What Does a Garage Conversion ADU Cost and Take in Lighthouse Point?
A garage conversion ADU in Lighthouse Point typically runs $30,000-$80,000 and takes 8-14 weeks from permit to final inspection, depending on whether your existing slab needs moisture remediation and how much of the electrical service requires upgrading. Most 1950s-70s era two-car garages in this city yield 400-550 square feet of finished living space once insulated, dried in, and tied into the main home’s systems. Call (844) 665-0162 and we’ll walk your specific garage and give you a written estimate with line-item pricing, usually within 48 hours of our first site visit.
How We Convert a Lighthouse Point Garage into an ADU
We’ve done enough of these in canal-front CBS homes to know where the surprises hide. Here’s the actual sequence we follow, and what you’ll need to decide at each point.
Stage 1: Site evaluation and scope lock (Week 1)
We measure your garage slab, test for moisture intrusion, and map the existing electrical panel capacity. Most Lighthouse Point garages sit on 1960s-era slabs with no vapor barrier, so we bring in a moisture meter and often recommend a topical moisture mitigation system before any framing begins. You’ll decide here whether the ADU needs a full kitchen or just a kitchenette, and whether we’re tying into existing sewer lines or installing a grinder pump for independent service. That choice alone can swing your timeline by two weeks and your budget by $8,000-$15,000.
Stage 2: Design, permitting, and seawall coordination (Weeks 2-5)
Our drawings go to Broward County with Lighthouse Point’s specific coastal setback verification. Because your property likely fronts a finger canal, the county frequently flags these permits for seawall condition review. If your 1960s concrete seawall shows spalling or weep failure, you’ll face a repair obligation before construction starts. We coordinate that inspection early so it doesn’t stall your project mid-stream. You approve final finishes and fixture selections during this window.
Stage 3: Demo, slab prep, and rough mechanical (Weeks 6-8)
We strip the garage door opening, infill with CBS block to match your home’s exterior, and cut in any new window or door locations. Plumbing rough-in for kitchen and bath happens here, along with electrical service upgrades. Many Lighthouse Point homes still run on 100-amp panels; an ADU with full appliances typically demands 200-amp service and a new meter base. The slab gets its moisture barrier and either self-leveling underlayment or a raised subfloor system depending on your flooring choice.
Stage 4: Framing, insulation, and dry-in (Weeks 9-11)
Interior walls go up, we install impact-rated windows and doors per Florida Building Code, and spray-foam or batt insulation goes in. Your HVAC decision matters here: a mini-split system is faster and avoids ductwork, but a tied-in central system gives cleaner aesthetics. We pressure-test all mechanicals before drywall.
Stage 5: Finish work and final inspection (Weeks 12-14)
Flooring, cabinetry, countertops, fixtures, and paint. We use Cabinets & Countertops in Lighthouse Point selections from KraftMaid or Wellborn depending on your budget tier, with Cambria or quartz surfaces for the kitchenette. Final Broward County inspection covers life safety, energy code, and coastal wind-load compliance. You get keys when the certificate of occupancy posts.
The Build Choices That Matter for Your Garage Conversion ADU
Every decision below affects how the space lives, how long it lasts in salt air, and what you’ll spend. We lay out the honest trade-offs so you’re not guessing.
- Slab moisture strategy: Epoxy sealant with vinyl plank flooring runs $3-$5 per square foot and handles moderate moisture. A full raised subfloor with pressure-treated sleepers and moisture barrier jumps to $8-$12 per square foot but breathes better and accommodates future plumbing access. For canal-front homes with chronically damp slabs, we almost always recommend the raised approach.
- Exterior infill material: Matching your existing CBS block gives seamless aesthetics and the best impact resistance, but it’s slower and costlier than framed wall with HardiePanel. James Hardie fiber-cement siding holds up well in salt air and installs faster, though you’ll see a texture difference where the old stucco meets the new panel unless we re-stucco the entire elevation.
- Kitchenette vs. full kitchen: A wet bar with mini-fridge and microwave drawer starts around $4,500 installed. A full kitchen with range, dishwasher, and standard cabinetry runs $12,000-$22,000 depending on brand tier. For rental ADUs, the full kitchen commands higher rent; for in-law suites, the kitchenette often suffices.
- HVAC approach: Ductless mini-split, $3,500-$6,500 installed, operates independently and avoids tying into an aging central system. Extending existing ductwork, $5,000-$9,000, only works if your current unit has capacity, which most 1960s-era systems don’t.
- Independent meter vs. sub-panel: A sub-panel fed from your main service is cheaper upfront ($2,500-$4,000) but complicates utility billing if you rent the unit. Independent meter and service, $6,000-$10,000, requires FPL coordination and adds 2-3 weeks but gives clean separation.
Homeowners often pair this work with Backsplash, Tile & Flooring in Lighthouse Point upgrades in the main house to keep material continuity across the property.
