Right now San Diego County as a whole supports Accessory Dwelling Units (ADU's), granny flats, casitas, room additions and in some cases garage conversions. However, you really need to start with your local building, planning and zoning department. But be sure you also consult with your HOA as many developments, especially in Poway, have CC&R's that address parking in the streets or driveway for extended periods of time.... more
If you are just remodeling and not adding, there is a chance that you will not be reassessed. I would need to know the specifics of your improvement. Otherwise, it depends on what area you are in. Daniel is correct, a good average is 1.25%, although it could be higher or lower, depending on your location.
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