Garage Conversion ADU in Westview: Timeline, Cost, and What to Expect
A garage conversion ADU in Westview transforms your existing attached or detached garage into a permitted dwelling unit with its own kitchen, bath, living space, and separate entrance. Most conversions we handle in the 33167 area run 4 to 6 months from permit application to final inspection, with construction itself taking 10 to 14 weeks. Budget $30,000 to $80,000 depending on whether you’re keeping the existing slab and roof structure or replacing them to meet current Miami-Dade HVHZ code. Call (844) 665-0162 and we’ll walk your specific garage with you.
How We Convert a Garage to an ADU in Westview
We’ve done enough of these in northern Miami-Dade to know where the surprises hide. Here’s the actual sequence, with the decisions you’ll need to make at each point.
Stage 1: Feasibility and existing conditions (Week 1)
We measure your garage footprint, check the slab thickness and reinforcement, and photograph the roof structure and existing electrical panel. You’ll decide right here whether you want a studio layout or a one-bedroom with a separate sleeping area. That choice determines whether we need to add a partition wall and how the HVAC gets zoned. We also run a preliminary check on your property’s setbacks and impervious surface coverage against Miami-Dade’s unincorporated zoning. If your garage sits on a 4-inch slab with no rebar, we’re already talking about a full slab replacement, not just a finish floor.
Stage 2: Design and permit docs (Weeks 2-6)
Our draftsperson produces plans showing the conversion layout, structural details, and MEP routing. You’ll pick your cabinet line, countertop material, flooring type, and fixture package during this window. We submit to Miami-Dade Building for plan review, which typically takes 3 to 4 weeks for garage conversions in unincorporated areas. If your home was built before 1992, expect comments back about hurricane strap upgrades and impact-rated openings. We handle the resubmittals, but the clock doesn’t stop.
Stage 3: Demolition and rough construction (Weeks 7-10)
We strip the garage interior, remove the overhead door, and frame the new wall assembly where the door was. This is when we discover whether the existing tie beam can carry the new header load, or whether we need to pour a reinforced pier and grade beam. Plumbing rough-in happens here too. If you’re adding a full bath, we core through the slab for drainage or, in some Westview homes with shallow water tables, design a pumped waste system. Electrical service upgrade to 200-amp is common in this stage.
Stage 4: Systems and finishes (Weeks 11-16)
Insulation, drywall, flooring, cabinets, countertops, and fixture installation. We use moisture-resistant materials throughout because of Westview’s humidity load. Your paint color, tile selection, and whether you opted for luxury vinyl plank versus porcelain tile all get locked in during ordering lead times in Stage 2. We coordinate the rough and final inspections for plumbing, electrical, and mechanical in this window.
Stage 5: Final inspection and certificate of occupancy (Weeks 17-20)
Miami-Dade inspectors verify egress window sizing, smoke detector interconnection, and HVAC capacity against the conditioned square footage. We correct any punch-list items and hand you the CO. The garage is now a legal dwelling unit. If this project is part of a full Home Additions & ADU in Westview scope, we sequence the remaining work so you’re not living in a construction zone longer than necessary.
The Spec Choices That Move Your Garage Conversion ADU
Every decision below changes how the space lives and what it costs. We don’t default to one grade. You choose.
- Slab strategy: keep versus replace. Existing 4-inch unreinforced slabs in Westview’s 1950s-1970s homes often won’t pass inspection for a habitable space. A new 6-inch reinforced slab with vapor barrier runs $8,000-$15,000 but eliminates moisture wicking and gives you a level floor for tile or LVP. Keeping the slab saves money upfront but may limit flooring options and requires careful moisture mitigation.
- Overhead door replacement wall: standard frame versus impact-rated assembly. Miami-Dade HVHZ requires impact-rated openings or permanent shutter protection. A standard 2×6 framed wall with insulated impact-rated door or fixed window assembly costs less than a custom architectural opening. If you want a folding glass wall or large slider, budget for the engineering and the product. Andersen and Pella both make HVHZ-approved systems, but they’re not entry-level pricing.
- Kitchen package: wet bar versus full cooktop. A wet bar with mini-fridge and microwave drawer keeps electrical loads modest and avoids gas routing. A full kitchen with 240V range, vented hood, and dishwasher requires more amperage and often triggers the service upgrade. For rental ADUs, we see homeowners split the difference with induction cooktops and combo washer-dryer units.
- HVAC: ducted mini-split versus central tie-in. A dedicated ductless mini-split gives the ADU its own thermostat and doesn’t load your existing system. Tying into central HVAC is cheaper if your current unit has capacity, but many Westview homes we work on have original or undersized systems that can’t handle another 400-600 square feet.
- Cabinetry and countertops: rental-grade versus owner-quality. For ADUs you’ll live in, KraftMaid or Wellborn semi-custom cabinets with Cambria quartz give you storage that wears well. For pure rental units, stock cabinet packages with solid surface tops hit the functional minimum without overspending. We stock both paths.
