Junior ADU & Interior Conversion in Greenacres: What It Costs and How Long It Takes
A Junior ADU & Interior Conversion in Greenacres transforms an existing room or attached space into a self-contained living unit with its own entrance, kitchenette, and full bathroom, typically taking 10-16 weeks from permit approval to final inspection. In Greenacres, most projects run $45,000-$130,000 depending on whether you’re converting a garage, a large bedroom wing, or a Florida room addition. Call (844) 665-0162 and we’ll walk through your exact layout and give you a written, line-item estimate.
How We Approach a Junior ADU & Interior Conversion in Greenacres
We’ve done enough of these in Palm Beach County to know the sequence matters. A junior ADU isn’t a kitchen remodel with a bed thrown in. It’s a code-compliant dwelling unit, and the order of decisions determines whether you hit your move-in date or get stuck in re-inspection loops.
Stage 1: Feasibility and existing conditions, 1-2 weeks. We measure everything, photograph the structure, and pull the original permit history from Palm Beach County. For Greenacres homes built in the 1970s or 1980s, we’re checking whether the roof-to-wall connectors meet current wind-load standards, because the county almost always flags this during plan review. You’ll decide at this stage whether to proceed with a full permit package or do a preliminary structural assessment first.
Stage 2: Design and material selection, 2-3 weeks. This is where you choose your path. We lay out the kitchenette footprint, bathroom location, and separate entrance. You’ll pick cabinet grade (KraftMaid or Wellborn for mid-tier durability, or custom built-ins for tighter spaces), countertop material (Cambria quartz handles humidity better than porous stone in our climate), and whether the exterior door needs impact-rated glass. We submit to permitting only after you’ve signed off on every selection.
Stage 3: Structural and MEP rough-in, 3-5 weeks. Demolition is usually minimal since we’re working within the existing envelope, but we often need to sister joists for the added bathroom load, run new electrical sub-panels, and stub in a mini-split HVAC zone. If your conversion involves a garage, we cut the slab for plumbing and address the step-down elevation. In Greenacres, we coordinate the rough inspections tightly because the county’s field inspectors will check roof connector upgrades if they were triggered at plan review.
Stage 4: Finish installation, 3-4 weeks. Cabinets go in, countertops get templated and installed, tile or LVP flooring goes down, and the kitchenette appliances get connected. We install the separate exterior door last so the lockset and threshold seal properly against the existing wall plane. You’ll do a walkthrough with us mid-stage to confirm paint colors and fixture placements before final hookups.
Stage 5: Final inspection and punch list, 1-2 weeks. Palm Beach County checks life safety items: egress window size, GFCI/AFCI protection, smoke/CO detector interconnect, and proper door hardware for the separate entrance. We fix anything on the spot and hand over keys. Most of our Greenacres clients are hosting family or collecting rent within a week of final sign-off.
The Choices That Shape Your Junior ADU & Interior Conversion
Every junior ADU forces trade-offs between space, durability, and budget. Here’s what Greenacres homeowners actually decide between:
- Kitchenette scope: A wet bar with microwave and mini-fridge runs $3,500-$6,500. A full two-burner cooktop with vented range hood and dishwasher drawer pushes to $8,000-$14,000. For rental use, the full kitchenette pays back faster. For aging-parent occupancy, the simpler setup reduces maintenance anxiety.
- Bathroom configuration: A 32-inch shower stall with a wall-hung vanity fits in 35 square feet and costs $4,500-$8,000. A 60-inch tub-shower with linen storage needs 50+ square feet and runs $7,500-$12,000. In Greenacres’ older CBS homes, moving the toilet flange more than a few feet often means cutting concrete slab, which adds $1,500-$3,500.
- Exterior door type: A standard steel prehung with deadbolt costs $800-$1,400 installed. An impact-rated fiberglass door with laminated glass, required if the junior ADU faces within 30 feet of a property line in some Greenacres subdivisions, runs $2,200-$4,500. We verify your HOA docs before you commit.
- HVAC approach: A ductless mini-split ($3,000-$5,500) is almost always the right call for junior ADUs in our market. Extending the main house system creates zoning headaches and often doesn’t have enough capacity for the added load.
- Floor finish: Luxury vinyl plank ($4-$7 per square foot installed) handles humidity and slab moisture better than engineered hardwood. Tile ($6-$12 per square foot) lasts forever but feels cold underfoot. We rarely recommend carpet in South Florida conversions.
What Junior ADU & Interior Conversion Costs in Greenacres, FL
In Greenacres, a Junior ADU & Interior Conversion typically costs $45,000-$130,000. The median project we’ve priced in the last two years sits around $78,000 for a 450-square-foot garage conversion with mid-grade finishes.
Five variables move you within that range:
- Existing condition of the host structure: A 1980s garage with intact slab, adequate headroom, and no active water intrusion starts at the low end. A Florida room with rotted sill plates, failing flat roof, or termite damage adds $8,000-$20,000 in remediation before conversion work begins.
