Cost Calculator AI
Construction & ContractorsOutdoor Living

Deck Cost Calculator

Calculate pressure-treated, cedar, composite Trex, and PVC deck costs including framing, footings, railings, and stairs.

Calculation Results

Deck Construction Cost Formula

Total Deck Cost = Substructure Framing + Decking Boards + Railings + Footings & Stairs + Labor
  • Substructure Framing: Pressure-treated 2x8 or 2x10 joists, ledger board, and beams (~$9.50/sq ft ground, ~$14/sq ft elevated).
  • Decking Surface: Pressure-treated ($6.50/sq ft), Cedar ($11.50/sq ft), Composite Trex ($17.50/sq ft), Capped PVC ($24/sq ft).
  • Railings: $28/lin ft for wood, $55/lin ft for composite/aluminum systems.

Step-by-Step Worked Example

Scenario: Building a 16 ft × 20 ft (320 sq ft) composite Trex deck with railings and professional labor

Calculation Steps:

  1. Substructure Framing = 320 sq ft × $9.50 = $3,040
  2. Composite Surface Decking = 320 sq ft × $17.50 = $5,600
  3. Composite Railing = 56 linear ft × $55 = $3,080
  4. Concrete Footings & Stairs = $1,340
  5. Total Materials = $3,040 + $5,600 + $3,080 + $1,340 = $13,060
  6. Installation Labor = 320 sq ft × $18.00 = $5,760
  7. Total Project Cost = $13,060 + $5,760 = $18,820
Result: The estimated turnkey composite deck project is $18,820 ($58.81/sq ft).

How to Use This Calculator

  1. 1Enter deck length and width in feet.
  2. 2Select ground-level vs elevated second-story deck.
  3. 3Choose decking board material and railing requirements.

Assumptions & Limitations

  • Estimates are based on standard national averages and current prevailing construction materials and contractor rates.
  • Actual trade bids may fluctuate according to local building code requirements, permit fees, and site topography.
  • Always obtain multiple written bids from licensed, bonded, and insured contractors before commencing work.

Frequently Asked Questions

Is composite decking worth the higher price over wood?

Composite decking costs 50% to 100% more upfront but never requires sanding, staining, or power-wash sealing, saving $600 to $1,200 every two years in maintenance.

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