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 Sunny Isles Beach
A home addition or ADU in Sunny Isles Beach typically runs $45,000 to $130,000, and on this barrier island the real cost drivers are access, staging, and salt-air hardware specs that inland contractors never think about. If you’re weighing a detached ADU, a second-story addition, or a garage conversion in the 33160 ZIP, the quote you get will depend as much on how the crew can reach the site as on square footage. Call us at (877) 610-1318 and we’ll walk the lot, look at the access, and give you a written line-item scope before you commit to anything.
We’ve worked up and down Collins Avenue and the side streets off 174th and 183rd, and we know what it takes to pull permits through the City of Sunny Isles Beach building department without getting tangled in re-inspections. The Home Additions & ADU team at Barrett & Sons Construction has been doing this work owner-operated since 1998, and Tom Barrett’s name and license number are published for you to verify. That matters on an island where half the horror stories come from contractors who quoted inland prices and then discovered what a dewatering plan costs.
Why Barrett & Sons Construction Is Sunny Isles Beach’s Preferred Home Additions & ADU Company
We’re the owner-operated alternative to national outfits that send a salesman with a tablet and then hand the job to strangers. Tom Barrett and his sons are on-site most days, and that’s not a slogan. On Sunny Isles Beach, where every addition is inside a dense condo canyon or directly against a shared wall, you need a crew that knows the building department inspectors by name and has passed the HVHZ pathway more times than we can count.
Our reputation among Sunny Isles Beach customers comes from doing what we say. Every allowance is written. Every change order arrives on paper before a single nail moves. Every permit gets pulled and every inspection gets signed. The 90-Day Done Right Promise is written on every contract: if something isn’t done right, Tom comes back. One call.
We coordinate our Sunny Isles Beach work through our South Florida office, and a live person answers the phone 24 hours a day. You won’t get a voicemail box when you call about your ADU foundation concerns at 9 p.m.
Our Home Additions & ADU Services in Sunny Isles Beach
ADU Design & Permitting
On Sunny Isles Beach, design and permitting is where the budget gets decided. The City pulls every ADU plan into Miami-Dade’s High Velocity Hurricane Zone review, which is separate and more demanding than what a contractor in Aventura or even Hallandale Beach faces. We draw to HVHZ wind-load calcs and continuous load-path specs from day one, so the plan set goes through on the first submittal instead of the third. Since the island is a thin strip between the Atlantic and the Intracoastal, we also spec stainless or epoxy-coated hardware for embedded anchors from the outset, because salt spray reaches every site.
New Detached ADU
A new detached ADU in Sunny Isles Beach runs $90,000 to $220,000, and the spread comes down to foundation depth and access. The water table here sits about two feet down, so any detached unit needs continuous dewatering during excavation, or the hole collapses. We build that cost into the written scope so there’s no surprise invoice at the end. Most lots off Collins Avenue are tight, so we schedule deliveries around valet lanes and HOA loading docks, and we keep the entire scope taped to the temporary fence so the neighbors and the building manager can see what’s happening.
Second Story Additions
Adding a second story in Sunny Isles Beach means working above occupied units, and that changes everything about staging and noise. We post party-wall notices during HOA quiet hours, run our crews on the building’s work-hour schedule, and sequence rough-in inspections so they sign off before the afternoon heat bakes the west side of the tower. A second-story addition usually lands between $45,000 and $130,000, with the final number driven by the existing structural condition of the 1960s-era slab-on-grade buildings still left on the island.
Garage Conversion ADU
A garage conversion in Sunny Isles Beach typically runs $30,000 to $80,000. On this island, most garages are inside or directly beneath high-rise structures, so slab moisture and ventilation are the first things we check. The HOA rules for converting a garage inside a luxury tower are strict, and we’ve guided enough Sunny Isles Beach owners through them to know what the board will ask for. We’ll handle the HOA application package and the building permit together so they don’t conflict.
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 Sunny Isles Beach
We carry premium-name materials across every trade we touch, because you should be able to look up what goes into your walls. On Sunny Isles Beach ADU and addition jobs we regularly spec Simonton, PGT, and CGI impact-rated windows and doors, which are the brands that actually pass HVHZ glazing inspections without a fight. If the HOA has a specific impact-glazing standard for the exterior skin of your new addition, we stock and source those lines locally so turnaround doesn’t stall. You’ll never get mystery-brand hardware off a van.
Common Home Additions & ADU Problems We See in Sunny Isles Beach Homes
- Dewatering surprises: Excavate more than two feet for an ADU foundation on this island and you hit groundwater. We include a dewatering plan and continuous pumping in the written scope from the first estimate, because a collapsed excavation ruins a pour and blows the schedule.
