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 Palm Beach
A home addition or ADU in Palm Beach typically runs $45,000-$130,000 for room additions and $90,000-$220,000 for detached ADUs, with ARCOM approval timelines adding 2-6 months before construction can begin. We’re Rowan Construction Group, and our crews work across the island’s landmarked estates and post-war neighborhoods with the documentation discipline that keeps projects within a few percent of the written price. Dispatch and scheduling are coordinated from our Miami office, and we’ve built a local network of ARCOM-experienced subcontractors who understand what “period-appropriate” actually means in this market. Call (561) 475-3903 to schedule your free estimate.
Why Rowan Construction Group West Palm Beach Is Palm Beach’s Preferred Home Additions & ADU Company
We’ve delivered over 4,000 projects since 2007, every one with a written price before work started and a documented photo record when the crew left. In Palm Beach, that discipline matters more than most places. The Town’s Architectural Commission (ARCOM) reviews virtually every exterior alteration, and contractors who treat this like standard permitting learn fast that “fast-track” doesn’t exist here.
Our Palm Beach customers find us through the same research process we respect - they read the three-star reviews, they check whether the license number is printed on the page, and they want the price range in dollars before they’ll make contact. We put it on the page. Our 365-Day Done Right Promise is backed by The Haven Standard, not a handshake, and our Free Second Opinion on any written estimate means you can bring a competitor’s quote and we’ll review it line by line at no charge.
Crews are background-checked and uniformed. A live person answers calls 24/7. And every visit includes a documented photo record as standard - not an upgrade you pay extra for.
Our Home Additions & ADU Services in Palm Beach
ADU Design & Permitting
ADU construction in Palm Beach starts at $90,000 and runs to $220,000, but the first cost many contractors miss is the approval calendar. On the island’s roughly 1,500-plus landmarked properties, ARCOM’s Certificate of Appropriateness process runs parallel to standard permitting, and matching Addison Mizner-era materials - coral stone, Pecky cypress, hand-applied stucco - requires specialty sourcing that we build into the initial quote. Our Home Additions & ADU team coordinates with ARCOM-experienced architects who’ve shepherded projects through the Via Mizner corridor and the Estate Section. We don’t start construction until both approvals are in hand and every material is spec’d and priced in writing.
Garage Conversion ADU
Garage conversions in Palm Beach run $30,000-$80,000, but the island’s housing stock complicates what looks simple. Many 1920s-1950s Mediterranean Revival garages share walls with the main house, built from hollow clay tile or coral stone that can’t be treated like standard concrete block. Salt-air spalling on rebar inside pre-1970s concrete is endemic here, and opening a shared wall often reveals structural repair needs that a drive-by estimate won’t catch. We inspect first, write allowances into the contract, and document everything before the first stud gets touched.
New Detached ADU
A new detached ADU on a Palm Beach lot faces FEMA flood-zone requirements that mainland contractors sometimes overlook. The island’s many AE and VE zones require elevated finished floors, reinforced tie-down systems, and impact-rated windows under Miami-Dade/Palm Beach County wind codes. We pull permits knowing the inspection sequence, and we don’t pour foundation until the elevation certificate and ARCOM exterior approval both clear. The materials list gets locked before we start - no “we’ll figure it out in the field” that turns into a surprise change order.
Junior ADU & Interior Conversion
Junior ADUs and interior conversions in Palm Beach’s older homes often trigger the most unexpected costs. On a 1930s Mediterranean Revival house near Via Mizner, our crew opened an interior wall for a second-story addition and found hollow clay tile in place of the framing the original drawings showed, plus rebar already spalling from salt-air ‘concrete cancer.’ We stopped, documented everything, issued a written change order with a new allowance before touching another stud, and still hit our inspection sign-off because the ARCOM-approved materials were ordered early. That’s Clause 1 of the Haven Standard: the price is written before anyone starts, and no work proceeds on a change until the change order is signed.
Second Story Additions
Second story additions are among our most called-for services in Palm Beach, where land values make building up more practical than building out on narrow barrier-island lots. Structural analysis comes first - we need to know whether the existing foundation and walls can carry the load, or whether hollow clay tile construction requires reinforcement that changes the scope. ARCOM review is virtually guaranteed for any visible exterior alteration, and we build that calendar into every bid.
Room Additions & Sunrooms
Room additions and enclosed patios in Palm Beach must match existing architectural character under ARCOM guidelines, which means specifying barrel tile, cast-concrete ornamental detailing, or Pecky cypress ceilings before the permit application goes in. We source through fifty-plus vetted brands - Kohler fixtures, Moen hardware, Caesarstone surfaces when the project calls for modern integration - and every item is written into the quote with a part number, not a placeholder.
