Deck Cost Calculator

Estimate deck building cost including material, railing, and labor for pressure treated, composite, or cedar.

By Konstantin Iakovlev · Updated April 2026 · Source: HomeAdvisor

ft
ft
Decking Material
Include Railing?

Use the Deck Cost Calculator above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

Building a deck pulls together three cost streams at once: the decking material, the railing, and the labor to assemble it. Seeing the combined number before you commit is what keeps a 2026 budget realistic, particularly since pressure-treated lumber, composite decking, and cedar have each climbed an average of 3 to 5% since 2025. The estimate here reflects those current price levels rather than last year's.

Material cost is aggregated from the deck size and material type you select, with an added charge for railing measured per linear foot. Labor rides on top as a share of that material cost, usually landing between 40% and 60% in line with average contractor rates for 2026. On top of all of it sits a 10 to 15% contingency buffer for the expenses no estimate fully anticipates.

Treat the output as a planning figure, not a quote, because real-world totals shift with your location, which contractors are available, and how involved your design gets. Two line items are easy to overlook: permit fees, which commonly fall in the $100 to $500 range, and demolition if an old deck has to come out first. Railing is the other trap, since its cost is routinely underestimated, and the premium options are where that gap gets widest.

Example: 200 sq ft Composite Deck with Aluminum Railing

  1. 1 Input: Deck Size = 200 sq ft, Deck Material = Composite, Railing Material = Aluminum (50 linear feet), Labor Rate = Average (50%).
  2. 2 Calculation: Composite decking ($12/sq ft) = $2,400. Aluminum railing ($45/linear ft) = $2,250. Total material = $4,650. Labor (50% of material) = $2,325. Contingency (10%) = $465. Estimated permit = $300.
  3. 3 Result: Total Estimated Deck Cost = $7,740.
  4. 4 Context: This estimate provides a solid starting point for your budget. Always obtain multiple quotes from local contractors to get the most accurate pricing for your specific project and to compare services.

Source: HomeAdvisor · Last updated: April 2026

Frequently Asked Questions

How much does it cost to build a deck?
Average costs per square foot: pressure-treated wood $15-25, cedar $20-35, and composite $25-50. A typical 300 sq ft deck costs $4,500-$7,500 for pressure-treated, $6,000-$10,500 for cedar, or $7,500-$15,000 for composite, including labor.
Is composite decking worth the extra cost?
Composite costs 50-100% more upfront but requires virtually no maintenance (no staining, sealing, or replacing rotted boards). Over 20 years, total cost of ownership is often lower than wood when you factor in maintenance every 2-3 years.
Do I need a permit to build a deck?
Usually yes. Most jurisdictions require a building permit for attached decks or decks above a certain height (typically 30 inches). Free-standing, ground-level decks may be exempt. Permits ensure structural safety and compliance with setback requirements.

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