This is PermitBase’s published record for Nampa as of 2026-07-20. It has since been superseded — see the current record. A historical record reflects what PermitBase had verified at that time; it may not capture a real-world change the jurisdiction had made but PermitBase had not yet verified, and it includes any errors we later corrected. Snapshots are never edited retroactively.
Nampa building permits
VerifiedNampa, Idaho — as published 2026-07-20.
Verified 2026-06-29 · Source
Codes 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 Commercial2018 International Mechanical Code (IMC)2018 International Fuel Gas Code (IFGC)2017 Idaho State Plumbing Code2023 National Electrical Code (NEC)2009 ICC/ANSI/A117.1 (Accessibility)2015 NFPA A30 Code for Motor Fuel Dispensing Facilities and Repair Garages2015 NFPA 99 Health Care Facilities Code
Permit types & fees
Residential Building Permit (New Construction)
VerifiedRequired for all new one- and two-family dwellings in Nampa. Covers new single-family homes, duplexes, and associated systems. Apply online through the CSS portal or in person at 500 12th Ave S.
Verified 2026-06-29 · Source
Requirements
- Verify proposed use with Planning & Zoning before applying
- Submit application through CSS online portal or in person
- Plans must comply with 2018 IRC and 2018 IECC
- Planning & Zoning Initial Review of Compliance required before submittal
- Approved plans must remain on site during all inspections
- Permit communication sent via email from noreply@cityofnampa.us — do not mark as spam
Required documents
- RequiredNew Residential Building Permit Application & Checklist (Feb 2026)Official Nampa building permit application and submittal checklist for new residential construction; available at cityofnampa.us/DocumentCenter/View/20380
- RequiredConstruction DrawingsComplete plan set including site plan, floor plans, elevations, sections, and structural details
- RequiredEnergy Code Compliance DocumentationRescheck or equivalent demonstrating compliance with 2018 IECC
- OptionalIECC System Commissioning FormRequired for HVAC commissioning per 2018 IECC; available on city website
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Building Permit — valuation $1 to $500 | $22.20 flat | Nampa Exhibit A Schedule of Permit Fees (Dec 21, 2021) |
| Building Permit — valuation $501 to $2,000 | $22.20 for first $500, plus $2.88 per each additional $100 | — |
| Building Permit — valuation $2,001 to $25,000 | $65.40 for first $2,000, plus $13.23 per each additional $1,000 | — |
| Building Permit — valuation $25,001 to $50,000 | $369.69 for first $25,000, plus $9.55 per each additional $1,000 | — |
| Building Permit — valuation $50,001 to $100,000 | $608.44 for first $50,000, plus $6.61 per each additional $1,000 | — |
| Building Permit — valuation $100,001 to $500,000 | $938.94 for first $100,000, plus $5.29 per each additional $1,000 | — |
| Plan Review Fee | 65% of the building permit fee | Assessed at intake; Nampa Exhibit A item 6 |
| New Residential (R-3/R-4) Plumbing/Mechanical/Electrical sub-permit — under 2,000 sq ft habitable area | $180.00 per dwelling unit | Nampa Exhibit A — New Group R sub-contractor permit fee |
| New Residential (R-3/R-4) Plumbing/Mechanical/Electrical sub-permit — 2,000+ sq ft habitable area | $325.00 per dwelling unit | — |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Residential Addition / Remodel Permit
VerifiedRequired for additions, remodels, and structural alterations to existing one- and two-family dwellings in Nampa. Covers room additions, garage conversions, basement finishes, deck construction, and structural modifications.
