Many new homes that are built do not have a garage attached to the property as this is an additional expense for the developer and so if you do have a garage it is valuable extra space.
Most people do not keep their vehicle in the garage and instead use it for storage. It may be used to store gardening equipment such as lawnmowers and gardening tools throughout the year and garden furniture during the winter months. A garden shed is often used to store this equipment, but it is often more convenient and more secure to keep it in the garage where it is easily accessible.
Garages can be used as an extra room in the house often as a utility room with a washing machine and tumble dryer installed. Some people choose to convert them into a games room for the whole family to use or as a gym with treadmills, rowing machines and weightlifting equipment.
If the garage is attached to the property it may be possible to convert the garage into an extra bedroom or a dining room, but it will be necessary to insulate and plasterboard the walls of the garage to make sure it is possible to use it in this way. If there is any doubt it is worth asking a builder to take a look at the garage to see whether your plans for the conversion are possible and whether there needs to be building consent approval.