What Does a Garage Conversion ADU in Plantation Actually Involve?
A garage conversion ADU in Plantation transforms your existing attached or detached garage into a permitted, habitable living unit with its own kitchenette, bathroom, sleeping area, and separate entrance. Most projects in Plantation take 10 to 16 weeks from permit approval to final inspection, with the build phase typically running 8 to 12 weeks once demolition begins. In this market, you’re looking at roughly $30,000 to $80,000 depending on whether your garage is already conditioned, how much plumbing and electrical needs rerouting, and whether the structure needs wind-mitigation upgrades to meet current Florida Building Code. Call (844) 665-0162 and we’ll walk your specific garage with you, no charge.
How We Convert a Garage to an ADU - Start to Finish
We’ve done enough of these in Plantation 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 review (1-2 weeks)
We measure your garage slab, roof structure, and existing electrical panel capacity. In Plantation’s 1960s-1970s CBS homes, we regularly find the main panel is a 100-amp Federal Pacific or Zinsco that won’t support an additional dwelling unit. You’ll decide here whether to upgrade the panel now or scope the ADU as a lower-amperage studio. We also verify your garage slab elevation relative to the finished floor height you’ll need for proper drainage and threshold transitions.
Stage 2: Design, permit drawings, and Broward County submission (3-6 weeks)
Our architect produces plans showing the new layout, egress window placement, fire separation between the ADU and main house, and tie-down connections for wind-load compliance. You’ll choose your kitchenette configuration, bathroom layout, and whether to add a stackable washer/dryer. We submit to Broward County’s Building Code Services; Plantation falls under their jurisdiction, and garage conversions trigger a full plan review including structural, electrical, plumbing, and mechanical disciplines.
Stage 3: Demolition and rough prep (1-2 weeks)
We strip the garage to studs, remove the overhead door and frame in a proper wall assembly, and cut the slab for any new plumbing drains. If your garage has a flat or low-slope roof - common in the older subdivisions along Broward Boulevard - we assess whether the existing structure can support insulation and a new ceiling assembly or if we need to reframe the roof plane for proper drainage and code-minimum R-values.
Stage 4: Rough trades and inspections (3-5 weeks)
Electrical, plumbing, and HVAC rough-in happen in sequence, each followed by a county inspection. You’ll make your final selections on fixtures, flooring, and cabinetry during this window so materials arrive before we close walls. In Plantation, we often need to coordinate the rough inspections around the homeowner’s schedule since the main house remains occupied.
Stage 5: Finish work, final inspection, and certificate of occupancy (2-3 weeks)
Drywall, paint, flooring, cabinetry, countertops, and fixture installation. We schedule the final Broward County inspection and address any punch items. Once the certificate of occupancy issues, your ADU is legally rentable or usable as independent living space.
The Options You’ll Choose Between for Your Garage Conversion ADU
- Stick-built interior vs. prefab modular unit: We can frame and finish conventionally, or for detached garages with adequate access, drop in a prefab unit from partners like Mighty Buildings or Boxabl. Prefab cuts on-site build time by 40-60% but requires crane access and a slab rated for the module’s load path. Stick-built gives you layout flexibility and typically costs less for smaller footprints under 400 square feet.
- Plumbing configuration - extend from main house or independent service: Tapping into your existing supply and sewer lines runs $3,500-$8,000 if the garage is within 25 feet of the main stack. An independent water meter and sewer connection doubles that but lets you bill utilities separately to a tenant. Most Plantation homeowners on single-family lots choose the tie-in.
- Kitchenette scale - wet bar vs. full cooking: A microwave, mini-fridge, and sink keeps costs down and avoids grease-duct requirements. Adding a range with proper ventilation and a 240V circuit pushes you toward a full kitchen spec but makes the unit genuinely independent for long-term rental.
- Impact-rated fenestration vs. standard replacement windows: Florida Building Code requires impact-rated or shutter-protected openings in Broward County. We source from Andersen, PGT, and CGI product lines. Standard replacement windows won’t pass inspection here, so this isn’t optional - but you choose the aesthetic tier and operating style.
- Floor finish - polished concrete, luxury vinyl plank, or tile: Polished concrete works with your existing slab and handles the humidity well. LVP installs faster and feels warmer underfoot. Tile is the most durable for rental use but adds weight your slab must be rated to carry, which matters in some of Plantation’s older post-tension slabs.
What Garage Conversion ADU Costs in Plantation, FL
| Component | Typical Range |
|---|---|
| Garage Conversion ADU (total project) | $30,000 - $80,000 |
| Electrical panel upgrade (if needed) | $2,500 - $5,500 |
| Plumbing rough-in and fixtures | $4,000 - $12,000 |
| HVAC (mini-split system) | $3,500 - $7,500 |
| Impact windows/door | $3,000 - $9,000 |
| Kitchenette cabinetry and counters | $3,500 - $10,000 |
Five factors push your number up or down:
1. Existing garage condition. A finished, air-conditioned garage with a 200-amp panel and modern roof starts near the bottom. An unconditioned, single-door garage with a failing flat roof, asbestos-containing materials, and a 100-amp panel pushes toward the top.
2. Plumbing distance and complexity. Moving waste lines across a slab is the single biggest variable. If your main bathroom stack sits on the wall shared with the garage, you’re in good shape. If we need to trench across the slab or pump uphill to the sewer lateral, costs rise fast.
