Topeka, KS Accessory Structures: ADU Impact Fees (2026)

Topeka's fee structure is set by City Council resolution and the Code's permit-fee schedule administered by Planning and Development Services. Standard building permit fees scale with construction value — typical small detached ADU permits run in the $300-$900 range, with separate electrical, plumbing, and mechanical trade permits priced individually. Plan review fees commonly add a percentage of the base building permit fee. Topeka Water charges water and wastewater connection fees only when a new meter or new sanitary tap is installed; sharing the existing service with the principal dwelling avoids new connection charges. Kansas has not adopted a statewide development impact fee enabling statute analogous to California's Mitigation Fee Act or Idaho's Development Impact Fee Act, so Topeka does not levy parks, transportation, or school impact fees on ADU construction. Shawnee County Appraiser (1515 NW Saline St) will reassess the property after construction, raising the annual property tax based on the increased improvements value. Stormwater fees billed through Topeka's stormwater utility may increase if impervious surface significantly grows. The County's road impact through traffic mitigation is handled at the planning stage for large subdivisions, not on individual residential ADUs.