Plano, TX Accessory Structures: ADU Impact Fees (2026)

Plano does not offer ADU-specific impact fee waivers. Standard development fees apply: building permit fees based on construction valuation under the Plano Building Inspections fee schedule, plan-check fees, and trade permit fees (electrical, plumbing, mechanical). Plano collects water and wastewater impact fees under Texas Local Government Code Chapter 395 (Impact Fee Act) and Plano's adopted Land Use Assumptions and Capital Improvements Plan — current rates approximately $1,500-3,500 for water and $2,000-4,500 for wastewater per single-family equivalent connection (subject to periodic update). Roadway impact fees also apply in adopted roadway service areas. Where the accessory unit shares the principal dwelling's existing water/sewer tap and meter, most impact fees can be avoided — Plano's Public Works strongly encourages this approach. Oncor handles electric service; Atmos Energy supplies natural gas; service-extension fees apply separately. Texas has no statewide ADU impact-fee waiver analogous to California Gov. Code §65852.2(f). Affordable housing programs administered through the Plano Housing Department may waive certain fees for income-restricted units, but these are limited and require separate application. Property taxes will adjust through the Collin Central Appraisal District's annual reassessment.