Cost to Composite Deck Building in St. Louis, MO

$7,920–$19,360 in St. Louis

12% below the national average · 0.88x cost multiplier

In St. Louis, a composite deck building runs $7,920 to $19,360 on average — about 12% below what homeowners pay nationwide. The Midwest market's labor costs account for most of the gap, with material pricing and local permitting fees adding to the spread. Use the cost table below to compare budget, mid-range, and premium options side by side.

Cost Breakdown in St. Louis

Line Item	Low	Mid	High
Cost per sq ft	$35	$48	$70
Materials	$3,960	$6,600	$12,320
Labor	$3,520	$6,600	$10,560
Permits	$220	$308	$440
Total	$7,920-12% vs. national avg	$14,080-12% vs. national avg	$24,640-12% vs. national avg

Budget

Entry-level composite (Trex Enhance or Fiberon), ground-level, basic railing, simple rectangular layout, $30-$45/sq ft for 300 sq ft

Mid-Range

Mid-tier composite (Trex Select or TimberTech), standard height, upgraded railing system, $45-$65/sq ft for 300 sq ft

Premium

Premium composite (Trex Transcend or Azek), multi-level or elevated, aluminum railing, built-in lighting, $65-$100+/sq ft for 300 sq ft

Material Options

Material prices below are national averages; availability in St. Louis may shift costs slightly.

Material	Cost/Unit	Pros	Cons	Best For
Trex Enhance	$5-$7/sq ft (material)	Most affordable Trex line, good color selection, 25-year warranty	Less scratch resistance than premium lines, fewer color options	Budget-conscious builds where composite is preferred over woodMost affordable Trex line, good color selection, 25-year warranty
Trex Select	$7-$9/sq ft (material)	Better fade and stain resistance, more natural wood grain, 25-year warranty	Mid-range price, still not as premium as Transcend	Most popular mid-range choice, good balance of price and performanceBetter fade and stain resistance, more natural wood grain, 25-year warranty
Trex Transcend	$10-$14/sq ft (material)	Best Trex aesthetics, deep wood grain, superior scratch resistance, 25-year warranty	Premium pricing, heavy boards	Premium builds where appearance is a priorityBest Trex aesthetics, deep wood grain, superior scratch resistance, 25-year warranty
TimberTech / Azek	$7-$12/sq ft (material)	Capped polymer (Azek) is virtually maintenance-free, excellent color retention, 30-50 year warranties	Higher cost, Azek can feel less wood-like underfoot	Homeowners wanting maximum longevity and minimal maintenanceCapped polymer (Azek) is virtually maintenance-free, excellent color retention, 30-50 year warranties
Fiberon	$5.50-$9/sq ft (material)	Competitive pricing, solid warranty, good color options	Less brand recognition, fewer dealer options in some regions	Value-oriented builds, comparable quality to Trex at a lower priceCompetitive pricing, solid warranty, good color options

Other Projects in St. Louis

Full Kitchen Remodel

Basement Finishing

Roof Replacement (Asphalt Shingles)

Back to national average for Composite Deck Building

St. Louis Estimate

Typical Range

$7,920–$19,360

vs. National Average

12% below national

Cost Multiplier

0.88x

Cost Per sq ft

$35–$70

Estimates apply St. Louis's 0.88x regional cost multiplier to national averages. Actual bids vary by contractor, project scope, and timing.

See national average costs →