Deck Building Cost in Idaho Falls, ID (2026)
Updated October 2026 · Idaho Falls, ID · index 0.97
How much does it cost to build a deck in Idaho Falls? For a 300 sq ft deck with pressure-treated wood, homeowners in Idaho Falls, ID pay about $10,900 on average, and most quotes land between $7,550 and $14,300 — $25 to $48 per sq ft. The price covers plans and the permit, footings, a framed and flashed structure, the deck boards, railing, one set of stairs, fascia and cleanup.
The deck building price in Idaho Falls runs 3% below the U.S. average: construction labor in the Idaho Falls area runs 5% below the national mean, materials 1% below. The same job averages $11,300 nationally and about $10,600 at the Idaho statewide index.
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Deck building price in Idaho Falls by decking material
What a 300 sq ft deck costs in Idaho Falls with each decking material, installed:
| Option | Average · range |
|---|---|
| Pressure-treated woodtreated pine or fir boards, stained and sealed$36 per sq ft | $10,900$7,550 – $14,300 |
| Capped compositehidden fasteners and a picture-frame border$44 per sq ft | $13,100$9,300 – $16,900 |
The least expensive option in Idaho Falls is pressure-treated wood, at about $10,900; capped composite averages $13,100, 1.2 times as much.
Cost to build a deck in Idaho Falls by size
With pressure-treated wood, priced for Idaho Falls, ID:
| Size | Average · range |
|---|---|
| A 200 sq ft deck$39 per sq ft | $7,850$5,350 – $10,300 |
| A 300 sq ft deck$36 per sq ft | $10,900$7,550 – $14,300 |
| A 400 sq ft deck$35 per sq ft | $14,000$9,750 – $18,200 |
Some costs stay the same whatever the size — plans, permit and layout, one set of stairs (4 steps), final inspection and cleanup — so a bigger job costs less per unit: $35 per sq ft for a 400 sq ft deck against $39 for a 200 sq ft deck.
What a deck building in Idaho Falls includes
Line by line, the $10,900 average for a 300 sq ft deck breaks down like this: 47% labor, 53% materials and equipment.
| Line | Low – high |
|---|---|
| Plans, permit and layout | $360 – $1,050 |
| Ground prep, fabric and gravel | $210 – $540 |
| Footings below the frost line | $400 – $800 |
| Flashed ledger on the house | $240 – $470 |
| 6x6 posts | $270 – $540 |
| Beams | $240 – $470 |
| Joist framing with hangers | $1,400 – $2,350 |
| Deck boards | $1,300 – $1,950 |
| One set of stairs (4 steps) | $500 – $1,000 |
| Railing | $1,850 – $3,200 |
| Fascia and skirting | $350 – $830 |
| Final inspection and cleanup | $140 – $360 |
| Stain and seal, two coats | $320 – $750 |
Each line is the price book's U.S. rate for that step, scaled by 0.74 to the installed price published sources give for the whole job (see how these prices are built), times Idaho Falls's index of 0.97; permit fees are not scaled.
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What affects deck building prices in Idaho Falls
Labor and materials in Idaho Falls
Construction wages in the Idaho Falls metro run 6% below the U.S. mean (BLS, May 2025), and specialty-contractor pay in the city's county moves that up by 1%, to 5% below the national mean. Materials in the area's ZIP codes price 1% below the national average. Together they give Idaho Falls a construction cost index of 0.97.
Where Idaho Falls sits in Idaho
Idaho Falls ties for the most expensive of the 5 Idaho cities in our index, against a statewide index of 0.94. Pocatello is the least expensive at 0.92.
Against the rest of the country
Of the 306 U.S. cities in JobFlex's index, Idaho Falls ranks 188th from the most expensive. The job that averages $10,900 here averages $11,300 at the national rate.
Frost depth in Idaho
Deck footings go below the frost line, or they heave by the second spring. The typical code frost depth in Idaho is about 30 in.. Your building department sets the exact figure.
