Folsom, CA · Sacramento County
Junior ADU (JADU) in Folsom
Upside ADU builds junior adu (jadu)s in Folsom, Sacramento County, for a $1,000 deposit with transparent fixed pricing and inspection-tied payments. A typical Folsom junior adu runs $48,400–$176,000 all-in, and we permit it through the City of Folsom Community Development Department end to end.
Folsom rules that affect a junior adu
A junior ADU stays inside your existing Folsom home (up to 500 sq ft) with an efficiency kitchen and its own entrance, so it skips most setback and site-work questions. Note that JADUs carry an owner-occupancy requirement, which we confirm against Sacramento County rules.
Local permitting: Folsom's Community Development Department applies 4 ft side/rear setbacks and a 16 ft height cap, but the city's hillside and master-planned (Folsom Ranch) lots often add grading, retaining, or fire-zone requirements we scope up front. HOA review is common south of Highway 50.
That's the junior adu-specific picture. For the full Sacramento County rulebook — every setback, height, and owner-occupancy detail — see our Sacramento-region ADU rules guide, and learn how the build type works statewide on our junior adu (jadu) page.
Why Folsom homeowners pick Upside
- $1,000 deposit — the CA legal max
- Inspection-tied milestone payments
- We know the City of Folsom Community Development Department process
- Transparent, all-in Folsom pricing
- Property-manager referral when you rent
Folsom junior adu cost snapshot
A Junior ADU is up to 500 sq ft created within the walls of your existing house — often a converted bedroom with an efficiency kitchen. It's the lowest-cost way to add a legal rental, and you can pair one with a detached ADU on the same lot. In the Sacramento County market that prices out to about $220–$352 per square foot, or $48,400–$176,000 for a finished, permitted unit. A typical Folsom junior adu rents for $1,900–$3,000 a month.
| Size | Typical use | Folsom all-in cost (2026) |
|---|---|---|
| 220 sq ft | Studio / 1-bed, max cash-on-cash | $48,400–$77,440 |
| 360 sq ft | 1–2 bed, most popular | $79,200–$126,720 |
| 500 sq ft | 2–3 bed / multigen, max value | $110,000–$176,000 |
Dial in your own number with the ADU cost calculator.
Estimate your ADU
Ballpark 2026 turnkey cost, financing, and rental return for your area.
Estimated turnkey cost
$220–$352 / sq ft · incl. design, permits & construction
Estimates only — 2026 regional ranges, not a bid. Your real price depends on site conditions, finishes, and your lot. We confirm with a free feasibility check.
Junior ADU projects in Folsom
Folsom feasibility starts with the topo: Empire Ranch and American River Canyon lots often need a grading and retaining plan before a slab can be set. South of Highway 50, the Folsom Ranch HOA review gets added on top of the city's. Every junior adu is fixed-price, funded on inspection-passed milestones, and backed by our written guarantee.
Browse finished builds and specs in our ADU project gallery.
Junior ADU (JADU) in Folsom — FAQs
A junior adu (jadu) in Folsom typically runs $48,400–$176,000 turnkey in 2026, based on $220–$352 per square foot for the Sacramento County market. We confirm your exact number with a free feasibility check.
Folsom junior adu (jadu) permits are handled by the City of Folsom Community Development Department. Folsom's Community Development Department applies 4 ft side/rear setbacks and a 16 ft height cap, but the city's hillside and master-planned (Folsom Ranch) lots often add grading, retaining, or fire-zone requirements we scope up front. HOA review is common south of Highway 50. We prepare and submit the full package and manage inspections.
A junior adu (jadu) in Folsom rents for about $1,900–$3,000 a month in 2026 depending on size and finish. Folsom's job base and schools keep rents and resale values at the top of Sacramento County, so even higher site-work costs pencil out on appraised-value lift and premium rent.
A Junior ADU is a unit up to 500 sq ft created inside your existing home's footprint, with its own entrance and an efficiency kitchen. JADUs can share a bathroom with the main house and, unlike standard ADUs, may carry an owner-occupancy requirement.
Junior ADU (JADU) near Folsom
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