How Much Does a Garage Conversion ADU Cost in Royal Palm Beach?
A garage conversion ADU in Royal Palm Beach transforms an 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 $30,000-$80,000, with timeline typically 8-14 weeks from permit pull to final inspection. Call (844) 665-0162 and we’ll walk your specific garage and give you a written estimate with no obligation.
How We Convert a Garage into an ADU, Start to Finish
We’ve done enough of these in Royal Palm Beach to know where the friction hides. Here’s the actual sequence, what you’re deciding at each point, and how long each stage takes.
Stage 1: Feasibility and zoning check (3-5 days)
We measure your garage footprint, check setbacks against Palm Beach County property records, and verify your HOA covenants. Many Royal Palm Beach villages, especially the original 1970s-1990s master-planned sections, have architectural review boards that must approve exterior modifications before we even submit for a county permit. You’ll decide at this stage whether you want a full kitchen or a kitchenette, and whether the unit needs to be fully independent or can share utilities with the main house. That choice changes the electrical service and plumbing scope significantly.
Stage 2: Design and permit drawings (2-3 weeks)
Our drafting team produces plans for Palm Beach County Building Division submittal, including structural, electrical, plumbing, and energy compliance. For Royal Palm Beach’s pre-2002 CBS homes, we often need to address roof-deck attachment and wall-to-foundation connections if the garage shares a roofline with the house. You’ll choose your layout here: single open studio, one-bedroom with partition wall, or L-shaped configuration that preserves some storage. You’ll also select your window and door package, which for this area typically means impact-rated products that satisfy current Florida Building Code and insurance requirements.
Stage 3: Demolition and rough prep (1 week)
We strip the garage to block, address any slab settlement or moisture intrusion, and frame new interior walls. If your garage slab sits below the main house floor elevation, we’ll discuss whether to pour a raised subfloor or work with the existing level. You’ll make your final electrical and plumbing fixture selections now, before rough-in begins.
Stage 4: Rough-in trades and inspection (2-3 weeks)
Licensed electricians and plumbers run new service or tap existing lines, HVAC gets routed, and insulation goes in. Palm Beach County requires rough inspections before we close walls. In Royal Palm Beach’s wet season, from June through October, we’ve learned to sequence concrete or masonry work around the afternoon storms that can delay exterior pours. You’ll do a walkthrough with our project manager before drywall to confirm outlet locations and any recessed lighting layout.
Stage 5: Finish work and final inspection (3-4 weeks)
Drywall, flooring, cabinetry, countertops, fixtures, paint, and final electrical and plumbing trim. We coordinate the county final inspection and, if required, your HOA’s completion sign-off. You’ll do a punch list walkthrough with us. Most homeowners in Royal Palm Beach use this unit for family, rental income, or aging-in-place, so we pay particular attention to accessible thresholds and bathroom grab-bar blocking even if you don’t need it immediately.
The Options You’ll Choose Between for Your Garage Conversion ADU
- Full kitchen versus kitchenette: A full kitchen with range, full-size refrigerator, and dishwasher adds $8,000-$15,000 but makes the unit truly independent and maximizes rental value. A kitchenette with cooktop, under-counter fridge, and no dishwasher cuts that roughly in half. For Royal Palm Beach’s rental market, the full kitchen typically pays back within two to three years of occupancy.
- Impact-rated windows and doors versus standard: Current Florida Building Code requires impact resistance or shutters for new openings, but your existing garage door opening may trigger full compliance for the whole structure. Impact-rated products from manufacturers like PGT or CGI run 40-60% more than non-impact, but they eliminate shutter maintenance and satisfy Citizens Property Insurance inspections that are increasingly common in this village.
- Mini-split HVAC versus tied to main house: A dedicated mini-split gives the tenant full climate control and separate metering potential. Tapping the main house system costs less upfront but creates shared utility headaches and may overload an older unit. Most Royal Palm Beach homes from the 1980s and 1990s have original AC systems at end of life, so we often recommend the mini-split path.
- Slab-on-grade flooring versus raised subfloor: Working with the existing concrete slab saves $2,000-$4,000 but limits your flooring to materials that tolerate potential moisture wicking. Luxury vinyl plank or ceramic tile handle this well. A raised wood subfloor with insulation underneath adds cost but opens up engineered hardwood and creates a warmer feel underfoot.
- Prefab wet-wall modules versus site-built: For tighter garage footprints, a prefab bathroom or kitchen module from partners like Boxabl or Plant Prefab can compress schedule by 2-3 weeks. Site-built gives more layout flexibility and typically integrates better with existing Royal Palm Beach architecture. We quote both paths when the footprint makes sense.
