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Commercial Building Permit (New Construction, Additions & Remodels / Tenant Improvement) in Unincorporated Cassia County, Idaho

Required for new commercial construction and for commercial additions, remodels, and tenant-improvement build-outs in unincorporated Cassia County, reviewed under the 2018 IBC as adopted by County Code Title 11, Chapter 1 (effective January 1, 2021). Cassia County has no separate commercial building permit, tenant-improvement, or remodel permit product — commercial projects use the same Cassia County Building Permit Application used for residential work, checking 'Commercial' under Item 11 (Use) and 'Addition' for remodel/TI scope. The building permit fee itself is calculated the same way for both tracks (square footage against the IBC 2003 Valuation Table 1), but commercial applicants pay a non-refundable $500.00 Plan Review fee instead of the $200.00 residential fee. Electrical, plumbing, and HVAC/mechanical work is permitted separately through the Idaho Division of Occupational and Professional Licenses (DOPL), not the county.

Verified 2026-08-25 · Source

When you need this permit

  • Building permit required for new commercial construction and for commercial additions, remodels, and tenant-improvement build-outs covered under the 2018 IBC as adopted by Cassia County (Title 11, Chapter 1, Section 11-1-1, effective January 1, 2021; County Code 11-1-4)
  • Applicant checks 'Commercial' under Item 11 (Use) on the Cassia County Building Permit Application, and 'Site Built' or 'Addition' for project type — 'Addition' covers remodel/tenant-improvement scope, since no separate TI checkbox or form exists
  • A non-refundable $500.00 Plan Review fee is required with application submittal for commercial projects, applied toward the total building permit fee — Cassia County Administrative Fees, Building Department section
  • Building permit fee is calculated based on square footage using the IBC 2003 Valuation Table 1, the same fee basis published for residential projects; the county's Administrative Fees page does not publish the underlying dollar-tier breakdown of that table
  • Parcel number required, with Assessor's Office review; the application's Recorded Deed Number field (Item 5) is labeled 'for new residential construction only' and is not stated as a commercial requirement
  • Septic Permit Number from South Central Public Health District required where applicable (submit copy)
  • Applicable Highway District, Irrigation District/Canal Company, and Fire District notification and signature required on the application (Items 7-9) — the same notification line is used for both residential and commercial applicants; no separate commercial-specific fire district review process or fee is published
  • Site plan/plot map showing distances from road centerline (min. 54 ft) and interior property lines (15 ft generally, 5 ft in the Industrial Commercial (IC) zone per County Code 9-8-2), with at least one building corner tied to a property line or corner
  • Two sets of plans required: Site Plan, Foundation/Basement Plan, Floor Plan, Elevation Plan, Siding/Roof Pitch, Wall Cross Section, Window & Door Schedule/Rescheck (Energy Code Compliance Analysis)
  • Contractor Registration Number (Idaho) and expiration date required if using a contractor Contractor

Required documents

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Fee schedule

Building permit fee
Cassia County Administrative Fees schedule, Building Department section (cassia.gov/administrative-fees): 'Building Permit = calculated based on square footage, and IBC 2003 Valuation Table 1.' Same… Show full citationCassia County Administrative Fees schedule, Building Department section (cassia.gov/administrative-fees): 'Building Permit = calculated based on square footage, and IBC 2003 Valuation Table 1.' Same fee basis used for the residential building permit; the county does not publish the underlying dollar-tier breakdown of that table.
Calculated based on square footage using the IBC 2003 Valuation Table 1
Plan Review — Commercial
Non-refundable, applied to total building permit fee. Show full citationNon-refundable, applied to total building permit fee. Cassia County Administrative Fees schedule, Building Department section: 'Plan Review-Commercial $500.00' (versus 'Plan Review-Residential $200.00' on the same line item). Commercial building permits — including new commercial construction and commercial tenant-improvement/remodel work — use the same Building Permit Application (Item 11: Use — check 'Commercial') and the same square-footage/IBC 2003 Valuation Table 1 building-permit-fee basis as residential; Cassia County has no separate commercial-specific permit product, application, or fee schedule.
$500.00
Re-inspection / not-ready-for-inspection feeCharged if the project is not ready for inspection at the scheduled appointment time; Cassia County Building Permit Application (2025) — applies to all permit types, including commercial
$30.00 per hour (1 hour minimum)

Review timeline

Plan review
Not published — contact the department

How long did your Commercial Building Permit (New Construction, Additions & Remodels / Tenant Improvement) permit actually take in Unincorporated Cassia County?

