Home Additions & ADU in West Palm Beach - One Fixed Price, Permits Handled

Fast, Reliable Home Additions & ADU Across West Palm Beach

A home addition or ADU in West Palm Beach typically runs $45,000-$130,000 for a room addition and $90,000-$220,000 for a detached ADU, with permits, impact-rated glazing, and coastal-spec hardware built into the written quote from the start. We’re Rowan Construction Group, and our Home Additions & ADU crews serve West Palm Beach from our South Florida dispatch office, carrying the same discipline we’ve applied to 4,000-plus projects since 2007: a flat written price before any work starts, a signed change order before any change proceeds, and a documented photo record when the crew leaves. Call (561) 475-3903 to schedule your free estimate.

Call (561) 475-3903

Why Rowan Construction Group West Palm Beach Is West Palm Beach’s Preferred Home Additions & ADU Company

We’ve built second-story additions above 1950s CBS ranch homes in Greenacres-adjacent West Palm Beach neighborhoods and converted garages into junior ADUs in El Cid, where the Historic Preservation Board reviews every exterior material choice. Our customers in West Palm Beach leave reviews that mention the same things: the written price matched the final invoice, the crew showed up in uniform, and the photo record documented every phase. We’re not guessing at local conditions. We know that a permit pulled in Flamingo Park without Board pre-approval can stall a project for weeks, and we know that the water table near Lake Worth Lagoon sits shallow enough to require dewatering on any below-grade work. That local knowledge keeps schedules intact and change orders rare.

Under Clause 1 of The Haven Standard, the price is written before anyone picks up a tool. Under Clause 3, no change proceeds without a signed change order. That’s the administrative discipline Haven acquired Rowan for, and it’s why our projects finish within a few percent of the agreed number. We also offer a Free Second Opinion on any written estimate from another contractor - bring us their line items and we’ll review them at no charge.

Our Home Additions & ADU Services in West Palm Beach

ADU Design & Permitting

West Palm Beach’s ADU ordinance allows detached units, garage conversions, and junior ADUs within the primary residence, but the permitting path splits based on location. Downtown and waterfront additions must meet Wind-Borne Debris Region standards at 130+ mph design wind speed, requiring impact-rated openings or tested shutter systems. In El Cid, Flamingo Park, or Northwood Hills, the Historic Preservation Board must sign off on exterior envelope and materials before the building department issues the permit. We handle both tracks, preparing the hardware schedule and glazing spec as part of the initial quote so the inspection sequence is pre-staged, not improvised.

Garage Conversion ADU

Garage conversions are one of the most cost-effective ways to add permitted square footage in West Palm Beach, typically running $30,000-$80,000. The existing slab and roof structure reduce foundation and framing costs, but the conversion still must meet current Florida Building Code for energy, egress, and - in the Wind-Borne Debris Region - impact protection. In El Cid, we framed a garage conversion ADU and rear room addition on a 1941 CBS house with original Dade County pine sill plates; the pine was so resin-dense our crew pre-drilled every fastener, and the original cast-in straps tied the new load-bearing beam to the existing slab. Because the house sits in the Wind-Borne Debris Region, we specified impact-rated sliding glass doors and stainless connector hardware on the new porch posts, then passed the city’s secondary water barrier and clip/strap inspection sign-off on the first rough-in walk. The documented photo record showed the customer every step.

New Detached ADU

A new detached ADU in West Palm Beach is essentially a small custom home, and our range of $90,000-$220,000 reflects the variance in size, finish level, and site conditions. The water table across much of West Palm Beach sits 18-36 inches below grade, so any below-grade footing or utility rough-in requires active dewatering - a line item we include in the written quote, not an allowance that disappears later. We specify marine-grade finishes and stainless or hot-dip galvanized hardware on all coastal-exposed elements, because inland-grade galvanized fasteners and thin-wall aluminum window frames pit and chalk within a few seasons of salt air near the Lagoon. The cheap spec costs more within a decade.

