You are worried about the costly Porsche that is sitting outside in the rough weather. The reason could be any of the following:
The garage does have not room for one more car. The garage door is broken, or there is some problem with the garage structure. There is a lot of space left but it is unoccupied and does not get used. The garage was made with a particular kind of car in mind. Or on the other hand, the house does not have a proper garage at all.
All these problems have just one solution, and that is for you to step on the gas and get going with your woodworking skills. The web will help in all the steps possible. Instead of getting through a rather tough manual where the visuals are scribbled in fine print and is difficult to assemble the final parts, you can choose to ride on the power of the internet and get that garage done in a week.
Today, to get one garage going you need to have the whole plan chalked out since it is not a single piece of furniture, and has the complete element of house building to it. For example the garage door, the shelves, and any other functional cabinets and the toolbox. The walls and the roof of the garage if made using wood should all be available on the DIY plan. And it helps to find some help in building it.
There are sites where you could look for plans for the individual parts and later on, assemble them yourself. There are other places where the overall garage plans are available. You can choose the garage that you want, whether it will be for 1 car or 2 cars or more. A very well-designed site with hundreds of visuals and illustrations speaks volumes about the hard work put in making this a hot favorite for all who plan to make a garage all by themselves.