Garage Conversion ADU in Palm Beach: What’s Involved, What It Costs, and How Long It Takes
A garage conversion ADU in Palm Beach transforms an existing attached or detached garage into a permitted dwelling unit with its own Kitchen Design & Layout - Palm Beach kitchenette, bath, sleeping area, and separate entrance. Most projects we handle in the 33480 ZIP code run $30,000-$80,000 and take 10-16 weeks from ARCOM submittal to final inspection, assuming the garage structure is sound and no major utility relocation is needed. Call (844) 665-0162 for a free on-site estimate and timeline specific to your property.
How We Approach a Garage Conversion ADU in Palm Beach
Every garage conversion ADU follows a five-stage sequence. The timeline shifts based on whether your property carries landmark designation and how quickly ARCOM reviews your materials, but the order never changes.
Stage 1: Feasibility and measured survey (Week 1)
We walk the garage with you, verify the slab condition, ceiling height, and existing electrical service capacity, and photograph every exterior elevation that ARCOM will scrutinize. You’ll decide at this stage whether you want a full kitchen or a kitchenette, whether the unit needs to be fully independent or can share utilities with the main house, and whether you’re open to a compact wet bath or need a full shower. We produce a measured as-built drawing and a preliminary floor plan.
Stage 2: ARCOM and building department pre-application (Weeks 2-4)
In Palm Beach, this is where out-of-town contractors stumble. We prepare fully rendered elevation drawings, material samples, and a design narrative for the Town’s Architectural Commission. ARCOM meets monthly; miss the submittal deadline and the project waits another month. We handle the scheduling, the presentation, and any requested revisions. You decide at this stage whether to match existing cast-stone detailing, clay barrel-tile rooflines, or pecky-cypress soffit materials, or to propose a contrasting but complementary treatment that ARCOM will still approve.
Stage 3: Structural and MEP rough-in (Weeks 5-9)
Once permits issue, we strip the garage interior, reinforce or replace the slab if it lacks a proper vapor barrier or has settled, and frame new interior partitions. Plumbing gets roughed in for kitchenette and bath; electrical service gets upgraded if the existing panel can’t handle the additional load; mini-split HVAC gets mounted. You’ll make your final selections on fixtures, cabinetry, flooring, and door hardware during weeks 5-6 so we can order with lead times in mind.
Stage 4: Insulation, impact-rated openings, and finishes (Weeks 10-13)
We install insulation to Florida Energy Code standards, then hang and finish drywall. The critical piece here is the impact-rated door and any required impact-rated windows, both mandatory under post-2002 Florida Building Code for this coastal exposure zone. Salt air from the Atlantic and Intracoastal accelerates corrosion on standard aluminum framing, so we spec only marine-grade fasteners and properly coated steel lintels. You’ll do a pre-finish walkthrough to confirm paint colors, tile layout, and trim profiles.
Stage 5: Final inspection and certificate of occupancy (Weeks 14-16)
Town of Palm Beach building inspectors verify structural, electrical, plumbing, and energy compliance. We correct any punch-list items, then hand over keys, manuals, and warranty documentation. The certificate of occupancy is what makes the unit legal for rental or family use.
The Choices You’ll Make for Your Garage Conversion ADU
No two garage conversion ADU projects in Palm Beach use the same spec package. Here are the real decisions that move your budget and your daily experience:
- Kitchenette vs. full kitchen: A kitchenette with a two-burner induction cooktop, compact refrigerator, and single-bowl sink runs $4,000-$8,000 installed. A full kitchen with standard appliances, custom cabinetry, and stone countertops pushes $12,000-$22,000. For rental ADUs, the kitchenette is usually sufficient; for aging-parent occupancy, the full kitchen wins.
- Wet bath vs. full bath: A wet bath, where the shower shares the entire floor space with toilet and sink, fits in 25 square feet and costs $5,000-$9,000. A full bath with a separate shower enclosure needs 40+ square feet and runs $9,000-$16,000. In a typical 400-square-foot garage conversion, every square foot matters.
- Utility sharing vs. independent meters: Tapping into the main house’s electrical panel and water service saves $3,000-$6,000 but complicates rental accounting. Separate meters add upfront cost and require utility coordination, yet they make the unit fully self-contained.
- Impact-rated door selection: Standard impact-rated fiberglass doors start around $1,200 installed. Architectural-grade aluminum or clad-wood impact doors from manufacturers like Pella or Andersen run $3,500-$6,500. ARCOM often has opinions about proportion and material that narrow your options.
- Flooring over existing slab: Luxury vinyl plank handles salt-air humidity well and installs directly over sealed concrete at $6-$12 per square foot. Porcelain tile is bulletproof but colder underfoot and runs $10-$18 per square foot installed. Engineered hardwood is risky this close to the water; we rarely recommend it for ground-level ADUs in Palm Beach.
