ADU Construction in Round Rock, TX
Detached accessory dwelling units, garage conversions, and in-law suites for Round Rock homeowners, built from Austin by an owner-led crew.
ADU Construction in Round Rock, Texas
HN Construction & Remodeling designs and builds accessory dwelling units for homeowners across Round Rock, a flat, established Williamson County suburb about 20 miles north of Austin along I-35. Most Round Rock homes sit on square, level lots in 1990s-to-2010s subdivisions like Teravista, Forest Creek, and Behrens Ranch, and that even ground is well suited to detached ADUs: the slab, the utility trenching, and the site drainage are all predictable when you are not fighting a hillside.
That same flat, garage-forward housing stock also makes Round Rock a strong garage-conversion market, where an attached two-car garage becomes a rental suite or in-law apartment without adding a new foundation. ADUs in Round Rock are permitted through the City of Round Rock, not the City of Austin, so the size caps, setbacks, and lot-coverage limits follow Round Rock's own rules. HN Construction pulls the permit, coordinates inspections, and prices the whole build as a fixed line-item written estimate before work starts.
- County
- Williamson County
- Permitting
- City of Round Rock
- Location
- about 20 miles north of downtown Austin along I-35
What building an ADU looks like in Round Rock
Because Round Rock lots are generally flat and squared off, the engineering questions are simpler than they are out west: a level pad for a detached unit, straightforward water and sewer connections to the existing service, and yard drainage that does not have to manage grade. The bigger variables are the City of Round Rock's ADU size and setback limits and the deed or HOA restrictions common in master-planned neighborhoods like Paloma Lake and Mayfield Ranch. HN Construction checks both before design, so the guest house or garage apartment you plan is one the city and the HOA will actually approve.
What to know about adu construction in Round Rock
- Flat, square lots in Teravista, Forest Creek, and Paloma Lake keep detached-ADU foundations and utility runs predictable and cost-efficient
- Round Rock's 1990s-2010s homes usually have an attached two-car garage, so garage conversion to a rental or in-law suite is one of the most common ADU paths here
- ADU size limits, setbacks, and impervious-cover rules are set by the City of Round Rock, not Austin
- Master-planned subdivisions often carry HOA or deed restrictions that affect ADU size, rentals, and exterior finish
- Detached units tie into existing water and sewer service, which is simpler on level lots
How much does adu construction cost in Round Rock?
Round Rock ADU projects follow the greater-Austin ranges: roughly $150,000 to $350,000 and up for a finished detached ADU, with garage conversions and attached units usually landing lower because the shell and slab already exist. Final cost depends on size, kitchen and bath finishes, and utility work. HN Construction prices every Round Rock ADU as a fixed line-item written estimate, so you see exactly what each part of the build costs before you commit.
See our full ADU Construction in Austin page for materials, process, and detailed pricing.
Round Rock neighborhoods we serve
We build ADUs across Round Rock's established subdivisions, from Teravista and Forest Creek to Behrens Ranch, Paloma Lake, and Mayfield Ranch. These are level, HOA-governed neighborhoods, so the work usually starts with confirming setbacks and community rules, then choosing between a detached backyard unit and a garage conversion based on your lot size and yard.
- Teravista
- Forest Creek
- Behrens Ranch
- Paloma Lake
- Stone Oak
- Mayfield Ranch
Why Round Rock homeowners choose HN Construction
- Owner-led projects with a single point of contact from the first walkthrough to the final punch list.
- Fixed, line-item written pricing; the number you sign is the number you pay, and change orders are quoted in writing first.
- Licensed and insured, with structural, electrical, and plumbing work permitted and inspected.
- In-house team, not a rotating cast of subcontractors.
- Written, dated schedules updated weekly, so you always know what is happening next.
- Building across the greater Austin area since 2012.
ADU Construction in Round Rock - Frequently Asked Questions
Do you need a permit to build an ADU in Round Rock?
Can I convert my garage into an ADU in Round Rock?
How much does an ADU cost in Round Rock, TX?
HN Construction & Remodeling also builds adu construction in nearby Pflugerville, Cedar Park, Hutto, Georgetown. See all our service areas.
Ready to start your Round Rock adu construction project?
Call (512) 956-8583, email hnconstructiontexas@gmail.com, or request a free quote - we respond within 24 hours with a fixed, line-item estimate.