How Much Does an ADU Cost in Roseville?
Updated June 12, 2026 · Upside ADU
Quick answer
A detached ADU in Roseville costs about $135,000–$466,560 turnkey in 2026, or roughly $270–$389 per square foot (design, permits, and construction included). A 750 sq ft 2-bedroom unit averages $202,500–$291,600; garage conversions and Junior ADUs cost less. Roseville runs roughly 8% above the central-Sacramento baseline, driven mostly by site conditions and finish expectations in this submarket.
What does each ADU type cost in Roseville?
Price is driven first by type, because type decides how much new structure you build. The ranges below are Roseville-specific for 2026 — the regional market adjusted for this submarket's higher build costs.
Roseville ADU cost by type — 2026 turnkey ranges
| ADU type | Typical size | $ / sq ft | Turnkey range |
|---|---|---|---|
| Detached ADU | 500–1200 sq ft | $270–$389 | $135,000–$466,560 |
| Garage Conversion ADU | 380–620 sq ft | $194–$302 | $73,872–$187,488 |
| Attached ADU | 450–850 sq ft | $259–$367 | $116,640–$312,120 |
| Junior ADU (JADU) | 220–500 sq ft | $216–$346 | $47,520–$172,800 |
| Multigenerational ADU | 600–1200 sq ft | $270–$400 | $162,000–$479,520 |
See also:Upside's published pricing · ADU builder in Roseville
What does an ADU cost per square foot in Roseville?
Smaller units cost more per foot — fixed costs like a kitchen, bath, utility hookup, and permit spread across fewer square feet. Here is a detached build at Roseville pricing.
Roseville detached ADU cost by size (2026)
| Size | Typical config | $ / sq ft | Estimated turnkey |
|---|---|---|---|
| 400 sq ft | Studio / JADU | $270–$389 | $108,000–$155,520 |
| 600 sq ft | 1 bedroom | $270–$389 | $162,000–$233,280 |
| 750 sq ft | 2 bedroom | $270–$389 | $202,500–$291,600 |
| 1000 sq ft | 2–3 bedroom | $270–$389 | $270,000–$388,800 |
What drives ADU cost up or down in Roseville?
Roseville runs roughly 8% above the central-Sacramento baseline, driven mostly by site conditions and finish expectations in this submarket.
Roseville lots: West Roseville and Fiddyment Farm offer newer large lots, while Diamond Oaks and central Roseville have established trees and tighter rear yards that we site around.
Local permitting: Roseville reviews ADUs at its own Development Services counter under Placer County rules — a different submittal path than the City of Sacramento. Expect 4 ft side/rear setbacks, a 16 ft height limit, and HOA architectural review in master-planned tracts like Fiddyment Farm and Sun City.
The single biggest cost lever is size: keeping a unit under 750 sq ft exempts it from local impact fees. Site conditions (slope, soil, utility runs) and finish level move the rest.
Know your Roseville budget — get an exact, all-in number for your lot.
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What will an ADU in Roseville rent for, and when does it pay back?
A typical Roseville ADU rents for $1,800–$2,900 a month in 2026. Top-rated schools and high owner-occupancy push Roseville toward premium long-term rentals and multigenerational use; value-lift at resale is among the strongest in Placer County. Run your specific numbers with the calculator below, or see the full payback math in the ROI guide.
Tools & guides:ADU cost calculator · ROI & rent estimator · ADU rental income & ROI guide
How Roseville ADU cost compares across the region
Roseville sits in the Placer County market. The regional baseline is central Sacramento; foothill and estate submarkets (El Dorado Hills, Granite Bay, Folsom) run highest, while Galt, Woodland, and Citrus Heights run lowest. For the full regional cost breakdown and methodology, see our Sacramento ADU cost guide, or compare every city on the ADU cost by city index.
Figures are 2026 Roseville-area market estimates, not a fixed quote. Your exact price depends on your lot, design, and finish level — we confirm it with a free feasibility check.
Sources & references
- Accessory Dwelling Units — official guidance — California Dept. of Housing & Community Development (HCD)
- City of Roseville Development Services — permits & fees — City of Roseville Development Services