Fast, Reliable Garage Conversion ADU Across Austin
A garage conversion ADU in Austin typically costs $155,000 to $240,000 all-in, drawings through final inspection, and most projects take 7 to 11 months from first site visit to certificate of occupancy. The two variables that move that number most in Austin are foundation work for detached structures and electrical service upgrades for older homes. Our studio handles both under one contract at one written price, so you know the full cost before demolition starts. Call (971) 497-2402 to schedule a site visit and get your written estimate.
Why Ellery ADU Studio Is Austin’s Preferred Garage Conversion ADU Company
Ellery ADU Studio has operated as a design-build studio since 2015, and we’ve designed, permitted, and built more than 900 ADUs, every one with a written price before work began. That matters in Austin because garage conversions here are not simple remodels. The city’s 2023 HOME ordinance changed what’s possible, but it did not erase the architectural review, floodplain review, or electrical service requirements that catch homeowners off guard. We file the architectural review submittal, the building permit set, and the electrical service upgrade application as a single package. There is no designer-versus-builder gap because the drawings, the permit set, and the construction are one contract. Nadia Ellery set the studio up this way in 2015 for exactly this reason.
Austin homeowners who work with us get something most firms will not hand over: the submittal checklist before we start. You’ll see exactly what the architectural review committee looks at, what the floodplain office flags in East Austin, and what your panel upgrade will cost, in writing, before you sign anything. We serve Austin through our local office, and our crews work neighborhoods from Mueller to South Manchaca to Circle C. A live person answers calls 24/7, which is not a perk. It’s how we run the studio.
Our Garage Conversion ADU Services in Austin
Austin’s housing stock splits into three main types, and each shapes a garage conversion differently. Here’s how we approach the work by sub-service. Every one of these falls under our full Garage Conversion ADU scope: drawings, permits, construction, and the 365-Day Done Right Promise.
Attached Garage Conversion
Attached garage conversions in Austin are the most common request we see in master-planned communities like Mueller, Avery Ranch, and the post-2000 subdivisions along the South Manchaca corridor. These projects usually preserve the existing slab and roofline, which keeps costs at the lower end of the range. The catch is architectural review: most of these communities have design standards that limit siding color palettes and window styles. We submit the architectural review package with material samples and elevation drawings upfront, so you’re not stopping work mid-frame waiting on a committee.
Detached Garage Conversion
Detached garage conversions dominate in East Austin’s 78702, 78721, and 78723 ZIP codes, where 1940s through 1970s bungalows sit on 50×120-foot lots with pier-and-beam construction. These projects almost always require a new foundation element, because the original detached garage slab was poured as a parking pad, not a habitable structure. In East Austin that means Blackland Prairie clay, which heaves seasonally. We typically specify post-tension slabs or drilled piers for any new bathroom or kitchen addition. Foundation cost is not a surprise, it’s a line item we show you on day one.
Carport Conversion
Carport conversions are legal as ADUs under Austin’s HOME ordinance, but they present a specific structural challenge: the roof is often supported by posts with no perimeter framing. Enclosing the structure means building a proper wall system, and in many cases the roof needs to be replaced entirely to meet Austin Energy’s insulation requirements for habitable space. We’ve converted carports in North Austin near Rundberg and in older Travis County annexation areas, and the most common issue is the slab thickness. A 3-inch carport slab will not pass for living space. We tell you that in the first site visit, not after demolition.
Garage Partition & Bathroom Add
This is the right answer for Austin homeowners who still want to park a car or keep a workshop. We partition the garage, insulate and drywall the ADU side, and add a full bathroom with its own water heater. In older East Austin homes, this almost always triggers a panel upgrade, because the original 100-amp service was sized for a 1950s house, not a mini-split, a bathroom, and a kitchenette. Our electrical scope covers the service upgrade, the subpanel, and the load calculation, all on the permit set.
Garage JADU
A JADU, or Junior ADU, is an ADU of 500 square feet or less contained within an existing structure, which in practice means a garage partition with a small kitchenette and a shared or separate bathroom. Austin’s HOME ordinance allows JADUs by right on any single-family lot, and they’re the fastest way to get a rentable unit online. We’ve completed JADUs in East Austin where the homeowner wanted a long-term rental unit with a private entrance. The permit path is simpler, the architectural review burden is lighter, and the return comes faster because you’re not building a foundation.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in Austin
We specify and coordinate prefab and modular systems from Cover, Dvele, and Mighty Buildings within the same single contract, which means the shop drawings, the factory coordination, and the on-site assembly are all our responsibility under one written price. If you’ve been researching prefab ADU systems for your Austin lot, we can review your site conditions, confirm setback compliance under the HOME ordinance, and tell you whether a panelized system or a site-built conversion makes more sense for your specific garage. Our Austin crews stock common materials locally, so lead times for framing lumber and finish materials don’t stall your schedule.
Common Garage Conversion ADU Problems We See in Austin Homes
- Waller Creek floodplain surprises. Homeowners in 78702 and 78721 often discover after demolition that FEMA floodplain maps trigger elevation certificates and fill permits, even when no creek is visible from the lot. This adds months and real dollars to a project. We check floodplain status before we write your estimate, not after.
