Permit Requirements for New Plymouth, Idaho

For Plumbing projects in New Plymouth, determining the correct permitting authority depends on whether the project site is located within the incorporated city limits or in an unincorporated area of Payette County.

Authority Having Jurisdiction (AHJ)

Most jurisdictions require permits for Plumbing work to ensure safety and code compliance. The governing body responsible for issuing these permits varies by specific location:

Within City Limits: The New Plymouth Building Department typically oversees all local building, trade, and safety permits.
Unincorporated Areas: Properties located outside of official city boundaries are generally governed by the Payette County Building & Safety Division.
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General Plumbing Guidelines

Permits are usually required for new installations, structural modifications, or major repairs. While minor maintenance or cosmetic updates may be exempt, landowners should always verify local codes before work begins.

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Because New Plymouth is located within Payette County, the following broader county regulations may also apply to your project:

Idaho, Payette County Plumbing Permit Regulations and County Ordinances for Unincorporated Areas

Payette County Building Permit Requirements

Payette County, Idaho, has specific building permit requirements, particularly for properties in unincorporated areas. The county's Building Safety office, in conjunction with Planning & Zoning, oversees these regulations.

Jurisdiction and Unincorporated Areas

The Payette County Building Department is responsible for issuing building permits for all unincorporated areas within the county. These regulations are enforced through the county's Zoning Ordinance and Subdivision Ordinance, which set development standards for unincorporated areas.

General Permit Requirements

Building permits are required for all new structures, accessory buildings, and any structure that requires a septic permit, even if it does not have a bathroom.
Applications must be submitted in hard copy to the Payette County Planning & Zoning/Building Safety office. Emailed applications are not accepted.
A minimum of two weeks is typically required for application review and approval.
A septic permit is mandatory for all building permits.
Contractors working on projects valued at $2,000 or more (materials and labor combined) must register with the Idaho Department of Labor and Professional Licensing (DOPL).

Required Documents for Application

Completed building permit application.
Septic permit.
Zoning certificate.
Tax assessment notice or property profile.
A site plan, not less than 1/20 scale, including lot lines, easements, drainage, north arrow, lot corners, foundation elevations, septic and well locations, drain field, driveway location and dimensions, and road name.

Building Codes

Payette County adopts the following building codes:

Idaho Residential Code (based on the 2018 International Residential Code with Idaho amendments) for residential projects.
Idaho Building Code (based on the 2018 International Building Code with Idaho amendments) for commercial projects.

Inspections

Required inspections typically include footing, stem wall, basement wall, shear wall, framing, air seal/insulation, and a final inspection. Inspections can be scheduled by calling (208) 642-6018. Inspections called in before 3 p.m. are usually scheduled for the following day.

Resources to Learn More

The following statewide building codes and regulations apply universally to all jurisdictions within Idaho:

Idaho Plumbing Legislation, Codes, and Guidelines

State-Level Plumbing Codes and Legislation in Idaho

Plumbing regulations in Idaho are established to protect public health, safety, and welfare by setting minimum standards for the design, installation, and maintenance of plumbing systems. The legal framework for these regulations is primarily found in Idaho Code Title 54, Chapter 26, which governs the licensing of plumbing professionals and the administration of the state's plumbing program.

The state of Idaho adopts the Uniform Plumbing Code (UPC), published by the International Association of Plumbing and Mechanical Officials (IAPMO), as its base technical standard. This is integrated into the Idaho State Plumbing Code (ISPC), which includes the base UPC along with specific state-level amendments adopted by the Idaho Plumbing Board to address local conditions and requirements. These rules are further detailed in the Idaho Administrative Code (IDAPA), specifically under the rules governing plumbing.

Regulatory Agencies and Oversight

The primary state agency responsible for the administration and enforcement of plumbing standards in Idaho is the Division of Occupational and Professional Licenses (DOPL). DOPL oversees the licensing of plumbing contractors, journeyman plumbers, and apprentice plumbers, as well as the issuance of permits and the conduct of inspections.

Within this structure, the Idaho Plumbing Board plays a critical role. The Board is responsible for adopting and updating the Idaho State Plumbing Code, reviewing licensing applications, and addressing industry concerns. The Board works in conjunction with DOPL to ensure that plumbing installations across the state comply with established safety and technical standards.

Resources to Learn More

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