ID State Guide
Home improvement costs in Idaho.
Locally calibrated cost data for fifty trades, plus the permit rules, code gotchas, and building conditions that actually matter when you plan a project in Idaho.
Updated May 2026
Cost calibration
Idaho costs are about 7% below the national average.
Idaho is moderately affordable, but the Boise metro (Treasure Valley) has seen explosive growth that pushed local costs well above the statewide baseline. Mountain snow loads, wildfire WUI exposure, expansive soils, and high radon are the recurring factors. Northern and central Idaho add significant snow and seismic considerations.
BEA RPP
0.927×
Regional Price Parity
BLS Labor Index
0.93×
Trades-labor metro adjustment
Permits
Permits in Idaho.
Idaho enforces the Idaho Residential Code (IRC-based) statewide through the Division of Building Safety, with local enforcement. Electrical, plumbing, and HVAC are state-licensed. Mountain and wildfire areas add review.
Where to file: City or county building department, or the state Division of Building Safety in some areas. Boise, Meridian, Coeur d'Alene have portals. Plan review 1-3 weeks.
| Trade | Required when | Citation | Typical fee | Homeowner DIY? |
|---|---|---|---|---|
| Plumbing | In-wall work, fixtures, water heater, gas | ID DBS plumbing | $60-$225 | ConditionalOwner-occupied; gas requires licensed plumber |
| Electrical | Circuits, panel, service, EV charger | ID DBS; NEC | $60-$225 | ConditionalOwner-occupied allowed with state permit |
| Mechanical (HVAC) | Furnace/AC, ductwork, refrigerant | ID mechanical | $75-$250 | NoLicensed contractor for refrigerant + gas |
| Building (structural) | Additions, structural mods, decks | Idaho Residential Code | $100-$700 | YesMountain snow loads + expansive soils need engineering |
| Roofing | Re-roofs, structural deck repair | Local | $75-$250 | YesHeavy snow loads in the mountains; ice-and-water shield |
| WUI / wildfire | Foothill + forest interface zones | Local WUI | $100-$400 | YesClass A roof + ignition-resistant materials in fire zones |
Code highlights
What catches DIYers in Idaho.
Five code rules that show up on inspector reports more than any others. Catch them before demo day.
Boise-metro growth surge
The Treasure Valley (Boise/Meridian/Nampa) has grown explosively, tightening the trades market and pushing local labor 15-25% above the rural Idaho baseline. Lead times and pricing reflect the boom.
Mountain snow loads
Central and northern Idaho mountain communities (Sun Valley, McCall, Sandpoint) carry ground snow loads of 75-150+ psf. Roof structures and additions need verified load calculations. Valley homes use much lighter loads.
Wildfire WUI
Idaho's forested foothills and mountains are wildfire-prone. WUI zones require Class A roofs and ignition-resistant materials, and insurance availability is an increasing concern in fire-prone counties.
Expansive + collapsible soils
Parts of Idaho have expansive clay or collapsible loess soils that crack or settle foundations. Additions need a soils assessment and often engineered foundations. Drainage management matters.
Radon
Idaho has elevated radon in much of the state. Testing is common at sale. Passive mitigation during construction is cheap; retrofit $800-$2,000.
Local building conditions
What changes in Idaho.
Idaho home improvement is shaped by Boise-metro growth, mountain snow loads, wildfire WUI exposure, problem soils, and high radon. Conditions vary sharply between the valleys and the mountains.
Boise-metro growth
Treasure Valley 15-25% above rural baseline
Tight trades market; longer lead times and higher pricing in the Boise area.
Snow load
30 psf (valleys), 75-150+ psf (mountains)
Mountain additions need heavy-snow framing. Verify load calcs before a roof project.
Wildfire (WUI)
Forested foothills + mountains
Class A roof + ignition-resistant materials in fire zones. Insurance availability tightening.
Problem soils
Expansive clay + collapsible loess
Foundations crack or settle. Soils assessment + engineered foundations for additions.
Radon
Elevated in much of the state
Testing common at sale. Passive mitigation cheap during construction.
Frost line depth
24-36 inches (valleys), deeper at altitude
Standard valley footings; deeper in the mountains.
Cost data
Top home improvement projects in Idaho.
Hire-it-out cost ranges for the most-searched projects, calibrated to Idaho labor + materials.
| Project | Cost range | Difficulty |
|---|---|---|
| AC Replacement → | $4,200–$8,400 | Hard |
| Attic Insulation → | $1,400–$3,200 | Moderate |
| Backsplash Tile → | $700–$2,300 | Easy |
| Baseboard & Trim Installation → | $600–$2,800 | Easy |
| Basement Finishing → | $13,900–$46,400 | Hard |
| Bathroom Remodel → | $6,000–$16,700 | Moderate |
| Bathroom Vanity Installation → | $400–$1,400 | Moderate |
| Cabinet Refacing → | $3,700–$11,100 | Moderate |
| Carpet Installation → | $600–$2,300 | Moderate |
| Ceiling Fan Installation → | $100–$600 | Moderate |
Need a specific project priced for your zip? Open the calculator →
Local contractors
Idaho Local Pros.
Idaho is on the Local Pros roadmap. We are sourcing from r/Idaho, r/Boise, r/CoeurDalene threads, NextDoor recommendations, and ID DBS licensing records. Mountain snow-load and WUI specialists noted separately.
See Idaho Local Pros →Plan your Idaho project