Garage Conversion ADU in Colleyville - Plans, Permits & Build, One Fixed Price

Fast, Reliable Garage Conversion ADU Across Colleyville

A garage conversion ADU in Colleyville typically runs $160,000-$240,000 all-in, drawings through final inspection, depending on whether you’re converting an attached bay, a detached structure, or partitioning an oversized garage with a bath addition. We coordinate the full project from our Dallas-Fort Worth office, and crews serve Colleyville locally, so you’re never waiting on a dispatcher in another state. The bigger variable here isn’t framing or drywall. It’s architectural review. Call (971) 497-2402 and we’ll tell you what your specific lot and HOA will actually allow before you spend a dollar.

Call (971) 497-2402

Colleyville’s estate-scale lots and custom housing stock mean most ADU work centers on structures that already exist. The obstacle is rarely the city. It’s the covenant review board sitting between you and your permit. We handle that first.

Why Ellery ADU Studio Is Colleyville’s Preferred Garage Conversion ADU Company

Ellery ADU Studio has designed, permitted, and built 900+ ADUs since 2015. Every one carried a written price before work started, per Haven Standard Clause 1. That matters in Colleyville specifically because the first cost you’ll face isn’t construction. It’s an HOA submittal packet that either gets approved on the first pass or sends you back six weeks with a redlined drawing.

We file the architectural review submittal ourselves. Not a subcontractor. Not a plan mill. The same team that draws the permit set prepares the elevation drawings, material samples, and color schedules the committee wants to see. We know which brick profiles read as “matching” to a Colleyville review board and which modern cladding choices will draw an automatic rejection. That local knowledge is the difference between a permit pulled in March and a stop-work order in May.

Nadia Ellery leads every project. When a review committee asks why the window trim differs from the original garage, we answer with a drawing, not a shrug. When a client in the Tara Plantation area needed a variance for setback distance, we documented the existing structure’s footprint and got the approval without a resubmittal. Reputation in Colleyville isn’t built on yard signs. It’s built on review boards that remember which studio showed up prepared.

Our Garage Conversion ADU Services in Colleyville

Four conversion types cover most Colleyville lots. Each starts with a written scope and price, and each ends with a documented photo record and a 365-Day Done Right Promise. No side-door upsells. No designer-versus-builder finger-pointing, because the drawings, permit set, and construction are one contract.

Detached Garage Conversion

This is where Colleyville’s housing stock works in your favor. A detached three-car garage on a half-acre lot already has four walls, a roof, and often a bathroom rough-in that never got finished. Our Garage Conversion ADU team converts that shell into a one-bedroom unit, but first we verify the foundation. On Blackland Prairie clay, a detached conversion poured without post-tension or pier-and-beam engineering shows hairline cracks within a year. We spec the right slab from day one, and we show you the engineering letter in your permit set.

Attached Garage Conversion

Attached bays are simpler on foundation risk but harder on architectural review. The conversion is visible from the street, so the committee cares about the exterior transition: how the new wall reads against the existing brick, whether the former garage door opening becomes a window, a French door, or something that looks like an afterthought. We’ve converted attached garages on the oversized lots near Glade Road and throughout the neighborhoods north of Highway 26. The submittal packet always includes a street-facing elevation drawing with the masonry coursing shown to match. Committees approve what they can see on paper.

Carport Conversion

Less common in Colleyville than in older Texas suburbs, but they exist, especially on mid-1980s builds. A carport conversion requires enclosing three sides, adding a proper foundation pour, and bringing the structure up to current energy code. The foundation spec is the real cost driver here, same clay soil, same engineering requirement. We show you the slab design in the written scope before any concrete is ordered.

Garage Partition & Bathroom Add

For homeowners who don’t want a full separate dwelling, partitioning an oversized garage into an ADU plus retained storage, or adding a bathroom to an existing guest-quarter structure, often clears HOA review faster because the exterior changes are minimal. On lots in the southeastern neighborhoods where detached buildings already exist, a partition and bath add can be the quiet path to a legal, rentable unit without triggering the covenant amendment process. We’ll tell you honestly which route your CC&Rs will tolerate.

