The ABCs of ADUs
The ABCs of ADUs, published by the American Association of Retired People (AARP) is “a guide to accessory dwelling units and how they expand housing options for people of all ages”. This is a very well-illustrated 20-page pdf on the possibilities and uses for an additional housing unit on your property. They address the zoning code (which is changing, but the key points should be clarified), planning & paying for the ADU, styles of ADUs such as a garage or basement ADU, attached addition or separate unit, and more.