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 Plantation
Adding square footage to a Plantation home usually lands between $45,000 and $130,000 for a room addition, $30,000 to $80,000 for a garage conversion ADU, and $90,000 to $220,000 for a new detached ADU. Those are real numbers from the bids we write in Plantation neighborhoods every month. The bigger variable here is not what you want to build. It is what Broward County’s 50% substantial-improvement rule will trigger on the existing 1960s CBS house before your new square footage gets approved. Call Tom Barrett and his sons at (877) 610-1318 for a free estimate. We will walk the property with you, read the existing wall construction, and tell you what the permit reviewer will ask for before you spend a dollar on plans.
Key Takeaways for Plantation Homeowners
- Room additions in Plantation run $45,000-$130,000; garage conversion ADUs run $30,000-$80,000; new detached ADUs run $90,000-$220,000.
- Permitted additions on older CBS ranch homes often trigger mandatory structural remediation: single-wythe block walls with unfilled cores fail current Florida Building Code wind-load calculations.
- Broward County’s 50% substantial-improvement rule can force impact windows, roof-to-wall connections, and hurricane strapping onto your existing house when a project crosses that threshold.
- Every Barrett & Sons job carries the written 90-Day Done Right Promise, and every price change arrives as a written change order before work proceeds.
Why Barrett & Sons Construction Is Plantation’s Preferred Home Additions & ADU Company
We have been called out to Plantation enough times to know the difference between the neighborhoods: the shaded streets of Country Club Estates, the HOA-governed sections east of University Drive, the 1960s CBS ranches off Broward Boulevard. That familiarity matters on Home Additions & ADU work, because the house you are adding onto is not a blank slate. It is a 50-to-60-year-old concrete block structure that was built before Hurricane Andrew rewrote the Florida Building Code. When our crew opens an exterior wall for a room addition in your neighborhood, we already know what we are likely to find. That is why Plantation homeowners call us: the estimate we give on day one reflects what Plantation’s existing homes actually cost to bring into compliance, not a generic number from a national call center.
Tom Barrett founded the company in 1998, and his sons run the crews. A live person answers the phone 24 hours a day, 7 days a week, not a voicemail box. We publish Tom’s name, license number, and address. The permit inspector works for you, not for us, and we like having him on every eligible job. Every scope, every allowance, every change arrives as a written change order before a single nail moves. That is how we have kept the name on the truck worth something for 29 years. No franchise sends a stranger to Plantation for your job. Tom lives nearby, and he stands behind the work with a written 90-Day Done Right Promise on every contract.
Our Home Additions & ADU Services in Plantation
ADU Design & Permitting
In Plantation, the design and permit phase is where an ADU either succeeds or becomes a two-year headache. We draw the plans, submit them to Broward County, and coordinate the HOA architectural review if your property falls under a deed restriction. A large share of Plantation lots carry active HOA rules that Broward permits do not cover, such as specific stucco textures, roof colors, or setback lines. We handle both tracks at once so the county approves the structure and the committee approves the look. Budget for design and permitting as a line item in the overall ADU cost; in our Plantation bids it typically accounts for 8-12% of the job.
Garage Conversion ADU
A garage conversion in Plantation runs $30,000 to $80,000, but the number can climb fast if the slab elevation is too low. Plantation sits on drained Everglades flatland with an exceptionally high water table. Lower the floor even a few inches and you can hit standing groundwater, which turns a simple slab pour into dewatering and waterproofing scope. On a 1960s CBS ranch in Country Club Estates, our crew opened the exterior wall for a permitted room addition and found single-wythe block with unfilled cores and no tie beam. We installed vertical rebar, grout-filled the cells, added a continuous tie beam, then tied our Roofing in Plantation with hurricane strapping. It passed Broward County inspection without a change order, but it would have been an ugly surprise for a homeowner who had not been warned.
New Detached ADU
A new detached ADU in Plantation starts around $90,000 and commonly reaches $220,000 once you factor in a kitchenette, Bathroom Remodeling in Plantation, impact windows, and the site work. The high water table affects the footings: shallow excavation hits groundwater, so slab-on-grade is universal and below-grade construction is essentially non-viable. We plan the pad elevation carefully and we do not cut corners on drainage. Impact windows from PGT or CGI are a standard part of our ADU quotes here; the annual hurricane-season wind loads make anything less a false economy.
Junior ADU & Interior Conversion
If you have an underused den, Florida room, or interior section of your CBS ranch, a junior ADU can be a smarter path than a full detached build. The question we answer first is whether the conversion can stay under Broward County’s threshold for triggering full wind retrofits. When a permitted project crosses the 50% substantial-improvement threshold, the existing house gets pulled into compliance upgrades: impact windows and doors, engineered roof-to-wall connections, hurricane strapping. A well-scoped interior conversion often stays under that line. We will tell you honestly which side of the threshold your scope sits on before you commit.
What happens when you call
- 1
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.
