Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Lantana
Home additions and ADU construction in Lantana, FL typically run $45,000-$130,000 for room additions and $90,000-$220,000 for detached ADUs, with most projects requiring concurrent FEMA flood-elevation and Florida Building Code wind-load compliance due to the town’s position on the Intracoastal Waterway. We’re Rowan Construction Group, and our crews serve Lantana from our South Florida dispatch office with background-checked, uniformed technicians who arrive with a written price before any work starts. Call (561) 475-3903 to schedule your free estimate.
Lantana is barely three square miles, but that small footprint sits almost entirely within the salt-air corrosion envelope and FEMA special flood hazard zones. We’ve learned that additions near the Bayside neighborhood or along Ocean Avenue don’t move through permits on the same track as inland Palm Beach County jobs. The town’s municipal building department runs its own review, and any structural work within a few blocks of the water triggers a dual compliance process that catches out-of-town contractors off guard. That’s why our quotes for Lantana include both the wind-load documentation and the flood-elevation certificate review upfront, not as afterthoughts.
Why Rowan Construction Group West Palm Beach Is Lantana’s Preferred Home Additions & ADU Company
We’ve delivered more than 4,000 projects since 2007, every one with a written flat price before work began and a documented photo record when the crew left. In Lantana specifically, our reputation rests on getting permits right the first time through the town’s building department. Homeowners in the Bayside and Hypoluxo Island areas have left reviews noting that our crews showed up with the flood-elevation paperwork already initiated, not discovered mid-process.
Our response time to Lantana is same-day for initial consultations, with scheduling coordinated from our Miami office. We know the difference between a CBS home built in 1962 with original roof-to-wall strapping and one that was retrofitted after Hurricane Andrew. We know which lots on Lantana’s east side will automatically trigger that FEMA AE zone review. And we know that a homeowner on West Ocean Avenue who documents hot-dipped galvanized fasteners and wind-uplift clips during construction can use that same paperwork for a wind-mitigation insurance credit.
Under Clause 1 of The Haven Standard, the price is always written before anyone picks up a tool. Under our 365-Day Done Right Promise, if it’s not done right, we make it right, backed by terms you can read, not a handshake.
Our Home Additions & ADU Services in Lantana
ADU Design & Permitting
ADU design and permitting in Lantana starts with two questions: what’s your lot’s FEMA flood zone designation, and what’s the existing home’s wind-load documentation status? We handle both tracks simultaneously through Lantana’s municipal building department. A typical detached ADU permit set here includes the Florida Building Code structural drawings, a flood-elevation certificate application, and Palm Beach County wind-load calculations. We don’t submit until all three are complete. Our Home Additions & ADU team has worked with the town’s inspectors on enough projects to know the lead times and the common hold points.
Garage Conversion ADU
Garage conversions in Lantana run $30,000-$80,000 and face a specific local constraint: many garages in the 1950s-1970s CBS stock were built on slabs without the elevation or flood-venting required for habitable space. Converting one to an ADU means bringing the structure into FEMA compliance, not just adding a kitchen and bath. We assess the existing slab elevation relative to the base flood elevation, specify flood-resistant materials below the design flood elevation, and document every step for the certificate of occupancy. In the Hypoluxo Island area, we’ve seen garages where the slab was actually below grade, requiring a more extensive approach.
New Detached ADU
New detached ADUs in Lantana are where the dual compliance burden is most visible. The foundation must meet FEMA elevation requirements for the specific lot, while the structure must pass Palm Beach County wind-load standards for the High-Velocity Hurricane Zone-adjacent rating. We pulled a permit in the Lantana Bayside neighborhood for a detached ADU behind a 1960s CBS home with an aging low-slope roof, and the first thing the town required was a flood-elevation certificate because the lot sits in a FEMA AE zone near the Intracoastal. Our crew specified hot-dipped galvanized strapping and stainless fasteners on the roof-to-wall connections-standard builders inland would have used cheaper hardware-and we documented every wind-uplift clip with photos before the inspector signed off. The homeowner later used that same inspection sign-off and product documentation in a wind-mitigation insurance claim.
Junior ADU & Interior Conversion
Junior ADUs and interior conversions in Lantana’s older housing stock require careful assessment of the existing structure. Many homes in the town’s central neighborhoods have embedded rebar actively corroding from decades of salt-air exposure. Before we open walls for a junior ADU, we inspect the substrate condition, document any rebar corrosion we find, and specify repairs that won’t fail in three seasons. The written scope includes exactly what we’re cutting, what we’re reinforcing, and what fasteners we’re using where. No work proceeds on a change until the change order is signed.
What happens when you call
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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.
