Skip to main content
PermitBase

Residential Building Permit (New Construction / Addition / Remodel) in Unincorporated Canyon County, Idaho

Required for all new single-family dwellings, secondary residences, residential additions and alterations in unincorporated Canyon County. Governed by Canyon County's adopted International Residential Code. Application is submitted in person or by mail to the Development Services Department at 111 N. 11th Ave., Suite 310, Caldwell, ID 83605. Plans must be stamped in color and available on site at all inspections.

Verified 2026-06-29 · Source

When you need this permit

  • Building permit required for all new residences, additions, alterations, repairs, improvements, moves, removals, conversions, or demolitions under Canyon County Code §06-01-09(1)
  • Site plan drawn to scale showing property lines, setback measurements, proposed and existing structures, septic and well locations, easement locations (written confirmation from irrigation district may be required), and access road/drive with street label
  • Deed or Sales Agreement required if property has been owned for 60 days or less
  • One (1) set of building plans meeting Canyon County plan requirements (see plan requirement checklist): floor plan at 1/4"=1'-0" or larger, foundation/floor framing plan, all-sides elevations, framing sections, braced wall plan, and additional details as required
  • Southwest District Health (SWDH) preliminary approval for individual septic and drain field (or city hookup approval); community septic exemption applies for subdivision community septic
  • Individual approach approval from the servicing Highway District for each new residence
  • Fire District turn-around approval if residence is 150 feet or more from public road to rear of dwelling
  • Road User's Maintenance Agreement copy if located off a private road or shared access easement
  • Floodplain Development Permit if parcel is in a mapped floodplain
  • Stamped engineering required for: pole/post frame structures, metal buildings, aluminum/metal patio cover systems, walls greater than 12 feet in height, retaining walls taller than 4 feet (from bottom of footing), and any building material or system not described in adopted codes
  • Plans must be printed in color for all on-site inspections
  • Idaho contractor license number required for contractor applicants Contractor

Required documents

Check off what you have — your progress is saved on this device.

Not ready yet — 0 of 5 required documents checked.

This checker covers one permit. A full project usually triggers several — our paid checklist will assemble all of them, from $29 →

Fee schedule

Deposit — New DwellingDeposit collected at permit intake for new dwelling; additional building permit fees based on project value are due at permit pick-up. Building permit fees average approximately 2% of total market value per Canyon County Building Division. Fee schedule effective 3/28/25.
$280.00
Building permit fee — valuation-basedPer-square-foot rate table is embedded as an image in the 2025 Permit Fee Schedule PDF. Canyon County's building department page states fees average 2% of total market value. Fees and impact fees are due upon permit pick-up.
Approximately 2% of total market value (per-sq-ft table as an image in the 2025 Fee Schedule; see https://www.canyoncounty.id.gov/wp-content/uploads/2025/03/2025-PERMIT-FEE-SCHEDULE.pdf)
Reinspection / Special Inspection FeeCanyon County 2025 Permit Fee Schedule
$75.00
Impact fee — fire districtImpact fees per Ordinance 20-018, effective August 3, 2020. Assessed on new construction or addition of service units. Remodeling, rebuilding, additions or replacement without new service units are exempt. Canyon County Impact Fee Schedule PDF.
Varies by fire district: Caldwell Rural $665/unit; Nampa $560/unit; Wilder Rural $825/unit; Middleton Rural $849/unit; Marsing Rural $1,238/unit; Kuna Rural $825/unit; Star Fire Protection $809/unit

Review timeline

Plan reviewTypical estimate — confirm current times with the Unincorporated Canyon County building department
~5–15 business days

How long did your Residential Building Permit (New Construction / Addition / Remodel) permit actually take in Unincorporated Canyon County?

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

Inspection process

  1. 1

    Setbacks and Footings

    Address posted at road; property lines stringlined for setback verification; building location confirmed per approved plans; rebar in place if required; R-10 insulation and vapor barrier verified for daylight basements and slab-on-grade per plan. Request via inspection line (208-454-7460) by 4:00 PM for next business day.

  2. 2

    Pre-Floor

    Anchor bolts installed per code/approved plans; hot-dipped galvanized fasteners used for floor joist hangers to pressure-treated mudsills; pony walls built per design; point loads to footings verified; interior shear and shear blocking per approved plans.

  3. 3

    Shear Panel

    Required shear panels located and fastened per code or engineer spec; galvanized nailing at bottom of all panels into pressure-treated mudsill; OSB with minimum 1" clearance above adjacent slab; portal framing and uplift straps/hold-downs per approved plans; tall wall engineering if applicable.

  4. 4

    Weather Barrier / Window Install

    Windows installed and flashed per manufacturer specs; building wrap installed per manufacturer specs; safety glazing (tempered) and fall protection at required locations; emergency escape and rescue openings at required locations.

  5. 5

    Framing

    All rough-in trade inspections (electrical, plumbing, mechanical via DOPL/DBS as applicable, fire sprinklers if applicable) completed before framing sign-off; trusses per engineered design (engineering on site); air seal and fire stopping complete; stairs meet code; point loads to footings; smoke detectors at required locations; crawl space access size; modifications to MEP systems checked. All colored stamped plans and engineering on site.

  6. 6

    Energy

    All prior framing corrections resolved; attic insulation depth markers present; insulation properly installed; attic access size and locations; garage common wall R-20 (2x6).

  7. 7

    Final

    All trade final inspections (electrical, plumbing, mechanical via DOPL/DBS, fireplace, fire sprinklers as applicable) completed; SWDH, fire district, and driveway requirements met; flood zone elevation certificate from engineer in office if applicable; street address visible from public way; final exterior grading complete; egress/escape/rescue/safety glazing/smoke-CO detectors verified; stairs, guardrails, insulation certificate; garage self-closing door and penetration sealing; crawl space and attic completed per plans.

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

Tips

  • Inspections must be called in by 4:00 PM for next business day scheduling. Call the Inspection Line at 208-454-7460 (open 7 AM – 4 PM). Request AM or PM when calling; Canyon County accommodates where the daily route allows but does not guarantee time of day.
  • Canyon County may take up to 2 business days to complete an inspection in high-demand periods. Time-sensitive inspections (e.g., concrete pours) receive priority. Inform your inspector on the day of the pour of the intended pour time.
  • Colored stamped plans and all engineering must be on site and legible at every inspection. Inspectors will not proceed without them.
  • Work not ready for inspection when the inspector arrives may incur a $75 re-inspection fee.
  • HVAC (mechanical) permits and inspections are handled by the State of Idaho DBS/DOPL since September 1, 2023 — NOT Canyon County. Exception: built-in pellet stoves and built-in woodstoves still require a Canyon County mechanical permit.
  • Electrical and plumbing permits/inspections are also through DOPL, not Canyon County. Contact https://dopl.idaho.gov.
  • All pole/post frame buildings and metal buildings require stamped engineering from an Idaho-licensed design professional. This has been required since June 1, 2023.
  • Accessory structures are NOT allowed on a parcel without an existing residence on the parcel.
  • SWDH preliminary approval for septic/drain field is required before Canyon County will issue a building permit for any new residence or commercial structure.
  • Impact fees (fire district) vary by which fire district covers your parcel — confirm your fire district before estimating total permit cost. Fees range from $560 to $1,238 per residential unit.
  • Payments accepted by Canyon County: Visa, Mastercard, Discover (approximately 3% convenience fee), check, or money order. Credit card authorization form required for card payments.

Frequently asked questions

Yes. Canyon County Code §06-01-09(1) requires a building permit for any construction, addition, alteration, repair, improvement, move, removal, conversion, or demolition of any building or structure in unincorporated Canyon County. Submit the Building Permit Application with full plans to the Development Services Department at 111 N. 11th Ave., Suite 310, Caldwell, ID 83605. Source: Canyon County Code §06-01-09, https://www.canyoncounty.id.gov/building-department/

