What a Garage Conversion ADU in Plantation Actually Costs and How Long It Takes
A garage conversion ADU in Plantation typically runs between $30,000 and $80,000 and takes 10 to 16 weeks from the day we pull the permit. That’s the real range for turning an existing attached or detached garage into a fully permitted, independent living unit with its own kitchen, bath, entrance, and utility meter. Call us at (844) 638-7249 and we’ll give you a written, line-item estimate for your specific garage, no B-game numbers and no change-order surprises later.
How We Convert a Garage Into an ADU in Plantation, Step by Step
Every garage conversion follows the same structural logic, but the Plantation homes we work on are overwhelmingly CBS construction from the 1960s through the mid-1980s. That block-and-stucco shell is a good starting point. Here’s how the job moves, stage by stage.
Stage 1: Feasibility and design (2-3 weeks). We measure the existing slab, ceiling height, wall locations, and electrical panel capacity. A lot of Plantation garages were built with 8-foot flat ceilings and a single 15-amp circuit, and code requires a minimum ceiling height and a load center sized for a full dwelling unit. We pull the original building card from Broward County records, check the setback and lot coverage limits against the city’s zoning map, and draw a floor plan that gives you a compliant studio or one-bedroom layout. You choose the kitchen and bath fixture locations during this stage, and we lock the permit submittal package.
Stage 2: Demolition and rough opening mods (1-2 weeks). The garage door comes out, the opening gets framed and sheathed to match the existing wall plane, and we cut any new window or exterior door openings. On a CBS garage, cutting a new opening means renting a concrete saw and setting a reinforced lintel, not just popping out drywall. We also saw-cut the slab where new drain lines need to run. Plantation sits on a limestone shelf with a seasonally high water table, so any sub-slab plumbing excavation has to get the invert depth approved by the Broward County inspector before we backfill.
Stage 3: Rough-in: plumbing, electrical, and mechanical (2-3 weeks). This is where the garage stops being a garage. We run new supply and drain lines, set the shower pan or tub, pull new circuits for the kitchen appliances and HVAC mini-split, and install the subpanel if the main panel was undersized. A lot of Plantation homes still have their original Federal Pacific or Zinsco panels, and Broward County won’t sign off on an ADU tied to an obsolete panel, so a service upgrade often happens here. You’ll choose your mini-split brand and capacity during this stage, and we rough in the ductless wall unit location.
Stage 4: Insulation, drywall, and finishes (3-4 weeks). We insulate the walls and ceiling to the Florida Building Code’s R-value requirements, hang and finish drywall, paint, and install the flooring. If you’re converting a detached garage, we also insulate the slab edge and address any moisture intrusion through the block walls, a common issue in older Plantation neighborhoods where the original waterproofing has long since degraded. You’ll choose your flooring material, cabinet finish, countertop, and backsplash tile during this stretch.
Stage 5: Trim-out, fixtures, and final inspections (1-2 weeks). We install the kitchen cabinets, countertops, bathroom vanity, lighting, plumbing fixtures, and appliances. The Broward County building inspector and the fire marshal both need to sign off on the completed ADU, including a separate egress path and hardwired smoke and CO detectors. Once we pass final, you have a legal, rentable, insurable dwelling unit added to your property’s recorded square footage.
The Options You’ll Choose Between on a Garage Conversion ADU
No two Plantation garage conversions come out the same because the existing structure dictates what’s possible. Here are the decisions that shape the project and the budget.
- Attached versus detached garage. An attached conversion shares one or two walls with the main house and often piggybacks on the existing electrical service. A detached garage needs its own subpanel and a longer trench for utilities, which adds $3,000-$8,000 depending on the run length and how much limestone we hit. The upside of a detached conversion is complete acoustic and privacy separation.
- Studio versus one-bedroom layout. A studio keeps the living and sleeping space open and fits within a standard two-car garage footprint without adding square footage. A one-bedroom requires framing a separate sleeping room with an egress window, which costs more but makes the unit attractive to a broader set of tenants or family members.
- Kitchen scale: kitchenette versus full galley. A kitchenette with a two-burner cooktop, undercounter fridge, and a single-basin sink satisfies code at the lower end. A full galley kitchen with a four-burner range, dishwasher, and standard-depth fridge runs the plumbing and electrical budget higher and may require a dedicated 40-amp circuit.
- Mini-split versus tying into the main HVAC. Most Plantation homes have a central air handler sized only for the original conditioned square footage. Adding 400-600 square feet of ADU usually requires a separate ductless mini-split system. That adds $3,500-$6,000 but keeps the ADU on its own thermostat and avoids overworking the main unit.
- Flooring: luxury vinyl plank versus tile. LVP installs directly over the existing slab, costs less, and handles the moisture that moves through a slab-on-grade floor in South Florida’s wet season. Tile feels cooler underfoot and lasts longer but costs more per square foot and requires a flatter slab prep. Both are common choices in Plantation ADUs.
What a Garage Conversion ADU Costs in Plantation, FL
A garage conversion ADU in Plantation runs $30,000-$80,000, with most single-car conversions landing between $35,000 and $55,000 and larger two-car conversions with a full kitchen and separate bedroom pushing past $60,000. The finish level and the condition of the existing garage slab, walls, and roof deck are what move the number most.
What pushes a job toward the $30,000 end: a single-car attached garage in good structural condition, keeping the existing slab and roof structure, a studio layout with a kitchenette, no panel upgrade, and LVP flooring throughout.
