Today, people are putting almost as much thought into the garage apartment as they are the actual home. Wall Street Journal staffer Nancy Kates takes a look at this trend which is continuing to grow thanks to such factors as children living with parents longer and possibly housing one's own parents.

For some, building up is the only way to add and extra room, and the rise of services like Airbnb has made having an extra space in your home more valuable. While the cost can be recouped, the prices vary:

Tim Shigley, the chairman of the National Association of Home Builders’ remodelers council, says garage apartments tend to be about 400 square feet; the cost of the projects he has done range from $75,000 (usually an existing, attached garage so there are no extra hard costs like heating and air systems) to $200,000, depending on the level of the finishes.

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