Trusted Brands We Service in Colleyville

We specify and coordinate prefab and modular systems from Abodu, Cover, and Dvele within the same single contract, so you’re not juggling a shell manufacturer, a site contractor, and a designer. For Colleyville projects where the HOA hates visible change, a Dvele panel system can reduce on-site framing time and keep the streetscape quiet during construction. For a detached garage conversion with existing masonry, we can match the brick and use a James Hardie panel where the committee allows, giving you a durable exterior that doesn’t fight the neighborhood character. The brand choice follows the review constraints, not the other way around.

Common Garage Conversion ADU Problems We See in Colleyville Homes

• HOA architectural review rejects the submittal because the exterior siding or roof pitch fails to match the original brick and trim. This usually happens after the homeowner already paid for plans drawn without committee feedback. We reverse the order: review constraints first, drawings second.
• Foundation movement from Blackland Prairie clay cracks a standard slab. A detached conversion poured without post-tension or pier-and-beam engineering shows hairline fractures within a year. We spec the engineered slab in the written price, not as a change order later.
• The homeowner files a city permit before obtaining HOA covenant amendment. The city issues a stop-work order when the HOA denies architectural approval mid-project. The sequence matters, and we file in the right order every time.
• Roofline and trim mismatch draws a resubmittal request, adding 4-8 weeks. The committee wants to see identical roof pitch, fascia profile, and masonry coursing. We draw that on the first pass.

Pricing for Garage Conversion ADU in Colleyville, TX

How Colleyville HOA Review Actually Works

Here’s the part most contractors won’t tell you upfront. Many Colleyville subdivisions have HOAs whose CC&Rs explicitly ban “secondary dwelling units” or “servant’s quarters,” even though state law and city zoning permit garage conversions. That means a homeowner often needs a formal membership vote to amend the covenants before any permit application makes sense. A Colleyville homeowner with a 22,000-sq-ft lot and a detached three-car garage often discovers their project is city-code-legal but HOA-prohibited. The CC&Rs in many of the city’s gated enclaves were written in the 1990s and haven’t been updated since Texas ADU legislation shifted the landscape.

We file the covenant amendment request first. We prepare the agenda language, attend the membership meeting if needed, and get the amendment recorded before we submit drawings to the architectural review committee. Then we schedule the review submittal with a complete packet: street-facing elevations showing existing brick veneer matched course-for-course, roof pitch drawn to the original 8:12 or 10:12, trim profiles dimensioned, and a finish schedule with color codes. We schedule construction only after the committee approves in writing. That way the work is never sitting half-finished waiting on a committee that meets once a month.

On a half-acre lot in the Lexington Downs neighborhood, our crew converted a detached three-car garage into a one-bedroom ADU. Because the 1998 CC&Rs prohibited secondary dwellings, we first secured a membership vote to amend the covenants, then matched the existing brick veneer, 8:12 roof pitch, and trim profile in our submittal. The architectural review committee approved with no comments after we included an elevation drawing showing identical masonry and roof lines. That’s the sequence. Review constraints, then draw, then build.

We Also Serve Cities Near Colleyville

We serve Garage Conversion ADU in Colleyville and the surrounding communities of Bedford, Euless, Southlake, and Hurst. Each city has its own review quirks. Colleyville’s is the covenant-heavy HOA layer, and we’ve built our process around it. If you’re in a neighboring city with a different set of rules, we apply the same written-price, documented-record standard. Call (971) 497-2402 for a free second opinion on any written estimate you already have in hand.

FAQs - Garage Conversion ADU in Colleyville

Key Takeaways

• Written price before any work starts, per Haven Standard Clause 1. No “call for a quote” runaround.
• Architectural review submittal prepared and filed by our team, with brick-matching and roof-pitch drawings the committee expects.
• Covenant amendment handled first when your HOA bans secondary dwellings.
• Foundation spec written for expansive clay, not a generic slab.
• One contract covers drawings, permit set, and construction. No designer-versus-builder gap.

Call Ellery ADU Studio for Your Colleyville Garage Conversion

If you have a written estimate from another contractor, bring it to us. We’ll give you a free second opinion and a written, line-item price for the same scope, drawings through final inspection. A live person answers (971) 497-2402 24/7. You’ll speak to someone who knows Colleyville’s review boards, not a call center. Call today for your free estimate.

Written by Nadia Ellery, Owner at Ellery ADU Studio.