Fast, Reliable New Detached ADU Across West Palm Beach
A new detached ADU in West Palm Beach typically runs $185,000-$340,000 all-in, drawings through final inspection, depending on whether you go modular, prefab, or fully custom. The permit set is the product here: wind-load calculations, flood-elevation details, product approvals, and a written scope locked before any work starts. If you’re weighing a detached unit on a 50×100 lot in Prospect Park or a backyard build in Northwood, call (971) 497-2402 and we’ll walk you through what your specific property requires.
We coordinate scheduling and dispatch from our Miami (South FL) office, and our crews serve West Palm Beach locally. That means the people who show up know Palm Beach County’s product-approval process, the Historic Preservation Board’s review standards, and what the building department flags on first submittal. You don’t get a project manager three counties away learning your city’s code on your dime.
Why Ellery ADU Studio Is West Palm Beach’s Preferred New Detached ADU Company
Ellery ADU Studio has designed, permitted, and built 900+ ADUs since 2015, every one with a written price before work started and a documented photo record when work was complete. That matters in West Palm Beach specifically, because this city’s ADU work carries paperwork most other Florida markets don’t: High-Velocity Hurricane Zone engineering, FEMA flood elevations, and Certificates of Appropriateness in historic districts. A studio that treats the permit set as the core product, not an afterthought, is the difference between a unit that gets a certificate of occupancy and one that stalls at the building department.
Homeowners in West Palm Beach call us after their first estimate fell apart. Sometimes a contractor quoted a slab-on-grade foundation in an AE flood zone. Sometimes a prefab shell arrived with an out-of-state NOA that Palm Beach County wouldn’t accept. The reviews we earn from El Cid, Flamingo Park, and Northwood customers consistently mention one thing: our written quote included line items their other bids quietly skipped. Under Haven Standard Clause 1, every project gets a written price before any work begins. Under Clause 5, the scope is locked at signing. No door-side upsells.
Nadia Ellery founded the studio in 2015, the year California’s ADU permitting landscape shifted and a national conversation about detached units began. She runs the practice with a simple rule: the drawings, the permit set, and the construction are a single contract at a single written price. The designer can’t blame the builder. The builder can’t blame the designer. That one-contract model is why West Palm Beach homeowners hire us for New Detached ADU work instead of juggling separate firms.
Our New Detached ADU Services in West Palm Beach
We build, permit, and document every detached ADU type this market demands. Four categories cover most of what we do in West Palm Beach.
Custom Built ADU
A custom detached ADU in West Palm Beach runs $220,000-$340,000 for a 1-bed or 2-bed unit with impact-rated openings, engineered wind-load package, and flood-compliant foundation. This is the right path when you want the ADU to match a 1920s Mediterranean Revival home in El Cid or a mid-century CBS ranch in the central corridor. We handle the Certificate of Appropriateness drawings for historic districts, including elevation studies the Historic Preservation Board requires before permits are issued.
Prefab ADU Installation
Prefab units from Cover, Dvele, and Boxabl in West Palm Beach typically run $185,000-$250,000 including site prep, foundation, delivery, crane placement, and utility connections. The critical piece is Palm Beach County product approval: every prefab system we specify carries a Florida NOA that the building department here actually recognizes. We coordinate the factory, the foundation, and the final tie-downs under one contract, so the unit doesn’t sit in your driveway for four months waiting on paperwork.
Modular ADU
A modular ADU in West Palm Beach runs $195,000-$275,000 depending on module count, finishes, and whether the site needs a stem-wall or pile foundation. Modular works well on the tight 50×100 lots common in Flamingo Park and Northwood, where crane access from the street is straightforward but setback compliance is the first obstacle. We handle the site survey, the foundation engineering, the module set, and the finish work as one written scope.
Studio ADU
A detached studio ADU in West Palm Beach runs $165,000-$220,000. These are the most popular units for the Palm Beach-adjacent workforce housing market: a compact one-room unit with a kitchenette and bath that rents to the domestic staff, groundskeepers, and service workers who work across the bridge but can’t afford West Palm Beach rents. A studio still needs the full 170-mph wind-load package, so don’t let the small footprint fool you: the engineering doesn’t shrink with the square footage.
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.