Verified 2026-06-29 · Source
Requirements
- Finishing an attic, garage, or basement to create living space
- Adding a room, garage, carport, or attached structure
- Moving, removing, or adding walls
- Decks more than 12 inches above grade
- Retaining walls 4 feet or more in height (bottom of footing to top of wall), or 2-foot retaining walls with a slope/surcharge
- Build or enclose a patio cover, porch, or carport
- Replacement of windows or doors where the opening is structurally modified
Required documents
- RequiredResidential Addition Building Permit Application & Checklist (Oct 2024)Official Nampa addition permit application; available at cityofnampa.us/DocumentCenter/View/18792
- OptionalResidential Remodel Permit Application & Checklist (Oct 2024)For remodel scope; available at cityofnampa.us/DocumentCenter/View/18793
- RequiredConstruction DrawingsPlans showing scope of work, dimensions, structural details, and connection to existing structure
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Building Permit — valuation-based per Exhibit A Table | $22.20 (≤$500); $22.20 + $2.88/$100 ($501–$2,000); $65.40 + $13.23/$1,000 ($2,001–$25,000); $369.69 + $9.55/$1,000 ($25,001–$50,000); etc. | Nampa Exhibit A Schedule of Permit Fees (Dec 2021) |
| Plan Review Fee | 65% of the building permit fee | Assessed at intake |
| Plumbing extras (additions/remodels) — fixtures | $36.00 base + $15.00 per fixture | Nampa Exhibit A — Miscellaneous Fees for Plumbing sub-trade permits |
| Electrical extras (additions/remodels) — each circuit extension | $36.00 base + $15.00 per circuit extension | Nampa Exhibit A — Miscellaneous Fees for Electrical sub-trade permits |
| Mechanical extras (additions/remodels) — equipment | $36.00 base + $15.00 per piece of mechanical equipment | Nampa Exhibit A — Miscellaneous Fees for Mechanical sub-trade permits |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Residential Electrical Permit
VerifiedRequired for all electrical wiring installations, equipment changes, or wiring modifications in Nampa residences, including panel upgrades, new circuits, service changes, and EV charger installations. All work must comply with the 2023 National Electrical Code.
Verified 2026-06-29 · Source
Requirements
- All electrical wiring installations, equipment changes, or any wiring installations require a permit before commencing work
- Work must be performed by a state-licensed journeyman electrician employed by a state-licensed electrical contractor
- Homeowner exception: owner of a single-family or two-family dwelling (R-3/U-1 occupancy) may perform own electrical work if residing in the dwelling within 12 months after completion
- Hardship exception: immediate family member may perform work for a family member unable to perform it themselves
Required documents
- RequiredElectrical Permit Application (2024)Nampa Building Department electrical permit application; available at cityofnampa.us/DocumentCenter/View/18813
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| New residential dwelling (R-3/R-4) electrical — under 2,000 sq ft habitable area | $180.00 per dwelling unit | Nampa Exhibit A — New Group R sub-contractor permit fee (includes plumbing, electrical, and mechanical under same flat rate) |
| New residential dwelling (R-3/R-4) electrical — 2,000+ sq ft habitable area | $325.00 per dwelling unit | — |
| Residential electrical (additions/remodels) — base fee | $36.00 base | Nampa Exhibit A — base fee applies to all residential sub-trade permits for additions/remodels |
| Main or sub-main electrical service (residential, additions/remodels) | $55.00 | Nampa Exhibit A — Electrical Extras: 'Main and Sub-Main electrical services (residential only) $55.00' |
| Each circuit extension (residential, additions/remodels) | $15.00 per circuit | Nampa Exhibit A — Electrical Extras |
| Miscellaneous electrical equipment (residential, additions/remodels) | $15.00 per item | Nampa Exhibit A — Electrical Extras |
| Temporary electrical service (residential only) | $55.00 | Nampa Exhibit A — Electrical Extras |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Residential Plumbing Permit
VerifiedRequired for all plumbing piping and drainage work in Nampa residences, including fixture additions, water and sewer line work, and water heater replacements. Governed by the 2017 Idaho State Plumbing Code.
Verified 2026-06-29 · Source
Requirements
- All plumbing piping and drainage work except emergency repairs to leaks or replacing broken fixtures in kind
- Must be performed by a state-licensed journeyman plumber employed by an Idaho-licensed plumbing contractor
- Excavation contractors for sewer/water service lines outside the building envelope must hold Idaho health district septic certification or Idaho public works excavator license
- Homeowner exception: owner of R-3/U-1 occupancy may perform own plumbing if residing in dwelling within 180 days after completion
- Hardship exception: immediate family member may perform work for family member unable to do so
Required documents
- RequiredPlumbing Permit Application (2024)Nampa Building Department plumbing permit application; available at cityofnampa.us/DocumentCenter/View/18815
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| New residential dwelling (R-3/R-4) plumbing — under 2,000 sq ft habitable area | $180.00 per dwelling unit | Nampa Exhibit A — New Group R sub-contractor permit fee (covers installations within the dwelling unit) |
| New residential dwelling (R-3/R-4) plumbing — 2,000+ sq ft habitable area | $325.00 per dwelling unit | — |
| Residential plumbing (additions/remodels) — base fee | $36.00 base | Nampa Exhibit A — base fee for all residential sub-trade addition/remodel permits |
| Sewer line (new or replacement) | $55.00 | Nampa Exhibit A — Plumbing Extras |
| Water line (new or replacement) | $55.00 | Nampa Exhibit A — Plumbing Extras |
| Fixtures (additions and remodels) — per fixture | $15.00 per fixture | Nampa Exhibit A — Plumbing Extras; applies per toilet, sink, shower, bathtub, water heater, etc. |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Residential Mechanical / HVAC Permit
VerifiedRequired for all mechanical equipment installations in Nampa residences, including furnaces, air conditioners, heat pumps, gas piping, ductwork, gas fireplaces, and HVAC replacements. Governed by the 2018 International Mechanical Code and 2018 International Fuel Gas Code.
