Fast, Reliable Home Additions & ADU Across Lantana
Home additions and ADU construction in Lantana typically run $45,000-$130,000 for room additions and $90,000-$220,000 for detached ADUs, with garage conversions landing in the $30,000-$80,000 range. Most projects require 8-16 weeks from permit to final inspection, though flood-zone compliance can extend timelines for homes near the Intracoastal. Call (844) 665-0162 for a free estimate and timeline specific to your property.
We’re Groundwork Construction Co. of South Florida, and we know Lantana’s housing stock intimately. From the 1950s CBS homes along Ocean Avenue to the mid-century duplexes tucked behind the Intracoastal in South Palm Park, we’ve worked on the flat roofs, the original jalousie windows, and the undersized electrical panels that define this town. Our Home Additions & ADU team is based in Fort Lauderdale, which means we’re on your job site in Lantana within 30-45 minutes when issues arise. That proximity matters when a county inspector flags a flood-elevation detail or a delivery of impact-rated windows needs sign-off.
Why Groundwork Construction Co. of South Florida Is Lantana’s Preferred Home Additions & ADU Company
We’ve built our reputation in Lantana by respecting what makes this town different. The 33462 ZIP isn’t like inland Palm Beach County. You’re dealing with salt air, aging CBS construction, and FEMA flood zones that can turn a straightforward garage conversion into a compliance project overnight. Homeowners here don’t need a contractor who learns those rules on the fly.
Our crews have completed ADU and addition projects throughout Lantana, from garage conversions near the municipal beach to second-story additions on homes along Hypoluxo Road. Raymond Estevez, who leads our company, personally reviews flood-map and assessed-value checks before any contract is signed. That step alone has saved Lantana clients from mid-project surprises that would have added $15,000-$40,000 in unplanned elevation work.
Response time to Lantana averages under 45 minutes for site visits and consultations. We’re close enough to walk properties quickly, pull permits at the Palm Beach County office, and coordinate inspections without the delays that plague contractors based in West Palm or Boca. For a town where flood compliance and wind-code adherence are non-negotiable, that local operational speed protects your timeline and your budget.
Our Home Additions & ADU Services in Lantana
ADU Design & Permitting
Every Lantana ADU starts with two documents: the FEMA flood map and the Palm Beach County Property Appraiser’s latest assessed value. We don’t begin design until we’ve confirmed whether your project will trigger the 50% substantial-improvement threshold. For homes in AE zones, which covers much of Lantana east of Dixie Highway, this single check determines whether your addition can proceed at grade or must elevate to Base Flood Elevation. Our permitting team handles the county submittals, the flood-plain documentation, and the wind-load calculations that Palm Beach County requires post-Andrew. We’ve learned which plans examiners ask for what, and we front-load those details to avoid revision cycles.
Garage Conversion ADU
Garage conversions are the most common ADU type we build in Lantana, and they’re also the most likely to trigger flood compliance. On a 1962 CBS home on a quiet street in the South Palm Park neighborhood, our crew tore off an old one-piece garage door and converted the attached garage into a studio ADU. We specified hot-dipped galvanized hurricane straps and stainless fasteners throughout, and because the project crossed the county’s 50% substantial improvement threshold, we coordinated with Palm Beach County to elevate the new slab to Base Flood Elevation before framing. That project is now a permitted, income-generating studio. We bring that exact experience to every garage conversion we price in Lantana.
New Detached ADU
Detached ADUs in Lantana face a unique constraint: virtually no undeveloped land exists in this built-out town. Most projects require reconfiguring existing yard space or replacing aging outbuildings. We offer two build paths. Traditional stick-framed construction with CBS block and stucco to match Lantana’s architectural fabric, or prefab ADU units from Abodu, Dvele, Mighty Buildings, or Boxabl for faster site completion. Prefab can compress the build schedule by 6-10 weeks, but flood-zone requirements apply regardless of construction method. We’ll walk your lot, confirm setbacks against Palm Beach County’s code, and recommend the path that fits your property and your compliance situation.
Junior ADU & Interior Conversion
Junior ADUs, created within the existing footprint of a single-family home, often avoid the flood-elevation triggers that snag garage conversions. In Lantana’s 1950s-1970s CBS homes, we frequently convert underutilized spaces: formal living rooms that never get used, oversized utility rooms, or sections of sprawling single-story floor plans. The key constraint is the existing electrical service. Many Lantana homes still run on 100-amp panels with fuse boxes or early breaker panels that can’t handle an additional dwelling unit’s load. We assess this during our first site visit and price panel upgrades into the project if needed, so you’re not calling an electrician mid-project.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Lantana
Groundwork works with 50+ recognized industry brands across every category we touch, and we bring that full roster to Lantana projects. For cabinetry in ADU kitchens, that means KraftMaid and Wellborn options across multiple price tiers. For countertops, we specify Cambria, Silestone, or Caesarstone depending on your maintenance preferences and budget. Exterior cladding on additions draws from James Hardie fiber-cement products, specified specifically for salt-air durability in Lantana’s coastal environment. We don’t lock you into proprietary materials or single-vendor relationships. You choose the brand, we handle the build. Our local supplier relationships mean Lantana clients aren’t waiting weeks for specialty orders that should be standard.
