California and Sacramento ADU rules in plain English — size, setbacks, permit timelines, parking, fees and owner-occupancy. We handle the whole process.
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California has rewritten its ADU laws repeatedly to make backyard homes easier to build, and the state rules now override much of what individual cities can restrict. Here's the plain-English version of what applies in Sacramento as of 2026. (Rules change and details vary by lot and jurisdiction, so we always confirm the current specifics with your city or county before designing.)
A detached ADU can be up to 1,200 square feet. Critically, the state guarantees your right to build at least an 800-square-foot unit regardless of local zoning objections, as long as you keep the 4-foot setbacks. A Junior ADU (JADU) is capped at 500 square feet and must be within the existing home.
ADUs are allowed with just 4-foot rear and side setbacks. And if you convert an existing garage or accessory structure into an ADU without changing its footprint or dimensions, no new setback is required — even if the structure sits near the property line.
The state sets a hard 60-day window: once your application is complete, the city must approve or deny it within 60 days, and any denial must come with a specific list of what to fix. Recent law (SB 543) also added a 15-business-day completeness check up front. In the City of Sacramento, using a pre-approved plan is the fastest route — plan check can drop to a few business days and permitting to roughly 30 days, versus longer for custom designs.
No new parking is required for an ADU when the property is within a half-mile of public transit, and the same zero-parking rule applies to conversions of existing garage or interior space. Otherwise, a maximum of one space can be required. In practice, many Sacramento lots qualify for the exemption.
Smaller units get a break: impact fees are waived for ADUs under 750 sq ft, and recent law reduced school fees for units under 500 sq ft. You'll still have design, plan-check, permit and utility-connection costs — we itemize them all.
For standard ADUs, statewide law has removed the owner-occupancy requirement in most cases, meaning you generally don't have to live on the property to rent one out. A JADU is the exception — it still requires you to occupy either the junior unit or the main house. We confirm what applies to your situation.
The rules above are the framework; applying them to your specific lot — utilities, easements, trees, fire setbacks and local overlays — is where a good design-build team earns its keep. We handle feasibility, plans, engineering, and city submittals so you don't have to decode any of it. Start with a free consultation.
Tell us about your property — we'll map out your options and a ballpark budget.
California caps review at 60 days once your application is complete, with a 15-business-day completeness check first. A City of Sacramento pre-approved plan is fastest — plan check in a few days and permitting around 30 days. Custom designs take longer.
Just 4 feet from the rear and side property lines. And a garage or structure conversion that keeps the same footprint needs no new setback at all, even close to the line. Front setbacks follow your zone; we confirm the specifics for your lot.
For a standard ADU, generally no — statewide law removed owner-occupancy in most cases, so you can rent it out. A Junior ADU (JADU) is the exception and does require you to live in the JADU or the main house.
Usually not in Sacramento. No new parking is required within a half-mile of transit or for garage/interior conversions; otherwise at most one space. Many lots qualify for the exemption — we check yours.
The state law sets a floor that all cities must meet, but local specifics (overlays, historic districts, fire setbacks, utilities) vary between Sacramento, Elk Grove, Roseville, Folsom and others. We confirm the current requirements for your exact jurisdiction.
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