A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable Garage Conversion Contractor Across Grapevine
A garage conversion in Grapevine typically costs between $85,000 and $145,000 before permit fees, depending on whether you’re converting an attached or detached garage and what finish level you want. Most Grapevine projects run 8 to 14 weeks from demo to final inspection. We’re Fielding ADU Dallas, the garage conversion and ADU specialist inside Garrison Partners, and we’ve worked the Grapevine permitting pipeline long enough to know where projects stall and how to keep them moving. Call (903) 342-8977 for a written price before any work starts.
Why Fielding ADU Dallas Is Grapevine’s Preferred Garage Conversion Contractor Company
Grapevine homeowners call us because we put the price in writing before a single nail is driven. That’s not a sales line. It’s how we’ve operated since 2006 under The Garrison Standard, and it’s the reason our Grapevine customers know the number they approve on day one is the number on the final invoice. No door money, no mid-project change orders dressed up as “unforeseen conditions.”
Reed Calloway leads our Grapevine work. He’s been through the city’s design review process enough times to pre-check historic preservation guidelines before drawings go in. That saves weeks. Every crew member on your Grapevine job is background-checked, uniformed, and verified before they set foot on your property. You’ll know exactly who’s on site and who to call if a question comes up.
Our Grapevine customers also get something most contractors don’t offer: a written one-year guarantee. The Garrison Standard covers workmanship defects for 365 days. If something fails inside that window, we return and correct it at no charge. That’s on paper, not in a handshake. And when you call, a live person answers. No voicemail queue. No callback at 3pm. Whether you call at noon or midnight, someone picks up.
Garage Conversion ADU in Grapevine
A Garage Conversion ADU in Grapevine means turning an existing garage into a self-contained dwelling unit with its own kitchen, bathroom, sleeping area, and separate entrance. This is the work most Grapevine homeowners pursue when they want rental income or a private space for aging parents without building new foundation work. In Grapevine, a finished garage conversion ADU typically runs $110,000 to $145,000 before permit fees, with most of that cost going to plumbing rough-in, electrical service, insulation, and HVAC.
The permit path here isn’t the same as a standard interior remodel. Grapevine’s “granny flat” ordinance only allows ADUs on lots of 7,200 square feet or larger, with rear yard setbacks. That single rule pushes most garage conversion ADU projects to the 1970s-80s subdivisions north of Highway 114, where lots are larger and the zoning math works. Before we draw plans, we check your lot dimensions against the ordinance so you’re not paying for a design that can’t be permitted.
Attached Garage Conversion
When the garage shares a wall with the main house, you’re often starting with better bones: existing foundation, shared utilities, and easier access. In Grapevine’s ranch-style homes from the 70s and 80s, attached garage conversions usually run $85,000 to $110,000. The main cost drivers are relocating the garage door opening to solid wall, raising the floor to match living space, and pulling new electrical circuits.
Detached Garage to Living Space
Detached conversions in Grapevine cost more because you’re running separate utility lines, insulating four exterior walls, and often upgrading the slab. Expect $95,000 to $130,000 depending on whether you’re adding a bathroom. For properties near Grapevine Lake, we also check flood zone maps before pricing. If the detached garage sits in a flood-prone area, the city may require elevated foundation details or flood-resistant materials that change the quote.
Garage Apartment Conversion in Grapevine
A Garage Apartment Conversion in Grapevine is what most people mean when they say “garage apartment” or “granny flat”: a full living space above or within an existing garage, built to code as a legal dwelling. This is where Grapevine’s historic district rules hit hardest. In the older central areas with Craftsman and Victorian homes from the early 1900s, the city’s design review process can reject a conversion if the exterior doesn’t match the original home’s architecture. That often means matching brick or board-and-batten siding, not just any siding off the shelf. In Grapevine’s Historic District, our crew converted a detached 1920s garage into an ADU, where we matched the existing Craftsman board-and-batten siding and installed engineered hurricane ties to meet wind-load requirements before the city’s design review and final inspection. The homeowner later used our documented compliance report to confirm coverage with their insurer.
For a standard garage apartment conversion in Grapevine’s newer subdivisions, pricing runs $120,000 to $145,000 before permits. The historic district conversions can add 10 to 20 percent to that number, because the material requirements are prescriptive and the design review cycle is longer. We factor that into your written quote on the front end, so there’s no surprise when the preservation officer asks for matching brick.
Garage to Bedroom Conversion
Not every garage conversion needs a kitchen. A garage-to-bedroom conversion in Grapevine, whether it’s a primary suite addition or a guest room, runs $65,000 to $90,000. This is the most common scope we see in the brick ranch homes north of 114, where homeowners want an extra bedroom without a full ADU permit. You still need proper egress windows, insulation to current code, and HVAC supply, but you skip the full kitchen and separate meter requirements.
