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 Tamiami
Adding square footage to a home in Tamiami, FL is a different animal than adding it in most of Miami-Dade. A home addition in Tamiami typically runs $53,100-$153,400, while a full ADU construction falls between $106,200 and $259,600. Those numbers reflect something real: the limestone caprock and high water table that run under most of the 33184 ZIP code. Barrett & Sons Construction has been navigating those conditions since 1998, and we price every job so you know exactly what you’re getting before a shovel breaks ground. Call (877) 610-1318 to schedule a free estimate.
Key Takeaways:
- Home additions in Tamiami run $53,100-$153,400; ADU construction lands between $106,200-$259,600.
- Every Tamiami addition on a pre-1992 home must address HVHZ code upgrades to roof clips, sheathing, and window openings before framing passes inspection.
- The water table here sits 12-18 inches below grade. Dewatering pumps and pneumatic chipping aren’t optional, they’re part of the scope.
- Barrett & Sons writes every allowance and change order on paper before work proceeds. No surprises at the end.
Why Barrett & Sons Construction Is Tamiami’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998, and his sons run the crews. That’s not marketing language; it’s how we operate. When you call about a second-story addition near the Tamiami Canal or a detached ADU off SW 8th Street, the person answering the phone is part of the Barrett family or a crew member who carries the Barrett & Sons name. Our Home Additions & ADU team has opened enough 1970s CBS walls in Tamiami to know exactly what’s waiting behind the drywall: corroded hurricane clips, undersized trusses, wiring that predates current code, and waterproofing that gave up years ago. We scope for that reality from the first walkthrough.
What separates us from the national outfits isn’t a slogan. It’s this: every scope change arrives as a written change order before a nail moves. The permit inspector works for you, not for us, and we like it that way. Tom Barrett publishes his name, his address, and his license number. Look it up before you sign anything. We’ve built our reputation in Tamiami one job at a time, and a live person answers our phone 24 hours a day, seven days a week.
Our Home Additions & ADU Services in Tamiami
We build additions and ADUs that fit the way people actually live in Tamiami. That means floor plans that respect the lot lines, elevations that work with the water table, and permits that pass Miami-Dade’s HVHZ review the first time. Here’s how we approach the four most common projects in the 33184 ZIP code:
ADU Design & Permitting
Every detached ADU in Tamiami starts with the same question: what does the lot actually support? We handle the full design and permitting package, including engineered drawings stamped for Miami-Dade County. On a typical Tamiami lot, that means designing footings that won’t float, specifying wind-rated assemblies that satisfy HVHZ, and pulling the permit package ourselves so you don’t sit on a county review desk for months. No change order appears without your signature on paper first.
Garage Conversion ADU
Garage conversions in Tamiami run $35,400-$94,400, and they’re one of the most cost-effective ways to add a rental unit or in-law suite. But there’s a catch most people don’t see coming: the floor slab in a 1980s CBS garage is usually below the flood elevation that current code requires for habitable space. We raise the finished floor, install proper moisture barriers, and upgrade the electrical and plumbing rough-in before any drywall goes up. The county’s third-party inspector signs off on the corrected work, not just the final product.
New Detached ADU
Building a detached ADU in Tamiami means starting from scratch on soil that fights you. We bring dewatering pumps to the site before we dig the footing, because the limestone caprock under Tamiami holds the Biscayne Aquifer like a lid. Once you breach it, groundwater rises fast enough to undercut fresh concrete. Our crews chip through the oolitic limestone with pneumatic tools, set the forms, and pour only after the water’s been managed. ADU construction on these lots runs $106,200-$259,600, and the site prep is a big reason why. You’ll see that line item on your estimate in writing.
Junior ADU & Interior Conversion
Some Tamiami homeowners don’t need a separate structure. They need a kitchenette, a private entrance, and a legal second unit inside the existing footprint. Junior ADUs and interior conversions are our most straightforward path to rental income or multigenerational living. We handle the fire separation, the sound attenuation, the independent egress, and the plumbing and electrical work that separate a permitted ADU from a glorified bedroom. Prices vary by scope, but we give you a written line-item estimate up front, and the allowance sheet stays in the contract where you can see it.
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 Tamiami
We don’t install mystery materials off a van. On Tamiami additions and ADUs, you’ll see names like Andersen for windows, GAF for roofing, and Belgard or Techo-Bloc where hardscape ties into the new footprint. When your plan calls for a patio or walkway connecting the main house to a new ADU, Techo-Bloc’s permeable pavers handle Tamiami’s wet-season sheet flow better than solid concrete. We stock the materials locally and we schedule deliveries around the weather, because the June-to-October rains don’t care about your framing schedule. You can look up every brand we install before you sign the contract.
