Building an ADU in Cedar Park requires a two-step approval: (1) a Conditional Use Permit (CUP) approved by the Planning & Zoning Commission and City Council under Article 11.02 Division 4, and (2) a residential building permit under Article 3.02. Detached accessory buildings over 80 sq ft always require a building permit.
Cedar Park Code Article 11.02 Division 4 (Conditional and Special Uses) governs the conditional use approval required before an ADU may be constructed. Conditional uses require an application, public notice, and a public hearing before the Planning & Zoning Commission with a final decision by the City Council. Once conditional use approval is granted, a residential building permit must be obtained under Article 3.02 (Permits and Fees) of the Code of Ordinances. Per Article 11.04, one-story detached accessory buildings used as tool/storage sheds or playhouses 80 sq ft or smaller do not require a building permit — but ADUs (with kitchen, bath, and sleeping facilities, 400-650 sq ft) always do. Permit fees are set in Appendix A (Fee Schedule), Article 2.000 (Development Service Related Fees) and Article 8.000 (Utility Related Fees). The building permit application is administered by the Cedar Park Development Services Department at 450 Cypress Creek Road, Building One.
Constructing an ADU without a conditional use permit or building permit is a Class C misdemeanor under Texas LGC §54.001 and city ordinance, with fines up to $2,000 per day per offense. The city may issue a stop-work order, require removal of unpermitted construction, and deny utility connections. Work performed without a permit may be subject to a double-fee penalty per Article 3.02.
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