Fast, Reliable Garage Conversion ADU Across Flower Mound
A garage conversion ADU in Flower Mound typically runs $185,000 to $310,000 all-in, drawings through final inspection, depending on whether you’re converting an attached two-car garage or partitioning a larger garage into a JADU with a bathroom. The permit path here is genuinely different from what you’ll face in Lewisville or Grapevine, because Flower Mound layers HB 1154 state ADU rights on top of impervious cover limits, lot coverage caps, tree preservation rules, and active HOA architectural review committees that can veto a design the town already approved. We coordinate that entire sequence under one contract at one written price, so you’re not bouncing between a designer, a structural engineer, and a builder while a Wellington HOA board asks for revised elevations. Call (971) 497-2402 and we’ll walk you through what your specific property can actually support.
Why Ellery ADU Studio Is Flower Mound’s Preferred Garage Conversion ADU Company
We’ve designed, permitted, and built Garage Conversion ADU projects across Flower Mound’s master-planned subdivisions long enough to know which HOAs require architectural review packets before the town will even look at a permit application. That sequencing matters. A garage conversion in Wellington or Silverton that skips the HOA step can clear Building Inspections and still get a stop-work demand from the board two months later. We front-load that review, gather the elevation drawings and material samples the committee wants, and get written approval before we pull the permit. It adds a week or two. It also means the project doesn’t die halfway through.
Nadia Ellery founded this studio in 2015 around a simple observation: most ADU projects fail at the handoff between the person who draws the plans and the person who swings the hammer. Our answer is a single design-build contract. The pergola drawings, the structural calcs, the window schedule, the HOA submittal package, and the construction crew all sit under one agreement with one written price. Under Haven Standard Clause 5, the scope is locked at signing. No door-side upsells. No designer pointing at the builder and the builder pointing at the designer. For Flower Mound homeowners who bought between 2015 and 2022 and are now looking at an ADU as a long-term income or aging-in-place asset, that accountability is the whole game.
Our crews are background-checked and uniformed. The license number appears on every document you receive. And every visit includes a documented photo record, so you can see exactly what was found in your garage slab, your stem wall, your roof framing, and your utility stub-outs, not a summary of how it felt.
Our Garage Conversion ADU Services in Flower Mound
Attached Garage Conversion
Most Flower Mound homes we convert are 1990s to 2010s brick-veneer, slab-on-grade builds with attached two-car garages in the 400 to 480 square foot range. That footprint converts cleanly into a one-bedroom ADU with a kitchenette, but the original garage slab was never designed for a conditioned, finished space. On a Wellington project last year, the existing pad had already cracked from Blackland Prairie clay movement. We installed a James Hardie HardieBacker moisture barrier, reinforced the stem wall to meet Flower Mound’s wind-load requirements, and worked with the HOA’s architectural review committee on new window placement before pulling the town permit. A typical attached garage conversion in Flower Mound runs $185,000 to $260,000, with the foundation remediation line item driven by what the slab and soil report actually show.
Detached Garage Conversion
Detached garage conversions carry more permitting weight in Flower Mound than attached work, because the town treats them as separate structures subject to setback reviews, impervious cover calculations, and the tree preservation ordinance. If your detached garage sits under a mature oak or pecan that the town won’t let you disturb, that changes the foundation and drainage plan before a single wall goes up. We specify and coordinate prefab systems from Cover, Abodu, and Dvele where the existing structure can’t be feasibly converted, always inside the same single contract. A detached garage conversion in Flower Mound typically runs $220,000 to $310,000.
Garage Partition & Bathroom Add
This is the highest-value move for Flower Mound homeowners who don’t want to lose their entire garage. You partition off 200 to 300 square feet, add a full bath, and keep a single parking bay plus storage. The bathroom add is where our plumbing and site prep work matters most: many 1990s slab-on-grade homes in Flower Mound have sewer stub-outs on the far side of the house from the garage, which means trenching across the backyard or running a new lateral. We price that line item in writing before work starts. A garage partition with a bathroom add in Flower Mound runs $120,000 to $185,000.
Garage JADU
A JADU carved out of an existing attached garage is the fastest permitted path in Flower Mound right now, especially under HB 1154, because the state law treats attached interior conversions more favorably than new detached structures. The catch this page exists to explain: your HOA may still require architectural review even when the town treats the project as over-the-counter. We prepare both submittal packages in parallel, so neither one becomes the bottleneck. A garage JADU in Flower Mound typically runs $95,000 to $150,000, depending on whether you need a kitchenette or just a wet bar and bath.
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 Flower Mound
We specify and coordinate prefab and modular systems from Abodu, Cover, Dvele, and Mighty Buildings within the same single contract we use for site-built work. For Flower Mound clients considering a prefab panelized system rather than a traditional stick-frame conversion, we handle the manufacturer coordination, the structural review, the HOA submittal, and the site prep. That’s the part most prefab companies don’t do: they deliver panels to the curb and leave you to figure out the foundation, the utility stubs, and the town’s impervious cover math. We own all of it. The written price covers the panel system, the foundation, the utility connections, and the finish work, because the whole point of our model is that nobody gets to point at a different company when something doesn’t meet spec.
Common Garage Conversion ADU Problems We See in Flower Mound Homes
- Slab cracks from Blackland Prairie clay movement. Flower Mound sits on expansive clay that swells in spring rains and shrinks in summer drought. A garage pad poured in 1998 was never intended to support a finished, conditioned space, and the wet-dry cycle opens cracks that telegraph through your new flooring within two years. We include a soil report and a stem wall reinforcement plan in every detached conversion quote.