BeforeAfterTrusted Brands We Service in Lantana
Our sourcing depth across fifty-plus vetted brands means the written quote for your Lantana addition carries honest numbers, not inflated ones. For ADU and addition projects in this market, we regularly specify Mighty Buildings for panelized construction where speed and precision matter, Boxabl for compact, code-compliant modular units that ship complete, and Plant Prefab for custom designs that still arrive with engineering stamps intact. We also use Tuff Shed structures as the shell for certain garage conversion and detached studio projects, then finish the interior to residential code. Because we stock relationships with these suppliers, not just catalogs, lead times for Lantana jobs reflect real availability, not guesses.
Common Home Additions & ADU Problems We See in Lantana Homes
- Permit holds after slab pour. Out-of-town crews bid the addition without a flood-elevation certificate review, then face a stop-work order from Lantana’s municipal building department once the town’s reviewer sees the lot’s FEMA designation. The slab has to be evaluated for elevation compliance, and if it’s too low, the fix is expensive.
- Fastener corrosion within seasons. Standard zinc-plated fasteners and flashing are substituted for hot-dipped galvanized or stainless in the salt-air envelope, and the corrosion shows up on the punch list within a few seasons. We see this on additions where the contractor sourced hardware from a standard inland supplier without checking the coastal specification.
- Missing wind-load documentation. Wind-load compliance gets treated as a paperwork formality instead of being verified on the framing inspection, leaving the homeowner without documentation for an insurance premium credit. The clips are in the wall, but there’s no photo, no inspector sign-off, no proof.
- Aging rebar in CBS walls. The 1950s-1970s concrete block and stucco homes common in Lantana have rebar that’s been corroding in the salt-laden environment for decades. Opening these walls for an addition without assessing rebar condition risks structural compromise that a simple patch won’t fix.
Pricing for Home Additions & ADU in Lantana, FL
A typical home addition in Lantana runs $45,000-$130,000. ADU construction runs higher, at $90,000-$220,000, because of the separate utility connections and the more extensive compliance documentation. Garage conversions fall in between at $30,000-$80,000, though FEMA elevation issues can push the upper end.
| Project Type | Price Range in Lantana |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
What moves the number: flood zone designation and whether the lot needs fill or elevation adjustment; wind-load rating and whether impact-rated windows and doors are required; existing structure condition, especially rebar and roof-to-wall strapping; utility extension distance for detached units; and finish level, from basic rental-grade to owner-occupied quality. Every quote we deliver is a flat written price with a written scope and a written warranty. No change proceeds without a signed change order. Call (561) 475-3903 for your free estimate.
We Also Serve Cities Near Lantana
Our crews work throughout Palm Beach County, including Home Additions & ADU in Lantana and the surrounding communities of West Palm Beach, Westgate, Riviera Beach, and Lake Park. Each city has its own permit environment and flood zone profile, and we adjust our compliance approach accordingly.
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
Probably yes. Lantana’s municipal building department requires flood-elevation documentation for most structural additions because the town’s small footprint means a high percentage of lots fall within FEMA special flood hazard zones. We check your specific lot’s designation during our initial site visit and include the certificate process in the written scope if required. Call (561) 475-3903 and we’ll verify it before you commit.
Additions in Lantana must comply with Palm Beach County wind-load standards under the Florida Building Code, which for this area means design for High-Velocity Hurricane Zone-adjacent conditions, typically requiring roof-to-wall connections rated for uplift pressures that standard inland construction does not face. Our quotes specify the exact clip and strapping schedule, not a generic “to code” note. Call (561) 475-3903 for a written scope that names the hardware.
Salt air from the Intracoastal accelerates corrosion of standard zinc-plated fasteners and flashing faster here than even a few miles inland. We specify hot-dipped galvanized or stainless hardware on every Lantana addition as standard practice, not an upgrade. The specification is written into the quote, and we photograph every connection for the documented photo record you receive. Call (561) 475-3903 to review the material list.
Documented wind-load compliance, verified by inspection sign-off and product documentation, can qualify you for wind-mitigation credits on your homeowner’s insurance premium in Florida. We provide the photos, the inspector approvals, and the product spec sheets as standard deliverables, not extras. One of our Bayside clients used our documentation to file a successful wind-mitigation claim after their detached ADU was completed. Call (561) 475-3903 to discuss how we’d document your project.
A compliant quote names the flood-elevation certificate process, specifies the exact wind-load hardware by type and coating, includes a written change-order policy, and provides a documented photo record as standard. Cheap quotes often omit the certificate review, use “to code” instead of naming hardware, and treat documentation as optional. Under The Haven Standard, Clause 1 requires the written price before work starts, and our quotes include all of the above. Call (561) 475-3903 for a line-by-line review of any competitor’s estimate, free.
Ready to add space to your Lantana home? Call (561) 475-3903 to schedule your free estimate. We’ll bring a written price, a clear scope, and a plan for getting your permits through Lantana’s building department without the surprises.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Lantana since 2007.