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Unincorporated Jefferson County building permits

Verified

Unincorporated Jefferson County, Idaho — as published 2026-07-07.

Verified 2026-07-08 · Source

Codes adopted

2018 International Building Code (IBC) — adopted by Jefferson County Ordinance 2022-02, effective March 7, 20222018 International Residential Code (IRC) — adopted by Jefferson County Ordinance 2022-02, effective March 7, 2022

Permit types & fees

Residential Building Permit (Single-Family Dwelling / New Construction, Additions, ADUs)

Verified

Required for new single-family dwellings, additions, accessory dwelling units, remodels, and most accessory structures over 120 sq ft in unincorporated Jefferson County. Governed by the 2018 IRC as adopted by Ordinance 2022-02. Applications are submitted through the Jefferson County Planning, Zoning & Building Cityworks public portal; mechanical, electrical, and plumbing trade permits/inspections are handled separately by the Idaho Division of Occupational and Professional Licenses (DOPL), not the county.

Verified 2026-07-08 · Source

Requirements

Building permit required for new single-family dwellings, additions, ADUs, remodels, and accessory structures exceeding 120 sq ft in unincorporated Jefferson County
All construction must comply with the 2018 IRC
Register for and activate an account on the Jefferson County Cityworks public portal (Chrome or Firefox browser required) before applying
Submit Parcel Number, Parcel Size, County Zoning, Location Address/Subdivision info, flood zone status, full dimensional/square-footage data, and setback distances (N/E/W/S) as part of the online application
Site Plan showing all property lines, setbacks, easements, North arrow, existing/proposed structures with dimensions, driveway location, and canals/rivers/roads
Complete set of plans: floor plan(s) with room dimensions, footing/foundation details with steel requirements, truss layout, engineered truss design (stamped by an Idaho-licensed engineer), and all four building elevations
Recorded warranty deed demonstrating ownership or authorization to build
Idaho Contractor's License, or a completed Contractor Exemption form if owner-built
Access Permit from Jefferson County Public Works (county roads) or Idaho Transportation Department (state highways)
Septic Permit (approved) from Eastern Idaho Public Health, or an EIPH authorization-to-connect letter if tying into an existing/private sewer system
If in a mapped flood zone: Flood Plain Development Permit and Elevation Certificate
Mechanical (HVAC), electrical, and plumbing systems must be separately permitted and inspected by Idaho DOPL — not submitted as part of the county building permit package
All required attachments must be individually labeled PDF files uploaded through the portal

Required documents

RequiredSingle Family Dwelling Help Information (Date of Form: January 2, 2024)County checklist of information and documents needed before starting a single-family dwelling application in the Cityworks portal
OptionalAccessory Dwelling Unit (ADU) Building Permit Application – Help Guide (Date of Form: June 26, 2025)County checklist specific to ADUs, including the 1,200 sq ft / 2-bedroom cap and required documents
RequiredSite PlanScaled site plan showing property lines, setbacks, easements, structures, driveway, canals, and North arrow — see county Sample Site Plan resource
RequiredComplete Set of Plans (Floor Plan, Truss Layout, Engineered Truss Design, Elevations)Full architectural/structural plan set uploaded as individually labeled PDF attachments in the Cityworks portal
RequiredRecorded Warranty DeedProof of ownership or authorization to build on the parcel; obtained from the Jefferson County Clerk's Office if not already on hand
RequiredIdaho Contractor's License or Contractor Exemption FormRequired for the contractor of record, or a completed exemption form for owner-builders
RequiredAccess PermitFrom Jefferson County Public Works/Road & Bridge (county roads) or Idaho Transportation Department (state highways)
RequiredSeptic Permit (or EIPH Authorization to Connect)From Eastern Idaho Public Health
OptionalFlood Plain Development Permit and Elevation CertificateRequired only if the parcel is within a mapped flood zone