Trusted Brands We Service in West Palm Beach
We specify and coordinate prefab and modular systems from Cover, Dvele, and Mighty Buildings, among others. Our familiarity with these manufacturers means we know which models carry Palm Beach County product approvals, which floor plans fit a 50-foot-wide lot, and which structural specs already meet HVHZ wind-load requirements without costly re-engineering. For West Palm Beach customers, that shortens the design phase and keeps the written quote accurate. We don’t sell you a shell and walk away; we deliver the full permit set, the site coordination, and the final inspection under one contract.
Common New Detached ADU Problems We See in West Palm Beach Homes
- Out-of-state prefab shells with rejected product approvals. A homeowner buys a “hurricane-rated” unit online, but Palm Beach County won’t accept the out-of-state NOA. The unit sits in the driveway for months while the owner scrambles for a Florida engineer to re-evaluate it. We pull product approvals before quoting, so this never happens in the first place.
- Slab-on-grade foundations in FEMA AE flood zones. Much of West Palm Beach sits in Special Flood Hazard Areas near the Intracoastal and the flat South Florida water table. A contractor pours a standard slab, and the finished ADU ends up a foot below minimum base flood elevation. No certificate of occupancy. Our quotes include the stem-wall or pile foundation from day one, and the elevation certificate at the end.
- Historic district stop-work orders. A garage conversion in Flamingo Park or El Cid starts with new impact windows and a metal roof, but no Certificate of Appropriateness application. The Historic Preservation Board issues a stop-work order, and the roofline has to be redrawn. Our permit set includes the Historic Preservation Board submittal when the property requires it.
- Missing wind-load documentation on the final permit set. The building department asks for roof-to-wall strapping details, impact-rated opening schedules, and a continuous load path from foundation to ridge. Cheap quotes skip the engineering and hope for leniency. The department here doesn’t do leniency. Our permit set includes the full HVHZ package, down to the Simpson Strong-Tie H2.5A hurricane ties and H1Z straps.
Pricing for New Detached ADU in West Palm Beach, FL
We Also Serve Cities Near West Palm Beach
Our crews handle New Detached ADU in West Palm Beach and the surrounding municipalities, including Palm Beach Gardens, Wellington, Lake Worth, and Boynton Beach. Each city carries its own flood-zone mapping and wind-load requirements, so we confirm the product approvals and foundation specs for the specific address before quoting. You get one written price for the entire job, wherever the property sits.
Serving West Palm Beach, FL - Our Local Coverage Area
We’re based in the West 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.
FAQs - New Detached ADU in West Palm Beach
Yes. Every new detached ADU in West Palm Beach, regardless of size, sits in Florida’s High-Velocity Hurricane Zone and must meet 170-mph wind design with impact-rated openings. A studio ADU doesn’t get a code exemption for being small. Call (971) 497-2402 and we’ll show you the product-level documentation our permit set includes for every window and door.
Much of El Cid and Northwood sits in FEMA Special Flood Hazard Areas, which typically means the finished floor of a new detached ADU must sit at or above base flood elevation. That usually requires a stem-wall or pile foundation rather than slab-on-grade. Our written quote includes the foundation type your specific property requires, plus the elevation certificate at the end.
Plan on 6-12 weeks for Historic Preservation Board review in Flamingo Park, assuming the initial submittal is complete. The board reviews roofline, fenestration, and exterior materials for compatibility with Mediterranean Revival character. If the elevation drawings are incomplete, the review resets. Our permit set includes the elevation studies and compatibility documentation up front, so the first submittal is the complete submittal.
Often yes, though the exact reduction depends on your carrier and policy. A documented 170-mph wind-load package with impact-rated openings gives your insurer evidence the structure meets current code. We provide a certificate of compliance and a documented photo record on every project, which you can file with Citizens or your private carrier. We don’t promise a specific premium reduction; we give you the paperwork that supports your claim.
Yes, but only if the system’s exterior design passes Certificate of Appropriateness review, and that’s not guaranteed. The Historic Preservation Board in Flamingo Park, El Cid, and Northwood reviews roofline, materials, and fenestration for compatibility with the district’s character. Some prefab models pass easily. Some don’t. We’ll tell you before you buy which systems your property can actually get permitted, so you don’t end up with a unit that can’t be installed where you live.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving West Palm Beach since 2015.