Garage ADU with Prefab Systems
For Grapevine homeowners who want speed and predictability, we work with prefab and modular ADU platforms including Boxabl and Plant Prefab, plus conventional builds using James Hardie siding. A prefab garage ADU can cut site time significantly, but Grapevine’s zoning and design review still apply to the final placement and exterior finish. We coordinate the platform specs with local code requirements so the unit that arrives on the truck is the unit that passes inspection.
Trusted Brands We Service in Grapevine
We work with the systems Grapevine homeowners are already researching: Boxabl for rapid-deploy ADU shells, Plant Prefab for custom-modular units, Tuff Shed-style structures where the budget is tighter, and James Hardie fiber cement siding when a conversion needs to match an existing exterior. Because our Grapevine work pulls from these platforms regularly, we keep current on their spec sheets and installation requirements. That means fewer delays when your project hits the materials stage. We don’t stock prefab units on a shelf in Grapevine, but we coordinate delivery windows and inspection scheduling so crews aren’t standing around waiting for a panel that’s still on a truck.
Common Garage Conversion Contractor Problems We See in Grapevine Homes
- Wind-load failures on roof-to-wall connections. Grapevine sits in a wind zone where the city’s structural review checks uplift ratings. Under-spec’d framing clips and anchor bolts fail inspection. Every conversion we quote includes engineered hurricane ties and documented load ratings.
- Historic district design rejection. If you’re in the Historic District and the plans show standard siding instead of the original home’s material, the preservation officer will send you back. We pre-check the city’s historic preservation guidelines before drawings are submitted, so you don’t lose six weeks on a resubmission.
- Omitted flood-resistant details near Grapevine Lake. Properties in flood-prone zones need elevated foundation details or flood-resistant materials. Skip that in the quote and you either get a permit denial or, worse, a future insurance claim denial. We check FEMA maps as part of the estimate.
- Mismatched HVAC sizing. Grapevine’s humid summers punish undersized air conditioning. A garage conversion needs a properly calculated load, not a guess. Our quotes include a Manual J load calculation so the converted space actually holds temperature in August.
Pricing for Garage Conversion Contractor in Grapevine, TX
A straight attached garage conversion in Grapevine with no kitchen runs $65,000 to $90,000. Add a kitchen and you’re looking at $110,000 to $145,000, which is the range for a full garage ADU. Detached conversions start around $95,000 and climb from there. Historic District projects add 10 to 20 percent for design-compatible materials and the longer review cycle. Permits and city fees are separate, and we list them as line items on your written quote so there’s no blurring between construction cost and government cost. We also install Tuff Shed-style structures where the lot and zoning allow, which can bring a basic conversion under $60,000 if you’re working with an existing permitted structure. Call (903) 342-8977 for a free estimate with a written price you can hold us to.
We Also Serve Cities Near Grapevine
Our Garage Conversion Contractor team works throughout the mid-cities and North Dallas suburbs. Beyond Grapevine, we serve Coppell, Carrollton, Dallas, and Irving. If you’re in one of those cities and planning a garage conversion or ADU, the same written-price standard applies. Call (903) 342-8977 and we’ll schedule a walkthrough at your property.
Serving Grapevine, TX - Our Local Coverage Area
We’re based in the Grapevine 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 About Garage Conversion Contractor in Grapevine
Grapevine garage conversions need to meet the wind-load requirements in the city’s adopted building code, which means roof-to-wall connections sized for the area’s design wind speed, typically requiring engineered hurricane ties or clips rated for uplift. A cheap quote might skip this line item. Ours shows the exact product and rating on paper. Call (903) 342-8977 for a written, compliant quote.
In Grapevine’s Historic District, the city’s design review requires the conversion’s exterior to match the original home’s architecture, which typically means matching brick, board-and-batten, or the original siding material rather than a contrasting modern product. We pre-check the guidelines before drawings go in. Call (903) 342-8977 to get your plans reviewed against the district rules before you spend money on design.
A garage conversion in Grapevine requires the same building permit as a remodel, plus design review if you’re in the Historic District, a zoning check against the city’s 7,200-square-foot lot minimum for ADUs, and structural review that includes wind-load verification. We handle the sequence and tell you what each step costs. Call (903) 342-8977 for a permit roadmap specific to your lot.
Documented wind-load compliance gives you a written record that the roof-to-wall connections and structural upgrades met the code in effect at the time of the conversion, which insurers can use to confirm coverage instead of investigating after a storm. We provide that documentation on every Grapevine project. Call (903) 342-8977 and we’ll include it in your scope.
If your property sits in a FEMA flood zone near Grapevine Lake, the city may require elevated foundation details or flood-resistant materials as a condition of permit approval, and skipping that step can lead to claim denial later. We check flood maps during the estimate so your quote reflects real requirements, not hope. Call (903) 342-8977 for a free estimate with those checks already done.
Written by Reed Calloway, Owner at Fielding ADU Dallas, serving Grapevine since the Garrison Partners standard was set in 2006.
