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ADU Construction · Franklin County, Kansas
Permit required
In Kansas, a ADU Construction requires a building permit.
An accessory dwelling unit (ADU) always requires a building permit because it adds a habitable dwelling, including electrical, plumbing, mechanical permits and egress/zoning review. Plans are reviewed under the Local code (IRC 2018); apply through Franklin County Planning & Building before work begins.
Source: Local, IRC 2018 · Verified 2026 by StateDataIndex
Building an Accessory Dwelling Unit requires complex zoning, structural, and utility permits.
With a growing population of around 26,106 residents, Franklin 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 Kansas Building Code.
Local Zoning & Setbacks in Franklin County
Regardless of the state permit rule above, Franklin County still enforces property-line setbacks and local zoning for your ADU Construction. A permanent foundation or any electrical/plumbing hookup can also change what is required, so confirm with Franklin County Planning & Building before building.
Zoning & Cost Factors
Kansas counties hold the primary authority for zoning and subdivision regulations, often focusing on flood plain management in eastern regions. Fortunately, Kansas maintains relatively builder-friendly regulations, keeping base permit fees competitive.
Estimated municipal base fee: $383–$585
This is a planning estimate only — actual fees in Franklin County depend on your project valuation. A typical breakdown looks roughly like:
- Application Fee: ~$135
- Plan Review Fee: ~$90
- Inspection Fee: ~$225
Always confirm exact fees with your local building department before applying.
Cost Comparison: Franklin County vs State Average
State Average Base Fee
Franklin County Estimated Base Fee
*Chart represents median application base fees and does not include project valuation percentages.
Franklin County Building Department
Office: Franklin County Planning & Building
Address: 1428 S Main St #5, Ottawa, KS 66067, USA
Phone: (785) 229-3570
Source: official Franklin County government records. Hours and procedures can change — call ahead to confirm.
How to Apply in Franklin County
In Franklin 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.
ADU Construction Requirements in Franklin County
Typical Submittal Package
When applying for a ADU Construction permit, you or your contractor will generally need to submit the following documentation for the city's review:
- Comprehensive architectural and structural plans
- Foundation engineering reports
- Sewer, water, and utility connection plans
- Site plan showing property lines and setbacks
Standard Ordinances & Processing Time
Key code points for a ADU Construction in Franklin County: ADUs typically have maximum square footage limits (often 800-1200 sq ft), height restrictions, and usually require dedicated off-street parking depending on local zoning.
Estimated processing time in Franklin County: 1 to 5 business days (Often over-the-counter).
Frequently Asked Questions
What happens if I build a ADU Construction without a permit in Franklin 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 ADU Construction permit in Kansas?
Yes. Kansas 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 Kansas Building Code.
How much does a ADU Construction permit cost in Franklin County?
As a planning estimate, base municipal fees for a ADU Construction permit in Franklin County typically fall between $383 and $585. 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 ADU Construction permit in Franklin County?
Based on the size of Franklin 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 ADU Construction permit in Franklin County?
You can apply through the Franklin County Planning & Building or online via the county permit portal. For questions, call (785) 229-3570.
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Read GuideBuilding It Yourself? Here's What You'll Need
Planning an ADU? Tools homeowners use in the design and layout phase:
📘
Backyard ADU Design Guide (Book)
View on Amazon →
📐
Laser Level
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🔍
Franklin ProSensor Stud Finder
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📏
25ft Tape Measure
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Other Permit Types in Franklin County
Planning another home improvement project? Check the requirements and fees for:
Nearby Jurisdictions in Kansas
Building near the county line? Check requirements for neighboring areas: