Plumbing Permit (MEP) in Twin Falls, Idaho
VerifiedRequired for plumbing installation, alteration, or repair work in Twin Falls, governed by the 2017 Idaho State Plumbing Code as locally administered and 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
- Plumbing permit required for installation, alteration, or repair of any plumbing system, fixture, water heater, gas piping, or sewer/water service line
- Governed by the 2017 Idaho State Plumbing Code as locally administered by the City of Twin Falls
- Apply using the shared MEP Permit Application, checking the Plumbing box and the applicable category
- City of Twin Falls Plumbing Inspection line: (208) 735-7299
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
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 (remodel/addition/retrofit, sewer/water line installation or repair) | $50.00 | City of Twin Falls MEP Permit Application |
| Small Work Permit (job value $500 or less; residential water heaters to 100 gal, water softeners, backflow devices) | $10.00 | 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
10–10 business days
Twin Falls’s published plan-review target
Inspection process
- 1
Underground/Slab
Before concrete pour — verify pipe slope, materials, and cleanouts
- 2
Rough-In
After pipes installed, before walls closed; must be signed off before a framing inspection can be requested
- 3
Final
All fixtures connected, water heater verified, cleanouts exposed, no leaks; must be signed off before a building final inspection can be requested
Tips
- The Self-Certification of Plastic Vent Pipe Test form is required for certain plastic vent pipe installations — see the City's Building Applications & Forms page.
- Water heater replacement (up to 100 gallons) may qualify as a Small Work Permit at $10.00 if total job cost is $500 or less.
- To request an inspection, call the Plumbing Inspection line at (208) 735-7299 or schedule via the CityWorks portal by 7:00 AM for same-day service.
Frequently asked questions
- What plumbing code does Twin Falls use?
- The City of Twin Falls administers the 2017 Idaho State Plumbing Code for plumbing permits issued within city limits. Source: City of Twin Falls Design Criteria: Residential 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
- Self Certification Of Plastic Vent Pipe Test (PDF) | City of Twin Falls
- Design Criteria: Residential | 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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