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Accessory Structure Permit in Nampa, Idaho

Required for detached sheds, garages, barns, pole barns, and similar accessory structures on residential properties in Nampa when the structure exceeds 200 square feet. Structures of any size require a permit if hardwired with a 120V electrical system.

Verified 2026-06-29 · Source

When you need this permit

  • Detached accessory structure exceeding 200 square feet requires a building permit
  • Any structure hardwired with a 120V electrical system requires a permit regardless of size
  • Structures under 200 sq ft with no electrical do not require a permit (confirm with Planning & Zoning re: setbacks and easements)
  • Pole barn type structures require structural engineering by an Idaho-licensed engineer
  • Standalone gazebo/pergola structures exceeding 200 sq ft require a permit

Required documents

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Fee schedule

Accessory Structure — building permit (valuation-based)Nampa Exhibit A Schedule of Permit Fees (Dec 2021)
Per Exhibit A valuation table; plan review is 65% of permit fee
Reinspection (after first reinspection for same item)
$55.00 flat fee

Review timeline

Plan reviewNampa’s published plan-review target
7–7 business days

How long did your Accessory Structure Permit permit actually take in Nampa?

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

Inspection process

  1. 1

    Foundation / Footings

    Accessory structures under 600 sq ft require minimum 12-inch depth on 12-inch wide footing (not full 24-inch frost depth). Larger structures require full frost-depth footings.

  2. 2

    Final

    Structure complete per approved plans

See the full Nampa inspection guide — scheduling & re-inspection fees →

Tips

  • Nampa's plan review target for residential accessory structures is 7 working days per the published Plan Review Processing Time Frames (Aug 2024).
  • Garden sheds of 200 sq ft or less with no electrical do not require a building permit — but confirm setbacks and easements with Planning & Zoning.
  • Accessory buildings under 600 sq ft are exempt from the full 24-inch frost-depth requirement; a 12-inch depth on a 12-inch wide footing is the minimum.
  • Pole barn and post-frame structures require structural engineering by an Idaho-licensed engineer.

Frequently asked questions

No permit is required for a shed of 200 square feet or less that is not hardwired with a 120V electrical system. If the shed is over 200 sq ft, or if it will have hardwired electrical, a building permit is required. Always confirm setbacks with Planning & Zoning.

In Nampa, the published Accessory Structure — building permit (valuation-based) is: Per Exhibit A valuation table; plan review is 65% of permit fee. Additional published fees: Reinspection (after first reinspection for same item) — $55.00 flat fee. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Nampa's published plan-review target for an accessory structure permit is 7–7 business days.

You'll need: Accessory Structure Permit Application & Checklist (Oct 2024). Depending on your project, Nampa may also ask for: Pole Barn Handout. See the required-documents checklist on this page for details on each.

Nampa requires 2 inspection(s) for an accessory structure permit, in order: Foundation / Footings, Final. Schedule each through Nampa Building Safety & Code Department ((208) 468-5435).

Apply through Nampa Building Safety & Code Department at 500 12th Ave South, Nampa, ID 83651. Phone: (208) 468-5435, email: buildinginspections@cityofnampa.us. Office hours: Mon–Fri 8:00 AM – 5:00 PM. Official information: https://www.cityofnampa.us/163/Building-Safety-Code.

Nampa, Idaho has adopted: 2018 International Residential Code (IRC); 2018 International Building Code (IBC); 2018 International Existing Building Code (IEBC); 2018 International Fire Code (IFC); 2018 International Energy Conservation Code (IECC) — Residential and Commercial; 2018 International Mechanical Code (IMC); 2018 International Fuel Gas Code (IFGC); 2017 Idaho State Plumbing Code; 2023 National Electrical Code (NEC); 2009 ICC/ANSI/A117.1 (Accessibility); 2015 NFPA A30 Code for Motor Fuel Dispensing Facilities and Repair Garages; 2015 NFPA 99 Health Care Facilities Code. Local amendments apply — see the Nampa overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-06-29.

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

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Accessory Structure Permit in other cities

Ammon, IdahoCaldwell, IdahoMiddleton, IdahoUnincorporated Bingham County, IdahoUnincorporated Canyon County, IdahoConrad, MontanaFruit Heights, UtahGrantsville, Utah

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