Deck Cost in Colorado: Composite vs Cedar Over Ten Years

A new deck in Colorado is priced by installed square footage and height in 2026. Angi’s Denver deck building cost data puts cedar at $25–$45 per square foot installed, with Denver-specific guides from Weatherguard Colorado and HomeBlue landing around $29–$33/sq ft. Composite (Trex, TimberTech) runs $30–$55/sq ft installed nationally on Angi, with Denver metro figures commonly $34–$36/sq ft. On a 300-square-foot surface, that is roughly $8,700–$9,900 for cedar and $10,200–$10,800 for composite at the Denver-specific bands—before stairs, multi-level layouts, or difficult access add structure cost. Elevated decks with full permitting often land well above those surface-only math examples because footings, posts, and beams dominate the budget.

All figures in this article are estimated ranges for planning purposes. Actual pricing varies by scope, home condition, material selections, and jurisdiction. The only reliable number for your project comes from an in-home walk-through.

Decks in Colorado take more abuse than decks in Oregon or Georgia: intense UV fades wood and heats composite surfaces; freeze-thaw cycles test footing depth; snow load on elevated decks in the foothills can exceed plains assumptions. The right question is not only “cedar or composite?” but whether footings go below the frost line, whether the ledger is flashed correctly into the house wrap, and whether your city treats a 14-inch-high platform as permit-free (most do not in Denver).

Footings, frost depth, and snow load

Front Range footings typically extend 36–42 inches below grade depending on jurisdiction and soil—deeper in foothill communities with heavier frost penetration. Undersized footings heave posts and twist railings within a few seasons. Elevated decks in the mountains may need engineering for snow load that exceeds Denver plain assumptions.

Ledger attachment to the house is the other failure point. Proper flashing integration with existing siding and housewrap prevents rot in the rim joist—common when decks are bolted through old stucco without a pan.

What pushes cost up

• Height — taller posts, longer stairs, guard requirements.
• Multi-level layouts — additional beams and footings.
• Built-in seating, pergolas, or outdoor kitchen rough-in.
• Difficult access — hillside lots in Golden or Evergreen.
• HOA design review delays — common in master-planned communities.

See how decks integrate with broader outdoor living in our Arvada home renovation overview.

Financing a deck alongside other exterior work? See financing options for qualified homeowners.

Deck building with Apollo means engineered footings, permitted structures, and material choices explained for your elevation—not a cookie-cutter platform that fails inspection at 31 inches above grade.

Ground-level patios vs raised decks

Concrete patios (see our concrete cost guide for Angi’s $6–$11/sq ft flatwork bands) compete with low wood platforms on flat lots. Wood wins on sloped backyards where grading for concrete is expensive.

Raised decks preserve views on walkout lots in Westminster and Broomfield; ground-level decks suit flat Aurora lots where frost heave is managed with deeper footings anyway.

Railing code and safety

Guards are required where walking surfaces are 30 inches or more above grade within 36 inches horizontally from the edge (IRC guard provisions adopted locally). Baluster spacing must prevent a 4-inch sphere passing through—critical for families with young children. Cable railings need tension maintenance after winter; glass panels need periodic cleaning in hail-prone dust seasons.

Under-deck drainage and storage

Dry-under systems create usable patio space beneath elevated decks—popular when the walkout basement door sits under the main deck. Budget them within the elevated deck’s installed total rather than as a separate national per-foot add-on.

Material lead times and seasonal booking

Composite decking colors go out of stock after spring demand; order extra material for diagonal layouts and offcuts. Cedar availability fluctuates with western mill output—lock lumber packages when footings pass inspection, not at contract signing if lead times stretch six weeks.

Book deck crews before Memorial Day if you want summer use; fall installs save modestly on labor when painters and roofers are busy but concrete footings still need frost-aware cure windows.

Getting a number you can trust

Online calculators and phone quotes without a site visit miss the conditions that move Colorado jobs—panel capacity, soil movement, hail history, permit jurisdiction, and the shape of your existing structure. A walk-through takes an hour; guessing wrong costs months of regret and change orders.

At Apollo, we use walk-throughs to separate must-fix items from nice-to-have upgrades, then align scope with budget bands before design hours stack up. Bring your inspiration photos, a rough budget range, and questions about timeline; leave with a written scope outline and next steps—not pressure to sign that day.

Compare contractors on identical scope documents, verify insurance and license status for the city or county that will issue your permit, and read payment terms carefully. The lowest bid is rarely the same work as the middle bid on Front Range remodels.

Regional price notes across the Front Range

Denver metro deck pricing tracks Angi, Weatherguard Colorado, and HomeBlue guides above; Boulder County jobs add energy and sometimes wildfire-related review (City of Boulder 2025 fee schedule and WUI code). Unincorporated Jefferson and Arapahoe parcels route through county building departments—your contractor must match the parcel, not the mailing city name.

Spring and early summer book fastest on the Front Range; fall often offers better crew availability for interior-heavy scopes. Winter exterior work is possible with weather windows but rarely the cheapest calendar slot.

When you are ready to compare real numbers for your address, request a free walk-through. We document existing conditions, permit path, and budget bands before you spend money on drawings or deposits.

Document existing conditions with photos before you interview contractors—panel labels, foundation cracks, roof age, and permit history speed accurate scopes. If a previous owner finished basement or deck work without permits, bringing it legal during your project adds cost but prevents sale and insurance problems later.

Ask each bidder which permit office they will use, what valuation they will declare, and whether haul-off, protection, and final cleaning are included. Front Range projects that skip those line items in writing usually grow in cost once work starts.