Verified 2026-06-29 · Source
Requirements
- All mechanical equipment installations require a permit before work begins
- Must be performed by a licensed mechanical contractor holding a valid Idaho Contractor's License
- Gas piping installers must hold a state of Idaho gas piping license
- Homeowner exception: owner of R-3/R-4/U occupancy may perform own mechanical work if residing in dwelling within 180 days after completion
- Hardship exception: immediate family member may perform work for family member unable to do so
- Unvented gas fireplaces require supplemental whole-house ventilation strategy (Nampa local amendment to IMC section 903)
Required documents
- RequiredMechanical Permit Application (2024)Nampa Building Department mechanical permit application; available at cityofnampa.us/DocumentCenter/View/18814
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| New residential dwelling (R-3/R-4) mechanical — under 2,000 sq ft habitable area | $180.00 per dwelling unit | Nampa Exhibit A — New Group R sub-contractor permit fee (covers installations within the dwelling unit) |
| New residential dwelling (R-3/R-4) mechanical — 2,000+ sq ft habitable area | $325.00 per dwelling unit | — |
| Residential mechanical (additions/remodels) — base fee | $36.00 base | Nampa Exhibit A — base fee for all residential sub-trade addition/remodel permits |
| Mechanical equipment (residential, additions/remodels) — per appliance | $15.00 per piece of equipment | Nampa Exhibit A — Mechanical Extras: 'Mechanical equipment (residential only) $15.00' |
| Venting without new appliance (residential only) | $15.00 | Nampa Exhibit A — Mechanical Extras |
| Gas piping pressure test | $15.00 | Nampa Exhibit A — Mechanical Extras |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Residential Roofing Permit (Re-roof)
VerifiedRequired for re-roofing existing residential structures in Nampa, including both overlay and complete tear-off/re-roof projects. Also required for replacement of siding or stucco on existing homes.
Verified 2026-06-29 · Source
Requirements
- Complete roof replacement (tear-off and re-roof)
- Re-roofing overlay
- Replacement of siding or stucco on existing house
Required documents
- RequiredResidential Reroof Permit ApplicationNampa Building Department reroof application; available at cityofnampa.us/DocumentCenter/View/18246
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Residential Reroof — building permit (valuation-based) | Per Exhibit A valuation table; residential re-roofs typically fall in $22.20–$65.40 range for most projects | Nampa Exhibit A Schedule of Permit Fees (Dec 2021) |
| Plan Review Fee | 65% of the building permit fee | Assessed at intake |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Solar Photovoltaic (PV) Permit
VerifiedRequired for installation of rooftop or ground-mounted solar photovoltaic systems on residential properties in Nampa. A dedicated Solar Permit Application packet is available from the city.
Verified 2026-06-29 · Source
Requirements
- Rooftop solar panel installation
- Ground-mounted solar array installation
- Submit the Nampa Solar Permit Application packet
- Electrical work must comply with 2023 NEC
- Structural roof load calculations required
Required documents
- RequiredResidential Solar Permit Application PacketNampa's dedicated solar permit application packet; available at cityofnampa.us/DocumentCenter/View/15796
- RequiredSolar Site PlanRoof plan or ground layout showing panel placement and access pathways
- RequiredElectrical Single-Line DiagramSystem wiring from panels to inverter to main panel
- RequiredStructural Analysis / Roof Load CalculationConfirming existing roof structure can support panel weight; roof snow load in Nampa is 25 PSF minimum
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Solar permit — building permit (valuation-based) | Per Exhibit A valuation table based on project value | Nampa Exhibit A Schedule of Permit Fees (Dec 2021) |
| Plan Review Fee | 65% of the building permit fee | Assessed at intake |
| Electrical sub-permit for solar wiring (additions/remodels) | $36.00 base + $15.00 per circuit extension + $15.00 miscellaneous equipment | Nampa Exhibit A — Electrical Extras |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Electric Vehicle (EV) Charger Permit
VerifiedNampa does not publish a separate EV-charger permit type, but its Residential Electrical Permit page explicitly names EV charger installations as covered work: the permit is 'required for all electrical wiring installations, equipment changes, or wiring modifications in Nampa residences, including panel upgrades, new circuits, service changes, and EV charger installations.' Work must comply with the 2023 NEC and is billed under the same Electrical Extras fee lines used for any new circuit, service, or equipment addition.
