Ione Junior Additional Dwelling Unit Contractor
Up to 500 sqft of independent living built inside your existing Ione home: converted basement, bedroom suite, attic, or attached garage. Faster permits, lower cost, no impact fees under California state law.
JADUs Carved Out of Existing Ione Homes
The Junior Additional Dwelling Unit is the fastest, cheapest path to adding a second residence on your Ione property. Where a standard ADU is a new structure built on the lot, a JADU is carved out of the home you already own: up to 500 square feet of independent living converted from an existing bedroom suite, basement, attic, or attached garage. Same kitchen privacy, separate entrance, no detached construction required.
California state law (Government Code 65852.22) requires every city, Ione included, to permit one JADU on every single-family residential lot. The conversion must include an efficiency kitchen (sink, refrigerator, and at least one cooking appliance), can share a bathroom with the primary residence or have its own, and requires a separate exterior entrance.
What makes JADUs especially compelling for Ione homeowners: no impact fees, no separate utility meters required, and no setback requirements because the unit is inside the existing building envelope. The permit path is faster than a standard ADU, the construction is shorter, and the budget is a fraction of what a detached ADU costs.
ADC Construction handles the full scope: zoning verification, architectural design, structural modifications, kitchen and bathroom installation, electrical and plumbing rough-in, finish carpentry, and Ione permits start to finish. The owner-occupancy requirement (one of the units must be owner-occupied) is the only meaningful constraint, and Adam walks you through the deed restriction process with the city as part of the contract.
Common JADU configurations we build in Ione: converted master bedroom suite (existing bedroom + private bath becomes a JADU with kitchenette added), basement conversion (finished basement with separate entrance carved out as a JADU), attached garage conversion (single-bay garage attached to the house converted to a livable JADU), and second-story attic conversion (where structural and headroom conditions allow).
Adam earned his General B contractor’s license after serving in the US Army, and built ADC Construction in 2022 on one principle: treat every property like it’s your own home. Call (209) 200-5302 or request a free on-site quote. See finished work in our project gallery, including JADU conversions, basement remodels, and bedroom-suite carve-outs across the Ione region. We serve Ione, Sacramento, Folsom, Lodi, Stockton, and 29 more cities within 30 miles of our Lodi office.
Ione sits in the Amador County foothills where the Valley starts to climb, an old Gold Rush town with a real mix of housing. In town you have historic homes and settled neighborhoods on city water, and out toward the ranch land the parcels run on well and septic. Which one you have shapes the JADU. On an older in-town Ione home we look carefully at how the existing structure was built, since a converted bedroom suite or garage in a century-old house can turn up dated wiring or framing that needs attention before it becomes livable second-residence space. On a rural parcel we confirm the septic can carry the added kitchen and bathroom load and the well is sized for a second household before we design anything.
Ione summers run hot in that foothill pocket and the winters bring cold mornings, so we build the conversion to handle both, proper insulation, tight windows and doors, and right-sized heating and cooling so the JADU is comfortable through the whole year rather than just the mild months. Where a converted garage or spare room opens toward the dry grassland on Ione’s edges, we keep the exterior details clean and use fire-conscious materials, because this stretch of Amador County carries genuine fire risk every summer. Whether your JADU comes out of an old town home or a ranch-country garage, we permit it through Amador County and carry it from plan check to final inspection so the paperwork is handled.
Six Reasons Ione Homeowners Pick a JADU Over a Full ADU
Lower Cost
The budget gap is the whole appeal. A JADU converts space you already own, so you skip the foundation, the framing, and the roof that a detached ADU needs.
Faster Permits
State law gives JADU applications a 60-day approval ministerial path with the Ione. No discretionary review.
No Impact Fees
California exempts JADUs from utility connection fees, school impact fees, and most development impact fees.
Shared Utilities
No separate water, electrical, or sewer meters required. Utility tap costs drop dramatically.
Shorter Build
JADUs typically complete in 8-16 weeks of construction versus 4-8 months for a detached ADU. Less disruption.
Stack With an ADU
State law allows one JADU AND one ADU on the same Ione lot. Doubles your rental footprint on the same property.
JADU Construction Across the Ione Region
Same craft standard on every JADU within 30 miles of Lodi.
Ione JADU Questions
How much does a JADU cost in Ione, CA?
The cost of a Ione JADU depends almost entirely on what the space already has. A spare bedroom that only needs a kitchenette and its own entry is the least involved. A basement with its own bathroom means new plumbing runs, egress windows, and often ceiling work. An attached garage is the biggest lift, since it needs insulation, a floor system, and windows to pass as living space. Adam measures the room on the walkthrough and ADC puts every line in writing before anyone commits. ADC provides itemized quotes within 48 hours of the on-site walk.
What’s the difference between a JADU and an ADU in Ione?
An ADU is a new dwelling, detached or attached, up to 1,200 sqft, with its own kitchen, bathroom, and full utility connections. A JADU is carved out of your existing home, capped at 500 sqft, can share a bathroom with the main house, and requires no separate utility meters. JADUs are cheaper, faster, and have no impact fees. ADUs add more rentable space and more equity value. Many Ione homeowners build both on the same lot.
Do you handle the Ione JADU permits?
Yes. JADUs follow a ministerial 60-day approval path through the the local Planning Department. We submit plans, manage plan check, pull the building permit, coordinate plumbing/electrical/mechanical inspections, and walk through final sign-off. We also prepare the owner-occupancy deed restriction the city requires.
Can I rent out a JADU in Ione?
Yes, but with one caveat: California law requires the owner to live in either the main residence or the JADU. You cannot rent out both. Most Ione JADU clients continue living in the main home and rent the JADU as an in-law suite, separate apartment for an adult child, or long-term tenant rental. Short-term rentals (Airbnb) are restricted under local ordinance.
How long does an Ione JADU build take?
Plan on 4-6 weeks for permits and plans, then 8-16 weeks of construction depending on scope. A bedroom-to-JADU conversion is the fastest (8-10 weeks building). A basement or garage conversion runs longer (12-16 weeks building). We provide a realistic schedule with your quote and hold to it.
My Ione home is old. Does that make a JADU harder?
Not harder, just something we plan for. Ione has a lot of historic and older in-town homes, and carving a JADU out of a century-old house sometimes turns up dated wiring, plumbing, or framing that needs attention before the space is a proper second residence. We check the existing structure before we design the conversion, and if the electrical or plumbing needs updating to safely carry a second kitchen we scope it up front. Done that way, an older Ione home makes a characterful, comfortable JADU rather than a project full of mid-build surprises.
Does fire code affect a JADU on Ione’s rural edges?
It can where the parcel sits near open grassland, and we build for it. This stretch of Amador County carries real fire risk every summer, so when a garage or bedroom conversion opens toward the dry grass, we keep the exterior details clean and use fire-conscious materials on the work that touches the outside. A JADU kept entirely inside the existing walls has less exterior impact, but where we do reach the outside of the home we build it to hold up to ember exposure during the dry season. We confirm what applies to your specific parcel before we start.
Ione JADU Built to Last. Answered After Move-In.
Ready to start your Ione JADU project? Call Adam directly or request a free on-site quote. We walk the property, talk through conversion options, and quote it transparently.