drive.
The average length would be 24' but bigger is always better.
It would depend on the size of the one car garage and garage door opening.It depends on the size of the garage. Not all one car garages are the same size.
A one car bay garage is usually a free standing structure with room for one car. They can be attached to a house.
A parking area for one car inside a garage.
a metal one.
The average with of an one car garage is 12 feet. Many people will want a few extra feet of width for storage.
10 X 10 a two car garage is 20 X 20 or 400 Square Feet
In my opinion, I can find a cheap car garage kit from a garage sale, or a cheap second-hand tool store. It's also possible to get one from a neighbor.
You can get insurance for a 4x4 car online and at your local garage. The price ranges but you will have to get a quote online to get an exact amount or go to your local garage.
Some things a person may do at a city garage is get the oil changed on a car or get the air conditioning fixed in a car. A person may also replace old tires at a city garage.
It varies on what size car you plan on putting in it.