Garage Conversion ADU in Boca Raton: What It Really Costs and What Actually Happens
A garage conversion ADU in Boca Raton typically runs $140,000 to $240,000 all-in, drawings through final inspection. The number moves based on what our crew finds when the walls come open: a 1970s Camino Gardens garage with original aluminum wiring and a 100-amp panel lands differently than a 1990s CBS build with a modern service. You’ll see the written price before any work starts, per Haven Standard Clause 1.
If you’re weighing this project in Boca Raton, call (971) 497-2402. We’ll walk the garage, check the panel, slab, and trusses, and give you a line-item written estimate. No “call for a quote” here. The price is on the page, in writing, before you commit to anything.
Why Boca Raton Garage Conversions Follow a Different Rulebook
Boca Raton carries a structural quirk most Florida cities don’t. The state’s 2020 HB 1339 preemption law bars municipalities from prohibiting ADUs in single-family zones, but it does not override private deed restrictions. In Boca West, Broken Sound, and hundreds of smaller gated communities, an HOA Architectural Review Committee can deny a garage conversion even after the City of Boca Raton issues a building permit. That means a homeowner can hold a valid city permit they cannot legally act on, with application fees already spent. This is far less common in neighboring Delray Beach, where HOA density is lower.
Our Garage Conversion ADU team starts every Boca Raton project with written HOA covenant analysis before the city application is filed. We’ve seen the alternative too many times: a permit pulled first, an HOA denial second, and a homeowner out thousands with nothing to show.
Our Garage Conversion ADU Services in Boca Raton
Ellery ADU Studio operates as a design-build studio. That means the permit set, the drawings, and the construction are one contract at one written price, not a designer passing blame to a builder when something comes back from the city flagged. Since 2015, we’ve designed, permitted, and built 900+ ADUs under that model.
Attached Garage Conversion
Most Boca Raton homes built between the late 1960s and early 1990s use CBS construction, concrete block stucco with a garage carved under the main roofline. An attached conversion means we’re working inside your existing footprint, which matters in neighborhoods like Camino Gardens where screened pool enclosures already consume the backyard. We handle the slab elevation check, the wall assembly upgrade to meet current wind-load code, and the panel math before we submit drawings.
Detached Garage Conversion
A detached garage ADU in Boca Raton must meet Florida Building Code wind-load design pressures of 150 to 175 mph. That changes everything about the framing: hold-downs, strapping, impact-rated openings, and the roof-to-wall connection all get specified differently than a Central Florida build. We write those costs into your upfront price, not as a surprise change order mid-permit.
Carport Conversion
Carports are rarer in Boca’s established neighborhoods, but they exist. Converting one means building a full wall envelope from scratch, which triggers the same wind-load and moisture-barrier requirements as new construction. We’re direct about it: a carport conversion often costs as much as a modest detached build once the engineering is done right.
Garage Partition & Bathroom Add
This is the quiet workhorse of Boca garage conversions. A partition wall splits the garage, leaving storage or a workshop on one side and a conditioned ADU on the other. We add the bathroom, the kitchenette, and the subpanel. The existing slab stays, but we check it for moisture wicking first. Palm Beach County’s shallow water table means an unsealed slab can pull moisture up through the flooring and into your drywall within a year.
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 Work With in Boca Raton
When a project calls for a prefab or modular system, we specify and coordinate within the same single contract. We work regularly with Abodu, Cover, and Dvele. That doesn’t mean you’re locked into a catalog box. It means we’re fluent enough in those systems to integrate their structural requirements with Boca Raton’s wind-load code and your HOA’s architectural standards, so the drawings pass review the first time.
Why Ellery ADU Studio Is the Right Fit for Boca Raton
We’re not a Boca Raton company that’s been here since some founding year we’d have to print on a T-shirt. We coordinate Boca work from the brand’s South Florida office in Miami, and crews serve Boca Raton locally. What we bring is documented process: a written photo record on every visit, a written scope locked at signing under Haven Standard Clause 5 (No Surprises), and a 365-Day Done Right Promise that says if the finished ADU is not built to the permitted drawings, we make it right, in writing, before the project starts.
Nadia Ellery leads the studio. Every project carries her review on the permit set before it goes to the city.
Common Garage Conversion ADU Problems We See in Boca Raton Homes
- HOA permit sequence errors. A homeowner files the city application first, pays fees, gets a permit, then the Architectural Review Committee denies the conversion on aesthetic grounds. The fees are gone. This is preventable with covenant analysis first. The city permit should be the second approval, not the first.
- Panel undersizing in 1970s CBS homes. Camino Gardens and similar-era neighborhoods were built with 100-amp service sized for a simpler load. Add a mini-split, induction cooktop, and dryer to a garage ADU and you’re tripping breakers or worse. A 200-amp upgrade is common, and it should be in the contract from day one.
- Missing vapor barrier on detached slabs. The water table across Palm Beach County sits shallow. A detached garage slab poured without an under-slab vapor barrier will wick moisture up through the slab, into the flooring, and eventually into the drywall. By the time you see mold, the fix is demolition.