3. Structural and wind-mitigation requirements. Many Plantation garages from the 1960s-1970s weren’t built with the continuous load path or tie-down straps required today. Adding hurricane clips, straps, and possibly reframing roof-to-wall connections is code-mandated and non-negotiable.
4. Material grade selections. A wet-bar kitchenette with stock cabinetry and solid-surface counters runs a fraction of a full kitchen with custom KraftMaid or Wellborn cabinetry and Cambria or Silestone quartz. We quote multiple tiers so you see the trade-offs.
5. Permit scope and HOA coordination. Some Plantation subdivisions, particularly the gated communities west of University Drive, require architectural review board approval before Broward County will accept permit applications. That adds 2-4 weeks and sometimes revised drawings.
Our written estimates itemize labor, materials, permit fees, and a line for foreseeable contingencies. They don’t include appliance packages, window treatments, or landscaping restoration outside the garage footprint.
What Plantation Homes Specifically Do to This Job
Plantation was master-planned from the 1950s onward with its heaviest residential build-out in the 1960s-1970s, leaving a dense stock of single-story CBS homes now 50-60 years old. Florida’s post-Hurricane Andrew building code overhaul combined with insurance-carrier ultimatums is forcing owners of these aging homes into permit-required roof replacements and wind-mitigation retrofits at scale - making code-compliant structural renovation the dominant construction driver in Plantation in a way that distinguishes it from newer planned cities like Weston just to the south.
The older subdivisions along Broward Boulevard and the corridors east of University Drive contain large numbers of flat-roof and low-slope CBS homes whose roofing systems are simultaneously reaching insurance-mandated replacement age. When we convert a garage in these neighborhoods, we almost always find the garage roof is tied into the main house roof assembly with a shared low-slope membrane or built-up system that’s already failing. That means the garage conversion ADU often becomes part of a full Home Additions & ADU in Plantation scope that includes re-roofing the main house to maintain a unified assembly and satisfy the insurer.
The same shallow limestone aquifer that puts Plantation’s water table within one to two feet of grade during wet season means any slab cutting for plumbing needs dewatering coordination with Broward County surface water management. We’ve learned to schedule that rough work for the drier winter months when possible. And because the vast majority of these homes still have original jalousie or single-pane aluminum windows, the garage conversion’s impact-rated fenestration upgrade frequently triggers a cascading decision to replace the main house windows too - something we handle through our windows and doors crew with product lines from Andersen, Pella, Marvin, and impact-rated specialists like PGT and CGI.
Homeowners often pair a garage conversion with interior finish work elsewhere in the house, and our Home Additions & ADU crew coordinates directly with our interior teams on Cabinets & Countertops in Plantation and Backsplash, Tile & Flooring in Plantation to keep one timeline and one point of accountability. We serve Plantation and surrounding cities including Fort Lauderdale, Broadview Park, Lauderhill, and Lauderdale Lakes from our Fort Lauderdale base.
Serving Plantation, FL - Our Local Coverage Area
We’re based in the Plantation 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 Plantation
Most projects take 10 to 16 weeks from permit approval to certificate of occupancy, with the build phase running 8 to 12 weeks. Broward County’s plan review typically adds 3 to 6 weeks before we can start construction, and HOA architectural review in some Plantation subdivisions can add another 2 to 4 weeks. Call (844) 665-0162 and we’ll check your specific address for any HOA or historic overlay requirements.
Yes, absolutely. Garage conversion ADUs require full building permits through Broward County Building Code Services, with separate inspections for structural, electrical, plumbing, mechanical, and final occupancy. Plantation does not allow unpermitted dwelling units, and renting an unpermitted ADU exposes you to fines and insurance denial. We handle the entire permit submission and inspection scheduling as part of our scope.
Sometimes, but rarely completely. Most Plantation garages have only a single 120V circuit and no plumbing, so you’ll need at minimum new electrical service for HVAC, kitchenette, and bathroom loads, plus water and sewer lines for the ADU to be legally habitable. If your garage already has a utility sink and 240V for a workshop, you may reduce some rough-in costs, but code still requires independent metering or sub-panel configuration for a dwelling unit.
The lowest-cost path is a studio layout with a wet bar instead of full kitchen, a three-quarter bath with a shower pan rather than tiled surround, polished concrete floors, and tying into existing plumbing and electrical where the garage sits adjacent to the main house’s utility core. Even at the lean end, budget $30,000 plus permits - anything significantly less in this market typically means corners on code compliance or no proper HVAC. We quote honest numbers; call (844) 665-0162 for a free on-site assessment.
We warranty our workmanship for one year from certificate of occupancy, with manufacturer warranties passing through on all materials and fixtures - typically 10 years on cabinetry, lifetime on certain window lines, and varying coverage on appliances you select. Our written estimate specifies every warranty term before you sign. We don’t deal in vague promises; every protection is documented.
Get a Free On-Site Estimate for Your Garage Conversion ADU
We’ll walk your garage, check your panel and slab conditions, and give you a written estimate with real numbers for your specific situation in Plantation. No pressure, no generic ranges - just what your job actually requires. Call (844) 665-0162 or reach out through our site to schedule. Raymond Estevez and our team will handle your project from first measurement through final inspection.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Plantation since our Fort Lauderdale founding.