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 The Hammocks
A home addition or ADU in The Hammocks typically runs $45,000 to $130,000 for a full build, and the path from idea to occupancy hinges on one thing most homeowners don’t know to ask about: Miami-Dade Notice of Acceptance compliance. Barrett & Sons Construction has been building and remodeling in southwest Miami-Dade since 1998, and we’ve pulled permits on enough The Hammocks jobs to know which products pass the HVHZ inspection and which ones get red-tagged at final. If you’re planning a garage conversion, second-story addition, or detached ADU in The Hammocks, call (877) 610-1318 and we’ll walk the property with you before you spend a dollar on plans.
Why Barrett & Sons Construction Is The Hammocks’s Preferred Home Additions & ADU Company
We’re the owner-operated crew that The Hammocks homeowners call after they’ve been burned by a company that quoted one number and handed them another. Tom Barrett founded this company in 1998, and his sons run the crews. When we give you a scope of work, every allowance and every price change comes as a written change order before a single nail moves. That matters in The Hammocks, where HOA architectural review boards and Miami-Dade inspectors can force scope changes mid-project if the original plans weren’t spec’d correctly.
Our standing policy is simple: permits pulled and inspections signed on every eligible job, written change orders on every scope shift, and the 90-Day Done Right Promise on every contract. If something isn’t right, one call brings Tom back. The Hammocks homeowners deal with enough surprises from the Florida weather. Their contractor shouldn’t be one of them.
We answer our own phone. No out-of-state call center. When you call Barrett & Sons, you get a live person who knows what a CBS home off SW 157th Avenue looks like and what the HOA will want to see on your ADU submittal. That local knowledge is the difference between a permit set that passes and one that gets kicked back by the architectural review board.
Our Home Additions & ADU Services in The Hammocks
ADU Design & Permitting
In The Hammocks, ADU design starts with the Miami-Dade NOA list, not with a sketch. Every window, exterior door, roofing fastener, and underlayment must carry a Miami-Dade Notice of Acceptance, or the inspector fails the job. We handle the design, the architectural review board pre-application, and the permit submittal as one package, so you don’t end up with a plan set the HOA rejects and the county can’t approve. A full ADU in The Hammocks, designed and permitted, runs $90,000 to $220,000 depending on size and finish.
Garage Conversion ADU
A garage conversion in The Hammocks is the most cost-effective way to add a rental unit or in-law suite, but it’s also the easiest job to get red-tagged. The existing garage slab often sits below the flood elevation the county wants for habitable space, and the new impact-rated windows and exterior door have to carry Miami-Dade NOAs. We scope the conversion correctly from day one, including any slab raising, door replacement, and electrical service work. Expect $30,000 to $80,000 for a finished attached ADU in The Hammocks.
New Detached ADU
Building a new detached ADU in The Hammocks means excavating on the oolitic limestone plain where the water table can sit 12 to 18 inches below grade. That’s not a problem if the engineer specifies dewatering and engineered fill from the start. It’s a disaster if the crew hits water mid-trench and the slab floats. We’ve done enough additions off SW 157th Avenue and through the 33196 zip code to plan for that before the first shovel goes in. Detached ADUs run $90,000 to $220,000 in The Hammocks depending on square footage and utility runs.
Junior ADU & Interior Conversion
If your The Hammocks home has an interior space you can convert, a junior ADU is often the fastest path to a legal rental or a private suite for family. Interior conversions typically don’t trigger the same exterior envelope review as a garage conversion, but they still require egress windows, separate kitchenette or wet bar plumbing, and the right permits. We’ll tell you honestly whether your layout supports a JADU or whether you’d be better off adding square footage. Call us at (877) 610-1318 and we’ll look at what you have.
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 The Hammocks
We install materials we can name, because a homeowner in The Hammocks should be able to look up what’s going on their house. On addition and ADU projects, we spec PGT and CGI impact-rated windows and doors, both of which carry Miami-Dade NOAs across their product lines. For sunroom and enclosed patio additions, we work with Simonton engineered openings that will pass the HVHZ review the county requires. These are brands The Hammocks homeowners recognize and can verify, not mystery materials off a van.
Common Home Additions & ADU Problems We See in The Hammocks Homes
- Non-NOA products on the submittal. Contractors who mainly work in Broward or Palm Beach County routinely spec windows and doors that are legal everywhere else in Florida but fail Miami-Dade inspection. We catch those before they get ordered.
- HOA rejection on ADU design. The Hammocks HOA architectural review board wants additions and ADUs to keep the stucco and barrel-tile streetscape. An owner who skips pre-application can spend $4,000 on a permit set the board rejects on page one.
- Water table surprises during excavation. The water table in The Hammocks sits 12 to 18 inches below grade. A crew that doesn’t plan for dewatering and engineered fill ends up with a floating slab that cracks and fails inspection sign-off.
