Does a deck require a permit in Nampa?

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.

Do I need a permit to finish my basement in Nampa?

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.

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

Req
Residential Addition Building Permit Application & Checklist (Oct 2024)
Official Nampa addition permit application; available at cityofnampa.us/DocumentCenter/View/18792
Opt
Residential Remodel Permit Application & Checklist (Oct 2024)
For remodel scope; available at cityofnampa.us/DocumentCenter/View/18793
Req
Construction Drawings
Plans 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	—

Review timeline

10–10 business days

Nampa’s published plan-review target

Inspection process

1
Framing / Structural
After framing complete, before walls covered — verify structure, connections, blocking, egress
2
MEP Rough-In
Electrical, plumbing, and mechanical rough-ins before wall cover — may require separate trade permits
3
Insulation
Insulation and vapor barrier before drywall (if conditioned space added)
4
Final
All work complete per approved plans; Certificate of Completion issued

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

Does a deck require a permit in Nampa?: 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.
Do I need a permit to finish my basement in Nampa?: 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.

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.

Other permits in Nampa

Residential Building Permit (New Construction)Residential Electrical Permit Residential Plumbing Permit Residential Mechanical / HVAC Permit Residential Roofing Permit (Re-roof)Solar Photovoltaic (PV) Permit Accessory Dwelling Unit (ADU) Permit Accessory Structure Permit Residential Pool Permit

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