Garage Conversion ADU in Sunset, FL: Scope, Timeline, and Cost
Converting an existing garage into an accessory dwelling unit in Sunset typically runs $30,000-$80,000 and takes 8-14 weeks from permit approval to final inspection. Most of our Sunset clients are looking to add a rentable studio or in-law suite without expanding their home’s footprint. Call (844) 665-0162 and we’ll walk your garage with you to determine whether a conversion makes sense for your property and budget.
How We Convert a Garage to an ADU in Sunset
We’ve refined this into five clear stages so you know what’s happening and when you need to make decisions.
Stage 1: Feasibility and existing conditions review (1-2 weeks)
We inspect your garage’s slab, roof structure, electrical panel capacity, and whether the existing space shares a wall with your main home. In Sunset, many 1960s-1980s CBS ranch homes have garages with flat roofs and original wood decking that won’t meet current Miami-Dade structural requirements. You’ll decide at this stage whether you’re pursuing a full kitchen and bath or a simpler kitchenette-and-half-bath layout. That choice determines your plumbing scope, which is usually the biggest cost driver.
Stage 2: Design, NOA verification, and permitting (4-8 weeks)
Our drawings specify every window, door, roofing component, and fastener with its Miami-Dade Notice of Acceptance number. We can’t substitute on the fly here, Miami-Dade inspectors verify NOA compliance against the approved plans. You’ll choose your window and door line at this stage, impact-rated is mandatory, and we typically spec from Andersen, Pella, or CGI depending on your budget and aesthetic. Plumbing and electrical plans get submitted simultaneously.
Stage 3: Structural prep and rough trades (2-3 weeks)
We strip the garage interior, raise the slab if needed for flood elevation compliance, and frame new interior walls. If your home is pre-1993, we upgrade roof-to-wall connections and add hurricane strapping where the garage roof ties into the main structure. This isn’t optional, it’s triggered by permit category. Electrical and plumbing rough-ins happen in parallel. You’ll do a walkthrough to confirm outlet, switch, and fixture locations before we close walls.
Stage 4: Insulation, drywall, finishes, and fixtures (2-3 weeks)
We install moisture-resistant insulation and drywall rated for South Florida humidity, then move to flooring, cabinetry, countertops, and trim. This is where your material choices show up. You’ll have already selected from our curated brand roster, KraftMaid or Wellborn for cabinetry, Cambria for countertops if you’re doing a full kitchen. We coordinate tile or LVP flooring installation, and our Backsplash, Tile & Flooring in Sunset crew handles this phase if it’s part of your scope.
Stage 5: Final inspection and punch list (1 week)
Miami-Dade building, plumbing, and electrical inspectors each sign off. We address any correction items immediately, most are minor labeling or access panel adjustments. You do a final walkthrough with our project lead, we hand over keys, NOA documentation, and permit closure. Total elapsed time from our first meeting to move-in ready: typically 14-22 weeks depending on permit queue.
The Options You’ll Choose Between for Your Garage Conversion ADU
- Full kitchen vs. kitchenette: A full kitchen with range, full-size refrigerator, and dishwasher adds $8,000-$18,000 but makes the unit truly rentable. A kitchenette with mini-fridge, microwave, and sink keeps you closer to the $30,000 range and works for guest use or short-term family stays. In Sunset’s rental market, full kitchens command roughly 30% higher monthly rates.
- Existing slab condition: Many Sunset garages sit on slabs poured in the 1970s with no moisture barrier. We can seal and tile over if structurally sound, or break out and repour if the slab has settled or cracked from groundwater intrusion. Breaking out adds $4,000-$9,000 but eliminates future moisture problems in a space this close to the Everglades water table.
- Bathroom scope: A half-bath fits most garage footprints without moving the main sewer line. A full bath with shower requires locating drain lines, which in 33173’s flat limestone terrain often means a sewage ejector pump if gravity flow isn’t achievable. That’s a $2,500-$5,500 addition but opens the unit to long-term rental.
- Separate meter or shared utilities: FPL permits a separate electrical meter for ADUs in Miami-Dade, but the service upgrade and meter installation runs $3,000-$7,000. Most Sunset homeowners start with sub-panel and shared meter, then convert later if rental income justifies it.
- Exterior integration: You’ll decide whether to match the garage door opening with new CBS infill and windows that blend with your home’s facade, or create a distinct entrance with a small covered porch. The latter improves curb appeal and tenant privacy but adds $3,000-$6,000 in framing and roofing.
Homeowners often pair this project with interior upgrades elsewhere in the home, and our Cabinets & Countertops in Sunset team can coordinate timing if you’re refreshing the main kitchen simultaneously.
What Garage Conversion ADU Costs in Sunset, FL
| Component | Typical Range |
|---|---|
| Basic garage conversion (kitchenette, half bath, finishes) | $30,000-$50,000 |
| Mid-range conversion (full kitchen, full bath, upgraded finishes) | $50,000-$65,000 |
| High-end conversion (structural slab work, separate systems, premium materials) | $65,000-$80,000 |
Five factors push your project up or down this range:
1. Existing garage condition: A dry, structurally sound garage with headroom above 8 feet starts at the low end. Sagging flat roofs, deteriorated wood decking, or slabs compromised by groundwater push you toward $60,000+ before you choose a single finish.
