Fast, Reliable Garage Conversion ADU Across Hialeah
Garage conversion ADUs in Hialeah typically run $180,000-$260,000 all-in for a legalized, permitted unit with impact-rated openings, and most projects take 5-8 months from permit submittal to final inspection. That’s the honest number, and it’s higher than what you’ll see quoted for Broward because Miami-Dade’s post-Hurricane Andrew code doesn’t negotiate. Our Garage Conversion ADU team works across Hialeah, from Palm Avenue to West 12th Avenue, handling everything from attached garage conversions to legalizing the enclosed carport your family has been using as an efficiency for years. Call (971) 497-2402 and you’ll reach a live person who can talk through your property’s specific constraints, not a call center.
We know Hialeah’s housing stock because we’ve opened enough walls here to know what’s behind them: 1950s CBS construction, cloth-insulated wiring, jalousie windows that Miami-Dade will never sign off on, and slabs that sit below the street crown. That’s the work. We do it with a written price before anything starts, per Haven Standard Clause 1, and we document every visit with photos you can actually see.
Why Ellery ADU Studio Is Hialeah’s Preferred Garage Conversion ADU Company
Since 2015, Nadia Ellery has led Ellery ADU Studio as a design-build practice, which matters in Hialeah specifically because the drawings, permit set, and construction are one contract at one written price. When a Hialeah inspector flags a wind-load issue on your garage’s existing header, there’s no designer blaming the builder or the builder pointing at the architect. There’s one team responsible for getting it fixed, and that responsibility is in writing.
We’ve designed, permitted, and built over 900 ADUs since 2015, and the Hialeah projects share a common thread: the existing structure is almost always a CBS garage from the 1950s through 1970s, and the real work is making it comply with Miami-Dade’s wind protocol, not framing new walls. Our crews work in Hialeah neighborhoods weekly, from the dense grid streets off East 4th Avenue down to the older subdivisions near West 8th Avenue. We coordinate scheduling from our Miami (South FL) office, and the people who show up at your Hialeah property are background-checked and uniformed, with a license number you can verify before they step inside.
The 365-Day Done Right Promise applies here like everywhere else: if the finished ADU isn’t built to the permitted drawings, we make it right. In writing, before the project starts. That clause has teeth in Hialeah, where permitted drawings are the only thing standing between you and a code enforcement notice on an unpermitted efficiency.
Our Garage Conversion ADU Services in Hialeah
Attached Garage Conversion
Most Hialeah homes we see are CBS single-family houses built between the early 1950s and late 1970s, and the attached garage is almost always block construction with a flat or low-slope roof. Converting it to an ADU means working with what’s there: the block walls are solid, the roof structure often needs reinforcement for the added ceiling assembly, and the slab is a question mark until we core it. We use a slab elevation survey early, because Hialeah’s high water table and seasonal flooding mean a ground-level ADU that sits below the adjacent street crown will eventually wick moisture through the wall plates. If your lot near Amelia Earhart Park sits low, we address that in the permit set, not after the first wet season.
Detached Garage Conversion
Detached garages in Hialeah are less common than attached but do exist, often set at the rear of the lot with alley access or a narrow side drive. The conversion is cleaner structurally, but the parking replacement rule still applies: Hialeah requires off-street parking lost to a conversion to be replaced on the same parcel. On a 5,000-square-foot lot that’s already fully paved, that means engineering a new concrete pad in what little yard remains, and we include that line item in the written price before you sign anything.
Carport Conversion
Enclosed carports are everywhere in Hialeah, and most were built without permits by a previous owner using whatever materials were on hand. Legalizing a carport conversion means bringing the enclosure up to Miami-Dade’s wind-load standard, which almost always means replacing the old jalousie windows with impact-rated openings and upgrading the roof-to-wall connections. The path exists under Florida’s 2020 ADU preemption law (HB 1359), but it’s a compliance project more than a construction project. We’ve done it, and we document every step in the permit set so the city’s reviewer can see exactly what’s being brought to code.
Garage Partition & Bathroom Add
When a Hialeah family wants to split a two-car garage into a one-car space plus a studio or Junior ADU, the wall and bathroom add is the core of the work. The complication here is plumbing: Hialeah’s older garages rarely have sewer lines stubbed in, so we’re usually running a new lateral to the main line, and the slab has to be cut to do it. High water table conditions mean we spec moisture-resistant underlayment and, where the elevation allows, a slightly raised bathroom floor rather than cutting deeper into a slab that already sits low. The written quote covers the actual plumbing scope, not a placeholder that gets revised mid-project.
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 Hialeah
We specify and coordinate prefab and modular systems from brands including Cover, Dvele, and Boxabl when the project calls for it, and we integrate them under the same single contract that governs the rest of the work. For Hialeah’s older CBS garages, the prefab route doesn’t always make sense, but when a detached garage has enough footprint or we’re doing a full teardown and new build on the existing slab, these systems can shorten the timeline without skipping Miami-Dade’s wind-load requirements. We also work with James Hardie siding and impact-rated window lines that meet the county’s mandatory opening-protection rules, and we keep local supplier relationships in the Hialeah area so materials aren’t sitting on a truck for three weeks while your permit set is being reviewed.
