Lake County, MT — 2026 Building Permit Guide

On this page 6

§ 01

Permit authority

Planning Department

Street address

106 4th Avenue East, Polson, MT 59860

Phone

406-883-7235

Coverage

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).

Online portal

Cloudpermit

Website

Department website

§ 02

When a permit is required

Permit triggers and exempt work for Lake County

Any land development and permanent structures greater than 100 square feet, or lakeshore work within 50 feet of Flathead Lake high water mark

Scope of work

Permit?

Structures less than 100 square feet if not located within 50 feet of Flathead Lake high water line

Exempt

Farm and ranch buildings (outside city)

Exempt

Mining buildings on mining property

Exempt

Residential buildings under 5 dwelling units

Exempt

Private garages and storage buildings for personal use only

Exempt

Certain additions and decks (county dependent)

Exempt

Decks less than 30 inches above grade (county-specific)

Exempt

Gazebos and pergolas (county-specific)

Exempt

Residential additions without habitable space (patios, entryways)

Exempt

Exempt Structures less than 100 square feet if not located within 50 feet of Flathead Lake high water line
Exempt Farm and ranch buildings (outside city)
Exempt Mining buildings on mining property
Exempt Residential buildings under 5 dwelling units
Exempt Private garages and storage buildings for personal use only
Exempt Certain additions and decks (county dependent)
Exempt Decks less than 30 inches above grade (county-specific)
Exempt Gazebos and pergolas (county-specific)
Exempt Residential additions without habitable space (patios, entryways)

Note: Electrical and plumbing permits may still be required even for exempt structures.

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.

Source: Planning Department ↗

§ 03

Application process

Typical processing: Average 3 weeks for plan review (state standard); specific Lake County timelines vary by project complexity

01

Create Cloudpermit account at us.cloudpermit.com
02

Submit application with required documents through online portal
03

Planner reviews application and provides feedback via Cloudpermit messaging
04

Applicant responds to questions or requests for additional information
05

Plan review and approval
06

Permit issuance (upon payment of all fees)
07

Inspections scheduled as needed during construction
08

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 ↗

§ 04

Fee schedule

Lake County building permit fees

Fee type

Amount

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

Fee schedule available through Cloudpermit portal upon application

Fees change periodically. Confirm at the official fee schedule ↗ before budgeting.

§ 05

Required inspections

Scheduling and sequence

How to schedule

Applicant or contractor schedules required inspections through permit office or Cloudpermit system (phone)

Typical 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)

Source: Planning Department ↗

§ 06

Frequently asked

Common questions about unincorporated Lake County permits

01 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

02 How much does a building permit cost in unincorporated Lake County, MT? ▸

Building permit fees in unincorporated Lake County, MT are set by the local building department and vary by project type and valuation. Fees are calculated as: Fees based on project type and scope. Plan check fee: Plan review fees payable at time of application submission.

03 How do I apply for a building permit in unincorporated Lake County, MT? ▸

To apply for a building permit in unincorporated Lake County, MT, follow these steps: 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

04 How long does it take to get a building permit in unincorporated Lake County, MT? ▸

Building permit processing times in unincorporated Lake County, MT typically run Average 3 weeks for plan review (state standard); specific Lake County timelines vary by project complexity. Timelines can vary based on project complexity and current department workload.

05 What work is exempt from building permits in unincorporated Lake County, MT? ▸

Not all construction work requires a permit 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. When in doubt, confirm with the local building department before starting work.

06 How do I schedule a building inspection in unincorporated Lake County, MT? ▸

Once your permit is issued and work reaches an inspection milestone, you can schedule a building inspection in unincorporated Lake County, MT via: Applicant or contractor schedules required inspections through permit office or Cloudpermit system.

last verified March 2026 source Planning Department ↗ entry id permits/montana/lake/unincorporated

Report a correction

Educational reference. Permit rules and fees change — confirm current requirements directly with Planning Department before applying. Jaspector is not legal advice.