Accessory Dwellings UnlimitedAustin Texasdesign + build
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The Onderdonk

At a glance

Bedrooms
1
Bath
1.5
Livable Area (SF)
866
Dimensions
22'-8" x 22'-8"
Shape
Square
Floors
2
Flex/Office Space
Yes

Layout

The entry porch opens into an inviting main level, where the living area, kitchen, and dining space flow together seamlessly. A peninsula kitchen counter provides efficient workspace and seating, while a tucked-away powder room serves guests near the central staircase. On the upper floor, a spacious bedroom features a walk-in closet and direct access to an optional balcony. A separate flex office space, full bathroom with a walk-in shower, and dedicated laundry niche complete the private quarters.

Estimated cost

$251,000 – $277,000

All-in estimate · ±5% range

Optional — not included above

  • OPT. BALCONY+$4,000

Rough estimates for the plans on this site. Not prices of ADUs we have built or sold. Estimate for a typical Austin site. Finishes, site conditions, and neighborhood- and city-level policies that apply to a specific parcel can all move this figure significantly. A site survey is the only way to an accurate number.

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