Garage Conversion ADU in Kendall West: What It Costs and How Long It Takes
A garage conversion ADU in Kendall West transforms your existing attached or detached garage into a permitted dwelling unit with its own kitchen, bath, sleeping area, and separate entrance. Most projects we handle here run 10-14 weeks from permit approval to final inspection, with costs typically landing between $45,000 and $130,000 depending on whether you’re keeping the existing slab and roof structure or essentially rebuilding from the studs. Call (844) 665-0162 and we’ll walk your specific garage in Kendall West to give you a written estimate with line-item pricing.
Kendall West’s post-Hurricane Andrew housing stock gives these conversions a particular rhythm. The CBS construction, flat or low-pitch tile roofs, and shallow water table mean we’re often working within an existing envelope rather than expanding it, which keeps some projects leaner than you’d expect. But the High Velocity Hurricane Zone codes also mean every opening, every tie-down, and every utility connection gets scrutinized at inspection in ways that add both time and rigor.
How We Convert a Garage to an ADU in Kendall West
We’ve refined this into five distinct phases. Homeowners who understand the sequence make faster decisions, and faster decisions keep permits from expiring.
Phase 1: Feasibility and Measure (Week 1)
We walk the garage, photograph the existing slab, check ceiling height, and confirm setback distances to property lines. In Kendall West, we also verify whether your subdivision’s original builder package used 8-foot or 9-foot trusses, because that determines whether we can achieve the 7-foot-6 minimum finished ceiling height without dropping the floor or raising the roof. You’ll decide at this stage whether you want a full kitchen or a kitchenette, whether the bathroom needs a tub or just a shower, and whether you’re adding a separate HVAC system or tapping the main house. We deliver a schematic and a fixed-price proposal within five business days.
Phase 2: Permitting and Engineering (Weeks 2-6)
Our drawings go to Miami-Dade for HVHZ review. Because Kendall West sits in a FEMA Special Flood Hazard Zone, any conversion that triggers “substantial improvement” rules, meaning the project value exceeds 50% of your structure’s assessed value, requires base-flood-elevation compliance. We handle the elevation certificate review and any necessary flood-vent calculations. You’ll approve final electrical and plumbing riser diagrams during this window. Permit turnaround in Miami-Dade currently runs 3-4 weeks for residential additions of this scope.
Phase 3: Demolition and Rough Prep (Week 1 on-site)
We strip the garage to studs, remove the overhead door and frame in a proper wall assembly with impact-rated openings if required by your specific wind-borne debris zone. The existing slab gets tested for moisture intrusion, common in Kendall West where the water table sits 18-24 inches below grade. If the slab fails the calcium chloride test, we specify a moisture-mitigation system before any flooring goes down. You’ll choose your final window and door schedule at this point, we stock Andersen, Pella, Marvin, Milgard, Jeld-Wen, Simonton, PGT, and CGI, and we order long-lead items.
Phase 4: Systems and Finishes (Weeks 2-8 on-site)
Electrical panel upgrade if needed, plumbing rough-in, HVAC mini-split or ducted extension, insulation to R-30 ceiling and R-13 walls per current Miami-Dade energy code, then drywall, flooring, cabinets, countertops, and fixtures. In Kendall West, we see a lot of homeowners pair this phase with interior upgrades to the main house, our Cabinets & Countertops in Kendall West crew can match the ADU kitchen to a main-house refresh if you’re thinking holistically. You’ll make your final material selections by week 2 of this phase, any later and we risk permit expiration.
Phase 5: Inspections and Closeout (Week 9-10 on-site)
Rough electrical, plumbing, mechanical, framing, and insulation inspections, then final trades and the certificate of occupancy walkthrough. Miami-Dade’s HVHZ inspectors are thorough, we build in a buffer for re-inspection on at least one trade. You’ll receive your CO, warranty documentation, and a final walkthrough punch list signed off before we consider the job complete.
