What Does a Garage Conversion ADU Cost and Involve in Homestead?
A garage conversion ADU in Homestead transforms your existing attached or detached garage into a permitted, habitable dwelling unit with its own kitchenette, bath, sleeping area, and separate entrance. Most projects we run in Homestead finish in 10 to 16 weeks from permit approval, and the typical investment runs $30,000-$80,000 depending on whether your garage is already conditioned space or a raw concrete shell. Call (844) 665-0162 and we’ll walk your property this week - estimates are free, and we pull permits through Miami-Dade ourselves.
How We Convert a Garage into an ADU - Start to Finish
We’ve refined this into five clear stages so you know what’s happening, what you’re deciding, and how long each piece takes.
Stage 1: Site measure and feasibility (Week 1)
We visit your property in Homestead, photograph the existing slab, roof structure, electrical panel, and any plumbing locations. You’ll decide right then whether you want a full kitchen or a kitchenette, whether the unit needs its own meter or will sub-meter from the main house, and whether you’re targeting long-term rental income or family use - that choice drives the finish grade and layout. We check your HOA docs if you have them; many Homestead master-planned communities have specific ADU restrictions even when Miami-Dade allows the build.
Stage 2: Design and permit drawings (Weeks 2-5)
Our draftsperson produces plans showing the new floor plan, electrical service upgrade if needed, plumbing rough-in, and impact-rated window and door locations. Here’s where the Miami-Dade HVHZ requirements hit: every window, exterior door, and skylight must carry a Miami-Dade NOA (Notice of Acceptance) product approval number, and the plans must show hurricane straps or approved anchor bolts connecting the converted structure to the slab. We submit to Miami-Dade Building and Zoning; typical turnaround is 3-4 weeks for a garage conversion ADU, longer if your property sits near a flood zone boundary and needs an elevation certificate.
Stage 3: Structural and MEP rough-in (Weeks 6-10)
Demolition is usually minimal - we strip drywall, remove the garage door, and frame in that opening with a rated wall assembly. The slab gets tested; in older Homestead garages, especially pre-Andrew construction in the Redland area west of Krome Avenue, we’ve found slabs too thin or too cracked to support a conditioned unit without a floating subfloor or partial repour. Plumbing gets roughed to the new kitchenette and bath, electrical panels get evaluated for capacity, and mini-split HVAC linesets get run. You’ll do a walkthrough here to confirm fixture locations before we close walls.
Stage 4: Insulation, drywall, and finishes (Weeks 11-14)
We insulate to Miami-Dade energy code, hang and finish drywall, then move to flooring, cabinetry, countertops, and tile. This is where material choices matter most - we’ll have already narrowed your selections during Stage 2, but final confirmation happens now. Many homeowners pair this phase with interior upgrades to the main house; if you’re already thinking about cabinets & countertops in Homestead, we can coordinate both kitchens from the same material order and save on freight and handling.
Stage 5: Final inspection and certificate of occupancy (Weeks 15-16)
Miami-Dade inspects structural, electrical, plumbing, mechanical, and fire separation. The garage-to-ADU conversion requires a final zoning sign-off confirming the unit meets setback and lot coverage rules. Once the C.O. issues, the unit is legally rentable or occupiable. We do a punch walk with you, transfer warranties, and you’re done.
The Spec Choices That Shape Your Garage Conversion ADU
- Garage door replacement vs. infill wall: Removing the overhead door and framing a stud wall with impact-rated windows runs $4,000-$9,000 depending on opening width. Keeping a door - say, for future vehicle access - means installing a rated pedestrian door within it, which costs more and complicates insulation. Most Homestead homeowners infill for better envelope performance.
- Slab strategy: If your existing garage slab is 4 inches and cracked, we can overlay with a floating subfloor and moisture barrier for $3,000-$6,000, or cut and repour sections for $5,000-$12,000. The Redland’s older outbuildings often need full repours due to organic soil settlement.
- Kitchenette vs. full kitchen: A 24-inch cooktop, compact fridge, and single-bowl sink keeps the footprint tight and costs $4,000-$8,000 installed. A full kitchen with standard appliances, island prep space, and dishwasher adds $10,000-$18,000 but attracts higher rental rates.
- HVAC approach: Ductless mini-split is standard for garage conversion ADU work - $3,500-$7,500 for a single-zone system sized to the converted volume. Tying into the main house’s central system is rarely practical due to capacity and code separation requirements.
- Electrical service: A 200-amp main panel usually has spare capacity for a modest ADU. If you’re upgrading from 100-amp service or adding an EV charger for the tenant, budget $3,000-$7,000 for a service upgrade and new meter base.
- Interior flow: Some homeowners want the ADU completely separated; others add an interior connecting door for multi-generational living. That decision affects fire-rated assembly requirements and sound insulation specs.
Homeowners often extend the finish level into adjacent spaces at the same time - if you’re considering backsplash, tile & flooring in Homestead, we can run continuous materials from the main house through to the new unit for visual cohesion.