- Skipped HOA architectural review in Silverton or The Preserves. The town’s Building Inspections Department may approve your garage conversion under HB 1154, but an HOA board with its own architectural committee can still force a redesign or demand removal of unapproved window placement, door style, or exterior finish. We run the HOA submittal before the town permit so you never build something you can’t legally keep.
- Unrated windows and doors that fail Flower Mound’s wind-load inspection. North Texas wind-load requirements here exceed those in many neighboring DFW suburbs. A cheap quote that omits tested window and door assemblies will red-tag at final inspection. Our written quotes name the specific wind-load rating every opening must meet, which products carry it, and the inspection sign-off that proves it.
- Utility stub-outs that were never designed for a second dwelling. Flower Mound’s 0.25 to 1+ acre master-planned lots give you room for an ADU, but the original sewer, water, and electrical service were sized for one house. We map the existing stubs during the design phase, not after demolition, so the trenching and panel upgrade line items are in the written price from day one.
Pricing for Garage Conversion ADU in Flower Mound, TX
Here’s what Flower Mound homeowners should expect, based on the projects we’ve permitted and built in this market:
- Garage JADU: $95,000 - $150,000
- Garage partition with bathroom add: $120,000 - $185,000
- Attached garage conversion: $185,000 - $260,000
- Detached garage conversion: $220,000 - $310,000
Every range above is a written price, not an estimate you call to confirm. What moves you within a range: the soil report findings, the HOA’s required elevation changes, whether your home sits in a FEMA-mapped flood zone near the Grapevine Lake or Elm Fork corridors (which triggers an elevation certificate before the town will issue permits), and the wind-load rating your window and door assemblies have to meet. We deliver the full line-item quote in writing before work starts, per Haven Standard Clause 1. Call (971) 497-2402 and we’ll schedule the site walk and slab inspection that produces your number.
We Also Serve Cities Near Flower Mound
Our crews serve Flower Mound and the surrounding North Texas suburbs, including Southlake, Grapevine, Lewisville, and Coppell. Each has its own permitting quirks, HOA landscape, and soil behavior, and we’ve worked enough jobs in each to know which one wants the architectural review before the permit and which one wants it after. Dispatch and scheduling are coordinated from the brand’s Dallas-Fort Worth office, with local crews serving Flower Mound directly.
Serving Flower Mound, TX - Our Local Coverage Area
We’re based in the Flower Mound 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 Flower Mound
Yes. An attached garage conversion is still treated as conditioned living space under Flower Mound’s building code, which means every new window, door, and wall assembly has to meet the town’s wind-load requirements, which exceed those in many neighboring DFW suburbs. Your original garage door opening, if you’re replacing it with a wall and windows, is the highest-risk point: the new assembly has to be tested and rated, not just framed and flashed. Our written quote names the specific rating each opening must meet, the tested product that carries it, and the final inspection sign-off that documents compliance. That documentation matters for your homeowners insurance after a storm. Call (971) 497-2402 for a written price that includes it.
HB 1154 stops Texas municipalities from outright banning ADUs in single-family zones, but a garage conversion (especially an attached one) generally moves through Flower Mound’s Building Inspections Department faster than a new detached structure because the footprint already exists, the setbacks are already established, and the impervious cover impact is minimal. A detached ADU triggers full setback review, impervious cover calculations against the town’s limits, and the tree preservation ordinance. Both paths still have to clear any applicable HOA architectural review. We handle the submittal sequencing for both, so you don’t get a permit you can’t actually build. Call (971) 497-2402 and we’ll tell you which path your property qualifies for.
Wellington, Silverton, and The Preserves are the three we see most often with active architectural review committees that operate independently of town permitting. Each has its own elevation standards, window style guidelines, and exterior finish requirements, and each can block a garage conversion the town has already approved. The pattern we see: detached ADUs and garage conversions that visibly change the front elevation get the most scrutiny. Our process front-loads the HOA submittal with elevation drawings, material samples, and window placement diagrams before we pull the town permit, which keeps the project from stalling out mid-build. Call (971) 497-2402 and we’ll tell you what your specific HOA is known to require.
Only if your property falls within a FEMA-mapped flood zone. Some parcels in the Grapevine Lake and Elm Fork corridors are inside those zones, and Flower Mound’s permitting office will not issue an ADU permit for a property in a mapped flood zone without an elevation certificate on file. If you’re outside the mapped zone, you don’t need one. We check the FEMA map during our first site visit and tell you in writing whether this applies to your property, so it doesn’t surface as a surprise line item three weeks into the permit process. Call (971) 497-2402 for a written scope that includes this if your property requires it.
After a North Texas storm, your insurance adjuster asks one question first: was the structure built to the code that was in force when it was permitted, and do you have documentation that it was inspected and approved. If your garage conversion used unrated windows or skipped the wind-load inspection, the adjuster can deny the storm-damage claim on the basis of non-compliant construction. Our projects include a documented photo record of every wind-load-rated assembly, the inspection sign-offs, and the permit close-out paperwork. You get that file at completion. It’s not a warranty promise. It’s evidence. That evidence is what turns a denied claim into a paid one. Call (971) 497-2402 and we’ll explain exactly what your compliance file will contain.
Written by Nadia Ellery, Owner at Ellery ADU Studio. We design, permit, and build garage conversion ADUs across Flower Mound under one contract at one written price, with a documented photo record on every visit and a 365-Day Done Right Promise in writing.