Idaho · Basement · Free 2026 permit-fee estimator
Basement permit cost in Idaho
On a typical $32,000 basement project, Idaho's statewide median building permit fee is $528 — about 1.65% of cost. Top Boise metros run higher.
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Idaho statewide median
$528
≈ 1.65% of $32,000 project cost
Range: $75 (min) – $1,300 (max)
Top 3 Idaho metros — actual permit fee
The state base × project type stays the same; the metro multiplier is where the swing comes from.
Boise
$634
Metro multiplier: 1.2× statewide base
Coeur d'Alene
$581
Metro multiplier: 1.1× statewide base
Idaho Falls
$502
Metro multiplier: 0.95× statewide base
Idaho permit-fee context
Boise + Coeur d'Alene mid-tier (1.2%); rural counties low. State-issued plumbing/electrical permits separate.
Why basement? Heaviest permit load — building + electrical + plumbing + egress + (sometimes) mechanical. Often the largest permit fee on this list.
What this fee does NOT include
- Plan-review service fees (typically 0.5–1% of cost, separate line)
- Per-trade fees (plumbing, electrical, mechanical — $50–$200 each)
- State-level surcharges (FL DBPR, NJ DCA, OR BCD, etc.)
- Contractor's filing/processing fee
Rule of thumb: budget 1.5–2× the base permit fee for the all-in cost.
Compare basement finishing in Idaho across all lenses
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FAQ — Basement permits in Idaho
How much is a basement permit in Idaho in 2026?
On a typical $32,000 basement project in Idaho, the statewide median permit fee runs $528 — about 1.65% of project cost. Major metros run higher: Boise $634, Coeur d'Alene $581, Idaho Falls $502. Boise + Coeur d'Alene mid-tier (1.2%); rural counties low. State-issued plumbing/electrical permits separate.
Why is the fee higher in major Idaho metros?
Each Idaho city/county sets its own multiplier on top of the state base rate. Boise runs 1.2× because of stricter plan review + structural review + energy-code overhead. Idaho Falls sits lower (0.95×) because of less plan-review depth + simpler intake. Rural counties in Idaho often have flat-fee schedules below even the lowest metro.
What's included in the permit fee vs. what's billed separately?
The permit fee covers the building department's intake + base review. NOT included: plan-review service fees (often a separate line, 0.5–1% of project cost), per-trade fees for plumbing/electrical/mechanical (typically $50–$200 each), and any state-level surcharges (FL adds DBPR 1.5%, NJ adds DCA, OR adds 12% BCD surcharge). Your contractor's filing fee is also separate. Budget 1.5–2× the base permit fee for the all-in cost.
Can I skip the permit and save the fee?
Don't. Working without a required permit fails any future resale inspection (the buyer's inspector WILL flag it), voids your homeowner's insurance for any related claim, and triggers retro-permitting fines that are typically 2–3× the original fee. Idaho treats unpermitted basement work as a separate violation under state building code. The "savings" become a $1,500 problem at resale on a $500 fee.
Other projects in Idaho
Disclaimer: Permit fees are jurisdiction-specific and change frequently. These values are 2026 medians — verify against your local building department's current fee schedule before budgeting.