- Wind-load shortcuts. A contractor who prices Boca work like a Central Florida job will under-spec the hold-downs and strapping. The plans get kicked back by the city reviewer, or worse, the structure gets built and fails inspection. Impact-rated openings are not optional here.
What Opening Up an Older Boca Garage Actually Turns Up
In Camino Gardens, our crew opened up a 1970s single-car garage to find original aluminum wiring and a 100-amp panel that couldn’t carry the new kitchenette. We wrote an allowance for a 200-amp service upgrade into the contract. When the framing exposed termite-damaged sill plates, we priced the repair and got written approval before touching the next stud. That’s the sequence every project follows: inspect first, write allowances into the contract, price any surprise in writing, and get your sign-off before we move forward.
This is the single biggest reason a remodel quote moves after work begins. An ADU contractor who doesn’t write these allowances is pricing fiction. Our job is to give you a fixed price that accounts for what we know we’ll find in this housing stock, plus a transparent process for what we can’t see until the drywall comes down.
Pricing for Garage Conversion ADU in Boca Raton, FL
A typical attached garage conversion in Boca Raton runs $140,000 to $200,000. A detached garage ADU with wind-load engineering and a new foundation starts around $180,000 and can reach $240,000 depending on finishes and the HOA’s material requirements. A garage partition with bathroom add lands between $80,000 and $130,000. Carport conversions are case-by-case because you’re building a full envelope.
What moves the number: panel upgrades, impact-rated windows and doors, HOA-mandated exterior matching, and any termite or moisture remediation. Every price is written before work starts. Call (971) 497-2402 to schedule a free estimate on your Boca Raton garage.
| Boca Raton Garage ADU Scope | Typical All-In Range |
|---|---|
| Attached garage conversion, full ADU | $140,000 - $200,000 |
| Detached garage ADU with new foundation | $180,000 - $240,000 |
| Garage partition + bathroom add | $80,000 - $130,000 |
| Carport conversion (new envelope) | $150,000 - $210,000 |
| 200-amp panel upgrade (allowance) | $4,000 - $7,000 |
Boca Raton’s HOA Landscape and Your Garage ADU
Boca Raton has one of the densest concentrations of HOA-governed communities in Florida. Boca West, Broken Sound, and the smaller gated subdivisions around them all carry private deed restrictions. Florida’s HB 1339 says the city cannot prohibit your ADU. It says nothing about your HOA. We have watched Architectural Review Committees deny ADU applications on aesthetic covenant grounds after the City of Boca Raton issued a building permit. The homeowner held valid city paperwork they could not legally act on.
That is the most city-specific and legally consequential step in any Boca Raton ADU project. Before we draw a single line, we request the HOA’s governing documents and architectural guidelines. We read the covenant language. We flag anything that conflicts with your conversion plans before you spend money on city fees. This analysis is not a generic step. It’s the difference between a smooth build and an expensive stranded permit.
We Also Serve Cities Near Boca Raton
Ellery ADU Studio provides Garage Conversion ADU in Boca Raton and the surrounding South Florida area. Our crews work in Delray Beach, Pompano Beach, Boynton Beach, and Margate. HOA density drops off quickly outside Boca’s city limits, and the pricing and permit sequence adjust accordingly.
Serving Boca Raton, FL - Our Local Coverage Area
We’re based in the Boca Raton 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 Boca Raton
We re-grade the plan to meet the city’s required slab elevation above the shallow Palm Beach County water table, then add an under-slab vapor barrier and moisture detailing to the foundation drawing. We’ll resubmit the revised foundation plan to the city and price the change in writing before any concrete gets poured. Call (971) 497-2402 and we’ll review the reviewer’s comments with you.
Yes. We draw the door, trim, and stucco finish to meet Broken Sound’s architectural standards, and we submit that drawing to the ARC before we file with the city. The HOA’s material requirements become part of your written scope, so there’s no back-and-forth about what “matching” means after the permit is already issued.
Yes. Most 1970s CBS garages in Camino Gardens were not engineered for the loads a conditioned ADU adds. A Florida-licensed structural engineer signs off on the header replacement, the wall assembly, and the wind-load path. We manage that engineering within your written price. It’s not an optional line item.
Legally, no. A private deed restriction is a contract you signed when you bought the home. The city permit does not override it. This is exactly why we insist on written HOA approval before the city application is filed. If you’re already in this position, call (971) 497-2402 for a free second opinion on whether the covenant language has any exceptions worth pursuing.
Boca Raton sits in the South Florida high-velocity hurricane zone, so any new ADU structure must meet design pressures of 150 to 175 mph. That means continuous load-path strapping from roof to foundation, impact-rated openings, and hold-downs at every corner. A “normal” garage built to older code won’t pass. Your written price includes the full wind-load engineering, not a retrofit later.
Get Your Written Price Before Any Work Starts
We don’t do “call for a quote.” Every Boca Raton garage conversion ADU project gets a written price before work begins, per Haven Standard Clause 1. The scope is locked at signing under Clause 5, with no door-side upsells. A live person answers at (971) 497-2402, 24/7. If you already have a written estimate from another contractor, bring it in. We’ll give you a free second opinion, line by line.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Boca Raton and South Florida with design-build ADU services since 2015.