Garage Conversion ADU in Greenacres, FL: What It Costs and How Long It Takes
A garage conversion ADU in Greenacres transforms your existing attached or detached garage into a permitted accessory dwelling unit with its own kitchen, bathroom, sleeping area, and separate entrance. Most projects we handle here run 10 to 16 weeks from permit approval to final inspection, with budgets typically landing between $45,000 and $130,000 depending on whether the garage is already conditioned space and how much plumbing and electrical relocation is needed. Call (844) 665-0162 and we’ll walk through your specific garage layout and give you a free written estimate.
How We Convert a Garage to an ADU - Step by Step
Every garage conversion ADU in Greenacres follows a five-stage sequence. We’ve refined this over dozens of Palm Beach County projects, and the timeline below assumes a typical two-car garage on a single-family CBS home built between 1975 and 1990.
Stage 1: Site evaluation and feasibility (Days 1-5)
We measure your garage footprint, check ceiling height against code minimums, and trace where your existing electrical panel, water main, and sewer lateral sit relative to the space. You’ll decide here whether you want a full kitchen or a kitchenette, whether the bathroom needs a tub or just a shower, and whether you’re keeping the garage door opening as a glazed entry or framing it in permanently. This stage outputs a fixed-price proposal, not an estimate range.
Stage 2: Structural and MEP assessment (Days 6-14)
Our engineer evaluates whether the existing slab can support interior partition walls and whether the roof structure needs reinforcement for ceiling-mounted HVAC or added insulation weight. In Greenacres, we regularly find that pre-1994 homes need roof-to-wall connector upgrades before the county will sign off on any addition or conversion permit. You’ll get a clear yes/no on what structural work is mandatory versus optional. Duration: 1-2 weeks.
Stage 3: Permits and pre-construction (Weeks 3-6)
We submit to Palm Beach County plan review with full mechanical, electrical, and plumbing drawings. County turnaround for residential renovations currently runs 15-20 business days, though garage conversion ADUs often trigger a second review cycle because of the habitability requirements. We handle all resubmittals. You select finishes during this window: flooring, cabinetry, countertops, fixtures, and door hardware. Delays here almost always come from homeowner decision lag, not county processing.
Stage 4: Build and rough-in (Weeks 7-12)
Demolition is usually minimal - we’re working within four walls, not adding new ones. We frame interior partitions, run new electrical circuits from a sub-panel or upgraded main panel, rough in plumbing for kitchen and bath, and install a mini-split HVAC system or extend your existing ductwork. Insulation, drywall, and floor leveling follow. For Greenacres garages on original 1970s-80s slabs, we often need to grind or self-level before flooring goes down. You’ll do a mid-build walkthrough to confirm layout and outlet placement.
Stage 5: Finish, inspection, and closeout (Weeks 13-16)
Final electrical, plumbing, and mechanical inspections happen in sequence, followed by a county final. We install cabinets, countertops, flooring, fixtures, and appliances. Punch list and final walkthrough with you. The unit is now ready for occupancy permitting or rental registration if you’re going that route.
The Spec Choices That Move Your Budget
Garage conversion ADU projects in Greenacres involve more decisions than most homeowners expect upfront. Here’s where your money actually goes:
- Kitchen configuration: A full kitchen with range, full-size refrigerator, and dishwasher runs $8,000-$18,000 in this market. A kitchenette with a two-burner cooktop, under-counter fridge, and no dishwasher cuts that roughly in half. The choice depends on whether you’re renting the unit or housing family.
- Bathroom scope: A 3/4 bath with walk-in shower is standard for garage footprints and costs $6,000-$12,000. Adding a tub or expanding to a full bath with double vanity requires moving walls and drains, which can add $4,000-$8,000.
- Floor level and insulation: Original garage slabs sit below the main house finished floor, creating a step-down that feels like a garage. Raising the floor with sleepers and insulation adds $3,000-$6,000 but eliminates the “converted garage” feel and improves thermal performance.
- HVAC approach: A dedicated mini-split system ($3,500-$7,000 installed) is usually cleanest for a garage conversion ADU. Tapping into central ductwork often requires upsizing the main unit and running new trunk lines through attic space that wasn’t designed for it.
- Entry and egress: Converting the garage door opening to a proper residential entry with impact-rated door and sidelights costs $2,500-$5,500 in Palm Beach County. Keeping a service door and adding a window for bedroom egress is cheaper but may not give you the curb appeal or rental appeal you want.