Common Garage Conversion ADU Problems We See in Hialeah Homes
- Unpermitted conversions with non-impact jalousie windows. The jalousie windows on a 1960s Hialeah garage enclosure will never pass Miami-Dade’s post-Andrew code. Every opening has to be replaced with an impact-rated assembly before the ADU can be legalized, and that’s a hard cost we write into the quote from day one, not a surprise at rough inspection.
- Slab-on-grade floors below the street crown. Hialeah’s flat, low-lying terrain means many garage slabs sit lower than the adjacent street, so the first heavy summer storm sends water under the new wall plates. We survey the slab elevation early and design for a raised floor assembly or a stepped foundation detail where the water threat is real.
- Parking replacement nobody planned for. Hialeah’s code requires the off-street parking you lose to a garage conversion to be replaced on the same parcel. On the city’s dense, narrow lots, that often means a new concrete pad in a yard that’s already fully paved, and it’s a cost and design constraint that doesn’t exist a few miles north in Broward.
- Cloth-insulated wiring and termite-compromised framing. Open the walls on a 1954 Hialeah garage and you’re likely to find original cloth-insulated wiring that has to be replaced before the electrical permit clears. Termite damage in the bottom plates is common in block garages with wood-framed interiors, and if we find it, we wrote an allowance for it before we started.
Pricing for Garage Conversion ADU in Hialeah, FL
A full attached garage conversion ADU in Hialeah typically runs $180,000-$260,000, drawings through final inspection, with impact-rated openings included. A carport legalization lands lower, usually $120,000-$180,000, because the structural shell is partly there, but the compliance work is heavier than people expect. A garage partition with a bathroom add for a JADU runs $90,000-$140,000. The Hialeah-specific costs that push numbers higher than Broward are the wind-load openings (impact windows and doors are effectively mandatory) and the parking replacement pad the city requires when you convert the garage. We write these as line items in the original quote, so the $220,000 number you see at signing is the number you pay at final inspection. Call (971) 497-2402 for a written price on your specific property, and if you already have an estimate from another contractor, we’ll give you a second opinion on it free.
We Also Serve Cities Near Hialeah
While this page is for Garage Conversion ADU in Hialeah, our crews also work in Miami Gardens, Miami, North Miami Beach, and Miami Beach. The code picture changes at the county line, and we adjust the permit set accordingly, but the written price and the 365-Day Done Right Promise stay the same wherever your property sits.
Serving Hialeah, FL - Our Local Coverage Area
We’re based in the Hialeah 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 Hialeah
Yes. Hialeah’s code requires that off-street parking lost to a garage conversion be replaced on the same parcel, and on the city’s dense, fully paved lots this usually means engineering a new concrete pad in whatever yard remains. We include the parking replacement line item and site plan in the written quote before you commit, so the pad cost is part of the price from the start, not an add-on at permit review. Call (971) 497-2402 and we’ll check your parcel’s parking requirement against what exists today.
No. Miami-Dade’s post-Hurricane Andrew building protocol requires impact-rated openings on every ADU, and jalousie windows will not pass a wind-load review. Every window and exterior door in the conversion has to be replaced with an impact-rated assembly, which adds real cost to a Hialeah legalization project. We spec the replacement line in the permit set and the written price, so the number is on the page before work starts.
It can, but not the way it sits. If the slab surveys below the adjacent street crown, we design for a raised floor assembly or a stepped foundation detail that keeps the finished floor above the wet-season water line, and we document that elevation in the permit set. Hialeah’s high water table means we’re not going to pour a new slab lower than the existing grade and call it good. Call (971) 497-2402 and we’ll survey your slab before we quote the fix.
Yes, and this is one of the most common projects we take on in Hialeah. Florida’s 2020 ADU preemption law gives a path to legalize these structures, but the enclosure still has to meet Miami-Dade’s wind-load standard, which usually means replacing non-impact windows, upgrading roof-to-wall connections, and sometimes re-framing sections that were built with whatever the previous owner had on hand. We pull the permit, document what’s there, write the compliance scope, and get it approved before we touch the structure.
Yes. Every Hialeah garage conversion quote includes written allowances for the things we know we’ll find when the walls come open: cloth-insulated wiring replacement, termite-compromised bottom plates, and header repairs where decades of re-roofing have caused sag. If a surprise falls outside the allowance, you get a written change order with a price before any additional work is done, per Haven Standard Clause 5. Nothing gets touched until you’ve approved it in writing.
On a 1954 CBS home near Palm Avenue and East 4th Street, our crew opened the garage wall to find original cloth-insulated wiring and a lintel that had sagged a half inch under decades of re-roofing. We pulled the permit, wrote an allowance for the re-framing and a new impact-rated door, and got the surprise stamped before touching the slab so the family could finally legalize the efficiency their tía had been living in for fifteen years. That’s the work, done in the order it has to be done.
Written by Nadia Ellery, Owner at Ellery ADU Studio. Since 2015, we’ve written a price before starting, documented every visit with photos, and put our name on a 365-day promise that if it isn’t done right, we make it right.