Roseville allows ADUs ministerially with no parking for conversions and an AB 1332 preapproved plan program, but its ordinance (No. 6829, 2024) was found out of compliance with state ADU law by HCD in a January 6, 2026 findings letter, and amendments are moving through the city council. Where local rules are stricter than state law — such as unit counts or the 850/1,000 sq ft caps — state standards prevail, so verify current requirements with the Planning Division before designing.
Zoning & Size Requirements [1][2]
Yes — Roseville allows ADUs. A detached ADU can typically be up to 1,000 sq ft under current California and Roseville zoning rules.
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| Allowed Zones | CMU, R1, RS, R2, R3, and RMU zones with an existing primary residence; NC, CC, GC, HC, and CBD commercial zones if an existing residence has an approved CUP |
| Max Size (Detached) | 850 sq ft (studio/1BR) or 1,000 sq ft (2+BR) per city handout — the state floor; minimum 150 sq ft |
| Max Size (Attached) | 850 sq ft (studio/1BR) or 1,000 sq ft (2+BR); state law also guarantees up to 50% of the primary dwelling |
| Max Size (JADU) | 500 sq ft |
| Max Height | New ADUs: standards applicable to the primary residence apply per city handout; state law guarantees at least 16 ft detached (18 ft near major transit or on multifamily lots) and 25 ft attached. Detached ADUs on multifamily lots: 16 ft per handout |
| Max Units | City handout: 1 ADU per single-family lot, plus a JADU when the detached new-construction ADU has 4-ft setbacks; multifamily lots: 2 detached ADUs + interior conversions up to 25% of units. State law (Gov. Code 66323) guarantees more combinations — this is part of HCD's compliance review |
Setback Requirements [1][2]
Roseville requires a rear setback of about 4 ft for a detached ADU, and parking requirements vary by unit size or location. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | 4 ft for new construction; none for conversions of existing structures (including same-footprint rebuilds) |
| Side Setback | 4 ft for new construction; none for conversions |
| Front Setback | Underlying zone standards apply — confirm with Roseville Planning at (916) 774-5276 |
| Parking Required | Conversions: none required. New structures: 1 space per unit or per bedroom (whichever is less), waived within 1/2 mile of transit, in Historic Old Town, for additions, or where permit-parking areas exclude ADU occupants; tandem/setback parking OK; no replacement parking for garage conversions |
| Owner Occupancy | Not required for ADUs. JADUs: city handout requires owner-occupancy; under AB 1154 (2026) enforceable only where the JADU shares a bathroom with the main home |
| Min Lot Size | No minimum lot size (density and lot-size limits do not apply to ADUs) |
Permit Process & Fees [3][4][5]
An ADU permit in Roseville typically costs Per the city's Accessory Dwelling Units Fee Policy — confirm current amounts with Development Services at (916) 774-5332 and takes 60-day state-mandated review; deemed approved if the city misses the deadline (SB 543, Jan 2026), through a ministerial, by-right review.
| Approval Process | Ministerial review through Development Services; no discretionary hearings for compliant projects |
| Review Timeline | 60-day state-mandated review; deemed approved if the city misses the deadline (SB 543, Jan 2026) |
| Permit Fees | Per the city's Accessory Dwelling Units Fee Policy — confirm current amounts with Development Services at (916) 774-5332 |
| Impact Fees | Waived for ADUs under 750 sq ft (state law); see the city ADU Fee Policy for larger units |
| Plan Check | Standard building plan check; preapproved master plans reduce review time — confirm timing with the Building Division |
| Pre-Approved Plans | Yes — Preapproved ADU Plans program per AB 1332 (master plans preapproved for site-specific permit submittal) |
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Construction Costs [6]
Building an ADU in Roseville typically costs $150,000-$300,000 ($250-$400 per sq ft); a garage conversion runs $80,000-$150,000.
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| Average Build Cost | $150,000-$300,000 |
| Cost per Sq Ft | $250-$400 |
| Garage Conversion | $80,000-$150,000 |
| Prefab ADU (Installed) | $120,000-$250,000 |
Finance Your ADU Project
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Rental Income Potential [7][8]
A 2-bedroom ADU in Roseville rents for around $2,000-$2,350/mo, an estimated 6-9% annual return.
| Avg Rent (1 Bedroom) | $1,700-$2,000/mo |
| Avg Rent (2 Bedroom) | $2,000-$2,350/mo |
| Short-Term Rental | No — rental terms must exceed 30 days; STR permits are not issued for ADUs or JADUs (Ch. 4.25) |
| Est. Annual ROI | 6-9% annual return |
Explore Prefab ADU Options
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Recent Law Changes
What's Changed Recently
- HCD findings letter (Jan 6, 2026): Ordinance No. 6829 (June 2024) found noncompliant with state ADU law; city response was due Feb 5, 2026
- Roseville Planning Commission recommended council approval of ADU ordinance amendments in 2026 to address the HCD findings
- AB 1332 preapproved ADU master plan program launched (required by Jan 1, 2025)
- SB 543 (Jan 2026): ADU applications deemed approved if the city fails to act within 60 days
Tips for Building an ADU in Roseville
- Roseville's ordinance is being amended after HCD's January 2026 findings — check the latest rules with Planning before finalizing your design
- If a local standard is stricter than state ADU law (Gov. Code 66310-66342), state law controls — an 800 sq ft, 16-ft detached ADU with 4-ft setbacks must be approved
- Convert existing space where possible: conversions carry no setback or parking requirements
- Pair a JADU with a code-compliant detached ADU to get two rentable units on one single-family lot
ADU Builders in Roseville
Looking for an ADU builder in Roseville? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Roseville homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- ADU Requirements Handout | City of Roseville Planning Division Planning Department — Accessed 2026-07-10
- Chapter 19.60 Accessory Dwelling Units | Roseville Zoning Ordinance Municipal Code — Accessed 2026-07-10
- Preapproved ADU Plans (AB 1332) | City of Roseville Planning Department — Accessed 2026-07-10
- Accessory Dwelling Units Fee Policy | City of Roseville Planning Department — Accessed 2026-07-10
- HCD Review of Roseville's ADU Ordinance — Findings (Jan 6, 2026) state_agency — Accessed 2026-07-10
- Roseville, CA ADU Information | GatherADU industry — Accessed 2026-07-10
- Average Rent in Roseville, CA | RentCafe Market Data — Accessed 2026-07-10
- Average Rental Price in Roseville, CA | Zillow Rental Manager Market Data — Accessed 2026-07-10
Frequently Asked Questions
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