What Garage Conversion ADU Costs in Greenacres, FL
| Project Scope | Typical Range |
|---|---|
| Basic garage conversion ADU (kitchenette, 3/4 bath, mini-split, standard finishes) | $45,000 - $75,000 |
| Mid-range conversion (full kitchen, full bath, raised floor, upgraded finishes) | $75,000 - $105,000 |
| High-end conversion (premium cabinets, stone counters, impact windows, structural upgrades) | $105,000 - $130,000 |
Five variables push you toward the high or low end of that range. First, garage size: a one-car footprint (typically 12′ x 20′) limits layout options and often requires space-saving fixtures, while a two-car or oversized garage gives you room for a true one-bedroom layout. Second, existing condition: garages with settled slabs, water intrusion, or termite damage need remediation before conversion work starts. Third, utility relocation distance: if your main sewer lateral sits at the opposite corner of the house, running new drain lines across the slab or through the attic adds significant plumbing cost. Fourth, material grade: laminate counters and vinyl plank flooring versus quartz and tile changes the finish budget by $5,000-$12,000. Fifth, code-triggered upgrades: Palm Beach County’s strict amendments to the Florida Building Code often require roof connector and opening protection work on pre-1994 homes, which can add $4,000-$10,000 that out-of-county bidders sometimes miss.
A written estimate from us includes all labor, materials, permits, and inspections for the conversion scope itself. It does not include separate utility connection fees from the city or water district, rental registration if you’re leasing the unit, or landscape restoration if we need to trench for sewer or electrical.
Why Greenacres Homes Make This Job Different
Greenacres sits on the flat interior plain of Palm Beach County where the water table runs just 2-4 feet below grade. That means any garage conversion ADU here needs careful attention to slab moisture barriers and perimeter drainage, especially for original 1970s-80s slabs that were never designed for conditioned interior space. We’ve seen conversions where skipping this step led to flooring failure within two years.
The housing stock tells the bigger story. Most Greenacres homes are single-story CBS construction from the late 1960s through early 1990s, many with original flat or low-slope membrane roofs that have exceeded their service life. When we pull a permit for a garage conversion ADU on these properties, Palm Beach County plan review almost always triggers a roof-to-wall connector inspection and upgrade requirement. It’s not optional, and it’s not something a contractor unfamiliar with local amendments will catch in their initial bid. We’ve had homeowners call us after another crew lowballed the job and then hit them with a $7,000 change order for strap retrofits mid-project.
The flat terrain drains entirely through the county canal network, so any site work that disrupts sheet flow - say, trenching for a new sewer lateral - requires careful planning to avoid flooding neighboring lots. And sitting inland without coastal buffering, Greenacres garages take the full force of summer convective storms and hurricane-season wind loads. Impact-rated windows and proper door seals aren’t upgrades here; they’re code requirements that protect your investment and your tenant.
Homeowners doing a full property update often pair a garage conversion ADU with interior finishes through our Cabinets & Countertops in Greenacres team, or flooring updates through Backsplash, Tile & Flooring in Greenacres, so the main house and new unit feel cohesive.
Serving Greenacres, FL - Our Local Coverage Area
We’re based in the Greenacres 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 - Garage Conversion ADU in Greenacres
Most garage conversion ADU projects in Greenacres take 10 to 16 weeks from permit approval to final inspection, with permit review adding another 3-5 weeks upfront. The biggest schedule killers are homeowner decision delays on finishes and county resubmittals on older homes that trigger structural upgrade requirements. Call (844) 665-0162 and we’ll give you a realistic timeline based on your garage’s age and condition.
Yes, absolutely. Palm Beach County requires full building, electrical, plumbing, and mechanical permits for any garage conversion ADU because you’re creating a habitable dwelling unit with cooking and bathing facilities. The county will also require proof that your property meets zoning for ADU square footage and setback rules. We handle the entire permit process as part of our scope.
You can minimize relocation if your garage already has a sink or washer hookup near where you want the kitchen, and if your electrical panel has capacity for a sub-panel nearby. But you’ll almost always need new dedicated circuits for kitchen appliances and bathroom GFCI outlets, and a new sewer connection for the toilet if the garage never had one. During our free evaluation, we trace your existing systems and show you exactly what stays and what moves.
In Greenacres, a garage conversion ADU typically runs $45,000-$130,000, while new detached ADU construction starts around $90,000 and often exceeds $150,000. You’re saving foundation, roof, and exterior wall costs because the structure exists. The trade-off is working within fixed dimensions and dealing with whatever condition the existing slab and roof are in.
We warranty our workmanship on garage conversion ADU projects, and the materials we install carry their own manufacturer warranties - for example, mini-split systems typically include 5-10 year compressor coverage, and cabinetry carries limited lifetime warranties from brands like KraftMaid or Wellborn. We provide all warranty documentation at project closeout and handle any manufacturer claims that arise. Call (844) 665-0162 for the full warranty schedule.
Ready to See What Your Garage Can Become?
We’ll come to your Greenacres property, measure your garage, trace your utilities, and give you a fixed-price proposal for converting it to a permitted ADU - no obligation, no pressure. Call (844) 665-0162 or request an estimate online. Raymond Estevez or a senior member of our team will walk the site with you, flag the code issues your specific home will face, and show you material samples from our full brand roster so you can see exactly what you’re choosing before you commit.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Greenacres and Palm Beach County. Our Home Additions & ADU crew handles garage conversions as part of a full Home Additions & ADU in Greenacres practice - one contractor, every phase, from driveway to roofline.