- Pre-Andrew structural gaps. Homes in The Hammocks built before 1994 often lack high-wind roof decking and load-path strapping. A second-story addition forces the issue, and the right fix is a structural upgrade to the existing first-floor shell before framing begins.
Pricing for Home Additions & ADU in The Hammocks, FL
Here’s what we’re seeing in The Hammocks right now. These are real numbers, not drive-by estimates.
| Project | Price Range in The Hammocks |
|---|---|
| ADU Construction | $90,000 - $220,000 |
| Garage Conversion | $30,000 - $80,000 |
| Home Addition | $45,000 - $130,000 |
| Impact Window Installation | $8,000 - $25,000 |
| Roof Replacement | $8,000 - $20,000 |
What pushes a The Hammocks addition toward the top of the range: second-story structural retrofitting on a pre-Andrew shell, new utility runs across a lot with a high water table, and HOA-required finishes like barrel tile or specific stucco profiles. What keeps it lower: a simple garage conversion with existing slab reuse and minimal envelope changes. Every estimate we write includes a line-item breakdown, and the price won’t move unless a written change order says it does. Call (877) 610-1318 for a free estimate on your The Hammocks project.
We Also Serve Cities Near The Hammocks
Our crews work throughout southwest Miami-Dade. Beyond The Hammocks, Home Additions & ADU in The Hammocks clients regularly come from Country Walk, The Crossings, Three Lakes, and Kendall West. If you’re in Miami-Dade with a home addition or ADU in mind, you get the same written change orders and the same 90-Day Done Right Promise from our Home Additions & ADU team regardless of which zip code you’re in.
Serving The Hammocks, FL - Our Local Coverage Area
We’re based in the The Hammocks 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 The Hammocks
Almost certainly yes. A 1993 CBS home in The Hammocks predates the full post-Andrew HVHZ nail-pattern and load-path requirements, and any second-story addition or roofline tie-in will trigger a structural review that flags the existing roof deck and strapping. Expect the addition scope to include a structural upgrade to the existing load-bearing walls and roof tie-downs before new framing starts. That’s not contractor padding; it’s what the Miami-Dade inspector will require. Call (877) 610-1318 and we’ll tell you exactly what your 1993 shell needs before you commit to plans.
You need HOA approval first, and you need a contractor who understands Miami-Dade’s NOA requirements for the new impact-rated windows and exterior door. Builder warranties on the original shell are likely expired at this point for most The Hammocks homes, but the HOA’s architectural review board is still active, and they will reject conversions that alter the stucco and barrel-tile streetscape. We handle the pre-application and design review as part of the permitting package. A garage conversion in The Hammocks runs $30,000 to $80,000.
A Miami-Dade Notice of Acceptance is a product approval that supersedes Florida statewide approvals. Every window and exterior door on a detached ADU in The Hammocks must come from the NOA list, or the final inspection fails and you’re replacing brand-new products at your own cost. We spec PGT and CGI impact-rated openings on every ADU we build in The Hammocks. Both manufacturers carry Miami-Dade NOAs across their lines, so the inspector signs off on the first visit, not the third.
Because the water table in The Hammocks sits 12 to 18 inches below grade across much of the community, so any excavation for footers, utility runs, or drainage hits standing water fast. That means dewatering and engineered fill, which add real cost to a paver patio, sunroom foundation, or detached ADU slab. A crew that doesn’t plan for it quotes a low number, then hands you a change order mid-dig. We plan for it from the first site walk. A sunroom or enclosed patio addition in The Hammocks typically runs $45,000 to $130,000 depending on size and foundation work.
It won’t trigger a full retrofit, but it will trigger a structural review of the load path from the new second story down through the existing first-floor walls to the foundation. On a mid-1990s CBS home in The Hammocks, that review often requires upgrading the existing tie beams, adding high-wind sheathing on the roof deck, and replacing any non-conforming fasteners before the new trusses go up. We recently framed a second-story addition off SW 157th Avenue on a 1994 CBS home. The existing roof deck had the old H-clip spacing and no high-wind underlayment, so our scope included a structural upgrade to the load-bearing tie beams before we could set the new trusses. Our rough-in passed the Miami-Dade inspector on the first visit because we specified only NOA-listed fasteners and sheathing from the initial submittal, avoiding a change order that would have stalled the draw schedule.
If you’re planning a home addition or ADU in The Hammocks, call Barrett & Sons Construction at (877) 610-1318. We’ll walk your property, talk through what the HOA and the county will actually require, and hand you a written estimate with real numbers and a clear scope. Free estimates, written change orders, and the 90-Day Done Right Promise on every job.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving The Hammocks and southwest Miami-Dade since 1998.