What Garage Conversion ADU Costs in Westview, FL
| Cost Component | Typical Range |
|---|---|
| Base garage conversion (existing slab/roof kept) | $30,000 - $50,000 |
| Slab replacement + foundation work | $8,000 - $15,000 |
| Electrical service upgrade to 200A | $3,500 - $6,500 |
| Impact-rated window/door assemblies | $4,000 - $12,000 |
| Full kitchen (cabinets, counters, appliances) | $8,000 - $18,000 |
| Full bath (shower, vanity, toilet, rough plumbing) | $6,000 - $14,000 |
| HVAC (mini-split or central extension) | $3,500 - $8,000 |
| Permit, plan review, and inspection fees (Miami-Dade) | $2,500 - $5,000 |
| Total project range | $30,000 - $80,000 |
Five factors push you toward the high end. First, slab replacement. Second, relocating the main electrical panel or upgrading service. Third, adding a full kitchen with gas rather than electric. Fourth, impact-rated custom openings instead of standard assemblies. Fifth, any structural repair once we open walls, common in Westview’s unreinforced block construction from the 1960s.
What’s included in our written estimate: all labor, rough and finish materials, permit expediting, and final cleaning. What’s typically separate: appliance packages, window coverings, and landscaping repair from equipment access. We itemize both so you’re not surprised.
What Westview Homes Specifically Do to This Job
Westview sits in unincorporated Miami-Dade County within Florida’s High-Velocity Hurricane Zone, and that designation changes everything about a garage conversion ADU here. Every product we specify, from the sheathing fasteners to the underlayment to the windows, must carry a Miami-Dade County Notice of Acceptance. Contractors working across the county line in Broward often miss this, and we’ve been called in more than once to correct a conversion that failed inspection because the original crew used standard-grade materials.
The housing stock in 33167 is almost entirely concrete block and stucco built during the 1950s-1970s suburban expansion. Original garages in these homes were never designed for habitation. Slabs are thin, uninsulated, and frequently cracked from decades of vehicle loading. Roof structures are often simple gable frames with 2×4 rafters and no ridge beam, adequate for a garage door but not for a ceiling loaded with insulation, drywall, and a mini-split air handler. When we pull the permit, Miami-Dade inspectors routinely require us to sister the rafters, add collar ties, and verify the existing tie beam can handle the new lateral loads.
Water is the other Westview-specific factor. The water table here can rise to within a few feet of grade after summer storms, and the porous Miami Limestone underneath doesn’t give you much margin. We never design below-grade mechanical rooms or storage in these conversions. Instead, we elevate critical systems and specify moisture-resistant materials throughout. The flat terrain also means no natural drainage slope. Your garage slab probably has pooling issues you’ve noticed during heavy rain. We address that with perimeter grading and, where needed, a French drain before we ever frame a wall.
Homeowners in Westview often pair a garage conversion with interior updates elsewhere in the house. If you’re considering a full kitchen overhaul or bath upgrade as part of the same project phase, our Cabinets & Countertops in Westview crew can coordinate finishes so the ADU doesn’t feel like an afterthought. Many also update flooring continuity between the main house and the new unit, which is where our Backsplash, Tile & Flooring in Westview team comes in. Keeping everything under one contractor eliminates the scheduling gaps that stretch projects out for months.
Serving Westview, FL - Our Local Coverage Area
We’re based in the Westview 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 Westview
Most conversions take 4 to 6 months total, with 10 to 14 weeks of actual construction. Miami-Dade plan review adds 3 to 4 weeks, and HVHZ structural comments can extend that if your home was built before 1992. Call (844) 665-0162 and we can give you a tighter timeline after seeing your garage.
Yes, absolutely. Unincorporated Miami-Dade requires full building, plumbing, electrical, and mechanical permits, plus zoning verification for setbacks and parking. The permit package must include HVHZ-compliant product approvals for every structural and envelope component. We handle the entire submittal and inspection schedule.
Sometimes, but rarely in Westview’s older housing stock. If your garage already has a sink and your electrical panel has spare capacity, you might avoid major rerouting. Most conversions need at least a new bathroom rough-in and often a 200-amp service upgrade. We determine this during the feasibility visit in Week 1.
The lowest-cost path keeps the existing slab and roof structure, uses a wet bar instead of a full kitchen, and opts for a ductless mini-split rather than central HVAC extension. Even at the lean end, budget $30,000 because Miami-Dade’s HVHZ requirements for impact-rated openings and structural upgrades are non-negotiable. Call (844) 665-0162 for a free estimate on your specific garage.
We warranty our workmanship for one year from certificate of occupancy. Manufacturer warranties apply to cabinets, countertops, windows, doors, and mechanical equipment. Because we work with name-brand products like KraftMaid, Wellborn, and Cambria, those material warranties transfer directly to you. We provide all warranty documentation at project closeout.
Ready to Convert Your Westview Garage?
We’ll walk your garage, check the slab and structure, and give you a written estimate with real numbers for your specific conversion. No deposit required to get started. Call (844) 665-0162 to schedule your free on-site consultation in Westview. Our Home Additions & ADU crew serves the full 33167 area and nearby communities including Pinewood, Opa-locka, and Gladeview.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Westview and South Florida homeowners since 2014.