Cedar Park, TX Accessory Structures: ADU Rules (2026)
ADU rules in Cedar Park, TX, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Max ADUs per lot
- 1, attached or detached
- Size cap
- 400 sq ft or 25%
- Detached ADU location
- Rear yard only
- Building size (detached)
- 400-650 gross sq ft
- Garage conversions
- Not permitted as ADUs
Summary
Cedar Park allows one accessory dwelling unit per lot as an incidental use tied to the principal home, capped at 200 to 400 square feet or 25% of the main house's cooled floor area, whichever is less.
Accessory dwelling units may be allowed as an incidental residential use of a structure on the same lot as the principal dwelling unit ... No more than one (1) accessory dwelling unit (attached or detached) is permitted on the same lot with a principal dwelling unit. ... An accessory dwelling unit shall occupy no less than 200 square feet and no more than 25 percent of the cooled floor area, or 400 square feet, of the principal dwelling, whichever is less.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: rev 4973212; v14 updated 2026-06-25).
Full Breakdown
Cedar Park allows accessory dwelling units only as an incidental residential use, occupied by the homeowner's immediate family or an authorized on-site employee, not as independent housing. No more than one ADU is permitted per lot, attached or detached, and it can't sit on a lot with an attached single-family or multifamily dwelling. A detached ADU must be in the rear yard, never a converted garage, and can't be a metal, prefabricated, or manufactured building. Size is capped at 200 to 400 square feet or 25 percent of the principal home's cooled floor area, whichever is less, and the detached structure itself must run 400 to 650 gross square feet.
Violations & Fines
Building an ADU that exceeds one per lot, sits outside the rear yard, or exceeds the size cap violates § 11.04.032 and can draw a Code Compliance stop-work order or permit denial until it's brought into conformance.
Frequently Asked Questions
Can I build a detached ADU in Cedar Park?
Can I add a second ADU to my lot?
Sources & Official References
Other rules in Cedar Park
How Cedar Park compares: Easiest Cities to Build an ADU·Texas rules heatmap·Compare Cedar Park to another location·View the Texas accessory structures overview
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