Junior Accessory Dwelling Units
Junior ADU Construction in Orange County
A Junior ADU converts existing space inside your home into a self-contained unit — an efficient, lower-cost path to added income or multigenerational living.
A Junior Accessory Dwelling Unit (JADU) is a unit of up to 500 square feet created entirely within the walls of an existing single-family home. Unlike a full ADU, a JADU does not require a separate utility connection, making it a faster and more affordable option for many homeowners.
Common JADU conversions include converting a bedroom suite, a finished basement, or an attached garage into a self-contained living space with its own entrance, kitchenette, and bathroom. Main Street Kitchen & Flooring manages the entire process — from feasibility through final inspection.
JADUs are permitted under California state law and are subject to local city guidelines. Our team is familiar with JADU requirements across Orange County cities and will confirm what is allowed on your specific property before any work begins.
Request a JADU EstimateWhat Makes a JADU Different from a Full ADU?
Size Limit: 500 Sq Ft
JADUs are capped at 500 square feet and must be created within the existing structure — no new additions allowed.
Separate Entrance Required
The JADU must have its own exterior door, though it may also connect to the main home through an interior door.
Efficiency Kitchen Allowed
A JADU kitchenette can share the main home's water heater and electrical panel — no separate utility meter required.
Owner-Occupancy Requirement
California law requires the property owner to occupy either the main home or the JADU. This distinguishes JADUs from full ADUs.
Our JADU Build Process
Feasibility Review
We assess your existing floor plan, identify the best space for conversion, and confirm compliance with local JADU ordinances.
Design & Permit Plans
Our team prepares permit-ready drawings showing the new entrance, kitchenette, bathroom, and any structural modifications.
Permit Submission
We submit to your city's building department and manage the plan-check process through approval.
Construction
Our crews handle framing, plumbing, electrical, insulation, drywall, flooring, cabinetry, and all finish work.
Final Inspection
We schedule and pass all required inspections, delivering a fully permitted JADU ready for occupancy.
Junior ADU FAQs
How much does a JADU cost to build?
JADU costs typically range from $50,000 to $150,000 depending on the scope of conversion, finishes selected, and permit fees in your city.
Can I rent out a JADU?
Yes, JADUs can be rented long-term. The owner must occupy either the main home or the JADU per California state law.
Does a JADU need its own bathroom?
Yes. A JADU must include a bathroom with toilet, sink, and shower or tub to qualify as a self-contained unit.
How long does JADU construction take?
Most JADU projects take 3–6 months from permit submission to final inspection, depending on city review times and project scope.
Ready to add a Junior ADU to your Orange County home?