What Garage Conversion ADU Costs in Homestead, FL
| Cost Component | Typical Range |
|---|---|
| Base garage conversion ADU (framing, MEP, standard finishes) | $30,000 - $55,000 |
| Mid-grade with upgraded kitchenette, impact windows, mini-split | $50,000 - $70,000 |
| High-end with full kitchen, slab repour, premium flooring, separate meter | $65,000 - $80,000 |
Five variables push your number up or down:
Existing condition. A finished garage with drywall, insulation, and an existing window is a $15,000-$25,000 head start over a raw block shell with a tilt-up door and no utilities.
Size and layout complexity. A standard 20-by-20-foot two-car garage converts efficiently. A single-car garage or an L-shaped footprint with a workshop bump-out adds framing and finish labor.
Utility relocation and capacity. Moving the main electrical panel, adding a second water heater, or trenching for sewer connection to a detached garage can add $5,000-$15,000.
Material grade. Stock cabinetry and vinyl plank flooring keep costs down. Custom KraftMaid or Wellborn cabinets, Silestone or Cambria countertops, and porcelain tile raise the finish investment but also the rental appraisal.
Permit scope and flood zone status. Properties in AE or VE zones near the Keys line need elevation documentation that adds survey and engineering fees. Most Homestead conversions avoid this, but parcels south of SW 312th Street or west of Krome Avenue sometimes trigger it.
Our written estimates itemize labor, materials, permit fees, and allowance categories. They do not include appliance packages, window treatments, or landscaping - those sit in a separate optional column you can take or leave.
What Homestead Homes Specifically Do to This Job
Homestead’s housing story is Hurricane Andrew, and that history shapes every garage conversion ADU we bid here.
The bulk of residential stock in ZIPs 33032 through 33035 is post-1992 CBS construction - concrete block, stucco, hip roofs, hurricane-strapped trusses - built to Miami-Dade High-Velocity Hurricane Zone standards, the strictest wind-load rules in the continental United States. What that means for your garage conversion: any new window or exterior door must carry a Miami-Dade NOA product approval number. We see contractors from Broward or Palm Beach spec impact-rated products that meet their local code but lack the specific Miami-Dade NOA documentation, and those permit submittals get rejected. We don’t.
The slab is the other Homestead-specific variable. Post-Andrew garages were poured to 4-inch thickness with minimal reinforcement, adequate for vehicles but not always for a conditioned living space with tile or hardwood. In the Redland agricultural corridor west of Krome Avenue, we’ve worked on mid-century farm outbuildings with no footings at all, sitting on expansive marl that heaves in wet season. Those need soil testing and engineered fill before we frame a wall.
Stormwater matters too. Homestead’s high water table and sheet-flow flooding during summer thunderstorms mean your converted garage needs proper grading, and if you’re adding bathroom fixtures, the sewer lateral may need a backflow preventer. We handle this in the permit set; it’s not an afterthought.
And then there’s the jurisdictional puzzle. Homestead sits at the southern end of Miami-Dade County, and many local contractors run crews down US-1 into Monroe County for Keys jobs. We don’t mix the two on the same week’s schedule - Miami-Dade permits, inspections, and product approvals are a completely separate system from Monroe’s, with different fees and stricter elevation requirements. Your Homestead garage conversion ADU stays in Miami-Dade from application to C.O.
Serving Homestead, FL - Our Local Coverage Area
We’re based in the Homestead 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 Homestead
Most projects take 10 to 16 weeks from permit approval to certificate of occupancy, with 3 to 5 weeks of that being Miami-Dade plan review and inspections. Call (844) 665-0162 to check current permit turnaround times - they fluctuate seasonally.
Yes, absolutely. Miami-Dade requires building, electrical, plumbing, mechanical, and zoning permits for any garage conversion ADU, and the finished unit must pass final inspection and receive a certificate of occupancy before anyone can legally live in it. We pull all permits as part of our scope.
Sometimes, if your garage already has a utility sink, adequate electrical outlets, and a panel with spare capacity. Most conversions need at least a bathroom rough-in and a dedicated mini-split circuit, which means some trenching and new branch lines. We’ll tell you exactly what’s required during the feasibility visit.
The lowest-cost path is a finished garage with existing windows, a kitchenette instead of a full kitchen, vinyl plank flooring, and no slab work or service upgrade. That typically lands in the $30,000-$40,000 range. Cutting below that usually means skipping code requirements, which we won’t do. Call (844) 665-0162 and we’ll show you where to save without compromising compliance.
We warranty our workmanship for one year, and every product we install carries its own manufacturer warranty - KraftMaid or Wellborn cabinets, Silestone or Cambria countertops, Andersen or PGT windows, depending on your selections. We register warranties in your name and transfer all documentation at final walkthrough.
Ready to Convert Your Garage? Let’s Walk It Together
Call (844) 665-0162 to schedule a free on-site estimate for your garage conversion ADU in Homestead. We’ll measure your existing space, check your panel and slab, review any HOA restrictions, and deliver an itemized written estimate within 48 hours. No deposit required to start the conversation. Home Additions & ADU in Homestead is part of a full home additions & ADU capability that covers everything from garage conversions to prefab units from Mighty Buildings and Boxabl - one contractor, every phase, and you choose the brand while we handle the build.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Homestead and South Florida.