The deck code in Idaho
Decks here are built to the Idaho Residential Code (2018 IRC with Idaho amendments). Guards are required at 36 in. where the deck is more than 30 in. up, and stair risers can be up to 7.75 in.
What decks are built of in Idaho
Most used on decks in the Mountain states: capped composite, then treated hem-fir or fir 2x6, then cedar.
Sales tax in Idaho
Idaho's base state sales tax is 6%, and cities and counties can add their own. How it applies to a home-improvement contract varies, so ask whether a quote includes it. Prices on this page are before tax.
What a Idaho Falls contractor will ask before quoting
- Reuse the frame or rebuild?
- Height, railing style and stairs
- Board brand and color
Deck building cost in other Idaho cities
A 300 sq ft deck with pressure-treated wood averages $10,900 in Idaho Falls; $10,900 in Meridian, $10,400 in Pocatello, $10,900 in Boise.
| City | Average · range |
|---|---|
| Meridian, IDsame as Idaho Falls | $10,900$7,550 – $14,300 |
| Pocatello, ID5% less | $10,400$7,150 – $13,500 |
| Boise, IDsame as Idaho Falls | $10,900$7,550 – $14,300 |
| Coeur d'Alene, ID1% less | $10,800$7,450 – $14,100 |
deck building price in Idaho Falls: questions
How much does it cost to build a deck in Idaho Falls, ID?
About $10,900 for a 300 sq ft deck with pressure-treated wood, and most Idaho Falls quotes fall between $7,550 and $14,300. That is 3% below the U.S. average, where the same job averages $11,300.
What is the deck price per square foot in Idaho Falls?
$25 to $48 per sq ft, about $36 on average with pressure-treated wood. Smaller jobs cost more per unit, because the fixed costs are spread over less.
How much is a 400 sq ft deck in Idaho Falls?
$9,750 to $18,200, about $14,000 on average, with pressure-treated wood — $35 per sq ft.
Do you need a permit for deck building in Idaho Falls?
Yes — a new deck needs a permit nearly everywhere, Idaho Falls included. In Idaho, decks follow the Idaho Residential Code (2018 IRC with Idaho amendments). The prices on this page carry $360–$1,050 for plans, permit and layout.
Does the price include sales tax in Idaho?
No. The prices here are before tax; Idaho's base state rate is 6%, plus any local rate.
What decking do people choose in Idaho?
Most used on decks in the Mountain states: capped composite, then treated hem-fir or fir 2x6, then cedar.
Other home projects in Idaho Falls
Deck building cost in Idaho
How these prices are built
Every price on this page comes from JobFlex's contractor price book: what a homeowner pays a licensed contractor for each step of the job, as a U.S. national average per unit, with the contractor's overhead and profit included and sales tax left out. The deck building is priced step by step, then multiplied by Idaho Falls's construction cost index of 0.97.
Where the price book's steps for an option add up to more than 20% over the installed price a published source gives for the whole job, every step but a permit fee is scaled down to the middle of that range: pressure-treated wood × 0.74 (HomeGuide 2026: $25–$50 per sq ft); capped composite × 0.80 (Ergeon 2026: $30–$60 per sq ft).
The index weighs local construction wages (BLS Occupational Employment and Wage Statistics, May 2025) at 60% and the area's material prices (Craftsman ZIP-area factors) at 40%. Published indices for Idaho Falls, each on its own base: HUD 0.97, Craftsman 0.92. Treat any city figure as about ±5%; a contractor's quote for your house is the number to plan with.
Contractors in Idaho Falls build quotes like these with JobFlex's Deck Studio.
- HomeGuide 2026: pressure-treated deck $25-$50/sqft installed, labor $15-$30/sqft
- Ergeon 2026: composite deck $30-$60/sqft installed
- HomeGuide 2026: composite railing $25-$60/lf, aluminum $50-$200/lf installed