How Much Does an ADU Cost in Loomis?
Updated June 12, 2026 · Upside ADU
Quick answer
A detached ADU in Loomis costs about $131,250–$453,600 turnkey in 2026, or roughly $263–$378 per square foot (design, permits, and construction included). A 750 sq ft 2-bedroom unit averages $196,875–$283,500; garage conversions and Junior ADUs cost less. Loomis runs roughly 5% above the central-Sacramento baseline, driven mostly by site conditions and finish expectations in this submarket.
What does each ADU type cost in Loomis?
Price is driven first by type, because type decides how much new structure you build. The ranges below are Loomis-specific for 2026 — the regional market adjusted for this submarket's higher build costs.
Loomis ADU cost by type — 2026 turnkey ranges
| ADU type | Typical size | $ / sq ft | Turnkey range |
|---|---|---|---|
| Detached ADU | 500–1200 sq ft | $263–$378 | $131,250–$453,600 |
| Garage Conversion ADU | 380–620 sq ft | $189–$294 | $71,820–$182,280 |
| Attached ADU | 450–850 sq ft | $252–$357 | $113,400–$303,450 |
| Junior ADU (JADU) | 220–500 sq ft | $210–$336 | $46,200–$168,000 |
| Multigenerational ADU | 600–1200 sq ft | $263–$389 | $157,500–$466,200 |
See also:Upside's published pricing · ADU builder in Loomis
What does an ADU cost per square foot in Loomis?
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 Loomis pricing.
Loomis detached ADU cost by size (2026)
| Size | Typical config | $ / sq ft | Estimated turnkey |
|---|---|---|---|
| 400 sq ft | Studio / JADU | $263–$378 | $105,000–$151,200 |
| 600 sq ft | 1 bedroom | $263–$378 | $157,500–$226,800 |
| 750 sq ft | 2 bedroom | $263–$378 | $196,875–$283,500 |
| 1000 sq ft | 2–3 bedroom | $263–$378 | $262,500–$378,000 |
What drives ADU cost up or down in Loomis?
Loomis runs roughly 5% above the central-Sacramento baseline, driven mostly by site conditions and finish expectations in this submarket.
Loomis lots: Acre-plus semi-rural parcels give plenty of room for spacious, private detached ADUs and guest houses.
Local permitting: Loomis reviews ADUs through the Town of Loomis with Placer County building support. Rural-residential zoning means larger minimum lots, frequent septic and well systems, and tree-protection review — all of which we scope before pricing a detached build.
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 Loomis 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 Loomis rent for, and when does it pay back?
A typical Loomis ADU rents for $1,700–$2,700 a month in 2026. Loomis's premium rural-residential character supports higher-end finishes and strong resale value, so the play leans toward guest homes and value-add over pure cash flow. 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 Loomis ADU cost compares across the region
Loomis 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 Loomis-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)
- Town of Loomis / Placer County Building Division — permits & fees — Town of Loomis / Placer County Building Division