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 Hobe Sound
A high-end room addition or ADU in Hobe Sound typically runs $45,000 to $130,000 for the addition itself and $90,000 to $220,000 for a fully permitted detached ADU. The schedule is set by Martin County plan review and inspection cycles more than by crew calendars, and on Jupiter Island parcels, state DEP Coastal Construction Control Line permits add another layer. We’re Barrett & Sons Construction, and our Home Additions & ADU team has worked through enough Hobe Sound permitting sequences to know exactly how to sequence the work. Call (877) 610-1318 for a free estimate and a written scope before you order anything.
Why Barrett & Sons Construction Is Hobe Sound’s Preferred Home Additions & ADU Company
Hobe Sound homeowners don’t get a franchise dispatcher with us. Tom Barrett owns the company, his sons run the crews, and the name on the truck matches the name on the license. That matters in Martin County, where the building department reads plans closely and homeowners who’ve been through one bad job want to see the face behind the estimate. We publish our name, address, and license number, and you can look all of it up before you sign.
Our clients in 33455 and 33475 tell us the same thing: the last contractor quoted one price on the phone and showed up with another. We don’t do that. Every scope, every allowance, every change order arrives in writing before work moves. Tom Barrett’s rule is simple: an allowance that isn’t on paper is a surprise waiting for a date. The 90-Day Done Right Promise is written on every contract. If something’s not right, one call brings Tom back.
Locally, we know the difference between an inland CBS ranch off Bridge Road and a custom estate on Jupiter Island. The materials, the detailing, and the inspection sequencing are not the same job. Homeowners in Hobe Sound regularly tell us Martin County’s inspectors are more conservative than the ones they’ve dealt with south in Palm Beach County. We plan for that from the first site visit, not the third week of a delayed rough-in.
Our Home Additions & ADU Services in Hobe Sound
ADU Design & Permitting
Hobe Sound sits entirely within Martin County, where growth-management rules have been in force since the 1980s. Plan review runs slower here than in neighboring jurisdictions, and we’ve seen homeowners start demolition before the permit was actually issued, leaving a torn-open addition exposed for weeks. We don’t let that happen. We sequence the design, the county submittal, and the ordering of long-lead materials so the permit is in hand before a single wall comes down.
New Detached ADU
Detached ADUs in Hobe Sound run $90,000 to $220,000 depending on finish level, foundation conditions, and whether the parcel sits seaward of the Coastal Construction Control Line. On Jupiter Island, you’re adding a state DEP permit on top of the county permit, and that adds weeks. We build these as full living units: kitchen, bath, separate meter where county rules allow it, and storm-rated connections. Premium materials are specified up front, in writing, with the exact allowance for each line item.
Garage Conversion ADU
Converting an attached or detached garage in Hobe Sound runs $30,000 to $80,000. Older inland CBS ranches from the 1960s and 1970s often need electrical panel upgrades and roof-to-wall connection improvements before the conversion can pass inspection. We handle the full permit package, the structural upgrades, and the finish work. The question we get most often: can a garage conversion legally become a full-time ADU with a kitchen and bath? The answer in most Hobe Sound residential zones is yes, provided the county approves the change of use and the utility separation.
Junior ADU & Interior Conversion
A junior ADU carved out of an existing home, often a finished lower level or a large bonus room, is the most cost-conscious path for Hobe Sound homeowners who need a separate living space without building from the ground up. These projects still require Martin County plan review, and we’ve converted enclosed patios and interior rooms across 33455 and 33475. The key on older ranch homes is confirming the existing framing and electrical can carry the new load before you commit to the design.
Sunrooms & Enclosed Patios
Hobe Sound’s salt-laden air eats standard hardware. On a 1970s CBS ranch off Bridge Road in 33455, our crew converted an enclosed patio into a permitted sunroom addition. We replaced corroded anchors and added hurricane-rated strapping at the roof-to-wall connection before framing new load-bearing openings for impact-glazed windows. The homeowner’s Kohler fixtures and Cambria countertop slab were selected early, then we held the rough-in inspection until Martin County’s inspector was booked. Sign-off took two scheduled visits, but the draw schedule stayed on track because every allowance and change order was locked in writing before we ordered long-lead doors.
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 Hobe Sound
We specify brands our clients can look up, not mystery products off a van. On Hobe Sound windows and impact-rated openings, we work with PGT, CGI, and Simonton, all of which have proven track records in South Florida’s wind and salt environment. For interior finishes, our designers coordinate directly with Cambria, KraftMaid, and Kohler. Because Hobe Sound is a small market with fewer supplier warehouses, lead times on these brands set the schedule as much as the county does. That’s why we order early and fix the price before the purchase order goes out.
