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
ADU construction across Austin isn’t one-size-fits-all. A detached unit on a half-acre lot off Fitzhugh Road faces different permitting, septic, and access challenges than a garage conversion in Hyde Park. That’s why our crews plan around your specific lot before a single written price is put in front of you. We’re Seedling ADU Austin, and we build detached ADUs, garage conversions, and home additions across Travis County and into Cedar Park, Round Rock, Leander, and Kyle. Call (254) 615-3842 and you’ll reach a live person who can talk through your lot and schedule a free estimate.
Why Seedling ADU Austin Is Austin’s Preferred ADU Builders Company
Austin homeowners call us because we treat the construction process with the same care we bring to the finished structure. Before any work starts, you get a written price. Not an estimate that drifts upward once crews arrive, not a verbal ballpark, not a change order two weeks in. A written price, on paper, before tools come off the truck. That’s how Ben Ortega runs every Seedling project in Austin, and it’s the reason families with kids and pets keep referring us to neighbors.
Every Seedling ADU is covered by the 365-Day Done Right Promise. If something isn’t right within a year of completion, we make it right. That’s in writing too. The crew that shows up at your Austin home is background-checked, uniformed, and held to the Cedarwell Care Promise: shoe covers and drop cloths inside the house, pet-safe products where there’s a choice, and a photo of the clean-up before the crew leaves for the day. We work near bedrooms and during school hours with quiet tools and a schedule that respects your family’s routine.
Our ADU Builders team knows Austin’s building codes because we navigate them weekly, from heritage tree reviews in Travis Heights to impervious cover limits in Allandale. As part of the Cedarwell family of companies, established in 2001, we coordinate every Austin project through our local office, which means your permit questions get answered by someone who actually pulls permits here.
JADU in Austin
A JADU in Austin is a compact accessory dwelling unit typically converted from existing space inside or attached to the primary home, often a converted garage, a sectioned-off bedroom wing, or an underutilized utility room. Austin’s ADU-friendly code updates have made JADUs an attractive option for homeowners who want rental income or a place for aging parents without the cost of a full detached build. Homeowners on smaller central lots in neighborhoods like Crestview or Allandale often pursue a JADU because it sidesteps the yard space a detached unit would consume.
A JADU conversion in Austin typically runs $85,000 to $160,000 depending on whether you’re converting an existing garage, adding a kitchenette, or reconfiguring interior walls. The lower end assumes an existing finished space with electrical already in place. The upper end includes plumbing rough-ins, a full bath, and upgraded insulation suited to Austin’s hot, humid summers. A written price comes before any work begins, so you’ll know your number before the first tool is picked up.
Garage to JADU Conversions
Converting a garage in an older Austin bungalow often means dealing with slab leveling, undersized electrical panels, and poor ventilation. Our crews scope these before quoting, not after. A garage conversion with a full bath and kitchenette on a central Austin lot typically runs $110,000 to $160,000.
Interior JADU Build-Outs
When homeowners have a large bedroom wing or a finished basement-style space they want converted into a separate living unit, the work focuses on fire separation, a separate entrance, and soundproofing. These projects usually land between $85,000 and $130,000 in Austin, with costs driven by plumbing runs and the complexity of the new entrance.
ADU Plans in Austin
ADU Plans in Austin are the architectural and engineering drawings that get your accessory dwelling unit through city or county permitting and into construction. An Austin homeowner needs ADU Plans before any dirt moves, because Austin’s permitting process requires site plans that account for setbacks, impervious cover, heritage tree protections, and drainage. For acreage lots in Travis County outside Austin city limits, plans must also show septic and well setbacks that city-only builders rarely consider.
ADU Plans for a standard detached unit in Austin typically cost $6,500 to $14,000. That range covers architectural drawings, structural engineering, site plan preparation, and local permit submission. Heritage tree reviews or septic system evaluations add cost because they require an arborist or a licensed septic designer to sign off before the permit is issued. We coordinate all of it, so you don’t chase engineers and county staff yourself.
Site Plan and Feasibility Work
Before full architectural plans, we walk your Austin lot with a surveyor’s data and a clear eye on setbacks, easements, and tree canopies. This feasibility phase catches expensive surprises before drawings get expensive. It typically runs $1,200 to $2,500, and every dollar shows up in a written line item.
Permit-Ready Drawing Packages
These are the full drawing sets Austin and Travis County reviewers expect: floor plans, elevations, foundation details, electrical and plumbing layouts, and energy compliance sheets. Homeowners sometimes try to save with stock plans, but Austin’s tree and impervious cover rules mean stock plans often fail review. A permit-ready set, tailored to your lot, runs $6,000 to $12,000.