Fee schedule

Fee type	Amount	Notes
Building permit fee — Total Valuation $1 to $500	$26.46	Jefferson County Fee Schedule 2026, Exhibit A (adopted 4-6-2026)
Building permit fee — Total Valuation $501 to $2,000	$26.46 for the first $500, plus $3.30 for each additional $100 or fraction thereof	Jefferson County Fee Schedule 2026, Exhibit A
Building permit fee — Total Valuation $2,001 to $40,000	$75.96 for the first $2,000, plus $12.13 for each additional $1,000 or fraction thereof	Jefferson County Fee Schedule 2026, Exhibit A
Building permit fee — Total Valuation $40,000 to $100,000	$536.90 for the first $40,000, plus $9.92 for each additional $1,000 or fraction thereof	Jefferson County Fee Schedule 2026, Exhibit A
Building permit fee — Total Valuation $100,001 to $500,000	$1,132.10 for the first $100,000, plus $7.71 for each additional $1,000 or fraction thereof	Jefferson County Fee Schedule 2026, Exhibit A
Building permit fee — Total Valuation $500,001 to $1,000,000	$4,216.10 for the first $500,000, plus $5.52 for each additional $1,000 or fraction thereof	Jefferson County Fee Schedule 2026, Exhibit A
Building permit fee — Total Valuation $1,000,001 to $5,000,000	$6,976.10 for the first $1,000,000, plus $3.30 for each additional $1,000 or fraction thereof	Jefferson County Fee Schedule 2026, Exhibit A
Building permit fee — Total Valuation $5,000,001 and over	$20,176.10 for the first $5,000,000, plus $2.20 for each additional $1,000 or fraction thereof	Jefferson County Fee Schedule 2026, Exhibit A
Manufactured Home — Single Wide	$250.00	Jefferson County Fee Schedule 2026, Exhibit A
Manufactured Home — Double Wide	$500.00	Jefferson County Fee Schedule 2026, Exhibit A
Manufactured Home — Triple Wide	$750.00	Jefferson County Fee Schedule 2026, Exhibit A
Plan Review Fee	15% of Building Permit Fee	Jefferson County Fee Schedule 2026, Exhibit A
GIS/Mapping Review Fee	$30.00 added to each application	Jefferson County Fee Schedule 2026, Exhibit A
Technology Fee	$30.00 added to each application	Jefferson County Fee Schedule 2026, Exhibit A
Inspection Fee	$90.00	Jefferson County Fee Schedule 2026, Exhibit A
Re-Inspection Fee	$90.00	Jefferson County Fee Schedule 2026, Exhibit A
Agricultural Exempt Building Permit	$250.00	Jefferson County Fee Schedule 2026, Exhibit A

Solar Permit

Verified

Unlike some other Idaho counties in this corpus, Jefferson County issues its own distinct county-level 'Solar Permit' (internal Permit Type code BP-SOLAR) for residential rooftop and ground-mounted PV installations in unincorporated Jefferson County, processed through the same Cityworks portal and valuation-based Total Valuation fee formula as the county's general Residential Building Permit. This is directly confirmed by the county's own published April 2026 Monthly Building Statistic Report, which lists three separate BP-SOLAR 'Solar Permit' cases issued that month (case numbers 26-0113, 26-0133, 26-0160), with recorded system valuations of $35,000 and $25,000. As with all other trades in unincorporated Jefferson County, the electrical interconnection portion is separately permitted and inspected by the Idaho Division of Occupational and Professional Licenses (DOPL), not the county.

Verified 2026-07-20 · Source

Requirements

Solar Permit (BP-SOLAR) required for rooftop or ground-mounted PV installations in unincorporated Jefferson County — confirmed as an actively issued, distinct county permit type via the county's own April 2026 Monthly Building Statistic Report
Apply through the Jefferson County Cityworks public portal (same portal used for the Residential Building Permit), following the same general application requirements: site plan, project valuation, and contractor information (Idaho Contractor's License or Contractor Exemption form for owner-installers)
Recorded warranty deed or other proof of ownership/authorization to build, per the county's standard building-permit application package
Electrical interconnection (arrays, inverters, point of connection) requires a separate Idaho DOPL Electrical Permit — not issued by Jefferson County — per the same statewide DOPL mechanism documented for other Idaho counties in this corpus
Access Permit from Jefferson County Public Works (county roads) or Idaho Transportation Department (state highways) if the project requires new/modified access
If in a mapped flood zone: Flood Plain Development Permit and Elevation Certificate

Required documents

RequiredBuilding Permit Application (Cityworks Public Portal, BP-SOLAR permit type)Solar permits are submitted through the same Cityworks portal as other county building permits, selecting the Solar Permit case type
RequiredIdaho Contractor's License or Contractor Exemption FormRequired for the contractor of record, or a completed exemption form for owner-installers — confirmed by real case records showing both licensed-contractor (Big Dog Renewable Energy LLC) and owner/self-contractor solar permits issued in the same month