What Garage Conversion ADU Costs in Palm Beach, FL
Home Additions & ADU in Palm Beach projects like garage conversions typically fall between $30,000 and $80,000. That’s a wide span because five variables push jobs to the low or high end:
| Cost Driver | Low-End Scenario | High-End Scenario |
|---|---|---|
| Garage size and condition | 400 sq ft, sound slab, no settlement | 600+ sq ft, slab replacement needed |
| Utility complexity | Shared electrical/water, no sewer pump | New service panel, grinder pump, gas line |
| Kitchen and bath spec | Kitchenette, wet bath, stock fixtures | Full kitchen, full bath, Kohler or Moen fixtures |
| ARCOM and landmark compliance | No landmark designation, simple match | Landmark review, custom cast-stone, specialist subs |
| Impact-rated openings and HVAC | Single door, one window, mini-split | Multiple openings, high-SEER system, dehumidification |
What’s included in our written estimate: all labor, rough and finish materials, permit fees, ARCOM application support, and project management. What’s typically not included: utility connection fees charged directly by Florida Power & Light or the Town, separate meter installation, landscape restoration beyond the immediate work area, and any required tree protection or dewatering if your garage sits below the water table. We flag these exclusions upfront so you’re not surprised.
Call (844) 665-0162 for an exact quote on your garage - estimates are free and include a preliminary ARCOM compliance review.
What Palm Beach Specifically Means for This Job
The Town of Palm Beach is not Palm Beach County, and contractors who treat them interchangeably lose months. ARCOM, the town’s own Architectural Commission, must approve virtually all exterior construction before you ever reach the building department. Their monthly meeting schedule is fixed and unforgiving. Miss the submittal deadline by a day, and your garage conversion ADU waits another month. We build this reality into every timeline we quote.
The housing stock here compounds the challenge. Most garages we convert sit beneath 1920s-1940s Mediterranean Revival or Spanish Colonial Revival estates, original Addison Mizner designs or faithful later examples, with poured concrete slabs, CBS walls, and ornamental cast-stone or terra-cotta elements. When we cut a new opening for an ADU entrance or add windows for light and ventilation, we’re matching materials that require specialist subcontractors. Landmark designation, common on the island’s older properties, triggers ARCOM design standards governing massing, fenestration, and color that go well beyond standard code.
Salt air is the invisible variable. Every structure in Palm Beach is bathed in corrosive air from the Atlantic to the east and the Intracoastal Waterway to the west. Standard steel lintels over new door openings rust through in half the time they’d last in West Palm Beach or Riviera Beach, so many homeowners also consider an Iron Fence in Palm Beach for perimeter durability. We spec marine-grade fasteners, coated structural steel, and aluminum or vinyl window frames rated for coastal exposure. Post-2002 Florida Building Code wind-speed requirements demand impact-rated windows and doors; the Town’s building department enforces this rigorously, and we wouldn’t spec below it regardless.
Homeowners often pair a garage conversion ADU with interior upgrades to the main house. If you’re already opening walls and relocating utilities, it makes sense to coordinate. Many clients add Cabinets & Countertops in Palm Beach for the main kitchen refresh, or Backsplash, Tile & Flooring in Palm Beach to unify the property’s material palette. Our crew handles both under the same project management, so you’re not juggling separate contractors across your estate.
Serving Palm Beach, FL - Our Local Coverage Area
We’re based in the 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 Palm Beach
Most projects take 10-16 weeks from ARCOM submittal to certificate of occupancy. Landmark-designated properties or complex utility relocations can extend this to 20-24 weeks. Call (844) 665-0162 and we’ll give you a timeline based on your specific garage and ARCOM status.
Yes, and in Palm Beach you need two layers of approval: ARCOM design review for the exterior changes, then Town building permits for structural, electrical, plumbing, and energy compliance. We handle both layers as part of our standard project management.
Sometimes, if your garage already has adequate electrical service and you’re willing to install a kitchenette with a macerating toilet rather than a gravity sewer connection. Most Palm Beach garages built in the 1920s-1940s lack sufficient amperage and require a panel upgrade. We’ll know after the Week 1 feasibility survey.
A garage conversion ADU in Palm Beach is almost always cheaper because you’re working within an existing foundation and roof structure. Detached Home Additions & ADU services here run $90,000-$220,000, while garage conversions start at $30,000. The trade-off is size and privacy; a detached unit can be larger and fully separate.
We warranty our workmanship for one year from certificate of occupancy. Manufacturer warranties on fixtures, appliances, impact-rated doors, and HVAC equipment run longer, typically 5-10 years depending on the brand. We register all warranties in your name and deliver the documentation at handover.
Ready to Convert Your Palm Beach Garage?
Call (844) 665-0162 for a free on-site estimate. We’ll walk your garage, review your ARCOM requirements, and deliver a written proposal with a real timeline and line-item pricing. No deposit required to schedule the feasibility visit.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Palm Beach and South Florida.