Folsom Junior Additional Dwelling Unit Contractor
Up to 500 sqft of independent living built inside your existing Folsom 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 Folsom Homes
The Junior Additional Dwelling Unit is the fastest, cheapest path to adding a second residence on your Folsom 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, Folsom 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 Folsom 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 Folsom 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 Folsom: 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 Folsom region. We serve Folsom, Sacramento, Lodi, Stockton, and 29 more cities within 30 miles of our Lodi office.
Folsom’s newer master-planned neighborhoods, Empire Ranch, Broadstone, and the developments up toward the lake, come with substantial homes and, almost always, an HOA. That architectural review layer is the piece a lot of contractors fumble on a Folsom conversion. A JADU carved out of the interior rarely triggers much HOA concern, but the moment the work touches the exterior, a new entrance door, a garage door infill, or an added window, the association wants to see it. We prepare the architectural submittal and run it in parallel with the city permit so both approvals land in the same window and the HOA never stalls your project. Knowing which Folsom communities care about which details up front is half the battle, and we have run those tracks before.
Many of these Folsom homes carry solar and sit on granite lots with real grade, so we plan the conversion around both. Tying a JADU’s added electrical load in with an existing solar setup takes coordination so nothing gets thrown out of balance, and a garage or lower-level conversion on a sloped granite lot has to account for how the space drains and where a compliant entrance fits the grade. We insulate and finish the conversion to the standard these homes expect, put in right-sized heating and cooling for the foothill climate, and carry the ministerial JADU permit through the City of Folsom start to finish. The result is a second residence that matches the quality of the main house rather than reading as a bolted-on afterthought.
Six Reasons Folsom Homeowners Pick a JADU Over a Full ADU
Lower Cost
A JADU carries a fraction of the budget of a detached ADU because you are working inside walls that already exist. Same rental potential, far less structure to build.
Faster Permits
State law gives JADU applications a 60-day approval ministerial path with the Folsom. 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 Folsom lot. Doubles your rental footprint on the same property.
JADU Construction Across the Folsom Region
Same craft standard on every JADU within 30 miles of Lodi.
Folsom JADU Questions
How much does a JADU cost in Folsom, CA?
What a Folsom JADU costs comes down to which space you are converting and how much has to change. A bedroom suite with a kitchenette and a shared bathroom is the simplest version, since the room, walls, and roof are already there. A basement conversion with a private bathroom costs more because you are adding plumbing, egress, and often ceiling height or moisture work. An attached garage conversion sits highest, since that space needs insulation, a floor system, and windows before it reads as living space. Adam walks the actual room, and ADC sends an itemized written quote within 48 hours so you can see every line before deciding. ADC provides itemized quotes within 48 hours of the on-site walk.
What’s the difference between a JADU and an ADU in Folsom?
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 Folsom homeowners build both on the same lot.
Do you handle the Folsom 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 Folsom?
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 Folsom 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 Folsom 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.
Will my Folsom HOA get in the way of a JADU?
Usually not, as long as it is handled right. A JADU carved out of the interior rarely raises much HOA concern. The review comes into play when the work touches the exterior, a new entrance door, a garage door infill, or an added window, which the association wants to approve. We prepare the architectural submittal and run it in parallel with the city permit so both approvals land in the same window and the HOA never stalls your build. We have worked the Folsom communities and know which associations care about which details, so we get ahead of it instead of reacting to it.
My Folsom home has solar. Does that complicate a JADU?
It just means coordination, and we plan for it. Adding a JADU brings a second kitchen circuit and more electrical load, so if your Folsom home already runs solar we make sure the new load ties in cleanly without throwing your system out of balance. On a granite lot with grade, a garage or lower-level conversion also has to account for how the space drains and where a compliant entrance fits the slope. We walk all of that up front and scope it into the plan so the conversion matches the quality of the main house rather than fighting the systems already on it.
Folsom JADU Built to Last. Answered After Move-In.
Ready to start your Folsom JADU project? Call Adam directly or request a free on-site quote. We walk the property, talk through conversion options, and quote it transparently.