Fee schedule

Fee type	Amount	Notes
Building permit fee — Total Valuation (same fee-bracket formula as the general Residential Building Permit)	Valuation-based per Jefferson County Fee Schedule 2026, Exhibit A — e.g. $75.96 for the first $2,000 plus $12.13 per additional $1,000 up to $40,000 (a typical range for the $25,000-$35,000 system valuations recorded in the county's own April 2026 permit log)	Jefferson County Fee Schedule 2026, Exhibit A (adopted 4-6-2026). No distinct 'solar' valuation rate is published in the Fee Schedule — BP-SOLAR permits use the same general Total Valuation table as other building permits, confirmed by real recorded valuations ($35,000 and $25,000) in the county's own April 2026 Monthly Building Statistic Report.
Plan Review Fee, GIS/Mapping Fee, Technology Fee, Inspection Fee	15% of Building Permit Fee (Plan Review) + $30 (GIS/Mapping) + $30 (Technology) + $90 (Inspection)	Jefferson County Fee Schedule 2026, Exhibit A — same add-on fees documented for the general Residential Building Permit, applicable to every building-permit-type application including BP-SOLAR.
DOPL Electrical Permit (interconnection, separate from the county Solar Permit)	Statewide Idaho Electrical Board fee schedule — 'Other Installations': wiring cost up to $10,000: $60 + 2%; $10,001-$100,000: $260 + 1% of excess; plus a $65/hr (1-hr minimum) plan review fee for grid-tied systems	Rules of the Idaho Electrical Board, IDAPA 24.39.10 — issued by DOPL, not Jefferson County, per the same statewide mechanism documented for unincorporated Gem County in this corpus.

EV Charger / EVSE Permit

Verified

Jefferson County has no dedicated EV-charger/EVSE building-permit case type (unlike its distinct BP-SOLAR Solar Permit) and does not itself issue electrical permits — installing a Level 2 or DC fast EV charger's dedicated circuit is handled entirely by the Idaho Division of Occupational and Professional Licenses (DOPL), the same as any other electrical work in unincorporated Jefferson County. A county Building Permit applies only if the installation is paired with new structural construction (e.g., a new carport or garage).

Verified 2026-07-20 · Source

Requirements

The electrical circuit/service work for an EV charger requires a State of Idaho DOPL Electrical Permit (dopl.idaho.gov/permits) — Jefferson County does not issue or inspect electrical permits
A county Building Permit (via the Cityworks public portal) is required only if the EV charger installation is paired with new structural construction subject to the 2018 IBC/IRC as adopted by Ordinance 2022-02
Homeowners self-installing on their own residence may use Idaho's Homeowners Electrical permit path through DOPL; contractors must hold a valid Idaho electrical contractor license
Installation must comply with the National Electrical Code edition currently adopted by the State of Idaho Electrical Board

Required documents

RequiredIdaho DOPL Electrical PermitState-issued permit for the EV charger circuit/service work, obtained directly from dopl.idaho.gov/permits, not through Jefferson County
OptionalBuilding Permit Application (Cityworks Public Portal)Only required if the EV charger installation is paired with new structural construction reviewed by the County

Fee schedule

Fee type	Amount	Notes
State Electrical Permit — Existing Dwelling Unit Permit	$65.00 per inspection (flat; no per-branch-circuit surcharge)	Idaho Administrative Code, IDAPA 24.39.10, Section 500.02.a.ii (Rules of the Idaho Electrical Board, official current rule, effective 3-28-23), adminrules.idaho.gov — directly re-chased and confirmed against the authoritative current rule text (https://adminrules.idaho.gov/rules/current/24/243910.pdf). This supersedes an older DOPL webpage figure of "$65 plus $10 per branch circuit"; the $10-per-additional-circuit surcharge language was removed from the official rule effective 3-28-23. Jefferson County itself charges no fee for this work because it does not administer electrical permits; the applicable fee is set entirely by the State of Idaho, not the County.
DOPL Electrical Permit — Other Installations (Including Industrial and Commercial) Permit	Wiring cost up to $10,000: $60 plus 2% of total wiring cost; $10,001-$100,000: $260 plus 1% of excess over $10,000; over $100,000: $1,160 plus 0.5% of excess over $100,000	Idaho Administrative Code, IDAPA 24.39.10, Section 500.02.b, adminrules.idaho.gov (official current rule, effective 3-28-23) — directly re-chased and confirmed against the authoritative current rule text; same statewide fee schedule documented in this file solar-pv-permit entry for the DOPL interconnection portion of solar installations.
County Building Permit (only if paired with new structural construction)	Valuation-based per Jefferson County Fee Schedule 2026, Exhibit A, plus 15% Plan Review, $30 GIS/Mapping, $30 Technology, and $90 Inspection fees	Jefferson County Fee Schedule 2026, Exhibit A (adopted 4-6-2026) — applies only if the EV charger is installed with a new carport/garage/accessory structure requiring county building permit review; the charger circuit itself is never billed by the County.

Sources & verification

Verified against official sources. Last reviewed 2026-07-08.

Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Unincorporated Jefferson County building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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