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Solar Photovoltaic (PV) Permit in Unincorporated Franklin County, Idaho

Required for installation of rooftop or ground-mount solar photovoltaic systems in unincorporated Franklin County. No solar-specific fee line item is published; the structural/mounting portion is billed under the same 1% of assessed value Building Permit Fee used for general construction, per Franklin County Code § 150.018. The County's own Building Permit Application packet requires an Electrical Plan as part of the submittal for new construction, but no distinct county-issued electrical permit type is published — consistent with the pattern seen across most other Idaho counties in this database, where electrical interconnection work is routed to the State of Idaho DOPL/Division of Building Safety rather than the county (not independently confirmed for Franklin County specifically in this session).

Verified 2026-07-20 · Source

When you need this permit

  • Building Permit Fee is 1% of the assessed value of the proposed building, payable when the application is made, per Franklin County Code § 150.018
  • Electrical Plan required as part of the submittal packet, drawn to scale showing all lighting, switches, outlets, meter locations, and inter-connected smoke/carbon monoxide detectors, per the County's own Building Permit Information and Process document
  • County Recorder has up to 31 days after receipt of an application to investigate the proposed work (§ 150.017(D)), and a further period to approve, disapprove, or conditionally approve (§ 150.017(E)) — the ordinance text does not make clear whether these periods are concurrent or cumulative
  • GENUINE GAP: whether the electrical interconnection permit itself is issued by Franklin County or by the State of Idaho DOPL/Division of Building Safety was not conclusively confirmed on the County's own published pages in this session — confirm directly with the Building Department (208-221-6149) before relying on either path

Required documents

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Fee schedule

Building Permit FeeFranklin County Code § 150.018 (Ord. 2016-2-22, passed 2-22-2016) — no distinct solar line item published; same fee mechanism used for all construction
1% of the assessed value of the proposed building

Review timeline

Plan reviewUnincorporated Franklin County’s published plan-review target
Up to 31 business days

How long did your Solar Photovoltaic (PV) Permit permit actually take in Unincorporated Franklin County?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Final Inspection (mounting/roof penetrations)

    Racking and roof-penetration compliance verified by Franklin County

See the full Unincorporated Franklin County inspection guide — scheduling & re-inspection fees →

Tips

  • Franklin County's Building Permit fee is a flat 1% of assessed value — unlike the tiered valuation tables used by many neighboring Idaho counties, there is no separate rate schedule to look up.
  • Confirm directly with the Building Department (208-221-6149 / plans@fcidaho.us) which agency issues the electrical interconnection permit before scheduling a solar installation — this database could not conclusively confirm County vs. State DOPL jurisdiction for Franklin County specifically.

Frequently asked questions

Unincorporated Franklin County requires a solar photovoltaic (pv) permit for: Building Permit Fee is 1% of the assessed value of the proposed building, payable when the application is made, per Franklin County Code § 150.018; Electrical Plan required as part of the submittal packet, drawn to scale showing all lighting, switches, outlets, meter locations, and inter-connected smoke/carbon monoxide detectors, per the County's own Building Permit Information and Process document; County Recorder has up to 31 days after receipt of an application to investigate the proposed work (§ 150.017(D)), and a further period to approve, disapprove, or conditionally approve (§ 150.017(E)) — the ordinance text does not make clear whether these periods are concurrent or cumulative; GENUINE GAP: whether the electrical interconnection permit itself is issued by Franklin County or by the State of Idaho DOPL/Division of Building Safety was not conclusively confirmed on the County's own published pages in this session — confirm directly with the Building Department (208-221-6149) before relying on either path. If your project isn't listed, confirm with Franklin County Building Department at (208) 221-6149 before starting work.

The same as any other building permit: 1% of the assessed value of the proposed construction, per Franklin County Code § 150.018. No distinct solar fee line item is published.

Unincorporated Franklin County's published plan-review target for a solar photovoltaic (pv) permit is Up to 31 business days.

You'll need: Franklin County Building Permit Application. See the required-documents checklist on this page for details on each.

Unincorporated Franklin County requires 1 inspection(s) for a solar photovoltaic (pv) permit, in order: Final Inspection (mounting/roof penetrations). Schedule each through Franklin County Building Department ((208) 221-6149).

Apply through Franklin County Building Department at 561 West Oneida, Preston, ID 83263. Phone: (208) 221-6149, email: plans@fcidaho.us. Office hours: Monday–Friday, 9:00 AM to 5:00 PM, per franklincountyidaho.org/departments/building_department.php. Building Inspector: Randy Henrie, who also serves as the county's Planning and Zoning Administrator, per the county's own Building Permit Information and Process document (fax: 208-852-1096)..

Unincorporated Franklin County, Idaho has adopted: International Building Code (IBC), including all rules promulgated by the Idaho Building Code Board to provide equivalency with ADA and Federal Fair Housing Act accessibility guidelines — Franklin County Code of Ordinances § 150.001(A)(1). The county code adopts codes by reference to 'the approved editions... as adopted by the state or the state's Building Code Board' rather than citing a specific numbered edition itself; per § 150.001(B), adopted codes 'shall be deemed superseded by successive versions... as they are adopted or approved by the state's Building Code Board, effective on the date any such codes are made effective by the state's Building Code Board' — meaning Franklin County's in-force edition tracks the Idaho Division of Building Safety's statewide adoption automatically.; International Residential Code (IRC), Parts I-VI — Franklin County Code § 150.001(A)(2), same state-tracking mechanism per § 150.001(B).; International Energy Conservation Code (IECC) — Franklin County Code § 150.001(A)(3).; International Mechanical Code (IMC) — Franklin County Code § 150.001(A)(4).; International Fuel Gas Code (IFGC) — Franklin County Code § 150.001(A)(5).; International Fire Code (IFC) — Franklin County Code § 150.001(A)(6).; NOTE: Franklin County's ordinance text (Ord. 2010-6-28; originally Ord. 2003-1) does not itself state specific edition years (e.g. '2021 IBC') — it adopts by reference whatever edition the Idaho Building Code Board has currently approved statewide. This file therefore does not fabricate a specific year for each code; the Idaho Division of Building Safety's current statewide adoption (per dopl.idaho.gov/bld) governs and should be checked directly for the in-force edition as of any given date.. Local amendments apply — see the Unincorporated Franklin County overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-20.

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 Franklin County building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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