How Much Does an ADU Cost in Auburn?
Updated June 12, 2026 · Upside ADU
Quick answer
A detached ADU in Auburn costs about $130,000–$449,280 turnkey in 2026, or roughly $260–$374 per square foot (design, permits, and construction included). A 750 sq ft 2-bedroom unit averages $195,000–$280,800; garage conversions and Junior ADUs cost less. Auburn runs roughly 4% above the central-Sacramento baseline, driven mostly by site conditions and finish expectations in this submarket.
What does each ADU type cost in Auburn?
Price is driven first by type, because type decides how much new structure you build. The ranges below are Auburn-specific for 2026 — the regional market adjusted for this submarket's higher build costs.
Auburn ADU cost by type — 2026 turnkey ranges
| ADU type | Typical size | $ / sq ft | Turnkey range |
|---|---|---|---|
| Detached ADU | 500–1200 sq ft | $260–$374 | $130,000–$449,280 |
| Garage Conversion ADU | 380–620 sq ft | $187–$291 | $71,136–$180,544 |
| Attached ADU | 450–850 sq ft | $250–$354 | $112,320–$300,560 |
| Junior ADU (JADU) | 220–500 sq ft | $208–$333 | $45,760–$166,400 |
| Multigenerational ADU | 600–1200 sq ft | $260–$385 | $156,000–$461,760 |
See also:Upside's published pricing · ADU builder in Auburn
What does an ADU cost per square foot in Auburn?
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 Auburn pricing.
Auburn detached ADU cost by size (2026)
| Size | Typical config | $ / sq ft | Estimated turnkey |
|---|---|---|---|
| 400 sq ft | Studio / JADU | $260–$374 | $104,000–$149,760 |
| 600 sq ft | 1 bedroom | $260–$374 | $156,000–$224,640 |
| 750 sq ft | 2 bedroom | $260–$374 | $195,000–$280,800 |
| 1000 sq ft | 2–3 bedroom | $260–$374 | $260,000–$374,400 |
What drives ADU cost up or down in Auburn?
Auburn runs roughly 4% above the central-Sacramento baseline, driven mostly by site conditions and finish expectations in this submarket.
Auburn lots: North Auburn and Christian Valley parcels are larger but sloped; Old Town lots are tighter with historic-area considerations.
Local permitting: Auburn ADUs permit through the City of Auburn or Placer County depending on whether the parcel is incorporated. Foothill lots commonly involve slope, access, and fire-zone (WUI) requirements, so site evaluation and ignition-resistant detailing get scoped before the bid.
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 Auburn budget — get an exact, all-in number for your lot.
Free feasibility check, no commitment. We confirm site conditions, permit fees, and your build range before you sign anything.
What will an ADU in Auburn rent for, and when does it pay back?
A typical Auburn ADU rents for $1,500–$2,400 a month in 2026. Gold Country charm and tourism demand make Auburn viable for both long-term and furnished rentals, with foothill character supporting solid resale value. 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 Auburn ADU cost compares across the region
Auburn 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 Auburn-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 Auburn / Placer County Building Division — permits & fees — City of Auburn / Placer County Building Division