What Garage Conversion ADU Costs in Royal Palm Beach, FL
Garage conversion ADU projects in Royal Palm Beach typically fall between $30,000 and $80,000. That’s a wide span because the variables are real and specific.
What pushes you toward the low end ($30,000-$45,000): Single-car garage under 250 square feet, existing slab in good condition, kitchenette rather than full kitchen, mini-split HVAC, no plumbing relocation needed, and your electrical panel has capacity for a subpanel. These jobs move fast and stay simple.
What pushes you toward the high end ($65,000-$80,000+): Two-car or oversized garage, slab leveling or moisture remediation required, full kitchen with gas range, bathroom with relocated drain lines, impact-rated window and door package, dedicated electrical service upgrade, and any structural modification to the roofline or garage door header. If your project is part of a full Home Additions & ADU in Royal Palm Beach scope that includes exterior hardscaping or roofing work, we coordinate that as a single build sequence.
Our written estimates itemize permit fees, rough and finish materials, labor by trade, and any subcontractor scopes. What typically isn’t included: utility connection fees from Florida Power & Light or your water utility, separate meter installation if you want one, and HOA application or architectural review fees. We flag these during feasibility so there are no surprises.
What Royal Palm Beach Homes Specifically Do to This Job
Royal Palm Beach was built out almost entirely between the mid-1970s and late 1990s as a master-planned suburban village, creating an unusually homogeneous cohort of aging CBS homes that are simultaneously hitting the threshold for major construction work. When we convert a garage to an ADU here, we’re almost always working with concrete block and stucco construction on slab-on-grade foundations that predate the 2002 Florida Building Code.
That matters practically. The original single-pane aluminum windows and aging flat or low-slope tile roofs we see on nearly every street from Sparrow Drive to Okeechobee Boulevard mean the garage conversion often isn’t the only project the homeowner needs. Insurance-driven hurricane mitigation retrofits have become routine, triggered by Citizens Property Insurance renewal inspections demanding compliance upgrades. We regularly coordinate garage conversion ADU work with roof-deck clip installation, truss wrapping, and impact-opening replacement so the homeowner passes inspection and secures coverage without a second contractor.
The village’s engineered canal-and-retention-pond drainage system also affects our work. Any ground disturbance, even slab cutting for plumbing trenches, must account for drainage easements and the wet-season saturation that compromises formwork from June through October. We schedule accordingly. And because Royal Palm Beach’s pervasive HOA covenants strictly govern exterior finishes, materials, and setbacks in ways that neighboring unincorporated Acreage properties are not, we submit architectural review packages before permit application to keep your project violation-free.
Our Royal Palm Beach crew knows the specific inspectors and the common hold points. That local fluency saves weeks.
Serving Royal Palm Beach, FL - Our Local Coverage Area
We’re based in the Royal Palm Beach 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 Royal Palm Beach
Most garage conversion ADU projects in Royal Palm Beach take 8-14 weeks from permit approval to final inspection. Permitting itself adds 3-6 weeks depending on Palm Beach County’s current queue and whether your HOA requires pre-approval. Call (844) 665-0162 and we can check current turnaround times.
Yes. Palm Beach County requires building, electrical, plumbing, and mechanical permits for any garage conversion ADU, plus compliance with Florida Building Code energy and impact requirements. Your HOA may also require architectural review. We handle all submittals as part of our standard process.
Sometimes, if your garage already has a sink or utility connections and your electrical panel has spare capacity. Most Royal Palm Beach homes from the 1970s-1990s need at least electrical upgrades and new plumbing for a kitchen and bath. We assess this during feasibility and give you an honest read on what’s required versus what’s optional.
A garage conversion ADU is almost always less expensive than new detached construction because you’re using existing walls, roof, and foundation. Detached ADU construction in this market runs $90,000-$220,000 versus $30,000-$80,000 for conversion. The trade-off is footprint: you’re limited to your garage’s existing dimensions.
We warranty our workmanship for one year, and the materials we install carry their own manufacturer warranties. Windows from Andersen or PGT, roofing materials from GAF or CertainTeed, and cabinetry from KraftMaid or Wellborn each have specific coverage terms that we document at project closeout. Our Home Additions & ADU team keeps copies on file for you.
Ready to Convert Your Garage in Royal Palm Beach?
Call (844) 665-0162 to schedule a free on-site estimate. We’ll walk your garage, check your HOA requirements, and give you a written scope and price with no pressure. If you’re also considering interior finishes, many homeowners pair this with Cabinets & Countertops in Royal Palm Beach or Backsplash, Tile & Flooring in Royal Palm Beach to complete the full unit through one build sequence.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Royal Palm Beach and South Florida homeowners since our founding.