Multi-Generational Living, Done Permitted
ADU regulations changed across Duval, Clay, St. Johns, and Nassau in the last few years. I work the current rules into the design instead of fighting the permit office at the end. Attached, detached, or garage-conversion — the right path depends on your lot, your zoning, and the person who'll live there.
- Detached ADUs – Private cottages with full kitchen + bath
- Attached In-Law Suites – Private door, optional connection to main house
- Garage Conversion ADUs – Convert existing garage into a permitted unit
- Aging-in-Place Built In – Zero-threshold, wider doorways, grab-bar blocking
- Permitted Zoning Path – Current ADU rules per county, handled
Detached ADUs
A standalone cottage on your property with its own bedroom, bathroom, kitchen, and living area. Detached ADUs give the most privacy for both households and have the most resale flexibility — they can serve as in-law housing now and rental income later, where zoning allows.
$150K–$320K
Final number depends on your specific scope, finishes, and site conditions. I'll quote the exact figure after a walk-through.
Why
Detached gives both households real privacy — separate door, separate yard space, separate driveway if the lot allows. Best resale flexibility too, because a true ADU is its own asset.
What
Standalone structure with foundation, framing, full electrical + plumbing, kitchen, bathroom, bedroom, living area, private entry. Optional separate utility meter where county requires.
How
Permit and zoning verification first (2–4 weeks); foundation week 5; frame and dry-in weeks 6–8; finishes weeks 9–14. Most detached ADUs land at 14–20 weeks total.
I won't draw a detached ADU until I've confirmed your zoning allows one. Saves you 6 weeks of design work that the county won't approve.
Attached In-Law Suites
Add a private wing to the main house with its own entry, bedroom, bathroom, and either a kitchenette or full kitchen. Attached suites share utilities and structural systems with the main home, which makes them faster and less expensive than a detached ADU.
$110K–$250K
Final number depends on your specific scope, finishes, and site conditions. I'll quote the exact figure after a walk-through.
Why
Attached is faster and cheaper than detached, and keeps the family in the same building when that matters — for caregiving, for shared meals, for kids running between houses.
What
Addition with private exterior entry, optional connecting door to main house, bedroom, full bathroom, kitchenette or full kitchen, living area. Shared HVAC zone or dedicated mini-split.
How
Foundation and frame in 2 weeks; dry-in by week 3; finishes weeks 4–10 depending on kitchen scope. Permit + structural assessment up front.
Attached suites add value when they read as part of the original house. I match siding, roofline, and trim profiles so the addition doesn't tell on itself.
Garage-Conversion ADUs
Convert an existing garage into a permitted ADU. The cheapest path to a legal accessory unit in most NE Florida counties — you already have a foundation, walls, and a roof. I add insulation, HVAC, plumbing, and the finishes that take it from garage to apartment.
$60K–$140K
Final number depends on your specific scope, finishes, and site conditions. I'll quote the exact figure after a walk-through.
Why
Most NE FL garages hold lawnmowers and boxes, not cars. Converting one into a permitted ADU is the lowest-cost path to multi-gen living — you skip foundation, framing, and roof costs.
What
Insulation upgrade, dedicated HVAC zone, full kitchenette or kitchen, full bathroom, finished floor over the existing slab, drywall, electrical upgrade, exterior siding to match the house where the garage door was.
How
Slab moisture barrier and frame-in week 1; HVAC + plumbing rough-in week 2; finishes weeks 3–6. Most garage-conversion ADUs are 6–10 weeks.
Garage slabs in Florida aren't dry. I add a proper moisture barrier and self-leveling overlay before any flooring goes down — otherwise the floor telegraphs every crack within a year.
What people ask me to build for multi-gen living.
See yours in the list? Tap it to jump to the form — you'll have a real budget range in 90 seconds. Don't see it? Tell me about it in step 6 — I read every one personally.
- Detached cottage for aging parents
- Attached in-law wing with private door
- Garage-conversion apartment
- Permitted ADU for rental income
- Backyard cottage on the existing lot
- Suite with full kitchen + bath
- Suite with kitchenette only
- Zero-threshold accessible entry
- 36-inch wide doorways
- Grab-bar blocking in the bathroom
- Curbless walk-in shower
- Lever handles throughout
- Comfort-height toilet
- Single-floor aging-in-place layout
- Private exterior entry
- Connecting door to main house
- Dedicated HVAC mini-split
- Separate utility meter (where allowed)
- Match exterior siding + roofline
- Adult-child living arrangement
- Caregiver suite + shared kitchen
- Future-rentable ADU build
Don't see yours? Describe it in step 6 — I read every one personally.
Frequently Asked Questions About ADUs & In-Law Suites
ADUs & In-Law Suites Service Areas
We proudly serve Jacksonville and the surrounding Northeast Florida communities. Our team of experienced professionals is ready to bring your vision to life, no matter where you're located in our service area.
Don't see your area?
Contact me to check availabilityRead the Clay County cost & permit guide.
An accessory dwelling unit (ADU) in Clay County, FL runs $40,000–$95,000 for a garage conversion, $80,000–$220,000 for an attached in-law suite addition, and $150,000–$450,000+ for a detached new-build ADU. Full breakdown — every tier, every permit step, every fee — in the guide.
Read the ADU & In-Law Suite guideOne contract. One number to call. One Mark.
Tell me about your adus & in-law suites above — you'll see your real budget range mid-flow, and I'll call within 24 hours with a specific quote. No project managers between us.
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