- 3
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 Plantation
We install products our homeowners can look up by name. For Windows & Doors - Plantation on additions and ADUs, we regularly carry PGT, CGI, and Simonton. For a garage conversion getting new glazing or a sunroom addition, Ply Gem is a go-to. These are not mystery brands off a van. South Florida’s UV and humidity eat cheap windows in a few seasons, and the insurance discount Plantation homeowners get for impact-rated openings only holds up if the product is real and the installation is permitted. No trip charge inside the county, and a free second opinion on any written estimate another contractor gave you.
Common Home Additions & ADU Problems We See in Plantation Homes
- Unfilled concrete block cores and missing tie beams. Original 1960s single-wythe block walls look solid but fail current Florida Building Code wind-load calculations. A permitted addition triggers the remediation before the new square footage can be approved.
- The 50% substantial-improvement rule. Cross that threshold under Broward County code and you are paying for impact windows, roof-to-wall connections, and strapping upgrades on the existing house. Many homeowners budget only for the new work and miss this entirely.
- HOA architectural review surprises. Plantation’s deed-restricted neighborhoods often require specific stucco textures, roof colors, or setback lines that the county permit does not even check. Skipping that layer stalls the job after construction begins.
- Groundwater intrusion during excavation. The high water table turns shallow digs for footings or drainage into dewatering projects. We hit it routinely, and we plan for it in the site-prep line item instead of springing it as a surprise.
Pricing for Home Additions & ADU in Plantation, FL
Here are the ranges we write in Plantation bids. These are honest numbers from the local market, not national averages.
| Project Type | Typical Range |
|---|---|
| Room Addition | $45,000-$130,000 |
| Garage Conversion ADU | $30,000-$80,000 |
| ADU Construction (new detached) | $90,000-$220,000 |
The biggest cost driver in Plantation is the condition of the existing structure, not the new square footage. If the original block walls were laid single-wythe with unfilled cores and no continuous tie beam, the structural remediation is a separate line item on the bid, in writing, before you sign. We do not hide it in an allowance and we do not spring it later. Every scope, every allowance, every price change arrives as a written change order before work happens. The allowance that is not on paper is a surprise waiting for a date. Call (877) 610-1318 for a free estimate and a line-by-line walkthrough.
We Also Serve Cities Near Plantation
Our crews serve Plantation and the surrounding communities across Broward County: Plantation, Broadview Park, Lauderhill, Lauderdale Lakes, and Fort Lauderdale. If you are a few minutes outside the Plantation line, the same owner-operated crew answers the call. No trip charge inside the county, and the same written 90-Day Done Right Promise on every job.
Serving Plantation, FL - Our Local Coverage Area
We’re based in the Plantation 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 Plantation
It can, and it depends on the value of the existing structure versus the cost of the conversion. If your project’s scope crosses the 50% threshold, Broward County requires the existing house to be brought into compliance with current wind-load standards: impact windows and doors, engineered roof-to-wall connections, and hurricane strapping. In Plantation, where many homes are 1960s CBS ranches built before the post-Andrew code overhaul, that compliance upgrade can add $20,000 or more to a garage conversion budget. We evaluate the threshold before you commit, in the estimate, in writing. Call (877) 610-1318 and we will run the numbers on your specific property.
Plantation’s housing stock was built almost entirely between the 1950s and 1970s, when Florida’s building code did not require the wind-load resistance that became mandatory after Hurricane Andrew in 1992. Many original block walls were laid single-wythe with unfilled cores and no continuous tie beam. They held up fine for decades of ordinary weather, but the current Florida Building Code treats them as non-compliant once a permitted addition ties into them. The remediation is straightforward: vertical rebar, grout-filled cells, a continuous tie beam, and hurricane strapping. Our crew has done this on Plantation homes often enough that we spot the signs during the first walkthrough.
Many of Plantation’s deed-restricted neighborhoods carry architectural guidelines that Broward County permits do not check at all. Typical rules include specific stucco texture matching the existing finish, approved roof color palettes, setback lines tighter than the county minimum, and even restrictions on whether an ADU can have a separate address or entrance. Skipping the HOA architectural review is one of the most common stalls we see. We pull the HOA documents early in the design phase and submit the architectural package alongside the county permit so the two approve in parallel.
Plantation sits on former Everglades flatland, and the water table is high enough that shallow excavation for footings or drainage runs hits standing groundwater routinely. Slab-on-grade is universal, and below-grade construction is essentially non-viable. For a new detached ADU, that means the pad elevation has to be set carefully, drainage is a real engineering line item, and any thought of a sunken room or lowered slab is off the table. We plan for dewatering in the site-prep line item from the start, not as a change order once the hole fills with water.
Often yes, if the scope stays under Broward County’s 50% substantial-improvement threshold. An interior conversion of an existing den, Florida room, or divided section of the house can be scoped to avoid pulling the whole structure into wind-load compliance. The key is keeping the value of the new work below that threshold relative to the appraised value of the existing home. We will tell you honestly which side of the line your scope sits on. If the threshold is unavoidable, we will put the compliance upgrade in the bid as a written line item, not a surprise. Call (877) 610-1318 for a free estimate.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Plantation and Broward County since 1998.