Deck scope and unit costs
Cash and optional financing
This is a planning estimate, not a contractor bid, engineering design, lender quote, permit approval, inspection report, or HOA approval.
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Financing payment is principal and interest only. Actual borrowing may include fees, closing costs, variable rates, draw rules, lien requirements, underwriting limits, or prepayment terms.
Methodology notes
Base deck cost
Material cost is deck square footage times material cost per square foot. Labor is deck square footage times labor cost per square foot. The complexity multiplier is applied to material, labor, and footings/framing.
Add-ons and contingency
Railings, stairs, pergola or privacy features, demolition, permits, design, and engineering are added after the complexity-adjusted base. Contingency is applied to the full pre-contingency subtotal.
Cash and financing
Cash gap compares total deck budget with cash available. If there is a shortfall, the calculator estimates the monthly payment on the financed portion using standard amortization.
Actual deck costs depend on contractor quotes, local labor rates, lumber and composite pricing, code and permit requirements, footings, soil, access, height, railings, stairs, ledger/flashing details, HOA rules, weather, seasonality, and lender terms. See full disclosure.
Deck cost FAQ
What costs are easy to miss?
Demolition, disposal, permits, engineering, upgraded railings, stairs, lighting, fascia, skirting, hidden ledger damage, and footing surprises are common misses.
What contingency should I use?
Simple low decks may fit 10% to 15%. Elevated decks, poor access, old framing, uncertain footings, custom railings, or tight inspection timelines may need 20% or more.
How does material choice affect maintenance?
Pressure-treated wood and cedar usually need sealing or staining. Composite and PVC often reduce maintenance but can raise upfront material cost and still need cleaning.