Verified 2026-07-20 · Source
Requirements
- A permit is required before commencing any EV charger installation, whether it is a new dedicated circuit, an equipment/outlet addition, or a panel/service upgrade
- Work must be performed by a state-licensed journeyman electrician employed by a state-licensed electrical contractor, per the 2023 National Electrical Code
- Homeowner exception: the owner of a single-family or two-family (R-3/U-1) dwelling may perform the EV charger circuit work themselves if residing in the dwelling within 12 months after completion
- Apply via the Electrical Permit Application (2024) form to the Nampa Building Department
Required documents
- RequiredElectrical Permit Application (2024)Nampa Building Department electrical permit application; describe scope as EV charger installation (new circuit/equipment or service upgrade)
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Residential electrical (additions/remodels) — base fee | $36.00 base | Nampa Exhibit A — base fee applies to all residential sub-trade permits for additions/remodels, including an EV charger circuit |
| Each circuit extension (residential, additions/remodels) — applies to a new dedicated EV charger circuit | $15.00 per circuit | Nampa Exhibit A — Electrical Extras |
| Miscellaneous electrical equipment (residential, additions/remodels) — applies to the EV charger unit itself | $15.00 per item | Nampa Exhibit A — Electrical Extras |
| Main or sub-main electrical service (residential, additions/remodels) — applies if a panel/service upgrade is needed for a higher-amperage Level 2 charger | $55.00 | Nampa Exhibit A — Electrical Extras |
Accessory Dwelling Unit (ADU) Permit
VerifiedRequired for construction of a new accessory dwelling unit on a residential property in Nampa. Nampa provides a dedicated ADU Building Permit Application & Checklist.
Verified 2026-06-29 · Source
Requirements
- Verify ADU is permitted in the property's zoning district with Planning & Zoning
- Submit Residential ADU Building Application & Checklist
- Plans must comply with 2018 IRC
- Trade sub-permits (electrical, plumbing, mechanical) required separately
Required documents
- RequiredResidential ADU Building Application & Checklist (Oct 2024)Nampa's dedicated ADU permit application and checklist; available at cityofnampa.us/DocumentCenter/View/18798
- RequiredConstruction DrawingsFull construction drawings including site plan, floor plans, elevations, and structural details
- RequiredEnergy Code Compliance DocumentationRescheck or equivalent demonstrating 2018 IECC compliance for the ADU
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| ADU Building Permit — valuation-based per Exhibit A | Per Nampa Exhibit A valuation table; plan review is 65% of permit fee | Nampa Exhibit A Schedule of Permit Fees (Dec 2021) |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Accessory Structure Permit
VerifiedRequired 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
Requirements
- 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
- RequiredAccessory Structure Permit Application & Checklist (Oct 2024)Nampa's dedicated accessory structure application; available at cityofnampa.us/DocumentCenter/View/18803
- OptionalPole Barn HandoutNampa guidance for pole barn construction; available at cityofnampa.us/DocumentCenter/View/15867
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Accessory Structure — building permit (valuation-based) | Per Exhibit A valuation table; plan review is 65% of permit fee | Nampa Exhibit A Schedule of Permit Fees (Dec 2021) |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Residential Pool Permit
VerifiedRequired for in-ground and above-ground swimming pools on residential properties in Nampa when the pool exceeds 48 inches in depth or 5,000 gallons. Prefabricated above-ground pools less than 48 inches deep and under 5,000 gallons accessory to an R-3 occupancy are exempt from permit requirements.
Verified 2026-06-29 · Source
Requirements
- In-ground swimming pools require a building permit
- Above-ground pools exceeding 48 inches in depth or 5,000 gallons require a permit
- Prefabricated above-ground pools less than 48 inches deep, under 5,000 gallons, installed entirely above ground, accessory to R-3 — exempt
- Electrical work for pool bonding and pump requires a separate electrical permit
- Fencing around pool required per IRC
Required documents
- RequiredResidential Pool Permit Application & Checklist (Oct 2024)Nampa's dedicated pool permit application; available at cityofnampa.us/DocumentCenter/View/18794
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Pool permit — building permit (valuation-based) | Per Exhibit A valuation table; plan review is 65% of permit fee | Nampa Exhibit A Schedule of Permit Fees (Dec 2021) |
| Reinspection (after first reinspection for same item) | $55.00 flat fee | — |
Sources & verification
Verified against official sources. Last reviewed 2026-06-29.
Fee schedules
Codes & ordinances
Department & other records
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.