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

Inspection process

  1. 1

    Site/Setbacks

    Per IRC R109.1 — verifies compliance with 54 ft road-center setback and interior lot-line setbacks (15 ft generally, 5 ft in the Industrial Commercial (IC) zone)

  2. 2

    Footings

    Per IRC 109.3, 109.4, 109.1.5

  3. 3

    Foundation

    Per IRC R109.1.1

  4. 4

    Shear Wall

    Verifies shear wall construction per approved plans

  5. 5

    Rough Framing

    Conducted after State Electrical Rough, Plumbing Rough, and HVAC Rough inspections (IRC R109.4) — coordinate with Idaho DOPL trade inspections first

  6. 6

    Energy

    Energy code compliance per adopted 2018 IECC / Rescheck analysis

  7. 7

    Wall Board

    Verifies wall board/drywall installation prior to closing walls

  8. 8

    Final

    All work complete; required before occupancy

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

Tips

  • Cassia County has no separate commercial building permit or tenant-improvement (TI)/remodel permit — commercial new construction, additions, and remodels use the same Building Permit Application (check 'Commercial' for Item 11: Use, and 'Addition' for TI/remodel work), the same Title 11 Chapter 1 building code, and the same square-footage/IBC 2003 Valuation Table 1 fee basis as residential.
  • The only published fee difference between the two tracks is the Plan Review fee: $500.00 for commercial versus $200.00 for residential. The underlying building permit fee is calculated the same way for both, using the IBC 2003 Valuation Table 1.
  • The Industrial Commercial (IC) zone carries a reduced 5-foot interior/rear setback instead of the standard 15 feet used elsewhere in the unincorporated county (County Code 9-8-2).
  • The application's required-inspection list (Item 14) cites International Residential Code section numbers even though the same application and inspection sequence govern commercial projects; no separate IBC-numbered inspection checklist for commercial work is published.
  • Electrical, plumbing, and HVAC/mechanical permits are issued by the Idaho Division of Occupational and Professional Licenses (DOPL), not Cassia County, for commercial projects as well as residential — apply at dopl.idaho.gov or call 1-800-955-3044.
  • Idaho Code 39-4117 gives local governments 20 business days to determine whether a commercial building permit application is complete, versus 10 business days for residential. This is a statewide statute, and it covers only the completeness determination, not the full plan review.
  • The application requires a notification signature line for the Applicable Fire District (Item 9), the same as for residential applicants; no separate commercial fire-district review process or fee amount is published by the county.

Frequently asked questions

Unincorporated Cassia County requires a commercial building permit (new construction, additions & remodels / tenant improvement) for: Building permit required for new commercial construction and for commercial additions, remodels, and tenant-improvement build-outs covered under the 2018 IBC as adopted by Cassia County (Title 11, Chapter 1, Section 11-1-1, effective January 1, 2021; County Code 11-1-4); Applicant checks 'Commercial' under Item 11 (Use) on the Cassia County Building Permit Application, and 'Site Built' or 'Addition' for project type — 'Addition' covers remodel/tenant-improvement scope, since no separate TI checkbox or form exists; A non-refundable $500.00 Plan Review fee is required with application submittal for commercial projects, applied toward the total building permit fee — Cassia County Administrative Fees, Building Department section; Building permit fee is calculated based on square footage using the IBC 2003 Valuation Table 1, the same fee basis published for residential projects; the county's Administrative Fees page does not publish the underlying dollar-tier breakdown of that table; Parcel number required, with Assessor's Office review; the application's Recorded Deed Number field (Item 5) is labeled 'for new residential construction only' and is not stated as a commercial requirement; Septic Permit Number from South Central Public Health District required where applicable (submit copy); Applicable Highway District, Irrigation District/Canal Company, and Fire District notification and signature required on the application (Items 7-9) — the same notification line is used for both residential and commercial applicants; no separate commercial-specific fire district review process or fee is published; Site plan/plot map showing distances from road centerline (min. 54 ft) and interior property lines (15 ft generally, 5 ft in the Industrial Commercial (IC) zone per County Code 9-8-2), with at least one building corner tied to a property line or corner; Two sets of plans required: Site Plan, Foundation/Basement Plan, Floor Plan, Elevation Plan, Siding/Roof Pitch, Wall Cross Section, Window & Door Schedule/Rescheck (Energy Code Compliance Analysis); Contractor Registration Number (Idaho) and expiration date required if using a contractor. If your project isn't listed, confirm with Cassia County Zoning and Building Department at 208-878-7302 before starting work.

