County Building Permits
Washington County, MO - 2026 Building Permit Guide
How to apply for a building permit in unincorporated Washington County, Missouri. Permit authority, application steps, fees, and inspection requirements.
Permit Authority
Public county sources reviewed indicate Washington County does not require permitting for sites outside the city limits of Potosi. This suggests unincorporated areas have no county building permit path publicly posted, but property-specific floodplain, health, septic, driveway, utility, and state licensing requirements may still apply
- Department
- No countywide building permit department publicly found; Washington County government pages reviewed did not show a building permits office
- Address
- 102 N Missouri St, Potosi, MO 63664
- Phone
- 573-438-6111
Online Permit Portal
Platform: None found • Account required: No • Submission: In-person only
Additional resources:
Application Process
- Confirm whether the parcel is inside a city limit, because county permitting is not shown as a public path for unincorporated Washington County
- If another local review applies, coordinate with the relevant city, utility, floodplain, or health authority
- If no municipal issuer applies, no county building permit process was found in public sources
Typical processing time: Not found
General Requirements
No public county building-permit trigger list found for unincorporated areas
Required Documents
- When a permit is required: No public county building-permit trigger list found for unincorporated areas
- Required documents: Not publicly specified
- Permit validity/expiration: Not publicly specified
- Owner-builder rules if available: Not publicly specified
- Contractor license requirements: Not publicly specified in county sources reviewed
- Building code adopted: Not publicly found for countywide unincorporated review
- Permit validity
- Not publicly specified
- Building code
- Not publicly found for countywide unincorporated review
- Owner-builder
- Not publicly specified
- Contractor requirements
- Not publicly specified in county sources reviewed
Fees
- Minimum permit fee
- Not found
- Plan check fee
- Not found
- Permit fee formula
- Not found
- Reinspection fee
- Not found
- Payment note
- Not found
Fees change. Verify current amounts at the official fee schedule.
Work That Does NOT Require a Permit
Contact the No countywide building permit department publicly found; Washington County government pages reviewed did not show a building permits office to confirm whether your project requires a permit before starting work.
Inspections
How to Schedule
- Not publicly specified ()
- Inspection hours
- Not found
Typical inspection sequence: Not publicly specified
Additional Resources
- Building code: Not publicly found for countywide unincorporated review
- Zoning information: View zoning info
- washingtoncountymo.us
- License lookup guide: Missouri Contractor License Requirements
- Contract template: Missouri Homeowner-Contractor Agreement
- Missouri hub: Missouri Contractor License & Permit Hub
Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the No countywide building permit department publicly found; Washington County government pages reviewed did not show a building permits office before applying.
Frequently Asked Questions
Washington County Building Permit FAQ
- Do I need a building permit in unincorporated Washington County, MO?
- No public county building-permit trigger list found for unincorporated areas
- How much does a building permit cost in unincorporated Washington County, MO?
- The minimum permit fee is Not found. Fees are calculated as: Not found. Plan check fee: Not found.
- How do I apply for a building permit in unincorporated Washington County, MO?
- 1. Confirm whether the parcel is inside a city limit, because county permitting is not shown as a public path for unincorporated Washington County 2. If another local review applies, coordinate with the relevant city, utility, floodplain, or health authority 3. If no municipal issuer applies, no county building permit process was found in public sources
- How long does it take to get a building permit in unincorporated Washington County, MO?
- Typical processing time is Not found.
- What work is exempt from building permits in unincorporated Washington County, MO?
- The following work is generally exempt: No public county exempt-work list was found.
- How do I schedule a building inspection in unincorporated Washington County, MO?
- Inspections can be scheduled via: Not publicly specified.
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