Mechanical / HVAC Permit (MEP) in Twin Falls, Idaho
VerifiedRequired for heating, ventilation, air conditioning, and related mechanical installations in Twin Falls, governed by the 2018 International Mechanical Code as adopted with the 2018 IRC/IBC (with Idaho amendments) and locally administered/inspected by the City of Twin Falls Building Safety Department. Applied for via the shared MEP Permit Application.
Verified 2026-07-03 · Source
When you need this permit
- Mechanical permit required for HVAC installation, replacement, or alteration, including furnaces, air handling units, and ductwork
- Apply using the shared MEP Permit Application, checking the Mechanical box and the applicable category
- Hood/HVAC systems requiring plan review: hood equipment must be listed and labeled from the hood manufacturer or engineered
- City of Twin Falls Mechanical Inspection line: (208) 735-7289
Required documents
- Required
Mechanical Electrical Plumbing (MEP) Permit Application
Shared application for mechanical, electrical, and plumbing trade permits; submit via bsdpermits@tfid.org or the CityWorks online permit portal
- Optional
HVAC Plan Review Submittal
Required for commercial HVAC/hood systems needing plan review
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| New Residential (1-2 family dwelling) — 0-2,500 sq ft | $120.00 | Flat fee per trade, based on total floor area excluding garages/covered patios. City of Twin Falls MEP Permit Application |
| New Residential (1-2 family dwelling) — 2,501-4,000 sq ft | $155.00 | City of Twin Falls MEP Permit Application |
| New Residential (1-2 family dwelling) — 4,001+ sq ft | $200.00 | City of Twin Falls MEP Permit Application |
| Other Residential Installation (HVAC remodel/retrofit, temporary electrical under 200 amps for equipment, A/C) | $50.00 | City of Twin Falls MEP Permit Application |
| Commercial (3+ family dwellings and all commercial) — $500 or less | $10.00 | City of Twin Falls MEP Permit Application |
| Commercial — $501 to $10,000 | (project value x $0.02) + $60.00 | City of Twin Falls MEP Permit Application |
| Commercial — $10,001 to $100,000 | ((project value - $10,000) x $0.01) + $260.00 | City of Twin Falls MEP Permit Application |
| Commercial — $100,001 or more | ((project value - $100,000) x $0.005) + $1,160.00 | City of Twin Falls MEP Permit Application |
Review timeline
15–15 business days
Twin Falls’s published plan-review target
Inspection process
- 1
Rough-In
Ductwork and mechanical equipment rough-in before walls closed; must be signed off before framing inspection
- 2
Final
Equipment operational, clearances and combustion air verified; must be signed off before building final inspection
Tips
- Mechanical plan review (for jobs requiring plan review, e.g., commercial hood/HVAC systems) takes 3 weeks to first review per the City's published timelines; simple trade permits without plan review are issued over the counter/portal without that review period.
- To request an inspection, call the Mechanical Inspection line at (208) 735-7289 or schedule via the CityWorks portal by 7:00 AM for same-day service.
Frequently asked questions
- How long does commercial mechanical plan review take in Twin Falls?
- Mechanical plan review takes approximately 3 weeks per the City of Twin Falls Building Safety Department's published plan review timelines, subject to workload and complexity. Source: City of Twin Falls 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
- MEP Permit Application (PDF) | City of Twin Falls
- HVAC Plan Review (PDF) | City of Twin Falls
- Building Applications & Forms | City of Twin Falls
- Inspections | 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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