No separate fee is published. The Building Permit Application requires an applicant to designate the Applicable Fire District and obtain its authorized signature acknowledging notification of the project (Item 9) — the same requirement that applies to residential applicants. No distinct commercial fire-district review fee or process was found on the county's Administrative Fees page or the application itself.

The county does not publish a full commercial plan-review timeline. Idaho Code 39-4117 separately requires the county to determine within 20 business days whether a commercial building permit application is complete (versus 10 business days for residential) and to notify the applicant of that determination — a completeness check, not a guarantee of full plan-review completion within that window.

You'll need: Cassia County Building Permit Application (2025); Plot Map / Site Plan; Two Sets of Construction Plans (Site, Foundation, Floor, Elevation, Siding/Roof Pitch, Wall Cross Section, Window & Door Schedule/Rescheck). Depending on your project, Unincorporated Cassia County may also ask for: Septic Permit (copy). See the required-documents checklist on this page for details on each.

Unincorporated Cassia County requires 8 inspection(s) for a commercial building permit (new construction, additions & remodels / tenant improvement), in order: Site/Setbacks, Footings, Foundation, Shear Wall, Rough Framing, Energy, Wall Board, Final. Schedule each through Cassia County Zoning and Building Department (208-878-7302).

Apply through Cassia County Zoning and Building Department at Cassia County Courthouse, 1459 Overland Ave., Room 210, Burley, ID 83318. Phone: 208-878-7302, email: bldgdept@cassia.gov. Office hours: Mon–Fri 8:30 AM – 5:00 PM. Official information: https://www.cassia.gov/permit-information.

Unincorporated Cassia County, Idaho has adopted: 2018 International Building Code (IBC), including appendices E, G, H, and I — adopted via Cassia County Code Title 11, Chapter 1 (11-1-1), effective January 1, 2021; 2018 International Residential Code (IRC), including parts I–IV and IX, and appendices H, J, Q, and S — adopted via Title 11, Chapter 1; 2018 International Existing Building Code (IEBC) — adopted via Title 11, Chapter 1; 2018 International Energy Conservation Code (IECC) — adopted via Title 11, Chapter 1; 2018 International Fire Code (IFC) — adopted via Title 11, Chapter 1; Idaho Manufactured Home Installation Current Standard — adopted via Title 11, Chapter 1; 1997 Uniform Code for Abatement of Dangerous Buildings — adopted via Title 11, Chapter 1. Local amendments apply — see the Unincorporated Cassia County overview page for the full list.

No. Unincorporated Cassia County does not issue a distinct commercial building permit or tenant-improvement/remodel permit. Commercial new construction, additions, and remodels use the same Building Permit Application used for residential projects — applicants check 'Commercial' under Item 11 (Use) and, for remodel/TI work, 'Addition' — and are reviewed under the same Title 11, Chapter 1 building code (2018 IBC/IRC/IEBC/IECC/IFC suite). Source: Cassia County Building Permit Application (2025), Items 11 & 16; Cassia County Administrative Fees (Building Department section).

Sources & verification

Verified against official sources. Last reviewed 2026-08-25.

Fee schedules

Applications & forms

Codes & ordinances

Department & other records

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

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