What about the money I could make renting the ADU?

Rental income is a major benefit of having an ADU or JADU on your property – for many people, it provides flexibility in their budget or an opportunity to grow their savings. In many places, you cannot rent your ADU for less than 30 days at a time (e.g., AirBnB, Vrbo), and shorter-term rentals are not permitted. Review your local ADU rules to see if your property is subject to restrictions. The San Mateo County ADU Calculator can help you estimate how much rental income could be generated by your new unit.