The Options You’ll Choose Between for Your Kendall West Garage Conversion ADU
Every decision below moves your number. We lay out the honest trade-offs so you’re not guessing.
- Kitchenette vs. full kitchen: A kitchenette with a mini-fridge, two-burner cooktop, and single-bowl sink runs $4,000-$7,000 in the ADU. A full kitchen with full-size appliances, custom or semi-custom cabinets, and stone countertops pushes $12,000-$22,000. For rental income in Kendall West, the full kitchen recoups faster. For family use or aging parents, the kitchenette often suffices.
- Wet bath vs. full bath with shower: A wet bath, everything in one waterproof room, saves space and roughly $3,000-$5,000. A full bath with a separate shower, toilet, and vanity feels conventional and rents easier. In the 1990s-era garages common in Kendall West, ceiling height often dictates this choice, a wet bath needs less vertical clearance for shower framing.
- Mini-split HVAC vs. ducted extension: A mini-split system, $3,500-$6,500 installed, gives independent climate control and avoids overloading the main house’s aging compressor. Extending existing ductwork costs less upfront, $1,500-$3,500, but many Kendall West homes from the 1990s have undersized original systems that can’t handle the additional load.
- Impact-rated vs. standard windows and doors: If your garage faces an exposure that requires HVHZ wind-borne debris protection, impact-rated openings add $2,000-$5,000 but eliminate shutter installation. We verify your specific exposure requirement during feasibility, it’s not uniform across all of 33193.
- Polished concrete vs. luxury vinyl plank vs. tile: The existing slab can be polished and sealed for $3-$5 per square foot, honest and industrial. Luxury vinyl plank, $4-$8 per square foot installed, handles the moisture risk better in Kendall West’s shallow water table conditions. Porcelain tile, $7-$14 per square foot, lasts longest but amplifies slab imperfections that are common in original garage pours.
Homeowners often ask about pairing flooring continuity with interior work. If you’re also updating the main house, our Backsplash, Tile & Flooring in Kendall West team can source matching materials across both spaces.
What Garage Conversion ADU Costs in Kendall West, FL
| Project Scope | Price Range |
|---|---|
| Basic garage conversion ADU (existing slab, kitchenette, wet bath, mini-split, standard finishes) | $45,000 - $75,000 |
| Mid-range conversion (full kitchen, full bath, upgraded flooring and fixtures, impact-rated openings) | $75,000 - $105,000 |
| High-end conversion (structural modifications for ceiling height, custom cabinetry, premium countertops, full utility separation) | $105,000 - $130,000 |
Five variables push you toward the high or low end. First, existing condition: a garage with dry slab, intact roof, and adequate ceiling height starts lean. Water-damaged framing, a failing flat tile roof, or insufficient headroom adds $8,000-$20,000 before finishes begin. Second, utility relocation: moving the main electrical panel, adding a separate water meter, or running new sewer lateral to the street, common when you’re creating a truly independent unit, adds $5,000-$15,000. Third, material grade: stock cabinets and laminate counters versus KraftMaid or Wellborn cabinetry with Cambria, Silestone, or Caesarstone surfaces can swing the finish budget by $10,000 or more. Fourth, permit scope: if your project triggers substantial improvement and flood-elevation compliance, engineering and additional inspections add $3,000-$7,000. Fifth, HOA or architectural review: some Kendall West subdivisions require separate approval before Miami-Dade sees the plans, adding 2-4 weeks and $500-$1,500 in documentation.
Our written estimates include demolition, rough and finish carpentry, electrical, plumbing, HVAC, insulation, drywall, flooring, cabinets, countertops, fixtures, and permit fees. They do not include separate utility meter installation, landscape repair, or main-house upgrades you may choose to add. We specify every line item so you know where your money goes.
What Kendall West Homes Specifically Do to This Job
Kendall West was built out almost entirely after Hurricane Andrew leveled the broader Kendall area in 1992. That means the housing stock in 33193 is dominated by 1990s-2000s CBS homes constructed to Miami-Dade’s newly overhauled High Velocity Hurricane Zone codes, the strictest in the continental United States. For garage conversion ADU work, this context is everything.
