Digital permit application gateway
Start with the issuing authority’s own submission lane. A complete application package, accurate valuation, and accessible inspection path are the fastest route through statutory plan review.
Recommended first click
Use the official digital gateway to submit plans, monitor review comments, pay required charges, and request inspections when the permit is issued. If the link is unavailable, use the agency website or phone number on the administrative profile to confirm the current lane.
Typical review lane
N/A for ordinary building permits; the county publishes no fixed review timeline. Conditional-use applications must generally be submitted at least 30 days before the next Planning & Zoning Commission meeting, and staffing/workload may affect response times.
Treat this as a planning signal, not a guaranteed approval date. Completeness, corrections, resubmittals, and agency workload control the actual clock.
Verify the parcel is inside this agency’s service area and note whether a city, state, fire marshal, septic authority, or utility district also has approval authority.
Prepare legible plans, site information, project valuation, ownership authorization, contractor information, and any energy, floodplain, zoning, or utility documentation the issuing office requires.
Keep the permit number, approved plan set, correction comments, fee receipts, and inspection results together. Those records establish the compliance trail for the next trade.
Application documents
Before submission, call 636-583-6384 (Building Department); 636-583-6369 (Planning & Zoning) if the project involves a change of occupancy, structural alteration, accessory structure, demolition, or work near a regulated environmental feature.
Source trail
Use these direct agency or licensing links to confirm current instructions before you file, pay, or schedule work. External pages control if their information differs from this directory.
Project questions
Franklin County Building Department and Planning & Zoning Department is the identified county-level authority for this profile. Confirm that the property is in its service area before filing.
Begin with the online permit gateway listed in the application guide. If the portal does not recognize the address or project type, contact 636-583-6384 (Building Department); 636-583-6369 (Planning & Zoning).
N/A for ordinary building permits; the county publishes no fixed review timeline. Conditional-use applications must generally be submitted at least 30 days before the next Planning & Zoning Commission meeting, and staffing/workload may affect response times.
The Building Department issues permits and inspects new construction in unincorporated Franklin County. The county publishes inspection guidelines by request; contact 636-583-6384 or building@franklinmo.gov to schedule inspections and obtain the current guidelines. Floodplain applications may require longer review and SEMA forms.
For unincorporated Franklin County, the county lists the 2021 International Building, Residential, Mechanical, Plumbing, Fire, ICC Electrical, and Swimming Pool & Spa Codes, plus the 2020 National Electrical Code. The county's on-site sewage ordinance was amended September 23, 2025 and became effective October 1, 2025; the Flood Damage Prevention Ordinance and Unified Land-Use Regulations also apply. Franklin County requires permits for construction and right-of-way use, and the county notes that municipalities and Missouri may require additional permits. The current building page publishes no broad cosmetic/minor-work exemption list; contact the Building Department to determine whether a specific repair or alteration requires a permit.
What makes an application complete
Before you click submit, make sure the drawings agree with the site plan, project description, valuation, ownership authorization, and contractor information. If the work changes structure, occupancy, drainage, fire protection, energy performance, or utility demand, describe that scope plainly. Ambiguous narratives create correction cycles and delay the field schedule.
Save the confirmation number, payment receipt, uploaded plan set, and every correction comment. Those records are the backbone of a defensible compliance file when multiple trades or agencies share responsibility.
Submission quality check
Site: address, parcel, access, setbacks, and existing conditions are consistent.
Scope: structural, mechanical, plumbing, electrical, fire, and energy work is identified.
Closeout: inspection contacts and the final approval path are understood before work begins.