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Installing a new fence can improve privacy and property value. However, most counties require a permit if the fence exceeds 6 feet in height or is located in the front yard.
Set by local rules
Do you need a permit for Fence Installation in Mercer County?
In Missouri, there is no single statewide rule for a Fence Installation; whether you need a permit is decided locally in Mercer County.
Fences are governed mainly by local zoning, not a statewide building permit. Cities set height limits (commonly 3-4 ft in front yards and 6 ft in back and side yards), setbacks, and corner sight-line rules, and many require a zoning permit for any fence. Most jurisdictions exempt fences up to 7 ft from a building permit (IRC R105.2) and require one above that. Replacing a fence at the same height, material, and location usually needs no permit; a fence used as a pool barrier always does. Because Missouri leaves this to local jurisdictions, the reliable answer comes from Building Permits & Inspections. Zoning setbacks apply either way.
Source: Local, IRC 2018 · Verified 2026 by StateDataIndex
With a growing population of around 3,482 residents, Mercer County maintains a relatively streamlined permitting process compared to major urban hubs. Processing typically takes 1 to 3 weeks.
Code Compliance & Inspections
In high-wind, tornado-prone areas, inspectors strictly verify structural anchoring and framing compliance under the Missouri Building Code.
Local Zoning & Setbacks in Mercer County
Regardless of the state permit rule above, Mercer County still enforces property-line setbacks and local zoning for your Fence Installation. A permanent foundation or any electrical/plumbing hookup can also change what is required, so confirm with Building Permits & Inspections before building.
Zoning & Cost Factors
Missouri exhibits a sharp divide between highly regulated urban zoning in St. Louis and Kansas City, and virtually unzoned rural counties in the Ozarks. Fortunately, Missouri maintains relatively builder-friendly regulations, keeping base permit fees competitive.
Estimated municipal base fee: $43–$65
This is a planning estimate only — actual fees in Mercer County depend on your project valuation. A typical breakdown looks roughly like:
- Application Fee: ~$15
- Plan Review Fee: ~$10
- Inspection Fee: ~$25
Always confirm exact fees with your local building department before applying.
Cost Comparison: Mercer County vs State Average
State Average Base Fee
Mercer County Estimated Base Fee
*Chart represents median application base fees and does not include project valuation percentages.
Mercer County Building Department
Office: Building Permits & Inspections
Address: 400 E Locust St, Union, MO 63084, USA
Phone: (636) 583-6384
Source: official Mercer County government records. Hours and procedures can change — call ahead to confirm.
How to Apply in Mercer County
In Mercer County, you or your contractor typically submit blueprints and a property survey to the local building department. Call ahead to confirm hours and accepted payment methods.
Fence Installation Requirements in Mercer County
Typical Submittal Package
When applying for a Fence Installation permit, you or your contractor will generally need to submit the following documentation for the city's review:
- Site Plan showing property lines and setbacks
- Fence elevation and material specifications
- HOA approval letter (if applicable)
Standard Ordinances & Processing Time
Key code points for a Fence Installation in Mercer County: Standard US zoning caps residential backyard fences at 6 feet high and front yard fences at 4 feet for visibility, intersection safety, and utility access.
Estimated processing time in Mercer County: 1 to 5 business days (Often over-the-counter).
Frequently Asked Questions
What happens if I build a Fence Installation without a permit in Mercer County?
Building without authorization is considered a code violation. The local government can issue a Stop Work Order, forcing you to halt construction immediately. You may be subject to retroactive permit fees (often double the original cost), daily fines, or even a mandate to tear down the unpermitted work at your own expense.
Can a homeowner pull their own Fence Installation permit in Missouri?
Yes. Missouri generally allows property owners to act as their own general contractor under an Owner-Builder exemption. If you take this route, you assume full legal and financial liability and must ensure all work complies with the Missouri Building Code.
How much does a Fence Installation permit cost in Mercer County?
As a planning estimate, base municipal fees for a Fence Installation permit in Mercer County typically fall between $43 and $65. The final amount depends on your project valuation, so confirm the exact figure with the local building department.
How long does it take to get a Fence Installation permit in Mercer County?
Based on the size of Mercer County, the typical processing time is 1 to 5 business days (Often over-the-counter). Times vary with the season and the building department application volume.
Where do I apply for a Fence Installation permit in Mercer County?
You can apply through the Building Permits & Inspections or online via the county permit portal. For questions, call (636) 583-6384.
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Other Permit Types in Mercer County
Planning another home improvement project? Check the requirements and fees for:
Nearby Jurisdictions in Missouri
Building near the county line? Check requirements for neighboring areas: