Garage Conversion ADU in Miami Lakes: Timeline, Scope, and Cost
A garage conversion ADU in Miami Lakes transforms your existing attached or detached garage into a permitted, habitable dwelling unit with its own kitchen, bath, sleeping area, and separate entrance. Most conversions we handle in Miami Lakes run 4 to 7 months from permit submission to final inspection, with construction itself taking 10 to 14 weeks. Budget for $30,000-$80,000 depending on whether you’re keeping the slab and roof structure or rebuilding major systems. Call (844) 665-0162 and we’ll walk your specific garage and give you a written estimate with no obligation.
How We Convert a Garage to an ADU in Miami Lakes
Every garage conversion ADU follows a five-stage sequence. Here’s what actually happens, what you’ll need to decide, and how long each stage takes on a typical Miami Lakes project.
Stage 1: Feasibility and Existing Conditions Survey (1-2 weeks)
We measure your garage, photograph the existing slab, roof structure, electrical panel, and plumbing access points, then pull the original permit history from Miami-Dade County if it’s available. You’ll decide at this stage whether you want a full kitchen or a kitchenette, whether the unit needs to be fully metered separately or sub-metered, and whether you’re targeting long-term rental income or family use. That choice drives the electrical load calculation and whether we need a service upgrade.
Stage 2: Design, Engineering, and Permit Submission (4-8 weeks)
Our architect draws plans showing the new layout, structural modifications, and HVHZ-compliant opening protection. Because Miami Lakes sits in Miami-Dade’s High-Velocity Hurricane Zone, every window, door, and impact-rated product must carry a Miami-Dade Notice of Acceptance (NOA). We submit to Miami-Dade’s building department, not a local town office. You’ll review and approve material specs here: flooring type, cabinetry line, countertop surface, fixture package, and exterior finish to match or complement your main home.
Stage 3: Demolition, Structural Prep, and Rough Utilities (2-3 weeks)
We strip the garage interior, evaluate the slab for levelness and moisture intrusion (common in Miami Lakes’s 1960s-1980s CBS builds), and cut for plumbing drains and electrical conduit. If your garage slab sits below the main house floor, we may need to pour a raised subfloor or install a step-down transition. You’ll sign off on any slab repairs or drainage corrections we discover once the concrete is opened.
Stage 4: Framing, Systems, and Dry-In (3-4 weeks)
Walls go up, HVAC mini-split linesets run, electrical and plumbing rough-ins get inspected, and we install impact-rated windows and doors. This is when the ADU starts looking like a real living space. You’ll do a walkthrough to confirm outlet locations, lighting switch positions, and any custom framing for built-ins.
Stage 5: Finishes, Final Inspection, and Certificate of Occupancy (2-3 weeks)
Drywall, paint, flooring, cabinetry, countertops, fixtures, and appliances. We schedule Miami-Dade’s final inspection, address any punch items, and hand over keys. You’ll receive a final packet with permits, inspection sign-offs, and manufacturer warranties for all installed products.
The Options You’ll Choose Between for Your Garage Conversion ADU
These decisions come up on nearly every Miami Lakes garage conversion ADU we build. Each choice has a real cost and durability trade-off:
- Kitchen scope: kitchenette vs. full kitchen. A kitchenette with a mini-fridge, two-burner cooktop, and single-bowl sink runs $3,500-$6,500 installed. A full kitchen with full-size appliances, dishwasher, and 8-10 cabinets pushes $12,000-$22,000. Rental ADUs usually need the full kitchen to command market rate; family-use units often get by with less.
- Cabinetry grade: stock, semi-custom, or custom. Stock boxes from a big-box supplier cost less but offer limited sizes, which matters in tight garage footprints. Semi-custom lines like KraftMaid or Wellborn let you optimize every inch with pull-out pantries, corner solutions, and finished panels. Budget $4,000-$9,000 for semi-custom in a typical garage ADU kitchen.
- Countertop material: laminate, quartz, or solid surface. Laminate survives fine in a rental but shows wear within 5-7 years. Engineered quartz from Cambria resists staining and carries a residential warranty, though it adds $1,500-$3,500 over laminate. We install both; the right choice depends on who’s living there and for how long.
- Flooring: LVP, tile, or polished concrete. Luxury vinyl plank is fast to install and forgiving on uneven slabs, common in older Miami Lakes garages. Porcelain tile lasts longer but needs a flatter substrate, which may require self-leveling compound at $2-$4 per square foot. Polished concrete works if the existing slab is in good shape and you want an industrial aesthetic.
- HVAC: wall-mounted mini-split vs. extending central air. A dedicated mini-split with its own condenser keeps utility billing clean and avoids overloading your main home’s system. Extending ductwork from the main house is cheaper upfront but complicates separate metering and can trigger a full load calculation that requires a panel upgrade.
- Exterior finish: stucco match, siding, or trim integration. Most Miami Lakes homes are CBS stucco, so we typically apply a matching stucco system with James Hardie trim details at doors and windows. If your garage has a different original finish, we’ll sample and match rather than contrast.
