Franklin County, MO — 2026 Building Permit Guide

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§ 01

Permit authority

Franklin County Building Department (the county issues and inspects permits for new structures in the unincorporated area and enforces the county codes listed below). 【0†source】citeturn1view0

Street address

400 E Locust, Room 006, Union, MO 63084. 【0†source】citeturn1view0

Phone

(636) 583-6384. 【0†source】citeturn1view0

building@franklinmo.gov. 【0†source】citeturn1view0

Coverage

Covers unincorporated Franklin County; the department issues permits and enforces the 2021 IBC/IRC suite, 2020 NEC, 2021 swimming pool/spa code, and the county's Flood Damage Prevention and Unified Land-Use regulations listed on the same page. 【0†source】citeturn1view0

Online portal

https://www.franklinmo.org/permits (the county's central permit landing page for all construction/ROW categories). 【0†source】citeturn2view0

Franklin County Government Permits web page. 【0†source】citeturn2view0

Website

Department website

last verified April 2026 entry id permits/missouri/franklin/unincorporated

Report a correction

Educational reference. Permit rules and fees change — confirm current requirements directly with Franklin County Building Department (the county issues and inspects permits for new structures in the unincorporated area and enforces the county codes listed below). 【0†source】citeturn1view0 before applying. Jaspector is not legal advice.

Unincorporated Franklin County