ADU Facts Every Homeowner Should Know

Up to 1,200 sq. ft. for most lots in California.
Attached ADUs are limited to 50% of the existing home’s size.

Yes — typically 15–30% depending on design, finishes, and rental potential.

In most cases, no — especially if you’re within ½ mile of transit or converting an existing structure.

Not usually. If the main home doesn’t have sprinklers, the ADU typically doesn’t need them either.

You pay tax only on the value of the new ADU, not your entire home. This usually adds $1.5k–$3.5k per year depending on size.

Water, sewer, and electricity can connect to the main home, but some clients choose separate meters for rental purposes.

Yes. California law allows ADUs to be rented long-term (30+ days), and many cities allow JADUs for additional flexibility.

Your city approves architectural plans, structural engineering, energy compliance, and site requirements.

ADU BUILDS handles everything — design, submittal, revisions, and final approval.

Yes — typically one full ADU + one JADU on a single-family lot.

Not always, but recommended if property lines or setbacks are unclear.

– Detached ADUs: usually 4 ft from side/rear
– Attached ADUs: must follow existing home setbacks (varies by city)

Possibly. Older homes sometimes require a 200-amp panel to support both structures.

Absolutely — layouts, finishes, architecture styles, and elevations can be fully tailored to your property.

Yes — including:
– HELOC
– Cash-out refinance
– Construction loans
– Specialized ADU financing products