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 Aventura
Home additions and ADU work in Aventura runs from about $45,000 for a junior ADU conversion inside an existing unit to $130,000 for a full room addition, with garage conversions landing between $30,000 and $80,000 depending on the building’s structural rules. The number that matters most to you is the one written on your contract before we start, not the one a national company gives you over the phone. We’ve worked in enough Aventura towers to know that a quote that ignores your HOA’s work windows, loading dock schedules, and SB 4-D milestone inspection status isn’t a quote at all. It’s a guess. Call (877) 610-1318 and we’ll give you a real number, in writing.
Why Barrett & Sons Construction Is Aventura’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998, and his sons run the crews. That’s not a marketing line. When our team shows up at your Aventura building, the name on the truck is the same name that answers the phone. We carry the same premium materials across every project, whether we’re framing a junior ADU out of a den at 3400 NE 192nd Street or building a detached unit on a rare single-family lot off West Dixie Highway.
Aventura customers call us because we understand what it takes to work inside a condominium tower. We know the buildings, the boards, and the building departments. Every permit gets pulled. Every change order arrives in writing before any scope changes. And every job carries our 90-Day Done Right Promise: if it’s not done right, Tom comes back and makes it right, one call. Look up the license number yourself if you want. We publish it because the last contractor most Aventura owners used told them permits were optional.
Our team has completed dozens of interior conversions, room additions, and ADU designs in Aventura’s high-rise and mid-rise buildings. We don’t send strangers. The crew members on your job carry the Barrett & Sons name, they’re background-checked, and they arrive in uniform. A live person answers our phone 24/7, not a voicemail box in another state.
Our Home Additions & ADU Services in Aventura
ADU Design & Permitting
Designing an ADU in Aventura is different from designing one in Hallandale Beach or North Miami Beach. Your building’s original construction drawings may not exist, your unit may tie into a post-tension slab with no as-built documentation, and your permit may sit behind a building-wide milestone inspection. We handle the architectural drawings, the structural engineer’s letter when the city asks for one, and the permit package from first submittal to final sign-off. The permit inspector works for you, not for me. That’s why I like him.
Garage Conversion ADU
Garage conversions in Aventura’s older buildings are rare but they do exist, and they come with a specific set of problems. Tight lot access, shared walls, and loading dock restrictions dictate how we stage materials and what we can bring in on a pallet. A typical garage conversion in Aventura runs $30,000 to $80,000, and the price almost always includes a line-item for HOA coordination and crane time if the building requires it. We plan for that from the first walkthrough.
New Detached ADU
Detached ADUs on a constrained Aventura lot mean getting creative with access. The city has very few single-family parcels, so when we build a detached unit, we’re usually working within a zero-lot-line setback, a narrow driveway, or a shared wall situation. We handle site prep, utilities, and the structural work, and we keep the site clean enough that your neighbors don’t start collecting signatures for a complaint. Quotes for a detached ADU in Aventura typically land in the $45,000 to $130,000 range for a standard build-out, and higher for complex site work.
Junior ADU & Interior Conversion
This is the work we do most often in Aventura. A junior ADU takes an existing space, usually a den, a large bedroom, or a closed-off living area, and turns it into a self-contained living unit with a kitchenette, full bath, and its own entrance where the building allows it. In Aventura’s 1970s and 1980s towers, we’ve converted dens at the 3400 building while the building’s SB 4-D milestone inspection was underway. We had to stage materials on the shared loading dock, schedule crane time through the HOA, and submit our rough-in for inspection sign-off before the building’s concrete remediation crew could start in the adjacent unit. That’s the reality of working in Aventura, and it’s why our junior ADU and interior conversion quotes include a line for HOA coordination. The range runs $45,000 to $130,000 depending on plumbing rough-ins and finishes.
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 Aventura
We install materials you can look up, not mystery brands off a van. On Aventura jobs, that means Techo-Bloc pavers for any site work or exterior access pads, Cambridge Pavers when the board’s design guidelines call for a specific color match, and Quikrete products for structural repairs and setting work. We stock common materials locally and pull specialty items from our South Florida suppliers, which keeps turnaround reasonable even when a building’s loading dock only gives us a two-hour window on a Tuesday.
Common Home Additions & ADU Problems We See in Aventura Homes
- HOA work-hour windows that don’t match the job. Aventura boards often restrict construction to 9 to 4 on weekdays, and some ban work entirely during snowbird season. We’ve seen crews get stop-work orders because nobody read the building’s rules before drywall arrived on a pallet. We read the rules before we write the quote.
- Load-bearing walls tied into post-tension slabs. In Aventura’s older concrete towers, a wall you thought was partition can tie into the slab in ways the original drawings never documented. That triggers a structural engineer’s letter before the city will clear your permit. We know how to check for this early, and we tell you when it’s coming.
