Utah law already lets you build a second living unit inside your own house, and most homeowners I talk to here have no idea it is on the books. Under Utah Code 10-21-303, effective November 6, 2025, an internal accessory dwelling unit is a permitted use in any area zoned primarily for residential use, and a city may not restrict its size relative to the house, the lot size, the street frontage, or how the two spaces connect. Detached units are where the local rules bite, and St. George rewrote its version three weeks ago. Here is what the code says in each city as of September 10, 2026, with the sections so you can read it yourself.
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