What Garage Conversion ADU Costs in Miami Lakes, FL
Garage conversion ADU projects in Miami Lakes typically fall between $30,000 and $80,000. Here’s what pushes a job toward the low or high end:
| Cost Factor | Low-End Scenario | High-End Scenario |
|---|---|---|
| Garage size and condition | 400 sq ft, dry slab, sound roof | 600+ sq ft, sagging roof, cracked slab |
| Plumbing/electrical relocation | Kitchenette, existing panel has capacity | Full kitchen, new sewer line, 200A service upgrade |
| Structural modifications | Interior framing only, no beam changes | New header for widened opening, tie-beam reinforcement |
| Material and fixture grade | Stock cabinets, laminate counters, LVP flooring | Semi-custom cabinets, quartz, tile, impact doors |
| Permit scope and inspections | Standard conversion, no zoning variance | Variance for setback, additional fire-separation requirements |
Our written estimates include demolition, rough and finish carpentry, plumbing and electrical rough-in and trim, HVAC rough-in and equipment, insulation, drywall, paint, flooring, cabinetry, countertops, fixtures, and final cleanup. They do not include appliance packages, window coverings, or landscaping repair outside the garage footprint. We’ll flag any of those separately so you’re not surprised.
If your garage conversion ADU is part of a full Home Additions & ADU in Miami Lakes project, we coordinate the whole scope under one schedule and one point of contact.
What Miami Lakes Homes Specifically Do to This Job
Miami Lakes was developed as a master-planned community by the Graham Companies beginning in the late 1960s. The residential stock is almost entirely aging concrete block stucco construction from a single compressed era. That uniformity means we see the same conditions repeatedly: flat or low-slope garage roofs with original tie-beam construction that needs reinforcement before it’ll pass Miami-Dade inspection, original electrical panels at or near capacity, and garage slabs poured without vapor barriers that show moisture migration during our slab evaluation.
The town’s extensive network of man-made lakes keeps the water table at 1-2 feet below grade across much of the community. Any plumbing trenching, footer work, or drainage correction in a garage conversion ADU runs into wetter conditions than comparable projects in drier inland Miami-Dade neighborhoods. We plan for dewatering and engineered fill as standard contingencies here, not exceptions.
Because Miami Lakes is essentially built-out, nearly every garage conversion ADU we perform is renovation and addition work rather than new construction. The concentrated 1970s-1980s building boom also means post-tensioned slab foundations are common in that era’s commercial and multi-family stock, and some residential garages share that DNA. Before we cut any slab for plumbing reroutes or electrical conduit, we bring in a structural engineer for GPR scanning. Severing a tensioned cable turns a $40,000 conversion into a structural repair that can double the budget.
Every product we specify, from windows to door hardware to roofing underlayment, must carry a Miami-Dade NOA. That’s a layer of procurement discipline that contractors working just across the Broward County line don’t always maintain. Our Home Additions & ADU crew keeps a running inventory of NOA-approved materials so we don’t lose weeks to special-order lead times.
We cover Miami Lakes and the surrounding area including Hialeah, Hialeah Gardens, Country Club, and Palm Springs North. Homeowners often pair a garage conversion ADU with interior updates elsewhere in the home, and we coordinate those through our Cabinets & Countertops in Miami Lakes and Backsplash, Tile & Flooring in Miami Lakes teams without handing you off to separate subcontractors.
Serving Miami Lakes, FL - Our Local Coverage Area
We’re based in the Miami Lakes 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 Miami Lakes
Most garage conversion ADU projects in Miami Lakes take 4 to 7 months from signed contract to certificate of occupancy, with 4 to 8 weeks of that being design and permit submission to Miami-Dade. Construction itself runs 10 to 14 weeks depending on inspection scheduling and any slab or structural corrections we encounter. Call (844) 665-0162 and we can give you a tighter timeline after seeing your specific garage.
Yes. Every garage conversion ADU in Miami Lakes requires Miami-Dade County building permits for structural, electrical, plumbing, and mechanical work, plus zoning verification that your lot allows the additional dwelling unit. Miami-Dade administers permits directly; Miami Lakes does not have its own building department. We handle the entire permit package as part of our standard process.
Only if your garage already has the right rough-ins in the right places, which is rare in Miami Lakes’s 1960s-1980s housing stock. Most conversions need new plumbing drains cut through the slab and electrical circuits added or upgraded. Keeping existing locations can save $4,000-$8,000, but we’ll confirm what’s actually possible during our feasibility survey.
The lowest-cost garage conversion ADU keeps the existing slab, roof structure, and electrical panel if capacity allows; uses a kitchenette instead of a full kitchen; and selects stock cabinets, laminate countertops, and LVP flooring. That combination can land near the $30,000 range. Cutting scope on structural or HVAC systems to save money usually creates code compliance problems that cost more to fix later.
We warranty our workmanship for one year from final inspection. Manufacturer warranties cover the specific products we install: cabinetry, countertops, fixtures, flooring, windows, doors, and HVAC equipment each carry their own terms, typically 5 to 20 years depending on the brand and product line. We register all warranties in your name and include the documentation in your final project packet.
Get a Free On-Site Estimate for Your Garage Conversion ADU
We’ll walk your garage, talk through what you’re trying to accomplish, and email you a detailed written estimate within two business days. No pressure, no generic pricing. Call (844) 665-0162 or fill out our contact form to schedule. Raymond Estevez and our Miami Lakes team handle every phase in-house, from the first measurement to the final inspection walkthrough.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Miami Lakes since our founding.