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Deck Construction Budget Calculator
Deck construction ranges $20-$55/sqft depending on material. Pressure-treated: $20-$30. Cedar: $30-$40. Composite: $40-$50. PVC: $45-$60. This calculator sizes your project. Ground conditions affect foundation cost significantly: shallow frost line (Southern US) allows 12" diameter concrete pier foundations; deep frost (Northern US) requires 42"+ piers adding $300-$800. Structural engineering review may be required for decks over 100 sqft or elevated. Building codes have tightened on ledger attachment to the house — failed ledger attachment is the #1 cause of deck collapse.
Total deck cost
$21,900
Decking + framing
$18,000
Railing
$2,800
Stairs
$900
How the math works
400 sqft composite deck at $45/sqft = $18,000. Plus 80' railing × $35 = $2,800. Plus 6-step stairs $900 + $200 permit = $21,900.
Get 3 contractor quotes. DIY pressure-treated at ~$12-$15/sqft saves ~50% but takes weekends. Composite DIY is tricky — joist spacing matters.
How to Use
- Enter sqft and select material.
- Add stairs, railing, and permit cost.
- See total.
Frequently Asked Questions
Which material?
Composite (Trex, TimberTech): 25-30 year life, low maintenance, 2x cost of PT. PT: cheapest, 10-15 year life, annual staining. Cedar: middle ground, natural look, 15-20 year life. PVC: longest life but highest cost.
Railing cost?
Wood: $15-$25/linear foot. Composite: $35-$65/linear foot. Metal (aluminum, steel): $50-$120/linear foot. Code typically requires 36" height residential, 42" commercial.
Permit required?
Yes in most cities for decks over 30" above grade or attached to the house. $100-$300 typical permit. Inspections required mid-build and final.
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