In Unincorporated Canyon County, the published Deposit — New Dwelling is: $280.00. Additional published fees: Building permit fee — valuation-based — Approximately 2% of total market value (per-sq-ft table as an image in the 2025 Fee Schedule; see https://www.canyoncounty.id.gov/wp-content/uploads/2025/03/2025-PERMIT-FEE-SCHEDULE.pdf); Reinspection / Special Inspection Fee — $75.00; Impact fee — fire district — Varies by fire district: Caldwell Rural $665/unit; Nampa $560/unit; Wilder Rural $825/unit; Middleton Rural $849/unit; Marsing Rural $1,238/unit; Kuna Rural $825/unit; Star Fire Protection $809/unit. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a residential building permit (new construction / addition / remodel) in Unincorporated Canyon County typically runs 5–15 business days. This is an estimate, not a published figure — confirm current review times with Canyon County Development Services Department — Building Division at 208-402-4163.

You'll need: Building Permit Application (Canyon County, Revised 5/31/23); Building Permit Checklist (Revised 1-12-26); Plan Requirements Checklist (Pg. 3 of Building Permit Checklist); Southwest District Health (SWDH) Preliminary Approval; Highway District Approach Approval. Depending on your project, Unincorporated Canyon County may also ask for: Stamped Engineering (when required); Credit Card Authorization Form. See the required-documents checklist on this page for details on each.

Call the Canyon County Inspection Line at 208-454-7460 by 4:00 PM for a next-business-day inspection. The inspection line is open 7 AM – 4 PM, excluding holidays. You may request AM or PM; Canyon County accommodates where possible based on the inspector's daily route. For concrete pours, contact your inspector on the day of the pour to coordinate timing. Source: Canyon County Inspection Policy (May 2025), https://www.canyoncounty.id.gov/wp-content/uploads/2025/05/Canyon-County-Inspection-Policy.pdf

Apply through Canyon County Development Services Department — Building Division at 111 North 11th Avenue, Suite 310, Caldwell, ID 83605. Phone: 208-402-4163, email: BuildingInfo@canyoncounty.id.gov. Office hours: Mon, Tue, Thu, Fri: 8:00 AM – 5:00 PM; Wed: 1:00 PM – 5:00 PM (excluding holidays). Official information: https://www.canyoncounty.id.gov/building-department/.

As of September 1, 2023, HVAC (mechanical) permits and inspections in unincorporated Canyon County are handled by the State of Idaho Division of Building Safety (DBS/DOPL), not Canyon County. Apply at http://dbs.idaho.gov or call 1-800-955-3044. Exception: built-in pellet stoves and built-in woodstoves still require a Canyon County mechanical permit ($80 each appliance, $60 for venting). Source: Canyon County Building Department page, https://www.canyoncounty.id.gov/building-department/

Agricultural buildings are exempt from the building permit requirement under Canyon County Code §06-01-09(4), but you must apply for and receive an AG Exempt Zoning Compliance Permit ($150) before any construction begins. The property must be zoned agricultural, 5 acres or more, receiving an agricultural tax exemption, and the structure must be used exclusively for agricultural purposes — not as a dwelling, public place, employment/processing facility, or RV/boat/camper storage. Source: Canyon County AG Exempt Zoning Compliance Application (Revised 1-7-26), Canyon County Code §06-01-09(4).

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

Other permits in Unincorporated Canyon County

Commercial Building Permit (New Construction / Addition / Tenant Improvement)Accessory Structure Permit (Pole Barns, Sheds, Shops, Carports)Manufactured Home PermitAgricultural Exempt Zoning Compliance PermitBuilt-In Woodstove / Pellet Stove Mechanical PermitDemolition PermitRe-Roof PermitSolar Photovoltaic (PV) PermitEV Charger / EVSE Electrical Permit

Residential Building Permit (New Construction / Addition / Remodel) in other cities

Ammon, IdahoBlackfoot, IdahoBoise, IdahoBuhl, IdahoBurley, IdahoCaldwell, IdahoCascade, IdahoChubbuck, Idaho

Compare residential building permit (new construction / addition / remodel) fees across Idaho →

Look up this fee in a different city →

Embed this data card →

Now live

Build your Unincorporated Canyon County project checklist

Describe your project once and get every permit, document, and fee it triggers in Unincorporated Canyon County — in one checklist. Sign up and pay once to generate it, or go unlimited with Pro.

Get started →