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In most cities, you’re required to have a building permit in order to construct a pool house on your property. The exact type of permit varies by region—in some areas, it might cost as much as $2,700 to get the necessary permits, while other cities don’t require any permits for structures under 200 square feet.

If you’re building a custom pool house, you can expect the entire process to take two to three months from the design phase to the end of construction, or even as much as a year for very large or complex pool houses. If you’re installing a prefabricated kit or shed, the process is much faster—usually one to three days.

Most pool houses can range from 100 square feet to 800 square feet. Smaller pool houses are about 100 to 150 square feet, while a spacious pool house is at least 300 square feet.