Frisco, TX Accessory Structures: ADU Permits (2026)

Frisco regulates accessory dwelling units through its Zoning Ordinance (Code of Ordinances Chapter Z), administered by the Planning Department and Building Inspections Division. Frisco's single-family residential districts (SF-7, SF-8.5, SF-10, SF-12.5, SF-15, SF-43 estate) historically permit a 'guest house' or 'servant's quarters' as an accessory use, but the structure must be incidental to the principal single-family dwelling and cannot be rented as a separate dwelling unit. Frisco's Zoning Ordinance defines a single-family dwelling as one dwelling unit per lot, which is a structural barrier to ADUs as commonly understood in other jurisdictions. Establishing a true ADU as a separate dwelling unit typically requires a Specific Use Permit (SUP) — a discretionary land-use review with Planning & Zoning Commission recommendation and City Council approval, requiring public hearings and 200-foot neighborhood notification under TX LGC §211.007. Texas Local Government Code Chapter 211 grants Frisco (as a home-rule city) broad zoning authority and has not preempted local ADU rules the way California has. Frisco enforces the 2021 International Residential Code with Texas amendments through Building Inspections. Frisco's North Texas tornado exposure places it in ASCE 7 Risk Category II with Wind Zone IV considerations — engineered designs may be required for detached structures above threshold size. Because Frisco spans Collin County (most of city) and a small portion of Denton County, the relevant Central Appraisal District depends on the parcel.