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Since the site and construction of each ADU varies, it is impossible to estimate. The cost per-square-foot is likely to be the same as other new residential construction. Builders and architects can give you rough estimates.
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Many people will draw on a home equity line of credit if there is equity in an existing home. You can refinance your existing mortgage or take out a larger loan to provide construction cash. Some people take out a construction loan and refinance the loan with a new mortgage when the construction is completed. Talk with your lender about the best option for you.
No. the ADU is part of your home. You can only sell the ADU if you sell your house too.
Yes. Contact the Department of Planning and Zoning for more information.