Fast, Reliable Garage Conversion ADU Across Miami
A garage conversion ADU in Miami typically runs $140,000-$260,000 all-in, drawings through final inspection, and the two line items that move that number more than anything else are Miami-Dade NOA window certification and sewer tie-in requirements on high-water-table lots. We serve every Miami neighborhood, from Little Havana to Allapattah to Liberty City, and we quote a written price before any work starts, per Haven Standard Clause 1. Call (971) 497-2402 to schedule a walkthrough and get your written scope and price.
Most Miami garage conversions are really two jobs stacked on top of each other: the legalization of a structure that may already have decades of informal use, and the code remediation that a permit triggers once walls are open. We plan for both. The inspection comes first, allowances are written into the contract, and any surprise is priced and approved in writing before we touch it.
Why Ellery ADU Studio Is Miami’s Preferred Garage Conversion ADU Company
We’re a design-build studio, not a general contractor handing your drawings to a third builder. The drawings, the Miami-Dade permit set, and the construction are a single contract at a single written price. That eliminates the designer-versus-builder blame gap that stalls so many ADU projects when an inspector flags a window sticker or a drain line turns out to be cast iron instead of PVC.
Nadia Ellery founded the studio in 2015, and every project still runs through her desk. We’ve designed, permitted, and built 900+ ADUs since then, each one with a written price before work began and a documented photo record when it was done. Miami homeowners researching a garage conversion tend to be thorough, and the documentation is what earns the callback. You receive the permit set, not a summary. You receive photos from every visit, not a verbal update.
Our Miami crews are background-checked and uniformed, and our license number appears on every page we produce for your permit package. A live person answers calls at (971) 497-2402 around the clock, no voicemail queue.
Our Garage Conversion ADU Services in Miami
Here’s what we actually do in Miami, and how each service interacts with the local housing stock. Miami’s single-family homes are dominated by 1940s-1970s concrete block and stucco, or CBS, construction. Structurally solid for ADU work, but frequently hiding undersized 100-amp electrical services and original cast-iron drain lines that must be replaced before a certificate of occupancy will be issued. Our Garage Conversion ADU work accounts for this from the first walkthrough.
Attached Garage Conversion
Attached garages on Miami CBS homes usually share a wall with the main house, which means the conversion inherits whatever electrical service and plumbing the original build had. In Little Haiti and Liberty City especially, we regularly find 60-amp subpanels feeding garages that are now expected to carry a mini-split, a kitchenette, and a bathroom. We upgrade to 200 amps before framing, and we write that upgrade into the allowance so it’s not a surprise change order after drywall is open.
Detached Garage Conversion
Detached garages in Miami sit on slab-on-grade foundations over porous oolitic limestone, with a water table often only 2-4 feet below grade. That means no basement options, which makes the detached garage the best candidate for a full ADU with its own entrance. The catch: if the garage has an old septic line, Miami-Dade typically requires a mandatory municipal sewer tie-in, and that runs over $10,000 before a single wall is framed. We flag this in the initial walkthrough and build it into the written price.
Garage Partition & Bathroom Add
For a Junior ADU inside an existing garage envelope, we partition the space and add a bathroom while preserving a small storage bay. These projects move quickly when the garage is on the main house’s sewer line. When it’s not, the sewer tie-in question controls the budget. We also specify James Hardie paneling for interior partition walls in high-humidity garages in Allapattah that lack mechanical ventilation, because standard drywall in a non-conditioned bay fails fast in Climate Zone 1A.
Carport Conversion
Carports in North Miami Beach and Miami Gardens are often enclosed informally years before a permit is ever pulled, which means the walls, windows, and roof assemblies may or may not meet current code. We convert carports into conditioned ADUs by first documenting what exists, then designing the enclosure to Miami-Dade NOA standards from the outset, not as a retrofit. A full Garage Conversion ADU in Miami that started life as a carport typically runs $120,000-$200,000 depending on whether the slab can support the enclosure and whether a bathroom requires a sewer tie-in.
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 Miami
Ellery ADU Studio specifies and coordinates prefab and modular systems from Abodu, Cover, Dvele, and others within the same single contract. For Miami garage conversions specifically, we lean on James Hardie siding and panel systems when the building envelope needs a moisture-tolerant upgrade. We don’t have a warehouse in Miami; we stage materials through local suppliers and coordinate delivery to your site in Little Havana, Allapattah, or wherever the garage sits. If a panel arrives damaged or a window carries the wrong certification sticker, the replacement is on us to sort out before inspection day, not on you to chase down.
Common Garage Conversion ADU Problems We See in Miami Homes
- Windows carrying a standard Florida Product Approval sticker but no Miami-Dade NOA. This is the single most common inspection failure we see on Miami ADU jobs. Contractors who work mostly in Broward specify a window that passed there last month; Miami-Dade inspectors treat the two certifications as entirely separate, and the unit gets flagged and pulled. We swap in NOA-certified units before inspection, which we do by specifying them from the start.
