Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Before
After
Before
After
Before
AfterFast, Reliable Home Additions & ADU Across Sunny Isles Beach
Home additions and ADU construction in Sunny Isles Beach run $45,000-$130,000 for a standard addition, $90,000-$220,000 for a new detached ADU, and $30,000-$80,000 for a garage conversion. Those numbers reflect the reality of building on a razor-thin barrier island with Miami-Dade’s High Velocity Hurricane Zone code and salt-spray corrosion rules layered on top. We’re Barrett & Sons Construction, owner-operated since 1998, and we know how to pull permits, stage a crew, and pass inspection on this island without letting the process turn into a surprise. Call (877) 610-1318 for a free estimate and a written scope of work before anything starts.
Why Barrett & Sons Construction Is Sunny Isles Beach’s Preferred Home Additions & ADU Company
Tom Barrett’s name is on the truck, his sons run the crews, and he lives close enough that he’ll see you at the grocery store long after the final inspection signs off. We’ve been doing this since 1998, and the way we work hasn’t changed: every scope, every allowance, every price change arrives as a written change order before a single nail moves. That matters in Sunny Isles Beach, where condo associations, building department reviewers, and HVHZ inspectors each want documentation their own way, and where an unwritten “understanding” is a stop-work order waiting to happen.
The permit inspector works for you, not for me, that’s why I like him. In Sunny Isles Beach, that inspector is enforcing a code most inland contractors never touch. We’ve been through enough HVHZ plan reviews on Collins Avenue to know exactly what the reviewer wants to see on the first submission, continuous load-path calcs, impact-rated glazing schedules, and fastener specifications with corrosion-resistant coatings. That’s how we keep a project moving when other crews are waiting on re-inspections.
When you call our Home Additions & ADU team, a live person answers. Not a voicemail box, not an out-of-state call center. And if something isn’t done right, the 90-Day Done Right Promise is written on the contract: one call brings Tom back. For homeowners in Sunny Isles Beach who’ve been burned by a national company with a call script and a bait price, that’s the difference between signing with confidence and signing with crossed fingers.
Our Home Additions & ADU Services in Sunny Isles Beach
ADU Design & Permitting
Every ADU in Sunny Isles Beach starts with documentation, not demolition. We design to Miami-Dade HVHZ standards from the first drawing, not as an afterthought when the reviewer kicks it back. That means continuous load-path connectors at every structural transition, impact-rated windows and doors listed on the glazing schedule, and corrosion-resistant fasteners specified in the materials schedule. The permit path here is dual-track: standard Florida Building Code review plus the HVHZ overlay. We prepare both sets simultaneously so the project doesn’t stall in plan review for six weeks while an inland consultant learns the difference.
Garage Conversion ADU
In Sunny Isles Beach, the garages we convert are almost always inside older mid-rise condos from the 60s and 70s, the remaining low-rise stock that hasn’t been razed for supertalls yet. That changes everything. Shared walls between formerly parking-adjacent units need fire-rating verification per the condo association’s rules, not just the building code. The slab has to be checked for the dewatering issues that come with this island’s water table sitting barely below grade. And the HOA will want your entire scope, allowances, and change order process in writing before they’ll even schedule a board review. We handle all three tracks at once.
New Detached ADU
True detached ADUs are rare in Sunny Isles Beach because there’s almost no land to detach onto. A Sunny Isles Beach property might be a leftover single-family lot from before the tower boom, or a garden condo parcel with enough setback to add a structure. Either way, you’re building on loose barrier-island sand, which means deep pile foundations, continuous dewatering during excavation, and stainless or epoxy-coated hardware everywhere the salt spray can reach. Budget for the foundation like it’s a five-story building, because in this soil and this code zone, it has to perform like one.
Junior ADU & Interior Conversion
This is the most common ADU route in Sunny Isles Beach, and the one we know best. A ground-floor utility room, a former lobby storage closet, or an oversized laundry space inside a Collins Avenue condo becomes a legal Junior ADU. But even a 400-square-foot interior conversion triggers HVHZ review if you’re touching the building envelope, and if you’re adding a kitchenette, the ventilation and electrical changes have to satisfy both Miami-Dade code and the association’s governing documents. We document everything the HOA needs to see before the first wall comes down, because an allowance that isn’t on paper is a surprise waiting for a date.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Sunny Isles Beach
We install windows and doors from PGT, Simonton, and CGI, all of which carry Miami-Dade HVHZ approval ratings for impact-resistance. On an island where every exterior opening gets hit by Atlantic salt spray and hurricane wind loads, we won’t put a non-rated unit in an ADU or addition, period. We order directly from local South Florida distributors, so lead times stay honest and warranty registration is handled properly. If you’re planning a conversion or addition that touches the building envelope, we’ll spec the glazing so the plan reviewer sees the right product the first time.
Common Home Additions & ADU Problems We See in Sunny Isles Beach Homes
- HVHZ plan review rejection. Inland contractors regularly submit ADU plans with wind-uplift calcs that don’t pass Miami-Dade’s High Velocity Hurricane Zone review. The reviewer has to kick it back, and the homeowner eats weeks of delay plus re-inspection fees. We submit HVHZ-compliant load-path and glazing schedules from the start.
