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

Fast, Reliable Home Additions & ADU Across Riviera Beach

Home additions in Riviera Beach typically run $45,000 to $130,000, while a detached ADU usually lands between $90,000 and $220,000 depending on size, foundation work, and flood-zone elevation requirements. Most projects in the 33404 zip code take three to seven months from permit pull to final inspection, and the single biggest delay we see is a contractor who didn’t account for FEMA flood rules on the front end. Our Home Additions & ADU team has worked the canal-side streets off Blue Heron Boulevard and the older CBS-block neighborhoods around Broadway long enough to know exactly what the city’s building department will flag before you ever pour a footer. Call (877) 610-1318 and we’ll walk your lot with you before you commit to anything.

Call (877) 610-1318

Why Barrett & Sons Construction Is Riviera Beach’s Preferred Home Additions & ADU Company

Tom Barrett founded this company in 1998, and his sons run the crews. That’s not marketing talk. When you hire us for an addition or ADU in Riviera Beach, the person who signs your change orders is the same person who shows up at the permit counter and the same person you’ll see at the hardware store on Saturday. We’re owner-operated, not a franchise dispatching strangers to your door.

Every job we take in Riviera Beach gets permits pulled and inspections signed, period. The permit inspector works for you, not for me. That’s the whole point. We publish Tom’s name, address, and license number, so you can look it up before you sign anything. We’ve been answering our own phone for 29 years, and a live person picks up 24 hours a day, 7 days a week. Not a voicemail box, not an out-of-state call center.

Our work in Riviera Beach is backed by a 90-Day Done Right Promise written on every contract. If it’s not done right, Tom comes back and makes it right, one call. No fine print, no argument.

Our Home Additions & ADU Services in Riviera Beach

ADU Design & Permitting

Riviera Beach parcels in AE and VE flood zones carry elevation rules that most designers never mention until it’s too late. We handle the full design and permitting path, including FEMA Base Flood Elevation reviews and Coastal Construction Control Line setbacks when your lot falls inside the boundary. A typical permitted ADU design package in Riviera Beach runs $4,000 to $12,000 before construction begins, and we put every allowance in writing before you spend a dollar.

Garage Conversion ADU

Converting an attached garage in Riviera Beach is usually the most cost-effective ADU route, running $30,000 to $80,000 depending on whether you’re retrofitting an existing 1960s CBS structure or rebuilding from the slab. The big local gotcha is the FEMA substantial improvement rule: if your conversion cost exceeds 50% of the structure’s assessed value, the entire building must be raised to current Base Flood Elevation. We check that threshold before you commit, because the last contractor most customers used didn’t.

New Detached ADU

Building a detached ADU in Riviera Beach means elevated foundations, flood-resistant materials below the design flood elevation, and hot-dipped galvanized or stainless hardware on every exposed connector. Atlantic salt air chews through standard fasteners in a few years. A new detached ADU here runs $90,000 to $220,000, and the range swings on whether your lot requires fill, piers, or full stem-wall elevation. We’ll tell you the number before we dig.

Junior ADU & Interior Conversion

For homeowners in mainland neighborhoods like Broadway and Old Riviera with underused interior space, a junior ADU or interior conversion is often the fastest path to rental income or multigenerational housing. These projects run $20,000 to $60,000 depending on plumbing and egress work, and they typically pull a simpler permit than ground-up construction. If you’re already planning a Kitchen Remodeling in Riviera Beach or a Bathroom Remodeling in Riviera Beach, we can scope the ADU conversion in the same permit set and save you a second round of inspections.

Trusted Brands We Service in Riviera Beach

We run Techo-Bloc and Cambridge Pavers on hardscape tie-ins around new additions, and we keep Quikrete products staged locally for fast foundation and masonry work across Riviera Beach. You won’t see mystery brands off a van on our jobs. Every material we install is one you can look up, from the footing to the flashing. That’s how Tom has done it since 1998, and that’s why our Riviera Beach customers don’t get surprise invoices at the end.

Common Home Additions & ADU Problems We See in Riviera Beach Homes

• FEMA substantial improvement triggers: Along the canal-side streets off Blue Heron Boulevard, a renovation that exceeds 50% of assessed value forces a full elevation to current Base Flood Elevation. We’ve seen projects die mid-renovation because a contractor didn’t run that check before the first nail moved.
• Salt-air corrosion on structural hardware: The Atlantic environment on Singer Island and along the Intracoastal corrodes untreated fasteners, rebar, and connectors within a few years. We spec hot-dipped galvanized or stainless steel on every exposed or embedded component to pass inspection and stay standing.
• Pre-1994 CBS homes with outdated wind-load ratings: Many 1950s through 1970s concrete block homes in Broadway and Old Riviera predate post-Hurricane Andrew codes. Tying a new addition into an existing structure means verifying the original wall and roof connections meet current Palm Beach County uplift standards before you build.
• Aging flat and low-slope roofs on existing structures: Riviera Beach’s mainland housing stock has a high share of original flat or low-slope roofs that fail current wind uplift requirements. A room addition or second story often means fully replacing the existing roof, not just tying into it, and that cost belongs in the scope before you sign.

Pricing for Home Additions & ADU in Riviera Beach, FL

We Also Serve Cities Near Riviera Beach

Our crews work locally across Lake Park, North Palm Beach, Palm Beach, and West Gate, so if you’re just outside the Riviera Beach line, we can still get to you quickly. We coordinate scheduling from our South Florida office, but the people on your job know these streets, not just a map on a tablet. Ask anyone on your street, or look up the license number yourself. Call (877) 610-1318 and we’ll come take a look.

FAQs - Home Additions & ADU in Riviera Beach