What pushes a job toward the $80,000 end: a detached two-car garage needing slab repair, a full galley kitchen, a separate bedroom with an egress window, a mini-split system, a main panel upgrade from 100-amp to 200-amp, tile flooring, and a longer utility trench through Plantation’s limestone shelf.
Every estimate we write is a fixed-price, line-item document. It includes all materials, labor, permit fees, and the two to three rounds of Broward County inspections the job requires. It does not include impact fees, which Plantation assesses based on the new square footage, or any HOA architectural-review fees your neighborhood association charges. We’ll flag both of those during the feasibility stage so you know the all-in number before the permit gets submitted.
And because the job is an ADU, not a simple remodel, a large share of the line items are tied to getting the structure to dwelling-unit code: insulation, egress, smoke detection, separate metering, and fire separation between the ADU and the main house. Those are non-negotiable and they’re what separate a legal ADU from an unpermitted garage apartment that creates liability down the road.
What Plantation Homes Specifically Do to This Job
Plantation’s housing stock is overwhelmingly CBS tract homes built between the late 1950s and the mid-1980s, long before Hurricane Andrew forced the 1992 code overhaul. That means every garage we open up here has a concrete-block shell that’s structurally sound but electrically obsolete and thermally uninsulated. We almost always find an undersized electrical panel, no vapor barrier under the slab, and zero insulation in the block cavities. Fixing those three things is the quiet bulk of the budget on a Plantation garage conversion, and it’s what separates a build that holds up from one that develops moisture and electrical problems two wet seasons in.
The permitting reality matters too. Plantation falls under Broward County’s building jurisdiction, which sits at a middle-ground wind-load threshold, stricter than Palm Beach County but not as exhaustive as Miami-Dade’s High-Velocity Hurricane Zone. Contractors who work regularly in Plantation know exactly which wind-mitigation details the county plan reviewer will flag and which ones clear on the first submittal. That institutional knowledge shaves two to three weeks off the permitting timeline compared to a crew that’s learning Broward’s thresholds on the fly. If you live in a neighborhood like Plantation Acres or Jacaranda, where lots are larger and detached garages are common, the trenching and utility-separation work also tends to be more involved, and we’ll walk you through that during the site visit.
Most Plantation subdivisions were built in deliberate phases by a handful of developers, so entire blocks share the same garage footprint and construction vintage. We’ve converted garages in neighborhoods across the city, from the older sections east of University Drive to the newer planned developments further west. The consistent CBS shell is an advantage. The original electrical and the lack of slab-edge waterproofing are the two things we address on nearly every one.
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 Questions About Garage Conversion ADU in Plantation
Yes. A garage conversion into a dwelling unit requires a building permit, electrical permit, plumbing permit, and mechanical permit, all submitted to and approved by Broward County’s Building Department. Plantation also requires zoning approval to confirm the ADU meets setback, lot coverage, and parking requirements. Skipping permits creates a legally uninhabitable unit that can’t be rented, insured, or counted in a future home appraisal.
Plan on 10 to 16 weeks from permit issuance to final inspection. The variables that stretch the timeline are the Broward County inspection backlog during hurricane season (June through November), the need for a main-panel upgrade, and any unexpected slab or roof-deck repairs we uncover during demolition. We’ll give you a week-by-week schedule before we start and update it every Friday.
Most Plantation garages sit on a 4-inch unreinforced slab that was poured when the house was built. That slab is fine for parking a car but needs to be evaluated for a dwelling unit. We check for cracks, spalling, and moisture wicking, and we may need to saw-cut and repour sections where new plumbing runs. If the slab has settled or heaved due to the high water table, we’ll recommend mudjacking or a structural overlay, which adds cost but prevents floor failures later.
It won’t change unless you change the scope or we uncover a condition that no contractor could have reasonably seen during the estimate, like a corroded main sewer line four feet under the slab. If that happens, we stop work, show you photos and a written change order with a fixed price, and wait for your approval before we touch anything. No surprises, no “while we’re at it” upcharges. Our estimates are built to be complete, and our 730-Day Done Right Promise covers the workmanship on everything we install.
Yes, a permitted garage conversion ADU adds recorded square footage and a second rentable dwelling unit to the property. In Plantation, where the housing stock is aging and the cost of a tear-down rebuild keeps climbing, adding a legal ADU is one of the highest-return renovations a homeowner can make. The key is the permit, an unpermitted conversion is a liability at resale, not an asset. We pull the permit, pass the inspections, and hand you a closed-out job card.
Get a Fixed-Price Estimate for Your Garage Conversion ADU in Plantation
We’ll come out to your home in Plantation, measure the garage, walk the existing electrical and plumbing, and give you a written estimate that covers the whole job, permits, materials, labor, and inspections. No vague ranges and no follow-up calls trying to close you. This is often one piece of a larger vision, some homeowners pair it with a Home Additions & ADU in Plantation project, and our team handles the full scope from foundation to finish. A garage conversion also opens up interior finish work like Cabinets & Countertops in Plantation and Backsplash, Tile & Flooring in Plantation, and we coordinate those trades under one schedule and one warranty. Call (844) 638-7249 to schedule your free on-site estimate with our Home Additions & ADU team. We answer the phone with a live person, 24/7, and we’ll have a background-checked, uniformed estimator at your door ready to give you real numbers you can plan around.
Written by Derek Hollenbeck, Owner at Groundwork Construction Co., serving Plantation home additions and ADU projects with fixed pricing and the 730-Day Done Right Promise.