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What size ADU are you considering?
A studio in this estimator is about 400 square feet. That is $120,000 to $152,000 at a standard finish, $152,000 to $184,000 at premium, and $184,000 to $220,000 at luxury.
A studio is the cheapest ADU to build in total and the most expensive per square foot, for the reason below.
A one bedroom is about 600 square feet, which comes to $180,000 to $228,000 at a standard finish, $228,000 to $276,000 at premium, and $276,000 to $330,000 at luxury.
A two bedroom is about 800 square feet, which comes to $240,000 to $304,000 at a standard finish, $304,000 to $368,000 at premium, and $368,000 to $440,000 at luxury.
The rate covers designing and building the unit itself. Site work is not in it, and on a real lot that is the number that moves: utility connections and any panel upgrade, sewer or septic work, grading and drainage, tree removal, and access for machinery.
Design fees and city permit fees vary by jurisdiction and sit outside this figure too.