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Residential Addition / Remodel Permit in Nampa, Idaho

Required 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

When you need this permit

  • 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

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Fee schedule

Building Permit — valuation-based per Exhibit A TableNampa Exhibit A Schedule of Permit Fees (Dec 2021)
$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.
Plan Review FeeAssessed at intake
65% of the building permit fee
Plumbing extras (additions/remodels) — fixturesNampa Exhibit A — Miscellaneous Fees for Plumbing sub-trade permits
$36.00 base + $15.00 per fixture
Electrical extras (additions/remodels) — each circuit extensionNampa Exhibit A — Miscellaneous Fees for Electrical sub-trade permits
$36.00 base + $15.00 per circuit extension
Mechanical extras (additions/remodels) — equipmentNampa Exhibit A — Miscellaneous Fees for Mechanical sub-trade permits
$36.00 base + $15.00 per piece of mechanical equipment
Reinspection (after first reinspection for same item)
$55.00 flat fee

Review timeline

Plan reviewNampa’s published plan-review target
10–10 business days

How long did your Residential Addition / Remodel Permit permit actually take in Nampa?

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

Inspection process

  1. 1

    Framing / Structural

    After framing complete, before walls covered — verify structure, connections, blocking, egress

  2. 2

    MEP Rough-In

    Electrical, plumbing, and mechanical rough-ins before wall cover — may require separate trade permits

  3. 3

    Insulation

    Insulation and vapor barrier before drywall (if conditioned space added)

  4. 4

    Final

    All work complete per approved plans; Certificate of Completion issued

See the full Nampa inspection guide — scheduling & re-inspection fees →

Tips

  • Nampa's plan review target for residential additions is 10 working days per the published Plan Review Processing Time Frames (Aug 2024).
  • Decks more than 12 inches above grade require a permit. Decks 30 inches or more above adjacent grade require guardrails per the 2018 IRC.
  • Retaining walls 4 feet or more in height (footing bottom to wall top) require a permit. A 2-foot retaining wall with a slope or surcharge also requires a permit and structural engineering.
  • Interior finishes (painting, floor covering, cabinets, countertops) are generally exempt from permit requirements unless framing is exposed or plumbing is relocated.
  • Low-voltage outdoor lighting does not require an electrical permit; 110-volt outdoor lighting does.

Frequently asked questions

Yes, if the project creates living space or involves framing, electrical, plumbing, or mechanical work. Interior work such as paint, flooring, cabinets, and countertops is generally exempt.

In Nampa, the published Building Permit — valuation-based per Exhibit A Table is: $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.. Additional published fees: Plan Review Fee — 65% of the building permit fee; Plumbing extras (additions/remodels) — fixtures — $36.00 base + $15.00 per fixture; Electrical extras (additions/remodels) — each circuit extension — $36.00 base + $15.00 per circuit extension; Mechanical extras (additions/remodels) — equipment — $36.00 base + $15.00 per piece of mechanical equipment; Reinspection (after first reinspection for same item) — $55.00 flat fee. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Nampa's published plan-review target for a residential addition / remodel permit is 10–10 business days.

You'll need: Residential Addition Building Permit Application & Checklist (Oct 2024); Construction Drawings. Depending on your project, Nampa may also ask for: Residential Remodel Permit Application & Checklist (Oct 2024). See the required-documents checklist on this page for details on each.

Nampa requires 4 inspection(s) for a residential addition / remodel permit, in order: Framing / Structural, MEP Rough-In, Insulation, Final. Schedule each through Nampa Building Safety & Code Department ((208) 468-5435).

Apply through Nampa Building Safety & Code Department at 500 12th Ave South, Nampa, ID 83651. Phone: (208) 468-5435, email: buildinginspections@cityofnampa.us. Office hours: Mon–Fri 8:00 AM – 5:00 PM. Official information: https://www.cityofnampa.us/163/Building-Safety-Code.

Nampa, Idaho has 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 Commercial; 2018 International Mechanical Code (IMC); 2018 International Fuel Gas Code (IFGC); 2017 Idaho State Plumbing Code; 2023 National Electrical Code (NEC); 2009 ICC/ANSI/A117.1 (Accessibility); 2015 NFPA A30 Code for Motor Fuel Dispensing Facilities and Repair Garages; 2015 NFPA 99 Health Care Facilities Code. Local amendments apply — see the Nampa overview page for the full list.

Yes, if the deck is more than 12 inches above grade. Apply for a Residential Addition permit through the CSS online portal or in person at 500 12th Ave S.

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

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Residential Addition / Remodel Permit in other cities

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