- Cast-iron drain lines and 60-amp subpanels discovered after the drywall is open. On a 1950s concrete block garage in Little Havana, we opened the wall to find original cast-iron drains and a 60-amp subpanel feeding the garage. We replaced the cast iron with PVC, upgraded the service to 200 amps, and wrote the permit-triggered upgrades into the allowance. The owner had already received a flag from a Broward contractor for specifying windows with the wrong sticker; we swapped in Miami-Dade NOA units before inspection. Without allowances, that same discovery would have been an $8,000-$15,000 surprise.
- Undersized mini-splits specified using a rule of thumb from a seasonal climate. Miami is Climate Zone 1A. Detached ADU mini-splits here run at essentially full load, year-round, in near-constant heat and humidity. A unit sized for a garage conversion in a seasonal market will run continuously and fail to hold temperature here, and the client notices immediately. We size for full-load operation and no cycling strain.
- Mandatory sewer tie-ins on high-water-table lots. Miami sits on porous oolitic limestone with a water table often just 2-4 feet below grade. Basements are impossible, and any ADU requiring a new septic connection typically triggers a municipal sewer tie-in that can cost over $10,000 before framing begins. We identify this requirement during the initial walkthrough, not after the contract is signed.
Pricing for Garage Conversion ADU in Miami, FL
An attached garage conversion in Miami typically runs $140,000-$220,000 all-in. A detached garage conversion runs $160,000-$260,000. A garage partition with a bathroom add runs $90,000-$150,000. A carport conversion runs $120,000-$200,000. These ranges include drawings, the Miami-Dade permit set, construction, and final inspection. The two big variables in Miami are the window package, because every unit must carry a Miami-Dade NOA, and the sewer tie-in, which may be mandatory depending on your lot’s drainage history and the garage’s existing connection.
Every project is quoted with a written price before any work begins. That’s Haven Standard Clause 1. There’s no door-side upsell and no scope creep after signing; Clause 5 locks the scope at signing. Call (971) 497-2402 for a free estimate, and we’ll put the numbers on paper.
We Also Serve Cities Near Miami
Beyond Miami proper, we serve Miami Beach, Hialeah, Miami Gardens, and North Miami Beach. The permitting rules stay Miami-Dade County all the way through, but the drive time and site conditions change, which means the walkthrough and written price get adjusted accordingly. If your garage sits in one of those cities, call (971) 497-2402 and we’ll schedule the same inspection-first process we use in Miami.
Serving Miami, FL - Our Local Coverage Area
We’re based in the Miami 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 - Garage Conversion ADU in Miami
Because Miami-Dade County requires a county-specific Miami-Dade Notice of Acceptance, or NOA, for all windows, doors, and roofing on permitted construction, including ADUs. The NOA standard exceeds the HVHZ requirements applied in neighboring Broward County. The same window unit that passed a Broward ADU inspection last month will be flagged and pulled at a Miami-Dade inspection, because the county’s inspectors treat the Florida Product Approval sticker and the Miami-Dade NOA as entirely separate certifications. Call (971) 497-2402 and we’ll specify NOA-certified units from the start, so the window package is never the reason your inspection fails.
In most Miami-Dade cases, yes. Miami sits on porous oolitic limestone with a water table often just 2-4 feet below grade, and the county typically mandates a municipal sewer tie-in for any ADU that requires a new septic connection. That tie-in can cost over $10,000 before a single wall is framed. We identify the requirement during the initial walkthrough and write it into the price, so it’s not a surprise after contracts are signed. Call (971) 497-2402 for an exact quote.
The budget moves when the walls reveal cast-iron drain lines, 60-amp subpanels, or non-NOA windows. On a 1950s concrete block garage in Little Havana, we found original cast-iron drains and a 60-amp subpanel behind the drywall. We replaced the cast iron with PVC, upgraded the service to 200 amps, and wrote the permit-triggered upgrades into the allowance before framing began. That’s how we handle every Miami conversion: inspection first, allowances written into the contract, and any surprise priced and approved in writing before we touch it. Call (971) 497-2402 and we’ll walk your garage before you sign anything.
You can convert a carport into an ADU in Miami, and many carports in North Miami Beach and Miami Gardens are already partially enclosed without permits. The conversion requires documenting the existing condition, designing the enclosure to Miami-Dade NOA standards, and verifying that the slab can support the new conditioned space. A carport conversion in Miami typically runs $120,000-$200,000. Call (971) 497-2402 for a written price on your specific carport.
We size it for full-load operation in Climate Zone 1A, where detached ADU mini-splits run essentially year-round in near-constant heat and humidity. Undersizing that might go unnoticed in a seasonal climate becomes an immediate failure in Miami, because the unit runs continuously and can’t hold temperature. We calculate the load for your specific garage footprint, insulation assembly, and window package, then specify the unit accordingly. Call (971) 497-2402 and we’ll include the proper mini-split sizing in your written scope.
Contact Ellery ADU Studio in Miami
If you’re weighing a garage conversion ADU in Miami, the next step is a walkthrough and a written price. We’ll inspect the garage, check the existing electrical service and drain lines, verify the window package against Miami-Dade NOA requirements, and put the entire scope on paper before any work starts. Call (971) 497-2402 to schedule your free estimate. No urgency, no vague ranges; just a documented price for a documented build.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Miami with design-build ADU services since 2015.
Garage Conversion ADU in Nearby Areas
