A junior ADU in Sacramento is no more than 500 sq ft inside the single-family home. Owner occupancy applies when it shares the home's sanitation facilities, and the City path counts junior ADUs within its two-unit limit.
Last verified 2026-10-18. Rules change; the City of Sacramento building desk has the final word.
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Sacramento City Code 17.228.105(B)(1)(a) includes junior ADUs in the City path's two-unit limit. The City's ADU Resource Center also describes a separate state path that can pair a junior ADU with a converted ADU and a new detached ADU. The two sets of standards cannot be mixed on one lot.
City of Sacramento ADU Resource Center, Step 1; City Code 17.228.105(A)-(C)| Type | Est. all-in cost | Est. rent |
|---|---|---|
| Junior ADU (inside the house) | $45,000-$80,000 | $1,175-$1,425/mo |
Estimates for a first conversation, not bids or appraisals. Source: LotUpside price book sac-2026-10.
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Only when the junior ADU shares sanitation facilities with the home. Gov. Code 66333(b), as amended by AB 1154, removes the owner-occupancy requirement when it has separate sanitation facilities; the City's ADU zoning review form CDD-0009 says the same.
Gov. Code 66333(d) treats an enclosed attached garage as part of the single-family residence for a junior ADU. The same section requires the junior ADU to remain within the residence's walls.
No. Gov. Code 66333(g) requires a junior ADU rental term longer than 30 days, as the City of Sacramento's ADU zoning review form CDD-0009 also notes.
Neither. It is a screening from public records, not professional advice, and not a survey, soils report, appraisal, loan offer or permit; every number is an estimate. A licensed designer confirms the final plan, and your city or county gives final approval.