- Plumbing and electrical distance: If your bathroom and kitchenette can tie into existing wet walls, you save $4,000-$8,000. Running new sewer lines across the house to reach the main stack, or upgrading a 100-amp panel to 200-amp, pushes costs toward the high end.
- Structural modifications: Removing a load-bearing wall to open up the space, or cutting in a new window for egress, adds $3,500-$10,000 depending on beam sizing and header requirements.
- Material grade: Entry-level cabinets, solid-surface countertops, and standard fixtures keep finishes around $12,000-$18,000. Stepping up to KraftMaid semi-custom with Cambria countertops and Moen fixtures runs $22,000-$35,000 for the same footprint.
- Permit scope and code triggers: In Greenacres, pre-1994 homes often trigger mandatory roof-to-wall connector upgrades and impact-rated opening replacements. We’ve seen this add $6,000-$15,000 to projects where the homeowner didn’t anticipate it.
A written estimate from us includes demolition, rough and finish carpentry, plumbing and electrical rough-in and trim, HVAC, insulation, drywall, paint, flooring, cabinets, countertops, fixtures, and appliance connections. It does not include permit fees (typically $800-$2,200 in Palm Beach County), appliance purchases, window treatments, or landscaping repair from the separate entrance cut-in.
Why Greenacres Homes Make This Job Different
Greenacres sits on the flat interior plain of Palm Beach County where the water table rides just 2-4 feet below grade. That single fact changes everything about slab work, drainage, and foundation prep for any conversion that touches the floor plane. We’ve cut garage slabs in Greenacres and hit water at 18 inches. We plan for it now, but out-of-county crews who don’t know the local hydrogeology routinely underestimate dewatering and vapor barrier costs.
The housing stock here is overwhelmingly CBS construction from the 1970s through early 1990s, much of it with original flat or low-slope membrane roofs that have exceeded their design life. When we pull permits for a Junior ADU & Interior Conversion in Greenacres, Palm Beach County plan review almost always flags roof-to-wall connector upgrades and opening protection if the home predates the 2001 Florida Building Code, which is why our our Roof Repair service in Greenacres expertise matters from day one. We’ve learned to price this in from day one. Contractors unfamiliar with local amendments get caught mid-project, and the homeowner eats the change order.
The city’s inland position also means it takes the full brunt of summer convective storms and hurricane season without the modest buffering coastal cities get. Any new opening we cut, a separate entrance door or egress window, needs proper flashing and drainage integration with the existing stucco envelope. We’ve seen water intrusion destroy finished ADU interiors because the door threshold wasn’t pan-flashed to the CBS wall. We don’t let that happen on our jobs.
Many Greenacres neighborhoods, particularly the condo communities and single-family tracts near 10th Avenue North, have active HOAs with design review boards. We handle the architectural submittal package as part of our process, including elevation drawings and material samples, so you’re not chasing signatures while your permit sits idle.
Serving Greenacres, FL - Our Local Coverage Area
We’re based in our Home Additions & ADU in Greenacres service area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
Frequently Asked - Junior ADU & Interior Conversion in Greenacres
Most projects take 10-16 weeks after permit approval, with permitting itself adding 4-8 weeks in Palm Beach County. Pre-1994 homes often need structural upgrade approvals that extend the timeline. Call (844) 665-0162 and we’ll check your address against the permit history to give you a realistic schedule.
Yes, absolutely. Palm Beach County requires full building permits, and most Greenacres projects trigger electrical, plumbing, and mechanical sub-permits as well. The county will also verify compliance with the Florida Building Code’s wind-load provisions for the existing structure. We handle the entire permit package, including the structural calculations if roof connectors need upgrading.
Sometimes, but rarely in the layouts we see. If your target space already has a bathroom on the opposite side of a wet wall, you might save $4,000-$8,000. Most Greenacres conversions require at least a new electrical sub-panel and extended sewer lines to make the unit self-contained. We’ll tell you honestly during the feasibility walkthrough whether your existing layout works or needs reconfiguration.
Typically yes. A Junior ADU & Interior Conversion in Greenacres runs $45,000-$130,000, while a detached Home Additions & ADU usually starts around $90,000 and climbs past $200,000. You’re leveraging existing walls, roof, and foundation. The trade-off is less privacy for the occupant and no separate utility metering, which matters if you’re planning long-term rental income.
We warranty our workmanship for one year from final inspection, and all manufacturer warranties pass through to you, KraftMaid cabinets, Cambria countertops, Moen fixtures, and so on. Our goal is that you never need to call us back, but if something’s not right, we fix it. For warranty details specific to your material selections, ask during your estimate walkthrough.
Get a Free Estimate for Your Junior ADU & Interior Conversion in Greenacres
Call (844) 665-0162 to schedule a free on-site estimate. We’ll walk your space, check the existing conditions that matter for permitting, and email you a written, line-item proposal within 48 hours. No deposit required to start the conversation.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Greenacres and South Florida.