What Garage Conversion ADU Costs in Lighthouse Point, FL
In this market, expect $30,000-$80,000 for a complete garage-to-ADU conversion. The table below breaks typical line items.
| Component | Low Range | High Range |
|---|---|---|
| Basic conversion (kitchenette, bath, no slab work) | $30,000 | $45,000 |
| Full kitchen, upgraded finishes, moisture mitigation | $45,000 | $65,000 |
| Full kitchen, slab replacement, 200-amp service, impact windows | $65,000 | $80,000 |
Five variables push you toward the high end: (1) Garage size and condition - a 24×24 two-car with sound slab costs less than a 20×20 with spalling concrete and no vapor barrier. (2) Utility relocation distance - moving sewer and water lines 40 feet across a canal-front lot adds excavation and pump system costs. (3) Electrical service age - homes built before 1975 almost always need full panel and service upgrades. (4) Finish material grade - Wellborn cabinetry and quartz counters versus stock boxes and laminate. (5) Permit complexity - seawall-triggered inspections, HOA architectural review, or coastal setback variances add soft costs and timeline.
Our written estimates itemize each of these so you see where your money goes. What we don’t include: seawall repair if triggered by county inspection, HOA application fees, or temporary relocation if you choose to move out during construction.
Why Lighthouse Point Homes Make This Job Different
Lighthouse Point isn’t Pompano Beach with a different ZIP code. The city was dredged from coastal wetlands in the 1950s and 1960s, and nearly every residential lot sits on a finger canal with original concrete seawalls now at or past their 50-year design life. When we pull a construction permit for your garage conversion ADU, Broward County routinely triggers a mandatory seawall inspection. We’ve seen straightforward $40,000 conversions stall when that inspection reveals spalling, weeping, or undermining that demands $35,000 in seawall repair before the first block is laid.
The housing stock itself shapes our approach. These are CBS structures from the late 1950s through early 1980s, most with original electrical panels, single-pane windows, and roof decks that won’t meet current wind-load requirements. A garage conversion ADU here isn’t just finishing a box; it’s integrating with systems that often need simultaneous upgrading. The salt-laden air off the Atlantic corrodes rebar and metal fasteners inside that concrete and stucco, so we specify stainless or galvanized hardware anywhere we’re cutting into existing walls. And with 60-plus inches of annual rainfall and a water table essentially at slab level, moisture control isn’t optional. We’ve learned to test every garage slab in Lighthouse Point before we quote, because assuming dryness inland has cost other contractors change orders they didn’t plan for.
This is part of a full Home Additions & ADU in Lighthouse Point project scope when homeowners are expanding beyond the garage. Our Home Additions & ADU crew handles everything from site evaluation through certificate of occupancy, and we cover Lighthouse Point as a core service area alongside Pompano Beach Highlands and Deerfield Beach.
Serving Lighthouse Point, FL - Our Local Coverage Area
We’re based in the Lighthouse Point 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 Lighthouse Point
Most projects run 8-14 weeks from permit submission to final inspection, with 3-5 weeks of that typically spent in Broward County permitting and any required seawall review. Call (844) 665-0162 and we can give you a tighter timeline once we’ve seen your garage and pulled a preliminary permit history.
Yes, Broward County requires a building permit for any garage conversion ADU that adds plumbing, electrical, or habitable square footage, and Lighthouse Point’s canal-front location often triggers additional coastal setback and seawall inspections. We handle all permit drawings, submissions, and inspection scheduling as part of our standard process.
You can avoid relocating sewer and water lines if your garage shares a wall with existing kitchen or bath plumbing, but you’ll still need to extend electrical service since most original Lighthouse Point panels lack capacity for an additional dwelling unit. During our site evaluation, we map your existing utilities and show you exactly what stays and what moves.
A garage conversion ADU in Lighthouse Point typically costs 30-40% less than a detached unit because you’re working with an existing slab, walls, and roof structure rather than building from grade up. The savings disappear if your slab needs replacement or your seawall fails inspection, which is why we evaluate both conditions before quoting.
We warranty our workmanship for one year and pass through all manufacturer warranties on materials, from KraftMaid cabinet finishes to James Hardie siding and any impact-rated window products we install. Structural elements tied to our work carry the same coverage. We document all warranty registrations and give you the paperwork at final walkthrough.
Get a Written Estimate for Your Lighthouse Point Garage Conversion ADU
We’ll walk your garage, test the slab, check your panel capacity, and give you a line-item estimate with real numbers, not a ballpark. Most Lighthouse Point homeowners get their written quote within two business days of our site visit. Call (844) 665-0162 or reach out through our contact form to schedule. Raymond Estevez and our Home Additions & ADU team will handle every phase, from seawall coordination through final inspection, so you’re not juggling separate contractors for electrical, plumbing, and finish work.
Written by Raymond Estevez, Owner at Groundwork Construction Co., serving Lighthouse Point since our founding in Fort Lauderdale.