Junior ADU & Interior Conversion

Junior ADUs convert existing interior space - a basement, attic, or large bedroom wing - into a separate dwelling unit with its own entrance and kitchenette. In West Palm Beach’s post-WWII CBS ranch stock, these conversions avoid exterior envelope complications but still require careful MEP routing through slab-on-grade construction. We map the existing electrical panel capacity, water heater location, and sewer lateral before quoting, because surprises in those three systems drive most interior conversion change orders.

Room Additions & Second Story Additions

Room additions and second-story additions in West Palm Beach must tie into existing structures that may pre-date current wind codes. In 1920s-1940s neighborhoods, we often find original roof decks without secondary water barriers and cast-in-place straps that don’t meet current clip/strap spacing. We inspect and document these conditions before quoting, because re-roofing or adding load to a West Palm Beach home routinely triggers mandatory secondary water barrier and clip/strap upgrade inspections that can add days if not pre-staged. Hurricane Frances and Hurricane Jeanne made near-direct strikes on Palm Beach County just three weeks apart in September 2004 - a back-to-back hit no other major South Florida metro experienced - and local inspectors still reference that event as a baseline for tie-down scrutiny.

Sunrooms & Enclosed Patios

Sunrooms and enclosed patios in West Palm Beach occupy a permitting middle ground: if conditioned and tied to the home’s HVAC, they’re additions; if unconditioned with independent ventilation, they’re alternations. The distinction matters for impact-rated glazing requirements and energy code compliance. We determine the classification during the first site visit and quote accordingly, with no category-shifting after permit pull.

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Trusted Brands We Service in West Palm Beach

Our sourcing depth across fifty-plus vetted brands gives the written quote honest numbers rather than inflated ones. For West Palm Beach additions and ADUs, we regularly specify Kohler fixtures for their corrosion-resistant finishes in salt-air environments, Moen valves with marine-grade plating, and Caesarstone surfaces for kitchenette and bathroom durability. We don’t list every brand to impress; we name the ones that solve the specific failure modes we see here. Blanco undermount sinks with proper sealant detailing prevent the joint degradation that plagues lesser products in humid, coastal conditions. Every specification is documented in the written scope, and substitutions require a signed change order.

Common Home Additions & ADU Problems We See in West Palm Beach Homes

• Coastal-spec shortcuts on hardware and finishes. Inland-grade galvanized fasteners, thin-wall aluminum window frames, and non-stainless railings pit and chalk within a few seasons of salt air near Lake Worth Lagoon, forcing early replacement on an addition that should have lasted decades. We specify stainless or hot-dip galvanized hardware and impact-rated, powder-coated aluminum or vinyl-clad window frames as standard.
• Historic Preservation Board delays. Homeowners pull permits for exterior changes in El Cid, Flamingo Park, or Northwood Hills before Board review, then the scope of work stalls mid-project and the draw schedule slips. We file Board applications concurrently with building department pre-application, not sequentially.
• Water-table surprises on below-grade work. The 18-36 inch water table across much of West Palm Beach makes any below-grade footing, ADU utility rough-in, or slab work require active dewatering that wasn’t in the original allowance. This is a top source of change orders on West Palm Beach additions when contractors treat it as an afterthought.
• Re-roofing trigger inspections on additions tied to existing structures. Adding square footage to a home with a roof older than 2004 often triggers mandatory secondary water barrier and clip/strap upgrade inspections. We inspect the existing roof deck during the initial site visit and include any required upgrades in the written quote.

Pricing for Home Additions & ADU in West Palm Beach, FL

We Also Serve Cities Near West Palm Beach

Our crews work throughout Palm Beach County and beyond, including Home Additions & ADU in West Palm Beach proper plus Palm Beach, Greenacres, North Palm Beach, and Palm Beach Gardens. The same written-price discipline, the same documented photo record, the same 365-Day Done Right Promise applies in every city we serve.

FAQs - Home Additions & ADU in West Palm Beach