A composite deck (such as Trex) in Colorado typically costs $30 to $60 per square foot installed, so a 300-square-foot deck usually lands around $9,000 to $18,000. Pressure-treated wood is cheaper up front (roughly $20 to $40 per square foot), but composite wins on lifespan and near-zero maintenance — which matters a lot in Colorado’s intense sun and freeze-thaw swings.
Composite vs. wood in Colorado
- Composite (Trex): higher up-front cost, but no staining or sealing, won’t splinter or rot, and holds up to UV and moisture — typically 25+ year warranties
- Wood: lower up-front cost and a natural look, but needs regular sealing and staining, and Colorado sun is hard on it
Over 15–20 years, composite often comes out even or ahead once you factor in the stain, seal, and board-replacement costs a wood deck racks up at altitude.
What drives the price
- Size and height: elevated decks need more structure, footings, and often stairs and railings
- Railing and stairs: metal, cable, or glass railing costs more than standard composite
- Site and footings: Colorado frost-depth footing requirements add labor
- Add-ons: built-in benches, lighting, pergolas, and skirting
Common questions
Do I need a permit to build a deck in Colorado?
Usually yes — most Front Range jurisdictions (Boulder, Weld, Larimer, Jefferson, Douglas counties) require a permit for decks above a certain height or attached to the house. Your contractor should handle the permit and inspections.
How long does a composite deck last in Colorado?
Quality composite typically carries a 25–50 year warranty and handles Colorado’s sun and freeze-thaw well, versus roughly 10–15 years for a maintained wood deck.
Is Trex worth it over wood?
For most Colorado homeowners, yes — the maintenance savings and UV durability usually justify the higher up-front cost, especially for a deck you plan to keep.
Serving Boulder, Weld, Larimer, Jefferson, and Douglas Counties. Josh Brooks Construction and Renovation Inc. (License CON-24-0152, in business since 2014, 30 years in construction) builds composite and wood decks across the Front Range. For a free estimate, call 720-828-7997 or text 720-453-5095.
Costs are general Colorado ranges; your project may vary. Ask for a free written estimate.