Common Home Additions & ADU Problems We See in Hobe Sound Homes
- Underestimating Martin County review and inspection times. Hobe Sound plan review consistently runs longer than what contractors from Jupiter or Port St. Lucie expect when they cross the county line. Demolition that starts before the permit is issued leaves a torn-open addition exposed for weeks, and that’s a failure we inherit from other contractors.
- Specifying interior-grade fasteners and connectors near the coast. On barrier-island second-story additions, salt air corrodes standard hardware within a couple of hurricane seasons. We specify stainless and coated hardware for every connection within reach of ocean moisture.
- Waiting to pick custom millwork or architectural glass until after rough-in. Custom millwork, architectural glass, and specialty finishes in Hobe Sound are long-lead orders. Choose them after the rough-in is done and the punch list pushes into next season. We lock selections early and write them into the contract.
- Ignoring roof-to-wall connections on pre-2002 concrete block homes. Many Hobe Sound ranch homes predate Florida’s post-Hurricane Andrew building code overhaul, and their roof-to-wall connections don’t meet current standards. A room addition that ties into an under-connected existing roof won’t pass a Martin County inspection until the connections are upgraded.
Pricing for Home Additions & ADU in Hobe Sound, FL
Below are the ranges we quote for Hobe Sound work. These are real numbers based on Martin County permitting costs, local material lead times, and the finish levels common across 33455 and 33475. No change orders materialize mid-job without a written signature from you first.
| Project Type | Typical Hobe Sound Range |
|---|---|
| Home Addition | $45,000 - $130,000 |
| ADU Construction | $90,000 - $220,000 |
| Garage Conversion | $30,000 - $80,000 |
| Kitchen Remodel | $14,000 - $45,000 |
| Bathroom Remodel | $9,000 - $28,000 |
Hobe Sound straddles two very different markets under the same restrictive county rules. An inland CBS ranch can support a mid-range addition, while a Jupiter Island estate demands storm-hardened structural systems, luxury-spec millwork, and architectural glass that push the number toward the top of the range, sometimes beyond it. The price you sign is the price you pay. Every allowance is in writing, every change order is issued before the work changes, and the 90-Day Done Right Promise is on the contract. Call (877) 610-1318 for a free, line-item estimate.
We Also Serve Cities Near Hobe Sound
Beyond Hobe Sound itself, our crews regularly work in Tequesta, Jupiter, Palm Beach Gardens, and North Palm Beach. Each of those cities operates under Palm Beach County rules, which are different from Martin County’s, and we handle both. If you’re in one of those communities, our Home Additions & ADU in Hobe Sound team can walk you through the differences. Call (877) 610-1318 and we’ll tell you straight what applies to your parcel.
Serving Hobe Sound, FL - Our Local Coverage Area
We’re based in the Hobe Sound 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 Hobe Sound
Any new construction or substantial improvement seaward of Florida’s Coastal Construction Control Line requires a state DEP permit in addition to Martin County’s permit. Most Jupiter Island parcels fall within that zone, so a second-story addition there carries two parallel review tracks. The DEP review adds weeks, not days, and we schedule it from the start so the county inspection doesn’t stall waiting on Tallahassee. Call (877) 610-1318 and we’ll check your parcel against the CCCL before you spend a dime on design.
The two things that blow an ADU budget in Hobe Sound are late selection changes and surprise structural upgrades. We fix selections early: cabinetry line, countertop material, window package, flooring. We also inspect the existing home’s roof-to-wall connections and electrical panel before the permit drawing is finalized, so the contract reflects the real structural scope. Fixed allowances in writing, zero change orders without signature. Call (877) 610-1318 for an exact scope on your lot.
It means the existing roof framing wasn’t originally tied to the concrete block walls with enough steel to meet current code. When we add a room onto a pre-2002 Hobe Sound ranch, Martin County requires the new work to meet current standards, and the connection point with the old roof has to be strengthened too. We install hurricane-rated strapping and anchors at that junction before the inspector signs the rough-in. It’s a real line item, and it’s in the written scope up front. Call (877) 610-1318 to see if your home needs it.
Martin County’s building department is known locally for thorough plan review and conservative code interpretations. Contractors who mostly work in Palm Beach County or St. Lucie County routinely underestimate how long review cycles and inspection bookings take when they first take on a Hobe Sound project. We’ve worked in the county long enough that we schedule inspections around the county’s actual calendar, not the one a contractor wishes he had. The permit inspector works for you, not for me, and that’s why we plan around him. Call (877) 610-1318 for a realistic schedule on your project.
Yes, in most Hobe Sound residential zones, a garage conversion can legally become a full-time ADU with a kitchen and bath, provided the county approves the change of use, the utility separation, and any required parking replacement. Older CBS garages may also need electrical panel upgrades and roof-to-wall connection improvements before the conversion passes inspection. We handle the full Martin County permit package. Call (877) 610-1318 and we’ll check your specific zoning before you commit.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Hobe Sound since 1998.