- Milestone inspection scope entanglement. The building at 3400 NE 192nd Street, like most 30-plus-year-old Aventura towers within 3 miles of the coast, has a building-wide SB 4-D structural inspection on file. If the common-area concrete remediation gets flagged while we’re pulling your unit-level permit, the city may hold the permit until the scopes reconcile. We coordinate with the board and the city so your job doesn’t die in review.
- Shared loading dock and crane scheduling. On a tight Aventura lot, there’s no room for a 40-yard dumpster and a material staging area. You get a dock slot, and if you miss it, you wait a week and pay a change order for overtime. We’ve managed dock windows at multiple towers and we schedule around them, not through them.
Pricing for Home Additions & ADU in Aventura, FL
Here’s what we quote in Aventura, based on the jobs we’ve completed in the city’s condo towers and the rare single-family lots that remain. These ranges include materials, labor, permits where applicable, and our written change-order process. A junior ADU or interior conversion runs $45,000 to $130,000. Room additions run the same range. Garage conversion ADUs run $30,000 to $80,000. The cost drivers specific to Aventura: HOA work-hour restrictions that slow production, crane and dock fees the building charges, an engineer’s letter when a wall ties into a post-tension slab, and Miami-Dade HVHZ product requirements that limit window and door choices and add lead time. You’ll get every allowance in writing before we start, and every price change as a signed change order before the work happens. Call (877) 610-1318 for a free estimate, and we’ll line-item it so you see exactly where the money goes.
| Sub-Service | Typical Aventura Range |
|---|---|
| Junior ADU & Interior Conversion | $45,000 - $130,000 |
| Room Additions | $45,000 - $130,000 |
| Garage Conversion ADU | $30,000 - $80,000 |
We Also Serve Cities Near Aventura
Our crews serve the whole northeast Miami-Dade corridor. That includes North Miami Beach, Ojus, Sunny Isles Beach, and Hallandale Beach. If your building is on the Aventura line and you’re not sure whether we cover it, call (877) 610-1318 and ask. You’ll get a person, not a recording. Aventura is home base for this page, and we’re here most days.
Serving Aventura, FL - Our Local Coverage Area
We’re based in the Aventura 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 Aventura
Yes, and you need it before we pull a permit. Aventura condominium boards govern interior structural changes, plumbing relocations, and any work that touches a shared wall, floor, or ceiling. Even a den conversion into a junior ADU typically requires board approval, an alteration agreement, and often a licensed engineer’s drawing. We submit the package to your board and the city at the same time, and we don’t start until both are signed. Call (877) 610-1318 and we’ll walk you through the specific board requirements for your building.
If your building is 30 years or older and within 3 miles of the coast, which covers virtually every major tower in Aventura, the building has a milestone structural inspection on record. The city will sometimes hold a unit-level permit until the common-area scope of work from that inspection is reconciled. We see this regularly. The fix is coordination: we submit your unit permit, we talk to the building’s engineer about the common-area scope, and we make sure the city has both documents in the same file. That’s why our Aventura quotes include a line for milestone inspection coordination when the building requires it.
In many Aventura buildings, yes. The den needs enough square footage for a sleeping area and a kitchenette, the building’s plumbing design needs to support a full bath rough-in, and the board needs to approve the alteration. We’ve framed junior ADUs inside 1980s Aventura towers, including the building at 3400 NE 192nd Street, while the building’s own concrete remediation was underway. It takes closer coordination with the HOA than a standard remodel, but it’s done regularly. The range is $45,000 to $130,000. Call (877) 610-1318 for an exact scope and quote.
The access is what most people underestimate. Aventura’s buildings and the few single-family lots remaining don’t give you room for a large staging area, so materials go in and out on a schedule controlled by the loading dock or the driveway width. Add HOA work-hour restrictions, crane time if the building requires it, and potentially a structural engineer’s review if the garage shares a wall or slab with another unit. Those items together can add $10,000 to $20,000 to a garage conversion compared to a similar job in a single-family city like North Miami Beach. We put every one of those items in writing before we start.
Because someone has to do it, and it’s real work. The HOA coordination line covers the time we spend reading your building’s alteration rules, submitting drawings to the board, scheduling dock and crane windows, coordinating with the building’s own engineer if a milestone inspection is active, and dealing with any stop-work or noise complaint that comes up mid-job. In Aventura, that line is not optional. Contractors who skip it either eat the time or surprise you with a bill at the end. Ours is written into the quote, up front. Call (877) 610-1318 and we’ll explain exactly what it covers for your building.
Contact Barrett & Sons Construction
If you’re planning a home addition, ADU, garage conversion, or junior ADU in Aventura, call us at (877) 610-1318 and ask for a free estimate. We’ll come out, look at the space, read the board’s rules if we haven’t already, and give you a written scope with a line-item price. No allowances that aren’t on paper. No price changes that don’t arrive as a signed change order. Just a straight answer from a company that’s been doing this since 1998, with Tom Barrett’s name on the truck and his sons running the crew.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Aventura since 1998.