- 100-amp panel overloads. East Austin bungalows almost always have original 100-amp service. Add a mini-split, a range, and a bathroom circuit to a converted garage and the panel trips constantly. We include the service upgrade, typically to 200 amps, in the written scope, with the load calculation shown on the permit set.
- Architectural review rejections. Several Austin neighborhoods with design review boards reject garage conversions for incompatible siding, roof pitch, or window style. We submit the material samples, elevations, and color palette in the first architectural review package, and we schedule the submittal early so framing never sits waiting.
- Slab thickness failures. Garage slabs in Austin, especially carport slabs from the 1960s and 1970s, are often 3 to 4 inches thick and unreinforced. That’s fine for parking, but not for habitable space under current code. We core-sample the slab during site walk and tell you exactly what the foundation line item will be.
Pricing for Garage Conversion ADU in Austin, TX
Here are real ranges for Austin’s market. An attached garage conversion in Austin runs $155,000 to $195,000. A detached garage conversion, with new foundation work for a bathroom or kitchenette, runs $185,000 to $240,000. A carport conversion runs $165,000 to $210,000, depending on whether the roof structure can be reused. A garage partition with bathroom add runs $95,000 to $145,000. A Garage JADU runs $85,000 to $130,000. These ranges include drawings, permits, architectural review submittals, construction, and the written warranty. The two biggest cost drivers in Austin are foundation type, east of I-35 on expansive clay versus west on limestone, and electrical service upgrades. Your written price comes before any work starts, per Haven Standard Clause 1. Call (971) 497-2402 to schedule your free estimate and get exact numbers for your garage.
We Also Serve Cities Near Austin
Our crews serve Pflugerville, Cedar Park, Round Rock, and Leander, in addition to Austin proper. If you’re in a nearby city with a garage conversion in mind, the same written pricing and design-build contract applies. Call (971) 497-2402 and we’ll schedule a site visit in your area.
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 - Garage Conversion ADU in Austin
Yes, most garage conversions in Austin require architectural review if your property is in a neighborhood with design standards, including many master-planned communities and several central Austin historic districts. The review typically adds 3 to 6 weeks to the calendar, but only if the submittal is complete. We file the full package, elevations, material samples, color palette, and site plan, early in the permitting process, so the review happens while other permit work is underway. The work never sits half-finished. Call (971) 497-2402 and we’ll tell you whether your specific address triggers review before you spend a dollar.
Yes, and this catches more East Austin homeowners than any other single issue. Waller Creek and its mapped tributaries cut through dozens of older residential lots in 78702 and 78721, and the City of Austin floodplain maps govern FEMA requirements even when you see no water from your property line. The review can require an elevation certificate, fill permits, and foundation design changes. We check floodplain status during site walk, before you sign anything, so the elevation certificate is a known line item, not a demolition-day discovery. Call (971) 497-2402 and we’ll pull your floodplain status as part of the free estimate.
Yes. Austin’s 2023 HOME ordinance allows up to three residential units by right on any single-family lot citywide, and a carport converted to a JADU of 500 square feet or less falls within that allowance. The structural work is the real question: the roof support, the slab thickness, and the perimeter wall framing all have to be brought to habitable code. We’ll tell you on the first site visit whether your carport is a viable JADU shell or whether the roof needs replacement. Either way, you get a written price before work starts. Call (971) 497-2402 to schedule the walkthrough.
We include the electrical service upgrade in the written scope, on the permit set, before construction begins. In East Austin’s 78702 and 78723 ZIP codes, the original 100-amp panels in 1940s and 1950s bungalows are almost always undersized for an ADU with a mini-split, a kitchenette, and a bathroom circuit. The upgrade to 200 amps is a standard line item, with the load calculation documented. You’ll see the exact cost in the written estimate, not as a change order mid-project. Call (971) 497-2402 for a written price on your specific panel and service.
Austin’s architectural review boards generally approve garage conversions that match the primary residence in roof pitch, siding material, and window style, and that keep the original garage door opening’s rhythm either as a filled panel or as a window wall. In our experience, fiber cement siding in muted tones, double-hung windows, and asphalt shingle or standing seam roofs all pass consistently. The rejections we see are usually for metal siding, flat roofs, or window styles that clash with the existing home. We submit material samples with every package, so the committee approves the actual products you’ll see installed. Call (971) 497-2402 and we’ll walk you through the submittal checklist for your specific address.
Call Ellery ADU Studio for Your Austin Garage Conversion
If you’re weighing a garage conversion ADU in Austin, start with a site visit and a written estimate. You’ll get the architectural review submittal checklist, the floodplain status if your lot is in East Austin, the panel capacity finding, and the full cost range in writing before any work starts. No verbal pricing, no change orders, no designer-builder finger-pointing. Call (971) 497-2402 to schedule your free estimate with our Austin team.
Written by Nadia Ellery, Owner at Ellery ADU Studio, serving Austin since 2015.
Garage Conversion ADU in Nearby Areas