The good news: these structures are genuinely robust. Concrete block and stucco walls, roof-to-wall strap tie-downs, and impact-resistant openings are standard, not upgrades. We rarely encounter the unreinforced masonry or single-wythe block that complicates conversions in older eastern Kendall neighborhoods. The challenge: any modification to that engineered envelope requires re-permitting under HVHZ rules that have only grown more stringent. A garage door opening converted to a living-space wall isn’t just a framing change, it’s a pressure-envelope modification that needs engineered drawings and inspection sign-off.
The shallow water table and porous oolitic limestone beneath Kendall West also shape our approach. Original garage slabs were often poured without full vapor barriers because the builders assumed rapid drainage. In practice, we’ve seen moisture wick upward through slabs that test dry in winter but fail in summer. We test every slab, and we specify moisture mitigation more aggressively here than in higher-elevation suburbs where drainage actually works.
Finally, the mass-phase permitting of the 1990s means entire subdivisions share identical roof-truss systems and tile profiles, typically Monier or Eagle flat-profile concrete tile. When a garage conversion requires roof modification or when we’re tying into the existing roofline for a dormer or raised ceiling, we can often source matching materials without custom orders. A contractor who doesn’t know the original builder packages wastes weeks guessing.
If you’re considering this as part of a full Home Additions & ADU in Kendall West project, we coordinate the garage conversion with any simultaneous room additions or exterior work under one permit umbrella and one project manager.
Serving Kendall West, FL - Our Local Coverage Area
We’re based in the Kendall West 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 Kendall West
Most projects take 10-14 weeks from permit approval to certificate of occupancy, with permitting itself adding 3-6 weeks depending on Miami-Dade’s current queue and whether flood-zone compliance is triggered. The actual construction moves faster than a ground-up build because we’re working within an existing structure. Call (844) 665-0162 and we can give you a tighter timeline once we see your specific garage and pull your property’s permit history.
Yes, absolutely, and it’s not a simple homeowner permit. A garage conversion ADU requires Miami-Dade building, electrical, plumbing, and mechanical permits, plus HVHZ engineering review for any envelope modifications. If your project exceeds 50% of your structure’s assessed value, FEMA flood-zone compliance also applies. We handle the entire permit package as part of our standard process.
You can keep some existing infrastructure, but you’ll almost always need electrical upgrades. Most 1990s-era Kendall West garages were wired for a door opener and a few receptacles, inadequate for a dwelling unit’s kitchen, bath, and HVAC loads. Plumbing is only present if you had a utility sink, so the bathroom and kitchen lines are new by definition. We design to minimize trenching and slab penetration given the shallow water table.
Typically yes, by 30-50%. A garage conversion ADU reuses foundation, walls, and roof structure, while a detached unit starts from dirt with new footings, framing, and roofing. Our detached ADU construction runs $90,000-$220,000 versus $45,000-$130,000 for garage conversions. The trade-off is that a detached unit offers more privacy and rental income potential, while a garage conversion is faster and less disruptive to your property.
We warranty our workmanship for one year from certificate of occupancy, and all materials carry their manufacturer warranties, ranging from 10-year cabinet finishes to lifetime coverage on some window and door products. We register warranties in your name and provide documentation at closeout. For specifics on your material selections, ask during your estimate walkthrough.
Ready to Convert Your Kendall West Garage?
Call (844) 665-0162 to schedule a free on-site estimate. We’ll measure your garage, check your slab and ceiling height, review your property’s permit and flood-zone status, and deliver a written proposal with line-item pricing within five business days. No deposit required to get started, and you’ll speak directly with our Home Additions & ADU team, not a sales closer. We serve Kendall West and surrounding communities including Kendale Lakes, Country Walk, The Hammocks, and The Crossings.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Kendall West and South Florida.