2. Plumbing relocation: If your main sewer line runs on the opposite side of the house, we’re running new lines or installing a pump system. That’s often the single biggest variable between a $38,000 job and a $62,000 job.
3. Electrical service capacity: Many 1970s Sunset homes have 100-amp panels. An ADU with full kitchen and HVAC typically requires 200-amp service. The upgrade is $2,500-$5,000 and must be coordinated with FPL.
4. Material grade: Builder-grade LVP, stock cabinetry, and standard fixtures keep costs controlled. Stepping up to engineered hardwood, KraftMaid semi-custom cabinets, and Cambria quartz adds $8,000-$15,000 but significantly improves durability and rental appeal.
5. Permit complexity: Pre-1993 structures trigger mandatory structural upgrades that post-1992 rebuilds avoid. We verify your home’s build year in the first meeting so you’re not surprised by this later.
Our written estimates include demolition, rough and finish carpentry, plumbing and electrical rough-in and trim, insulation, drywall, flooring, cabinetry, countertops, fixtures, paint, and permit fees. They do not include FPL service upgrades, separate water meter installation, window treatments, or appliances.
What Sunset Homes Specifically Do to This Job
Sunset sits in unincorporated Miami-Dade County within the corridor that bore the brunt of Hurricane Andrew’s 1992 destruction, leaving a neighborhood patchwork of pre-Andrew CBS homes with substandard roof-to-wall connections alongside post-1992 rebuilds that had to meet the newly overhauled Miami-Dade code. Any garage conversion on pre-1993 structures here triggers mandatory upgrades to hurricane strapping, impact-resistant openings, and structural connections that contractors in neighboring Broward County simply don’t encounter at the same rate or under the same scrutiny.
The 33173 corridor’s dominant housing stock, 1960s-1980s single-story CBS ranch homes built during Miami-Dade’s post-war suburban expansion westward toward the Everglades, presents specific challenges. Many retain original flat or low-slope roofs with aging wood decking that pre-dates Miami-Dade’s post-Andrew structural sheathing and fastening requirements. When we convert a garage in Sunset, we’re often rebuilding that roof structure to current standards, not just finishing the interior.
Sunset’s position just east of the Everglades on flat oolitic limestone at near-zero elevation gives it one of the shallowest water tables in the county. Excavation for any slab modification immediately encounters groundwater, and standing water after summer thunderstorms regularly undermines poorly compacted fill. We account for this in our slab assessment, a step that out-of-county crews sometimes skip, leading to callbacks for moisture intrusion.
Miami-Dade’s product-approval system requires a Miami-Dade Notice of Acceptance for virtually every structural and envelope component. We verify NOA numbers before ordering, a workflow step that routinely catches products that are code-compliant elsewhere but not approved here. This is why we keep our Sunset projects in-house rather than subcontracting to crews unfamiliar with Miami-Dade’s specific requirements.
If you’re considering this as part of a full property expansion, see our broader Home Additions & ADU in Sunset page for detached ADU and room addition options. Our Home Additions & ADU service hub covers our full approach across South Florida.
Serving Sunset, FL - Our Local Coverage Area
We’re based in the Sunset 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 Sunset
From permit submission to final inspection, typically 8-14 weeks. Permitting itself takes 4-8 weeks in Miami-Dade depending on backlog, and pre-1993 homes often require one additional plan review cycle for structural upgrades. Call (844) 665-0162 and we can check current queue times and give you a realistic schedule for your specific property.
Yes, absolutely. Miami-Dade County requires building, plumbing, and electrical permits, and the work must comply with the Florida Building Code plus Miami-Dade’s amended requirements for impact resistance and structural connections. We handle all permit drawings, submissions, and inspections as part of our standard process.
Sometimes, but rarely for a functional ADU. Most Sunset garages have minimal electrical and no plumbing. A true ADU needs a kitchen sink and bathroom, which means new water, drain, and vent lines. If you’re doing only a bedroom or office with a half-bath, we may tap existing lines if they’re nearby, but full independence requires new infrastructure.
Garage conversion is almost always cheaper. You’re working within an existing footprint and foundation, avoiding land coverage calculations and new utility trenching. Detached ADU construction in Sunset starts around $90,000 and runs to $220,000. Garage conversion gives you rental income potential at roughly one-third the entry cost.
We warranty our workmanship for one year from substantial completion. Manufacturer warranties apply to specific products, Cambria countertops carry a lifetime limited warranty, KraftMaid cabinetry has a limited lifetime warranty on defects. We provide all warranty documentation at project closeout. For warranty service questions during or after your project, call (844) 665-0162 and we’ll coordinate directly with the manufacturer if needed.
Get a Free On-Site Estimate for Your Garage Conversion ADU in Sunset
We’ll walk your garage, check your home’s build year and existing conditions, and give you a written estimate with real numbers, not a range that changes later. Call (844) 665-0162 to schedule. Raymond Estevez or a senior project lead will meet you on-site, answer your questions about permitting and timeline, and outline what your specific property needs to become a permitted, rentable ADU in Sunset.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Sunset and South Florida homeowners since our founding.