- HVHZ re-inspections: A contractor used to standard Florida Building Code will fail the impact-glazing and load-path connector checks on a second-story addition here and get a stop-work order. We pull the HVHZ pathway from plan-set day one, so the inspector verifies what he needs to verify the first time.
- Salt-spray rust on embedded anchors: Standard zinc-plated fasteners on an ADU tie-down in Sunny Isles Beach mean rust streaks down stucco within the first rainy season. We spec stainless or epoxy-coated hardware even on jobs where it seems like overkill, because on a 1,500-foot-wide island it isn’t.
- Shared-wall scheduling conflicts: On a tight lot off Collins Ave, your ADU framing crew shares the wall and the loading zone with a dozen occupied units. If the party-wall notice isn’t posted right and the noise schedule isn’t respected, the HOA shuts the job down. We handle the notices and the hours so you don’t have to.
Pricing for Home Additions & ADU in Sunny Isles Beach, FL
Here’s what we see in Sunny Isles Beach right now. A full home addition generally lands between $45,000 and $130,000 depending on access, structural condition, and HOA requirements. Detached ADUs run $90,000 to $220,000 because of the foundation and dewatering work. Garage conversions range $30,000 to $80,000. Second-story additions fall in the $45,000 to $130,000 band. Every quote we give is line-itemed, every allowance is written, and every scope change comes to you as a written change order before work proceeds. You’ll know the number before you sign, and the number won’t move unless you move it.
| Project Type | Sunny Isles Beach Price Range |
|---|---|
| New Detached ADU | $90,000-$220,000 |
| Second Story Addition | $45,000-$130,000 |
| Garage Conversion ADU | $30,000-$80,000 |
We Also Serve Cities Near Sunny Isles Beach
Our crews cover Sunny Isles Beach and the surrounding South Florida communities, including North Miami Beach, Ojus, Aventura, and Hallandale Beach. When you call Home Additions & ADU in Sunny Isles Beach, you’re talking to the same crew that works those neighboring cities, and we know the local building departments well enough to keep your permit moving. Same phone, same written-scope promise, same 90-Day Done Right Promise.
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, if any excavation is required. On Sunny Isles Beach, groundwater sits about two feet below grade in most areas, so even shallow footings, utility trenches, or a small garage-conversion slab hit water quickly. We include a dewatering plan and continuous pumping in the written scope for any job that breaks ground, and if your ADU is entirely above grade with no excavation, we’ll tell you that in writing too. Call (877) 610-1318 to have us walk your specific lot and tell you which applies.
The HVHZ is Miami-Dade’s post-Hurricane Andrew code, and it requires a continuous load path from the roof down to the foundation, with impact-rated glazing on every opening. For a second-story addition on an older low-rise, this means the existing first-story structure often needs reinforcement before the new floor can go on, and that reinforcement is part of the price. Contractors unfamiliar with the HVHZ pathway get stop-work orders; we run the HVHZ review from the first plan submittal. Call (877) 610-1318 for a quote that accounts for this from the start.
Usually not, but each building is different. Sunny Isles Beach condominium towers are governed by their HOA documents and the city’s zoning, and most tower HOAs restrict secondary dwelling uses inside the main envelope. In many cases, a Junior ADU conversion inside a condo tower will require an HOA board approval and a zoning review that is not guaranteed. We review the HOA documents and the city code together before you spend any money on design, and we’ll tell you straight if it won’t pass. Call (877) 610-1318 and we’ll look at your specific building.
Because the slab is embedded in sand that sits between two saltwater bodies, and salt spray and groundwater both reach the anchor points even under tile. Zinc-plated anchors corrode within a season or two on this island, and the rust travels through the slab and stains whatever is on top. We spec stainless or epoxy-coated anchors for ADU tie-downs, on every job, because on Sunny Isles Beach there’s no such thing as “far enough from the water.” That cost is in our written line-item quote, not a surprise at the end.
Sunny Isles Beach follows the county noise ordinance, which generally restricts construction noise to weekday daytime hours and often prohibits it entirely on Sundays and holidays, but your specific building or HOA may impose tighter quiet hours. We post party-wall notices during HOA quiet hours and run our crews on the building’s posted work schedule, and the same rules apply on a shared-wall lot off Collins Avenue. If your HOA has stricter rules than the city, we follow the stricter one. Call (877) 610-1318 and we’ll pull the exact schedule for your building.
Contact Barrett & Sons Construction for Your Sunny Isles Beach Addition or ADU
If you live in Sunny Isles Beach and you’re thinking about an ADU, a garage conversion, or a second-story addition, call us at (877) 610-1318 and schedule a free estimate. We’ll walk the site, check the access, the staging, the water table, and the HOA rules, and then we’ll hand you a written line-item scope with real numbers. Tom Barrett’s name, address, and license number are published for you to verify before you sign anything. And the 90-Day Done Right Promise is in writing too.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Sunny Isles Beach since 1998.