Why zoning matters even after you know the citywide ADU rule
Many homeowners assume their city's general ADU ordinance tells the whole story — a single height limit, a single size cap. In practice, several cities set an ADU rule that's conditional on your underlying zoning designation. For example, an attached ADU might be allowed up to two stories and 25 feet, "or the height limit of the underlying zone, whichever is lower" — meaning your specific zone can cap you below the ADU ordinance's own stated maximum.
How to actually look up your zoning
What to do with the information once you have it
Once you know your specific zone, compare it against your city's ADU ordinance to see whether any zone-dependent conditions apply to your property — for example, whether a stated height allowance is capped by your zone's own limit. If you're unsure how to interpret what you find, a property review can help you translate your zoning designation into what's actually realistic for your lot.
This is general guidance, not a determination for your property
Zoning maps and codes vary significantly between cities, and interpreting how a specific zone interacts with your city's ADU ordinance can require professional judgment. This page describes a general research process, not a specific zoning determination — always confirm directly with your Planning Department before finalizing your design.
Frequently asked questions
Not necessarily — some cities set a general ADU height allowance that's separately capped by whatever your specific zone allows, whichever is lower. You need both pieces of information to know your actual limit.
Most cities publish a free, public zoning map online through their Planning or Community Development Department. Your county assessor's website can also help confirm your parcel number if you need it to search the map.
Contact your city's Planning Department directly — staff can typically confirm your specific zoning designation over the phone or by email.