- Salt-spray corrosion on fasteners and anchors. Even routine framing on this island needs stainless or epoxy-coated hardware. Standard zinc-coated fasteners rust within months, leaving structural connections weakened and ready to fail the next inspection. We stock corrosion-rated hardware for every Sunny Isles Beach job, no exceptions.
- Shared-wall fire-rating surprises in condo garages. A garage conversion inside an older Collins Avenue building often shares a wall with a neighbor’s unit or common area. If that wall’s fire rating isn’t verified and documented up front, the city’s building department can issue a stop-work order. We confirm the rating before we touch the wall.
- Staging and parking without a yard to stage in. The island is three to four blocks wide. There’s no place to park a dumpster, a material trailer, and a crew truck without blocking someone’s access or violating association rules. We plan staging and parking before the quote, because on a constrained Sunny Isles Beach site, access is a line item.
Pricing for Home Additions & ADU in Sunny Isles Beach, FL
Here’s what our customers in the 33160 zip code actually pay, based on the jobs we’ve bid and built here.
| Project Type | Typical Range in Sunny Isles Beach |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion | $30,000-$80,000 |
What moves the number? On this island, the big variables are dewatering during excavation, the cost of HVHZ-rated glazing and corrosion-resistant hardware, and staging. A ground-floor Junior ADU in a mid-rise with elevator access and an HOA that allows daytime work costs less than a garage conversion where every piece of material has to be hand-carried from a parking spot two blocks away. Salt-spray exposure means we spec epoxy-coated rebar and stainless anchors even on small jobs, and that’s not optional if you want to pass inspection. Call (877) 610-1318 for an exact quote. Estimates are free, written, and line-itemed.
We Also Serve Cities Near Sunny Isles Beach
Our Home Additions & ADU crews also cover North Miami Beach, Ojus, Aventura, and Hallandale Beach. The HVHZ requirements don’t stop at the Sunny Isles Beach city line, and we bring the same written change order process and permit discipline to every job in the corridor. If you’re just over the bridge in Aventura or down the road in Hallandale, we’re close enough to walk the site before we bid.
Serving Sunny Isles Beach, FL - Our Local Coverage Area
We’re based in the Sunny Isles 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 Sunny Isles Beach
Yes. Any ADU or interior conversion in Sunny Isles Beach that touches the building envelope or structural system triggers Miami-Dade’s High Velocity Hurricane Zone dual-permit review, separate from and stricter than standard Florida Building Code review. Even a small Junior ADU with a new exterior door or window must show continuous load-path connections, impact-rated glazing, and wind-uplift calculations. This requirement applies here and not in neighboring cities like Aventura or Golden Beach, where standard code governs. Call (877) 610-1318 and we’ll tell you exactly what your project triggers before you pay a dollar.
Maybe, but the tower’s condo association rules control more than the city does. Your building’s governing documents will dictate whether a garage conversion is allowed at all, what fire-rating the shared walls must meet, and whether the HOA requires your entire scope and change order process in writing before board review. We’ve worked inside enough Collins Avenue high-rises to know that the association’s architectural review committee can be the longest lead time in the whole project. If the board says no, no permit gets pulled. If they say yes, we handle the HVHZ plan review and the HOA documentation together.
Sunny Isles Beach is roughly three to four blocks wide between the Atlantic and the Intracoastal. That means most projects have zero on-site staging area. No yard for a dumpster, no driveway for a material trailer. We plan parking and staging before we write the quote, including where the dumpster sits, how materials get from the truck to the unit, and what work hours the association allows. On this island, access is a real cost, and we put it in writing so it doesn’t become a change order battle mid-project. Call (877) 610-1318 for a quote that includes staging, not one that pretends it’s free.
Because the island is about 1,500 feet wide at its widest point, every construction site is within direct salt-spray range of both the ocean and the Intracoastal. That requires stainless steel or epoxy-coated fasteners, higher concrete cover specs over rebar, and corrosion-resistant embedded anchors, all of which the HVHZ inspector verifies. Standard zinc-coated hardware from the big box store will rust within months and fail inspection. We stock and specify corrosion-rated materials on every Sunny Isles Beach job, no exceptions and no substitutions.
In writing, before the work happens. Every scope change, every allowance adjustment, and every price movement comes to you as a written change order with the cost and schedule impact stated on paper. No verbal “I thought that was included” conversations. In a Sunny Isles Beach high-rise, that written trail also keeps the HOA satisfied, because they want to see documentation for every unit owner and every change. If a change isn’t signed, the crew doesn’t start it. Call (877) 610-1318 to talk through your project.
Contact Barrett & Sons Construction in Sunny Isles Beach
If you’re planning a home addition, garage conversion, or Junior ADU in Sunny Isles Beach, call us at (877) 610-1318 for a free estimate. Tom Barrett will walk the site himself, we’ll write the scope and the price on paper, and you’ll know exactly what the HVHZ review, the HOA, and the dewatering are going to require before you sign anything. No surprise invoices, no bait price on the phone. Just a written quote from a company that’s been standing behind its work since 1998.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Sunny Isles Beach and South Florida since 1998.