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 Palm Beach
We maintain sourcing depth across fifty-plus vetted brands so the written quote carries honest numbers rather than inflated allowances. For Palm Beach additions and ADUs, that means Kohler and Moen plumbing fixtures specified by model, Caesarstone surfaces when the design integrates contemporary elements into historic fabric, and Blanco sinks where the kitchen or wet-bar expansion demands it. We don’t list brands to impress; we name them so you can cross-reference pricing and know the allowance is real. Local supplier relationships in the Palm Beach County market mean we aren’t waiting on coast-to-coast shipping when ARCOM approval windows are already tight.
Common Home Additions & ADU Problems We See in Palm Beach Homes
- Bidding straight new construction without pricing historic substrate repair. Opening an older Palm Beach wall exposes hollow clay tile, undersized framing, and failed waterproofing that the original scope never priced. We inspect first and write allowances into the contract, with any surprise documented and approved in writing before we touch it.
- Missing ARCOM’s Certificate of Appropriateness calendar. On the roughly 1,500-plus landmarked properties, even matching an existing window profile can require a public hearing and blow the draw schedule. Experienced local GCs build the approval calendar into every bid, not just the construction calendar.
- Treating salt-air rebar oxidation as cosmetic. Spalling ‘concrete cancer’ is endemic in pre-1970s Palm Beach structures. What looks like surface repair often reveals load-bearing damage that needs structural intervention mid-rough-in, turning a routine room addition into an unpermitted change order if it wasn’t caught upfront.
- Ignoring flood-zone elevation requirements. The island’s AE and VE FEMA zones require elevated finished floors and reinforced tie-downs that mainland contractors sometimes omit from initial quotes. We pull elevation certificates before we price, not after permits get kicked back.
Pricing for Home Additions & ADU in Palm Beach, FL
Home additions and ADUs in Palm Beach carry premium pricing compared to mainland markets, driven by ARCOM compliance costs, specialty material sourcing, and the structural repair work that opening older walls routinely reveals. Here’s what we see in the local market:
| Service | Price Range in Palm Beach |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
What moves the number: ARCOM approval timelines and material lead times, structural repair of spalling concrete or hollow clay tile substrate, flood-zone elevation requirements, and wind-code upgrades to impact-rated systems. We don’t give “starting at” pricing that balloons later. Under Clause 1 of the Haven Standard, you get a flat written price with a written scope and a written warranty before any work starts. Call (561) 475-3903 for your free estimate.
We Also Serve Cities Near Palm Beach
Our crews work throughout the Palm Beach County metro, including Home Additions & ADU in Palm Beach proper, plus West Palm Beach, North Palm Beach, Greenacres, and Palm Beach Gardens. ARCOM jurisdiction stops at the bridge, but salt-air conditions and hurricane code requirements extend across all these markets, and we apply the same inspection-first discipline wherever we build.
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.
FAQs - Home Additions & ADU in Palm Beach
Yes. Virtually all exterior alterations in the Town of Palm Beach require ARCOM’s Certificate of Appropriateness, and on landmarked properties this runs parallel to standard permitting - not after it. We coordinate both tracks from the start, with ARCOM-experienced architects who understand the material documentation required. Call (561) 475-3903 and we’ll walk through the approval calendar for your specific property.
Hollow clay tile instead of modern framing, undersized structural members by current code, failed waterproofing behind stucco, and rebar spalling from decades of salt-air exposure. We expect this, inspect before we quote, and write allowances into the contract so surprises get priced and approved in writing - not discovered mid-rough-in. Call (561) 475-3903 to schedule an inspection.
Yes, but the design must demonstrate period-appropriate materials and massing that ARCOM finds compatible with the historic district. Coral stone, Pecky cypress, hand-applied stucco, and barrel tile matching Addison Mizner-era originals are typically required. We source these through specialty subcontractors and build the approval calendar into every landmarked-property bid. Call (561) 475-3903 for a free estimate on your specific site.
Three factors: ARCOM compliance adds material and timeline costs that mainland projects don’t carry; salt-air damage to pre-1970s concrete and hollow clay tile construction often requires structural repair once walls are opened; and FEMA flood-zone elevation requirements trigger code upgrades that a surface-level scope misses. We handle this with upfront inspection, written allowances, and signed change orders - the discipline that has kept our projects within a few percent of the agreed price across 4,000-plus jobs. Call (561) 475-3903 for a written quote.
Salt air from the Atlantic and Intracoastal accelerates rebar oxidation and concrete spalling in older structures, requiring structural repair that new construction doesn’t face. Hurricane codes mandate impact-rated windows, reinforced tie-down systems, and elevated finished floors in flood zones - all of which we spec and price before permits are pulled, not after inspection kickbacks. Call (561) 475-3903 and we’ll review the code requirements for your specific Palm Beach property.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Palm Beach since 2007.