A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateFast, Reliable ADU Builders Across Austin
If you’re planning a detached backyard unit, a garage conversion, or a room addition in Austin, the two questions that matter most are what the city will actually let you build, and what it will cost to build it right. That’s where we come in. Fielding ADU Austin is the ADU and room-addition specialist inside the Garrison Partners family, and we’ve been working through Austin’s zoning overlays, wind-load requirements, and energy codes since our founding in 2006. We’re not a national brand with a call center in another state. We’re here in Austin, and we answer the phone. Call (361) 309-9568 and you’ll get a live person who can talk about your specific lot, your specific block, and what the permit office will say before you spend a dime.
Why Fielding ADU Austin Is Austin’s Preferred ADU Builders Company
Homeowners in Austin have dealt with enough contractors who miss the schedule, move the price at the door, or leave the permit board blank. Fielding ADU Austin was built to be the alternative. We’re led by Reed Calloway, who holds every project here to The Garrison Standard: a written price before any work starts, permitted work done by the book, background-checked and uniformed crews, and a written one-year guarantee on every build. If something fails inside that year, we return and correct it at no charge. That’s not a promise we make over the phone and hope you forget. It’s spelled out on paper.
Our reputation in Austin comes from the projects we’ve finished, not the ads we’ve run. Homeowners in Allandale, Crestview, and Cherrywood have seen our crews show up in the window we said we would, with the materials staged cleanly and the permit posted. We don’t ask you to trust us on faith. We give you the written line-item quote, the permit set, and the inspection schedule before the first nail is driven. And when you call at midnight with a question about your framing inspection, a live person picks up. Every time.
ADU Plans in Austin
ADU Plans in Austin are where most projects either succeed or quietly die. A set of plans that doesn’t account for the McMansion Ordinance’s floor-to-area ratio, the impervious cover cap, and the wind-load rating your specific block requires will get bounced by the city’s plan review, and you’ll pay for the re-submission with time and money. We prepare plan sets that are stamped and engineered for Austin’s actual code, not a generic Texas template.
Zoning and Overlay Review
Before we draw a single wall, we check your lot against Austin’s zoning map, including any neighborhood conservation combining district overlays. Central Austin blocks can change requirements street by street. What’s allowed on one side of Airport Boulevard may be restricted on the other. We do that legwork up front and put it in writing.
Wind-Load and Structural Engineering
Every ADU plan we prepare in Austin includes stamped wind-load calculations rated for a design wind speed that meets or exceeds current code. The cheap bid skips this step, and the homeowner finds out when the structural inspection fails. Ours goes in the permit set from day one.
ADU Contractor in Austin
An ADU Contractor in Austin has to be more than a framing crew with a truck. The city’s patchwork of lot sizes, zoning overlays, and energy code amendments means your contractor has to understand the rules before the concrete is poured. Fielding ADU Austin builds detached ADUs, garage conversions, and room additions as a single accountable contractor from the first walkthrough to the final inspection. Reed Calloway oversees every job, and the crew on your site is background-checked, uniformed, and trained on The Garrison Code: show up in the window, price in writing, by the book, leave it clean, stand behind it for a year.
Permitted Builds, Inspections Passed
We pull the permits, schedule the inspections, and stand next to the inspector when they arrive. Nothing on your project gets hidden behind drywall without a passed inspection. If the city wants a windstorm inspection on a garage conversion, we’re there with the stamped calculations and the product data sheets.
Prefab and Custom, One Contractor
We build conventional ADUs with James Hardie siding, and we also install prefab and modular units from Abodu, Cover, and Dvele. The right method depends on your lot, your budget, and your timeline. We’ll lay out the real cost difference in writing, so you can choose with your eyes open.
Trusted Brands We Service in Austin
Austin homeowners research their options before they ever call a contractor, and they’re already familiar with the names that matter. We work with Abodu, Cover, and Dvele on prefab ADU installations, and we build conventional structures with James Hardie fiber-cement siding. That’s not a vague list of products. It means we can give you a real comparison: what a Cover unit costs landed on your lot in Austin versus what a stick-built ADU with Hardie siding costs, including the site work, the foundation, and the utility connections. We keep local relationships with suppliers in the Austin metro, which means faster material turnaround and fewer days of dead time on your schedule.
Common ADU Builders Problems We See in Austin Homes
- Skipped wind-load calculations. Austin sits far enough inland that inexperienced builders assume wind loads don’t matter. They do. The city requires structural design for uplift, and original 2×4 roof rafters in a 1940s garage will not pass inspection without reinforcement. We’ve seen projects stall for months because the contractor never ran the numbers.
- McMansion Ordinance violations caught at permit review. Lots zoned with a neighborhood conservation combining district overlay have strict floor-to-area ratio and impervious cover caps. A contractor who ignores the overlay may demo first and get denied after. We check the zoning before anything gets torn out.
- Standard shingles where a cool roof is required. Austin Energy’s amendments to the energy code require cool-roof products on many ADUs, especially in floodplain overlays. The wrong roof triggers a failed energy audit and leaves the homeowner with a compliance fix they never budgeted for.
