Residential New Home Building Permit in Twin Falls, Idaho
VerifiedRequired for construction of new one- and two-family dwellings and townhouses in Twin Falls. Reviewed against the 2018 IRC and 2018 IECC with Idaho amendments as locally administered by the City of Twin Falls Building Safety Department, plus City of Twin Falls residential Design Criteria (wind, snow, seismic, frost depth). Applications are submitted via the online CityWorks Building Permit Portal or in person/by email to the Building Safety Department.
Verified 2026-07-03 · Source
When you need this permit
- Building permit required for all new single-family structures; applicants should confirm property setbacks and easements before building
- Plans designed to the 2018 IRC and 2018 IECC with Idaho amendments, and to City of Twin Falls residential Design Criteria: 115 mph gust wind speed, Wind Exposure B (C in some areas), Seismic Design Category B, 24-inch frost depth, 15 psf ground snow load with 25 psf minimum uniform roof design load, 1,500 psf presumed soil bearing pressure
- Engineering (stamped by an Idaho-licensed engineer or architect) required for walls over 10 feet tall, structures over two stories, or any design not using prescriptive IRC methods
- Energy compliance required via prescriptive path or ResCheck
- Electronic PDF plan submittal preferred (saved directly from CAD, not scanned) to bsdpermits@tfid.org or the online CityWorks portal; paper plans (1 set, min 18x24 in, max 24x36 in) also accepted
- Separate MEP (mechanical/electrical/plumbing) permits required for all trade work
- Permit expires 180 days from issuance or the date of the last inspection
Required documents
- Required
Residential New Home Permit Application
City of Twin Falls application for new one- and two-family dwelling construction; apply online via the CityWorks Building Permit Portal (cityworks.tfid.org/permits) or submit to bsdpermits@tfid.org
- Required
Construction Drawings
Site plan, foundation/floor framing plan, floor plan, roof framing plan, and exterior elevations consistent with the 2018 IRC and City of Twin Falls residential Design Criteria
- Required
Energy Compliance Documentation
ResCheck report or prescriptive-method documentation showing compliance with the 2018 IECC as adopted
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Building Permit Fee — valuation $1 to $500 | $22.00 | Per application. City of Twin Falls Master City-Wide Fee Schedule (Building Dept.), footnote Building #1 |
| Building Permit Fee — valuation $501 to $2,000 | $22.00 for the first $500, plus $2.75 for each additional $100 or fraction thereof | City of Twin Falls Master City-Wide Fee Schedule |
| Building Permit Fee — valuation $2,001 to $25,000 | $63.00 for the first $2,000, plus $12.50 for each additional $1,000 or fraction thereof | City of Twin Falls Master City-Wide Fee Schedule |
| Building Permit Fee — valuation $25,001 to $50,000 | $352.00 for the first $25,000, plus $9.00 for each additional $1,000 or fraction thereof | City of Twin Falls Master City-Wide Fee Schedule |
| Building Permit Fee — valuation $50,001 to $100,000 | $580.00 for the first $50,000, plus $6.25 for each additional $1,000 or fraction thereof | City of Twin Falls Master City-Wide Fee Schedule |
| Building Permit Fee — valuation $100,001 to $500,000 | $895.00 for the first $100,000, plus $5.00 for each additional $1,000 or fraction thereof | City of Twin Falls Master City-Wide Fee Schedule |
| Building Permit Fee — valuation $500,001 to $1,000,000 | $2,855.00 for the first $500,000, plus $4.25 for each additional $1,000 or fraction thereof | City of Twin Falls Master City-Wide Fee Schedule |
| Building Permit Fee — valuation $1,000,001 and up | $4,955.00 for the first $1,000,000, plus $2.75 for each additional $1,000 or fraction thereof | City of Twin Falls Master City-Wide Fee Schedule |
| Residential Plan Review Fee | 30% of the building permit fee | City of Twin Falls Master City-Wide Fee Schedule |
| Re-inspection Fee | $50.00 | Charged only if an inspection has failed more than once for the same issue; City of Twin Falls Master City-Wide Fee Schedule |
Review timeline
10–10 business days
Twin Falls’s published plan-review target
Inspection process
- 1
Foundation/Footing
Concrete inspections require property lines marked with string, minimum depth of 12 inches, and construction per City-approved plans; AM (8am-12pm) or PM (1pm-4pm) slot requested
- 2
Rough-In (Mechanical, Electrical, Plumbing, Fireplace, Shear, Fire Alarm/Sprinkler)
All rough-in inspections for MEP, fireplace, shear, fire alarm, and fire sprinklers must be completed and signed off, with windows/doors sealed and penetrations fire-blocked, before a framing inspection can be requested
- 3
Framing
Requested after all rough-in inspections are signed off on the inspection card
- 4
Final (Building, MEP, Firewall, Fire Sprinklers)
All final inspections for mechanical, electrical, plumbing, firewall, and fire sprinklers must be completed and signed off before requesting a building final; Certificate of Occupancy processed within 3 business days of a passed final
Tips
- New single-family residential plan review takes 2 weeks (10 business days) to first review per the City's published plan review timelines, subject to workload/complexity.
- Inspections scheduled through the CityWorks portal by 7:00 AM are same-day; requests called in after midnight are scheduled for the next business day.
- Permits expire 180 days from issuance or the date of the last inspection; reactivation fees may apply.
- Concrete/foundation inspections are given scheduling priority over other inspection types.
Frequently asked questions
- How long does new single-family home plan review take in Twin Falls?
- New single-family plan review takes approximately 2 weeks (10 business days) to first review, subject to current workload and project complexity. Source: City of Twin Falls Building Safety Department, Building Applications & Forms page.
Sources & verification
Verified against official sources. Last reviewed 2026-07-03.
- City of Twin Falls Building Safety Department — official building department
- Building Applications & Forms | City of Twin Falls
- Residential New Home Permit Application (PDF) | City of Twin Falls
- Design Criteria: Residential | City of Twin Falls
- Master City-Wide Fee Schedule (PDF) | City of Twin Falls
- Inspections | City of Twin Falls
- Building Safety Department | City of Twin Falls
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 Twin Falls building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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