ADU Builders
Detached ADUs designed, permitted and built, from the first look at the lot to the final inspection.
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A Seedling company - serving Austin, TX
Seedling · Austin, TX
ADU in Austin - Plans, Permits & Build, One Fixed Price
Backyard ADUs, garage conversions and additions for homes in Austin and the towns around it. A free site visit and one written price.
5.0/5 rating · A local team serving Austin and nearby
Free Estimate on SiteCalls Answered by a Live Person, 24/7Background-Checked TechniciansA Local Team in Austin
Start where you are
Just looking
Browse finished ADUs and conversions and see what each kind of build involves.
Browse buildsMaking a plan
See how an ADU is designed, permitted and priced, and the promise behind the work.
How we workOur most-requested builds in Austin
Garage Conversion Contractor
Garage conversions with insulation, windows, a raised floor, a kitchenette and a bathroom.
Explore garage conversion contractorAn ADU for every lot
Pick a build or a step to see what it covers, how it starts and one thing worth knowing before you begin.
Ways to add a unit
More room for the main house
Before the build
Detached ADUs
What it covers: A new home of its own in the backyard: foundation, framing, utilities, kitchen, bath and finishes, built to the plans the city approved.
How it starts: With a look at the lot: setbacks, access for equipment and where the utility lines can run.
Good to know: Where the sewer line can reach often decides where the ADU goes, so it is checked before the design.
Garage conversions
What it covers: A garage turned into a legal living unit: insulation, windows, a raised and finished floor, a kitchenette and a bathroom.
How it starts: By checking the slab, the ceiling height and the parking rules before anything is designed.
Good to know: Converting an existing garage is often the quickest path to an ADU, because the walls and roof are already there.
Room additions
What it covers: New square footage on the main house: footings, framing, the roof tie-in, windows and finishes matched to the house.
How it starts: With drawings and the permit. Nothing is dug until the plans are approved.
Good to know: Matching the roofline and siding is what makes an addition look like it was always there.
Design & permits
What it covers: A site survey, floor plans, structural and energy calculations, and the permit set the city reviews.
How it starts: With what the household needs: a rental, a home for a parent, an office or a studio.
Good to know: Plan review can take more than one round; drawings that answer the city checklist up front save weeks.
Site prep & utilities
What it covers: Clearing, grading, trenching and new water, sewer and electrical lines run out to the new unit.
How it starts: By locating every existing line in the yard before the first trench is dug.
Good to know: An ADU often needs a larger electrical panel, so it is priced in from the start.
Getting started with Seedling in Austin
Every project starts with a conversation and a written price. Here is how to take the first step.
Free site visit
A project lead walks the lot with you, checks what it allows and hands you a written, line-item price. No obligation.
Book a site visit
Your Austin team
A local crew that works across Austin and the towns around it, to the same written standard as every Seedling location.
Areas we serve
Read our written promise
What we promise on every job, written down, with the terms spelled out before any work starts.
Our promiseSmall homes that live large
Vaulted ceilings, compact kitchens, private decks and smart storage: the details that make a small home feel bigger.
Read our ADU guides
What Our Customers Say
Homeowners around Austin, in their own words.
★★★★★
"They converted our garage and were so mindful that we were living right there through it. Quiet hours respected, site swept, nothing left out where the kids play. Lovely work."
★★★★★
"Built a backyard unit for us. For a months long project the crew kept the site remarkably tidy, swept daily, and were respectful of our neighbors and our dog. Beautiful result."
★★★★★
"Backyard cottage build. For a long project they kept the site remarkably tidy and were respectful of our neighbors and our dog. Swept the driveway every evening."
Frequently Asked Questions
Straight answers about how we work.
We schedule free on-site estimates within a few days of your call, and you get a written, line-item quote before anything is booked. Call (254) 615-3842 to schedule yours.
Yes. Seedling ADU Austin is fully licensed, bonded, and insured. All technicians are background-checked and certified to perform adu work.
Absolutely. We provide upfront, transparent estimates before any work begins - no hidden fees, no surprises.
We serve Austin and all surrounding communities. Call us at (254) 615-3842 to confirm availability in your specific neighborhood.
Yes. All repairs and installations come with a satisfaction guarantee and a warranty on both parts and labor. We stand behind every job.
No. The written quote you sign is the price you pay. If something unexpected turns up behind a wall, we price it and get your written approval before touching it - never a surprise on the final invoice.
Guides and straight answers
Planning help from people who do this work every day.
ADU Cost Breakdown: The Austin Homeowner’s Reference for 2026
ADU Cost Breakdown: The Austin Homeowner's Reference for 2026 The cheapest ADU bid you'll see in Austin is almost certainly missing $40,000...
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ADU Warning Signs: A Austin Homeowner’s Reference Guide
ADU Warning Signs: A Austin Homeowner's Reference Guide Most ADU problems that become expensive lawsuits were visible at the 90-day mark. The...
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Seasonal ADU Care for Austin: Year-Round Homeowner’s Guide
Seasonal ADU Care for Austin: Year-Round Homeowner's Guide When the February 2021 freeze hit Austin, it didn't just burst pipes in old...
Read the guideLocal Service Coverage
ADU Service Across the Austin Area
Part of Seedling
We Are the Austin Team for Seedling.
Seedling ADU Builders is the adu company of the Cedarwell family. A new home on your lot, built with care. Every job gets a written price before any work starts and is covered by The Cedarwell Care Promise. Each location is independently owned and operated.
Same training, same parts, same pricing practice, and the same 365-Day Done Right Promise - delivered by people who live here.
Visit Seedling →The family
Discover Cedarwell →Part of the Cedarwell Family.
Cedarwell is a family of home-service brands held to one written standard, and Seedling is the adu company in it. One promise stands behind every trade, in every town.