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 Fountainebleau
A home addition or ADU in Fountainebleau typically runs between $45,000 and $130,000 for most room additions, while a full detached ADU runs $90,000-$220,000 depending on size, foundation work, and finishes. Those are real, market-calibrated numbers for 33172, not national averages. If you’re thinking about adding square footage or building an accessory unit in Fountainebleau, call (877) 610-1318 and we’ll walk the property with you, tape measure in hand, and put a written scope and price in front of you before you commit to anything.
We’ve worked this stretch of unincorporated Miami-Dade long enough to know what happens when someone builds here without respecting the ground, the wind code, and the county permit process. The houses look simple from the street. They’re not. We’ll explain what we mean below.
Why Barrett & Sons Construction Is Fountainebleau’s Preferred Home Additions & ADU Company
Tom Barrett started this company in 1998, and his sons run the crews today. When you call about a Home Additions & ADU project in Fountainebleau, you’re not getting a sales rep in another state routing a stranger to your door. You’re getting the Barrett family, and the same faces show up from first meeting to final inspection.
Every job we do in Fountainebleau includes permits pulled and inspections signed. That sentence matters more here than almost anywhere else, and it’s one reason homeowners in 33172 call us after another contractor told them permits were optional. They’re not optional in this zip code. The county inspector works for you, not for me. That’s why I like him.
We publish our license number, our office address in the Miami/South FL area, and Tom’s name. Look us up before you sign anything. And if something isn’t done right after we leave, the 90-Day Done Right Promise is written on every contract. One call brings Tom back. That’s the whole promise.
Our Home Additions & ADU Services in Fountainebleau
ADU Design & Permitting
Designing an ADU in Fountainebleau starts with the Miami-Dade County Building Department, not a napkin sketch. Every plan must meet High-Velocity Hurricane Zone standards and carry Miami-Dade Notice of Acceptance documentation for materials. We handle drawings, county submittal, and the back-and-forth that makes unincorporated Miami-Dade permits their own animal. Most homeowners get lost in that process and stall out. That’s exactly where we step in.
Garage Conversion ADU
A garage conversion in Fountainebleau usually lands between $30,000 and $80,000 depending on whether we’re working with the existing CBS shell, replacing the slab, or re-framing the opening. The 1960s-1980s concrete block garages in this area are solid, but most were never built with habitable space in mind: no proper tie-downs, no hurricane-rated garage door framing, and slab elevations that fight the water table. We address all three before finish work starts.
New Detached ADU
A new detached ADU in Fountainebleau runs $90,000-$220,000, and the spread comes down to square footage, soil prep, and how close the water table sits on your parcel. Much of 33172 sits on oolitic Miami Limestone with groundwater within 2-4 feet of grade, so during the June-October wet season we plan dewatering into the footing and slab schedule. Skip that step and you’re pouring concrete into a bathtub. We don’t skip steps.
Junior ADU & Interior Conversion
Sometimes the smartest addition in Fountainebleau is already under your roof. Converting a bonus room, enclosed garage bay, or oversized laundry into a junior ADU with its own entrance, kitchenette, and bath can run $45,000-$90,000 depending on plumbing access and egress. These projects move faster than ground-up builds because the shell already exists. If you’re weighing a conversion against a detached build, we’ll price both honestly and let you decide.
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 Fountainebleau
When we set windows, doors, and waterproofing on a Fountainebleau addition, we’re not pulling mystery brands off the van. We install Andersen and Marvin windows, GAF roofing on any new roofline we tie into, and Schluter waterproofing systems in ADU baths and kitchens. These are materials you can look up. If a product doesn’t carry a Miami-Dade NOA, it doesn’t go on a job in this zip code. We stock common sizes for local projects, which keeps turnaround tight when the county approves your plans.
Common Home Additions & ADU Problems We See in Fountainebleau Homes
- Wind code surprises on tie-ins. Homes built before Andrew in the 1960s-1980s rarely have modern hurricane strapping. When a new addition ties into an existing CBS wall or roofline, the inspector will require the connection to meet current HVHZ standards, which often means opening up the old wall and retrofitting. We build that into the scope up front, in writing.
- Flat and low-slope roofs that can’t be overlaid. Much of the 33172 housing stock carries aging flat or low-slope roofs. Adding onto a home with that roof condition usually means full tearoff and code-compliant replacement, not a cheap overlay. We’ll tell you that on the first visit, not after demolition starts.
- Groundwater in the footing trench. The oolitic limestone under Fountainebleau holds water close to the surface. During wet season, a footing excavation can fill overnight. Dewatering and proper vapor barriers are standard on our jobs here, and if a bid doesn’t include them, it’s a bid that will grow.
- Single-pane windows and original framing. Most original windows in this area are single-pane aluminum frames that don’t come close to current impact or energy code. Any addition that triggers a permit will trigger window upgrades where the new space meets the old. We plan for that line item upfront.
Pricing for Home Additions & ADU in Fountainebleau, FL
Here are the numbers we quote most often in 33172. A room addition runs $45,000-$130,000. A garage conversion ADU runs $30,000-$80,000. A new detached ADU runs $90,000-$220,000. A junior ADU or interior conversion runs $45,000-$90,000. What moves the price? Square footage, foundation work, roof condition, waterproofing requirements, and whether your existing home needs retrofit work to meet current wind code.
Every scope, every allowance, every price change arrives as a written change order before work happens. No surprise invoices at the end. An allowance that isn’t on paper is a surprise waiting for a date. Call (877) 610-1318 for a free estimate. We’ll walk the property, measure, and hand you a written line-item quote. You compare it against anyone else’s. Then you decide.
We Also Serve Cities Near Fountainebleau
Beyond our Fountainebleau work, the crew regularly handles additions and ADUs in Sweetwater, University Park, Olympia Heights, and Westwood Lake. If you’re in one of those neighborhoods and wondering whether we cover your block, the answer is yes. And if you’re planning a kitchen or bath alongside the addition, see our Kitchen Remodeling in Fountainebleau and Bathroom Remodeling in Fountainebleau pages for pricing that matches the rest of your project.
Serving Fountainebleau, FL - Our Local Coverage Area
We’re based in the Fountainebleau 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 Fountainebleau
Design and county permit review in unincorporated Miami-Dade typically takes 6-14 weeks before construction starts, depending on plan complexity and current county workload. We handle the submittal so you’re not chasing the Building Department yourself. Call (877) 610-1318 to get your design and permitting timeline mapped out for your specific parcel.
Yes. We work the full 33172 zip code, from the older CBS homes near the Tamiami Trail corridor to the two-story split-levels further west. Scheduling and dispatch are coordinated from our Miami/South FL area office, and our crews serve Fountainebleau locally. If you’re inside 33172, you’re in our service area.
It means every window, door, fastener, and roof assembly on your addition must carry a Miami-Dade Notice of Acceptance, and the county inspector will check. Products approved even one county north in Broward may not pass here. We only install NOA-listed materials on Fountainebleau jobs, so your permit sign-off doesn’t stall over a product sheet.
The water table, the wind code, and the county permitting process all add cost here. Footing dewatering during wet season, retrofitting existing 1960s-1980s structures to meet current tie-down standards, and county-level inspection scheduling make 33172 work more involved than a simple build on high ground elsewhere. Our written quotes include those items. If another bid doesn’t, that’s the bill coming later.
Every job carries the written 90-Day Done Right Promise. If something isn’t done right, one call brings Tom Barrett back to make it right. It’s on every contract, not buried in fine print. Call (877) 610-1318 for your free estimate and a written quote.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Fountainebleau and the surrounding communities since 1998.