California Land Buying Checklist for Tiny Homes and ADUs
Check the property before you fall in love with the idea. Buildability depends on zoning, access, utilities, septic, fire, flood, slope, environmental constraints, and the permit path.
Do not buy land before checking buildability
A low price does not mean a parcel can support a legal home, ADU, tiny home, septic system, water source, utility connection, driveway, or fire access.
APN and parcel basics
Get the assessor parcel number, parcel map, legal lot status, parcel size, boundaries, easements, and jurisdiction before relying on a listing description.
City vs unincorporated county
The responsible planning department controls zoning interpretation. A parcel inside a city follows city rules, while unincorporated land generally starts with county planning.
Zoning and general plan
Confirm the zoning district, general plan designation, allowed residential uses, density, overlays, conditional use rules, and whether a tiny home or ADU classification is available.
Minimum lot size and dwelling size
Some districts have minimum lot sizes or dwelling standards. Small homes still need to satisfy building code, zoning rules, and local interpretation.
Setbacks, road access, and easements
Usable building area can shrink quickly because of front, side, rear, slope, fire, drainage, utility, access, and private-road constraints.
Water, sewer, septic, and wells
A service area is not the same as a connection. Ask about actual water meters, sewer main distance, septic feasibility, perc testing, well permits, and connection fees.
Electric and utility extensions
Vacant parcels may need line extensions, trenching, transformers, easements, meter panels, and utility applications before a permit path makes sense.
Fire, flood, slope, and environmental constraints
Fire hazard zones, flood zones, steep slopes, drainage, habitat, wetlands, coastal zones, and grading limits can change cost, timeline, and feasibility.
Questions to ask before making an offer
Ask planning, building, environmental health, fire, public works, and utility providers what could stop the project, what submittals are needed, and what fees or studies are likely.
- Find the APN and jurisdiction.
- Confirm zoning and overlays with planning.
- Confirm water, sewer, electric service, and access.
- Ask environmental health about septic and well feasibility.
- Check fire, flood, slope, coastal, habitat, and easement constraints.
- Request help before making an offer on unclear land.
Checking a property? Start here.
Use the property checker to organize zoning, utilities, septic, fire access, setback, and permit questions before you buy land or order plans.
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