Common Home Additions & ADU Problems We See in Tamiami Homes
Most of the homes in Tamiami were built between 1970 and 1990, before Hurricane Andrew rewrote the building code. That means a simple room addition can turn into a structural upgrade project the moment we open a wall. Here’s what we run into most often:
- Excavating without a dewatering plan. On a footing dig near the Tamiami Canal, groundwater breached the limestone cap within two hours. If the pump isn’t on site before the bucket goes in, the pour gets ruined and the schedule slips.
- Pre-Andrew hurricane clips and trusses. We opened a load-bearing wall on a 1980s CBS home for a second-story addition and found corroded clips and undersized trusses. We wrote a revised scope with allowances for HVHZ-rated hardware, then paused framing until the county third-party inspection cleared the rough-in.
- Wiring and plumbing that fails current code. Open a 1970s CBS wall in Tamiami and you’ll often find cloth-insulated wiring or a water line that’s seen better days. The project doesn’t move forward until the electrical rough-in is corrected and re-inspected. That’s not our rule, it’s Miami-Dade’s, and we write the allowance for it into the original contract.
- Non-HVHZ window and door openings. Bid an addition using standard openings and the permit gets rejected. Tamiami sits in the High-Velocity Hurricane Zone, which means every new opening needs wind-rated assemblies and third-party special inspections. Contractors from outside the county routinely miss this and then hand you a surprise bill. We don’t.
Pricing for Home Additions & ADU in Tamiami, FL
Here’s the honest math for Tamiami’s market. These ranges reflect what we see across the 33184 ZIP code, factoring in the limestone excavation, dewatering, and HVHZ compliance that every project here needs.
| Project Type | Typical Range in Tamiami |
|---|---|
| Home Addition | $53,100-$153,400 |
| ADU Construction | $106,200-$259,600 |
| Garage Conversion ADU | $35,400-$94,400 |
| Second Story Additions | $53,100-$153,400 |
| Room Additions | $53,100-$153,400 |
What moves the number inside that range? The condition of the existing slab, whether the lot needs fill or dewatering, the number of window and door openings that must be upgraded to wind-rated assemblies, and whether the electrical panel can handle the new load or must be replaced. We show you all of it in a written line-item estimate. Call (877) 610-1318 and we’ll come out, walk the property, and hand you a number you can actually check against other bids. The estimate is free.
We Also Serve Cities Near Tamiami
Beyond Tamiami, our crews work throughout the surrounding communities, including Sweetwater, University Park, Fountainebleau, and Olympia Heights. If you’re a few miles east or south, the same team that handles Home Additions & ADU in Tamiami can come to you. Call (877) 610-1318 and ask for a free estimate.
Serving Tamiami, FL - Our Local Coverage Area
We’re based in the Tamiami 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 Tamiami
Because the water table sits 12-18 inches below grade across most of Tamiami, and the oolitic limestone caprock that makes drilling slow also acts as a cap on the Biscayne Aquifer. Once you breach that cap, groundwater rises fast enough to undercut fresh concrete if the crew isn’t ready. A dewatering pump must be on site before the bucket goes in. Call (877) 610-1318 for a walkthrough and a written scope that includes site prep costs up front.
We stop, photograph everything, and write a revised scope of work with new allowances for the corrected rough-in, waterproofing, and any structural repairs. You approve that change order in writing before we buy materials or do the work. On homes built before Hurricane Andrew, it’s almost guaranteed the original waterproofing and wiring will fail current Miami-Dade inspection. Planning for that in the initial contract is how we avoid surprise invoices at the end. Call (877) 610-1318 to talk through your existing home’s likely conditions.
You need engineered drawings stamped for Miami-Dade County, and we handle that in-house as part of our ADU Design & Permitting service. The engineering package covers the wind-rated assemblies, the foundation design for the limestone and water table conditions, and the site plan that satisfies the county’s setback and flood requirements. We submit the permit package and manage the third-party inspections through final sign-off. Call (877) 610-1318 and we’ll walk you through the process and the timeline.
Because Miami-Dade’s High-Velocity Hurricane Zone code applies to the entire structure once you open it up, and homes built before 1992 were framed to a weaker wind standard. When we opened a load-bearing wall on a 1980s CBS home near the Tamiami Canal for a second-story addition, we found corroded hurricane clips and undersized trusses. The permit couldn’t proceed until we upgraded the clips and roof sheathing fasteners to HVHZ ratings and passed a third-party inspection. We budget for that in the original scope, not as a surprise later.
No. A garage slab in a 1980s CBS home typically sits below the flood elevation that current code requires for habitable space, which means the finished floor must be raised, the slab must get a proper moisture barrier, and the plumbing and electrical rough-in must be brought to current code. We handle the full conversion, including the elevation work, and we write every dollar of it into the contract before we start. Call (877) 610-1318 for a garage conversion estimate specific to your home in Tamiami.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Tamiami, FL. Call (877) 610-1318 to schedule your free estimate.