County Building Permits
Lake County, MT - 2026 Building Permit Guide
How to apply for a building permit in unincorporated Lake County, Montana. Permit authority, application steps, fees, and inspection requirements.
Permit Authority
Unincorporated Lake County areas only. Lake County Unified Development Ordinance applies to unincorporated areas and does NOT apply within incorporated city limits (Polson, Ronan, St. Ignatius).
- Department
- Planning Department
- Address
- 106 4th Avenue East, Polson, MT 59860
- Phone
- 406-883-7235
Online Permit Portal
Platform: Cloudpermit • Account required: Yes • Submission: In-person only
Application Process
- Create Cloudpermit account at us.cloudpermit.com
- Submit application with required documents through online portal
- Planner reviews application and provides feedback via Cloudpermit messaging
- Applicant responds to questions or requests for additional information
- Plan review and approval
- Permit issuance (upon payment of all fees)
- Inspections scheduled as needed during construction
- Final approval upon passing all required inspections
Typical processing time: Average 3 weeks for plan review (state standard); specific Lake County timelines vary by project complexity
Source: Planning Department
General Requirements
Any land development and permanent structures greater than 100 square feet, or lakeshore work within 50 feet of Flathead Lake high water mark
Required Documents
- Completed building permit application
- Site plan showing property boundaries and structure location
- Building plans/drawings to scale
- Proof of ownership or authorization
- Engineering reports (if required)
- ADA compliance documentation (if applicable)
- Lakeshore permits (for work within 50 feet of Flathead Lake)
- Building code
- Lake County follows Montana state building codes. Montana plans to adopt the 2024 ICC family of codes in mid-2026. Current adopted codes include building, electrical, plumbing, and mechanical codes as certified by state.
Fees
- Plan check fee
- Plan review fees payable at time of application submission
- Permit fee formula
- Fees based on project type and scope
- Reinspection fee
- Additional inspection fees may apply
- Payment note
- Fee schedule available through Cloudpermit portal upon application
Fees change. Verify current amounts at the official fee schedule.
Work That Does NOT Require a Permit
Contact the Planning Department to confirm whether your project requires a permit before starting work.
Inspections
How to Schedule
- ()
Typical inspection sequence: 1. Foundation/site inspection (before excavation/grading) 2. Framing inspection (after structural frame is erected) 3. Rough-in inspection (plumbing, electrical, HVAC rough-in) 4. Final inspection (all work complete, before occupancy) 5. Specialized inspections as needed (electrical, plumbing, mechanical, fire code compliance, ADA)
Additional Resources
- Building code: Lake County follows Montana state building codes. Montana plans to adopt the 2024 ICC family of codes in mid-2026. Current adopted codes include building, electrical, plumbing, and mechanical codes as certified by state.
- Zoning information: View zoning info
- Montana Building Codes Program
- Montana Department of Labor & Industry (Building Codes Bureau)
- Lake County Zoning District Primer
- Lake County Forms & Applications
- Standing Maps (zoning districts)
- License lookup guide: Montana Contractor License Requirements
- Contract template: Montana Homeowner-Contractor Agreement
- Montana hub: Montana Contractor License & Permit Hub
Information on this page was last verified: March 2026. Permit rules and fees change — confirm current requirements directly with the Planning Department before applying.
Frequently Asked Questions
Lake County Building Permit FAQ
- Do I need a building permit in unincorporated Lake County, MT?
- Any land development and permanent structures greater than 100 square feet, or lakeshore work within 50 feet of Flathead Lake high water mark
- How much does a building permit cost in unincorporated Lake County, MT?
- Fees are calculated as: Fees based on project type and scope. Plan check fee: Plan review fees payable at time of application submission.
- How do I apply for a building permit in unincorporated Lake County, MT?
- 1. Create Cloudpermit account at us.cloudpermit.com 2. Submit application with required documents through online portal 3. Planner reviews application and provides feedback via Cloudpermit messaging 4. Applicant responds to questions or requests for additional information 5. Plan review and approval 6. Permit issuance (upon payment of all fees) 7. Inspections scheduled as needed during construction 8. Final approval upon passing all required inspections
- How long does it take to get a building permit in unincorporated Lake County, MT?
- Typical processing time is Average 3 weeks for plan review (state standard); specific Lake County timelines vary by project complexity.
- What work is exempt from building permits in unincorporated Lake County, MT?
- The following work is generally exempt: Structures less than 100 square feet if not located within 50 feet of Flathead Lake high water line; Farm and ranch buildings (outside city); Mining buildings on mining property; Residential buildings under 5 dwelling units; Private garages and storage buildings for personal use only; Certain additions and decks (county dependent); Decks less than 30 inches above grade (county-specific); Gazebos and pergolas (county-specific); Residential additions without habitable space (patios, entryways). Note: Electrical and plumbing permits may still be required even for exempt structures.
- How do I schedule a building inspection in unincorporated Lake County, MT?
- Inspections can be scheduled via: .
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