Common Home Additions & ADU Problems We See in Lantana Homes
- Surprise flood-elevation requirements. Starting an addition or ADU without pulling the FEMA flood map and the county property appraiser’s assessed value, only to hit a surprise flood-elevation requirement mid-project. We’ve seen contracts fall apart when this surfaces after permits are pulled. We check it before you sign.
- Fastener corrosion from salt air. Using non-stainless or non-hot-dipped fasteners and anchor bolts on exposed exterior work, which rapidly corrode in Lantana’s salt air and compromise the structure. Every exterior connection on our Lantana jobs gets specified for marine exposure.
- Inadequate existing foundations. Assuming an old CBS slab is adequate for a new ADU or second-story addition without verifying the existing footings and possible need for underpinning, especially near the water. Lantana’s coastal soils and age of construction make this verification essential.
- Non-impact-rated openings. Designing an ADU or addition with standard windows and doors without impact-rated glazing, failing Palm Beach County’s post-Andrew wind code and forcing a costly retrofit. We specify Andersen, Pella, Marvin, Milgard, Jeld-Wen, Simonton, PGT, or CGI products with appropriate ratings from the start.
Pricing for Home Additions & ADU in Lantana, FL
Below are the price ranges we see for Lantana’s market, calibrated for Palm Beach County permit costs, flood-zone compliance work, and impact-rated material requirements that contractors must price in from the first estimate.
| Project Type | Typical Range in Lantana |
|---|---|
| Garage Conversion ADU | $30,000-$80,000 |
| Home Addition (Room or Second Story) | $45,000-$130,000 |
| Detached ADU Construction | $90,000-$220,000 |
What moves you within these ranges? Flood-zone elevation work can add $15,000-$40,000 if triggered. Electrical panel upgrades run $2,500-$6,000 on Lantana’s older homes. Impact-rated windows and doors cost 30-50% more than standard units but are legally required. Foundation underpinning, when needed near the water, can add $8,000-$20,000. We itemize these possibilities in our estimates so you’re choosing with full information, not discovering costs later. Every estimate we provide in Lantana is free and carries no obligation. Call (844) 665-0162 to schedule yours.
We Also Serve Cities Near Lantana
Our Home Additions & ADU in Lantana work extends to neighboring communities with similar housing stock and compliance environments. We regularly build in Lake Worth, Lake Worth Corridor, Greenacres, and Greenacres City, where the same post-WWII CBS construction, salt-air exposure, and Palm Beach County wind codes apply. If you’re just outside Lantana’s 33462 ZIP, we likely already know your flood zone and your neighborhood’s typical permit path.
Serving Lantana, FL - Our Local Coverage Area
We’re based in the Lantana area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - Home Additions & ADU in Lantana
If your home is in an AE zone and the garage conversion pushes total renovation costs past 50% of your structure’s assessed value, Palm Beach County legally requires full flood-elevation compliance, meaning the new slab must meet Base Flood Elevation. We pull your flood map and assessed value before any contract is signed, so this requirement is known and priced from day one. Call (844) 665-0162 and we’ll check both documents for free.
Stainless steel or hot-dipped galvanized fasteners and anchor bolts are non-negotiable on every exterior connection in Lantana. Standard zinc-coated hardware corrodes within 2-4 years in this salt-laden environment, compromising hurricane straps and structural connections. We specify marine-grade hardware on every Lantana addition and ADU we build. Call (844) 665-0162 to review material specs for your project.
Probably not without an upgrade. Most Lantana homes from the 1950s-1970s still have 100-amp panels, some with fuse boxes, that lack the capacity for an additional dwelling unit’s independent circuits. We verify panel capacity during our first site visit and price upgrades into the project scope when needed. Call (844) 665-0162 for a load assessment.
Yes, but flood-zone compliance is more likely to apply. Proximity to the Intracoastal correlates strongly with AE zone designation in Lantana, and garage conversions on these properties frequently cross the 50% substantial-improvement threshold. We’ve completed multiple garage-to-ADU conversions in South Palm Park and near Ocean Avenue that required slab elevation. The project is absolutely feasible; it just demands front-loaded compliance work. Call (844) 665-0162 and we’ll confirm your specific requirements.
A detached ADU in Lantana typically runs $90,000-$220,000, with most projects clustering between $110,000 and $165,000 depending on size, finish level, and flood-zone requirements. Prefab options from Abodu, Dvele, Mighty Buildings, or Boxabl can reduce construction duration and sometimes total cost, but site prep, foundation, and utility connections remain significant line items in this market. Call (844) 665-0162 for a detailed estimate based on your lot and zoning.
Ready to expand your Lantana home? Whether you’re converting a garage, adding a second story, or building a detached ADU from the ground up, we’ll handle the compliance checks, the material selection, and the construction with one point of accountability. Call (844) 665-0162 for your free estimate. We’ll pull your flood map, verify your assessed value, and give you a scope and price that won’t shift mid-project.
Written by Raymond Estevez, Owner at Groundwork Construction Co. of South Florida, serving Lantana and Palm Beach County.