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][3][4][5]
Yes — Roseville allows ADUs. A detached ADU can typically be up to 850 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][3][4][5]
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 [6][7][8][9]
An ADU permit in Roseville goes through a ministerial, by-right review. Typical 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.
| 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 750 sq ft or less of interior livable space (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 [10][11][12][13]
Building an ADU in Roseville typically costs $170,000-$400,000 ($250-$500 per sq ft); a garage conversion runs $90,000-$200,000.
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| Average Build Cost | $170,000-$400,000 |
| Cost per Sq Ft | $250-$500 |
| Garage Conversion | $90,000-$200,000 |
| Prefab ADU (Installed) | $170,000-$340,000 |
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Rental Income Potential [14]
A 2-bedroom ADU in Roseville rents for around $2,500-$2,900/mo, an estimated 7-14% gross annual return.
| Avg Rent (1 Bedroom) | $2,050-$2,350/mo |
| Avg Rent (2 Bedroom) | $2,500-$2,900/mo |
| Short-Term Rental | No — state law requires ADU rentals to run longer than 30 days (Gov. Code 66323(e)). Roseville's short-term rental chapter (Ch. 4.25 as of July 2026: no STR permits for ADUs or JADUs) — confirm with Planning. |
| Est. Annual ROI | 7-14% gross annual return |
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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
- Before you design, ask Planning for the current version of Ch. 19.60 and whether the post-HCD amendments have been adopted; on 9/20/2026 none of the city's ADU pages could be read from outside
- 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 (66323(a)(2))
- Keep a new detached unit at 750 sq ft or less to avoid impact fees entirely (Gov. Code 66311.5); above that, fees scale with the size of your main home
- Convert existing space where possible: conversions carry no setback or parking requirements (Gov. Code 66314(d)(7), 66322)
- Cost basis: build, per-sq-ft, garage and prefab ranges are the Sacramento-region figures from four 2026 contractor guides (April-June 2026); rents are HUD Small Area FMRs for ZIPs 95661, 95678 and 95747 (FY2026 and the FY2027 schedule effective Oct 1, 2026) — gross rents including utilities, so asking rents for a small ADU may run lower
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
- Gov. Code 66314 — Local ADU ordinance standards (setbacks, parking, no minimum lot size) | California Legislative Information state_statute — Accessed 2026-09-20
- Gov. Code 66321 — ADU size and height floors (SB 543) | California Legislative Information state_statute — Accessed 2026-09-20
- Gov. Code 66323 — Units a city must approve (SB 543) | California Legislative Information state_statute — Accessed 2026-09-20
- 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
- Gov. Code 66317 — Ministerial approval, 60-day clock, deemed approval (SB 543) | California Legislative Information state_statute — Accessed 2026-09-20
- How Much Does It Cost to Build an ADU in Sacramento (updated April 28, 2026) | Good Life Construction industry — Accessed 2026-09-19
- How Much Does an ADU Cost in Sacramento? (updated June 12, 2026) | Upside ADU industry — Accessed 2026-09-19
- How Much Does an ADU Cost in Sacramento in 2026? | ADU Wizard industry — Accessed 2026-09-19
- Garage Conversion ADU in Sacramento: Complete 2026 Guide | Result Construction industry — Accessed 2026-09-19
- HUD Small Area Fair Market Rents FY2026 and FY2027, ZIPs 95661/95678/95747 (Sacramento--Roseville--Arden-Arcade HUD Metro FMR Area) Government Data — Accessed 2026-09-20
Frequently Asked Questions
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