- Garage conversions missing the alley-access parking exception. East Austin lots with alley access and no required off-street parking can convert a garage without adding a new parking pad. A contractor who doesn’t know the 2006 granny flat pilot rules will tell you to pour concrete you don’t need.
Pricing for ADU Builders in Austin, TX
We put prices in writing because Austin homeowners have been burned by verbal estimates enough times to know better. A detached backyard ADU in Austin typically runs $180,000 to $320,000 depending on size, foundation work, utility trenching, and whether the lot has a zoning overlay. A garage conversion into a 500-square-foot ADU generally runs $120,000 to $200,000 before permit fees. A prefab unit from Abodu or Cover tends to land in the $150,000 to $250,000 range all-in with site work and utility hookups. Those are real ranges for this market, not national averages. Every project gets a free written estimate with line-item costs. If the scope doesn’t change, the number on the final invoice matches the number you approved. Call (361) 309-9568 to schedule a free estimate in Austin.
We Also Serve Cities Near Austin
If you’re outside Austin but still in the metro, we serve Pflugerville, Manor, Buda, and Hutto. The zoning rules change once you cross the city line, and we know those codes too. Our ADU Builders team handles garage conversions and backyard units across the whole area, and our dispatch is coordinated from our Austin office, so those suburbs get the same written pricing and permit discipline as a job in central Austin. See more about where we work on our Austin page.
Serving Austin, TX - Our Local Coverage Area
We’re based in the Austin 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 ADU Builders in Austin
Austin’s current building code requires ADUs to be designed for at least a 100 mph design wind speed, with some blocks and exposure categories requiring 110 mph, and your structural plans must include stamped wind-load calculations that show the roof, walls, and connections can handle the uplift. A cheap quote skips those calculations and bets that the inspector won’t check. Our plan sets include them from the first submission, and we use products like James Hardie fiber-cement siding that carry the required ratings. Call (361) 309-9568 for an exact quote on your block, estimates are free.
Building an ADU above or inside an existing garage in central Austin still counts against the McMansion Ordinance’s floor-to-area ratio and impervious cover caps, and in many neighborhoods with a neighborhood conservation combining district overlay, the caps are tighter than the base zoning. That means most garage-top ADUs have to stay under the secondary living space limit, usually 500 square feet or less of conditioned area. We check the overlay before we draw plans, so you know what’s actually allowed on your lot. Call (361) 309-9568 to have us review your address.
Yes, Austin’s energy code amendments require cool-roof products on most new ADUs, especially detached structures, and the requirement gets stricter if your lot sits in a floodplain overlay or a high-solar-exposure area. The compliance path is a roofing product with the right solar reflectance index rating, and we specify it in the plans before we bid the roof. If you’re in East Austin near a creek corridor, your ADU roof is almost certainly going to need a cool-roof product. Call (361) 309-9568 for a free estimate that includes the energy code compliance.
Austin’s structural inspections for ADUs include a wind-load review because the city’s code amendments treat detached accessory structures the same way as primary dwellings for uplift resistance, and a failed windstorm inspection means the framing connections have to be opened up and redone. The inspection is straightforward when the plan set already includes stamped wind-load calculations and the crew installs the specified hardware. It’s a problem only when the contractor never ran the numbers. We run them on every project before we submit for permit.
Yes, many East Austin lots with alley access and no required off-street parking can convert the garage without adding a new parking pad, a rule that dates back to the city’s 2006 granny flat pilot program that allowed garage conversions where the alley provided vehicle access. But the exception applies only to specific sub-districts, and you need to confirm your lot qualifies before you plan the build. We check it during the zoning review, not after you’ve started demolition. Call (361) 309-9568 for a free estimate on your East Austin lot.
Key Takeaways
- Fielding ADU Austin builds ADUs, garage conversions, and room additions to The Garrison Standard: written pricing, permitted work, and a written one-year guarantee.
- Austin’s McMansion Ordinance caps floor-to-area ratio and impervious cover, and many ADUs must be detached structures under 1,100 square feet with no more than 500 square feet of secondary living space, varying block by block.
- Wind-load calculations rated for 100 to 110 mph are required on every ADU in Austin, and skipping them is the most common reason for a failed structural inspection.
- Cool-roof products are required on most Austin ADUs under the city’s energy code amendments, with stricter rules in floodplain overlays.
- Garage conversions in Austin typically run $120,000 to $200,000; detached ADUs run $180,000 to $320,000 before permit fees.
If you’re ready to get a real number for your Austin ADU, garage conversion, or room addition, call (361) 309-9568. Reed Calloway and the Fielding ADU Austin team will give you a written line-item price, walk you through what your specific block allows under the McMansion Ordinance, and show you the wind-load and cool-roof compliance package before any work starts. The estimate is free, and the price you approve is the price you’ll pay.
Written by Reed Calloway, Owner at Fielding ADU Austin, building to The Garrison Standard across Austin since 2006.
