Coeur d'Alene Deck Guide: Permits, Snow, Frost (2026)

Updated October 24, 2026. This guide is general information, not legal or engineering advice. Rules change, so confirm with the agency listed before you start work.

Quick reference

Topic	What to know	Source
Frost depth	24-inch minimum for footings	City of Coeur d'Alene; Kootenai County; City of Post Falls
Snow load (city)	60 psf ground, 40 psf roof	City of Coeur d'Alene
Snow load (county)	Zones A to C: 40, 50 and 60 psf minimum; zone D needs an engineer	Kootenai County
Permit exemption	Only decks of 200 sq ft or less, 30 in or less above grade, not attached and not serving an exit door	City of Coeur d'Alene (IRC R105.2)
Contractor rules	State registration, not licensing; $300,000 minimum general liability	Idaho DOPL; Idaho Code 54-5210
Shoreline	Management area runs 25 ft landward of the ordinary high water mark	Kootenai County Code 8.7.111
Wildfire	Ignition-resistant decking within 10 ft of the home	Idaho Department of Lands

How deep do deck footings need to be?

The City of Coeur d'Alene's adopted design criteria list a 24-inch minimum frost depth, and Kootenai County's residential building guide and the City of Post Falls deck guide use the same figure. Post Falls makes one exception: a freestanding deck may use footings as shallow as 12 inches if it uses one of the city's approved footing types and doesn't sit on pier blocks. Coeur d'Alene also assumes a soil bearing capacity of 1,500 psf when there's no soils investigation, which affects how big each footing has to be.

Do I need a permit?

Usually. Coeur d'Alene builds on the 2018 International Residential Code and lists decks among projects that need a building permit. The only exempt decks are 200 square feet or less, no more than 30 inches above grade at any point, not attached to a house and not serving a required exit door. Post Falls spells out the same triggers in its deck guide and measures grade within a 36-inch strip around the deck. Hayden and Rathdrum issue their own permits, and Kootenai County covers unincorporated areas. In Coeur d'Alene, starting without a required permit can bring a stop work order and a doubled permit fee, and permits generally expire after 180 days with no inspections.

Who can build it?

Idaho requires contractors to register, not to hold a license, according to the Idaho Division of Occupational and Professional Licenses. To register, a contractor must show a general liability policy, including completed operations, of at least $300,000, and must show workers' compensation coverage or explain why it isn't required. Idaho Code 54-5205 exempts small, casual jobs under $2,000 that aren't part of a larger project, and owners working on their own residence. The City of Coeur d'Alene won't accept a permit application without proof of registration or a signed exemption declaration.

What does the climate do to decks?

Coeur d'Alene sits at 2,247 feet on the north shore of Lake Coeur d'Alene. NOAA's 1991 to 2020 normals put average precipitation at about 25.4 inches a year, mostly in the cool season, and recorded temperatures run from −30°F to 109°F. Long wet winters followed by dry summers swell and shrink wood, which leads to checking and worn stain. The city's design snow load is 60 psf on the ground and 40 psf on roofs, so a deck roof needs real structure.

What is under the ground here?

Much of the area from Coeur d'Alene west to Post Falls and north to Rathdrum sits on the Rathdrum Prairie aquifer. Idaho DEQ says its gravel, cobbles and boulders were laid down 8,000 to 18,000 years ago by glacial floods that carried finer silt and sand away. That ground drains well but can be slow to dig, and DEQ notes that contaminants can move easily down through it, which is one more reason to keep stains and cleaners off bare ground.

What about decks on the lake?

Kootenai County's shoreline management area extends 25 feet, measured along the slope, landward of the ordinary high water mark, which the county sets at elevation 2,128.71 feet for Coeur d'Alene Lake. Wood or composite decking is permitted there if it doesn't concentrate runoff and causes no more than minimal disturbance. Each parcel generally gets one stairway or walkway to the water, no more than 4 feet wide, with landings up to 6 feet, and it can't run substantially parallel to the shore.

How can a deck resist wildfire?

The Idaho Department of Lands' wildland fire action guide says embers can collect on and under decks, and that a home within a mile of a natural area is in the "Ember Zone." It recommends heavy timber or noncombustible material for decks, ignition-resistant decking within 10 feet of the house, enclosing the underside with fire-resistant material, and clearing combustibles and vegetation from around and under the deck. Its first defensible space zone extends 30 feet from buildings and decks.

Questions to ask a builder

What is your Idaho contractor registration number, and can I see your certificate of insurance?
Who pulls the permit, and which inspections are included?
How deep will the footings go, and how will the ledger be fastened and flashed?
What snow load is the design using, especially for a roof?
Which decking and railing do you recommend for my sun, snow and fire exposure, and what do the warranties cover?

Common questions

Do I need a permit to build a deck in Coeur d'Alene?

Almost always. Only small, low, freestanding decks that don't serve an exit door are exempt. Any attached deck needs a building permit from the city.

Does Idaho license deck builders?

Idaho requires contractor registration rather than a license. Registered contractors must carry at least $300,000 in general liability insurance.

How deep should deck footings be?

Coeur d'Alene, Post Falls and Kootenai County list a 24-inch minimum frost depth. Confirm the requirement for your lot with your building department.

Coeur d'Alene deck guide (2026)