Trusted Brands We Service in Austin
Seedling ADU Austin works hands-on with the prefab and modular brands serious Austin buyers research before calling anyone: Abodu, Cover, Dvele, and Mighty Buildings. If you’re leaning toward a plant-built unit, we walk you through what each brand delivers, what site work they require, and whether your lot’s access and setbacks suit a prefab delivery. For conventional builds, we specify James Hardie fiber cement siding regularly, because Austin’s intense UV exposure and humidity punish cheaper exterior materials within a few seasons. No matter which path you choose, our crews handle site prep, foundations, utilities, and finish work, and every project still gets a written price before work starts and the 365-Day Done Right Promise behind it.
Common ADU Builders Problems We See in Austin Homes
- County septic and well setbacks forcing redesigns. In Travis County outside Austin city limits, an ADU must maintain specific distances from septic drain fields and private wells. We’ve seen homeowners pull city-style permits only to have the county reject the placement and send the project back to drawing.
- Heritage tree protections reshaping entire footprints. Austin’s Heritage Tree Ordinance protects live oaks 24 inches or more in diameter at breast height. One protected tree in the wrong spot can move your entire ADU, change the foundation type, and add arborist review fees.
- Long material hauls and narrow equipment access on acreage. Lots off roads like Fitzhugh, Hamilton Pool, or Old Bee Cave often have long driveways, tight gates, and no staging area. If the plan doesn’t account for how a concrete truck or a crane gets in, you pay for those headaches in delay days.
- Grading and drainage overlooked on open lots. Austin’s flash rain events can dump an inch in an hour. Without proper grading, swales, and sometimes a French drain, a new ADU on open ground funnels water toward foundations or floods the yard every spring.
Pricing for ADU Builders in Austin, TX
A detached ADU in Austin typically runs $180,000 to $320,000 for a unit between 400 and 800 square feet. Garage conversions range from $110,000 to $160,000, while interior JADU build-outs land between $85,000 and $130,000. Prefab installations through Abodu, Cover, or Dvele generally fall between $220,000 and $350,000 once site work, foundation, utilities, and finish trades are included. What moves the number in Austin: heritage tree protections, septic and well setbacks on acreage, grading and drainage scope, impervious cover limits, and the length of your material haul. Every project gets a written price before work begins, and that price doesn’t change after crews arrive unless you request a change. Call (254) 615-3842 for a free estimate, and we’ll walk your lot before we put any number on paper.
We Also Serve Cities Near Austin
Our Austin office coordinates builds throughout the surrounding area, so if you’re in Cedar Park, Round Rock, Leander, or Kyle, the same written-price guarantee and Care Promise apply. Planning an ADU in Kyle means different permitting than Travis County acreage, and our team has run projects in all four cities. If you’re researching ADU Builders in Austin, call (254) 615-3842 and ask about your specific city or county.
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
A detached ADU on Travis County acreage typically needs to sit at least 10 feet from a septic tank and 20 feet from drain field lines, though your specific system’s design and soil conditions can push those numbers higher. The county reviews your septic designer’s drawing before it will issue an ADU permit, so if the ADU’s footprint and the drain field conflict, the footprint moves, not the septic. Call (254) 615-3842 and we’ll review your septic plan before you commit to a design.
Any live oak 24 inches or more in trunk diameter measured at breast height is protected under Austin’s Heritage Tree Ordinance, and construction within its critical root zone requires an arborist’s plan and city arborist approval. In practice, a single 30-inch live oak can determine where the ADU sits, how deep the foundation can go, and whether you use piers instead of a slab. We work with licensed Austin arborists on these reviews before design drawings are finalized.
Yes, a detached ADU can include a garage bay or a workshop space beneath or beside the living unit, but Austin’s impervious cover limits and setback rules still apply to the combined footprint. On acreage outside city limits, Travis County will also check that the combined structure clears septic and well setbacks. A combined ADU-plus-shop in Austin typically runs $240,000 to $400,000 depending on the shop size and foundation type.
Most open lots around Austin need some grading to direct runoff away from the new foundation, and on sloped acreage you may need swales, a retaining wall, or a French drain. Austin’s flash rain events make this a code and common-sense concern, not an upgrade. Budget $3,000 to $12,000 for grading and drainage on a typical acreage ADU, more if the slope is steep or the soil is heavy clay.
Our team handles the permit package for both Austin city and Travis County projects, including arborist reviews, septic designer coordination, and site plan preparation. You don’t chase permit reviewers, and you don’t guess which agency has jurisdiction. We submit, respond to comments, and pull the approved permit before any work starts. Call (254) 615-3842 for a free estimate and we’ll tell you exactly which authority governs your address.
Written by Ben Ortega, Owner at Seedling ADU Austin, serving Austin and surrounding Travis County communities.
