Deck cost calculator
Estimate deck square footage, board layout, fasteners, material range, labor range, railing allowance, and stair allowance.
Home Project Estimates
Deck cost calculator
May 9, 2026
16 ft by 12 ft ground level deck.
Shopping list
- pressure treated decking boards39 ea
- Framing lumber, footings, joist hardware, fastenersProject allowance
- Railing56 linear ft
- StairsNot included
Assumptions
- 10% board waste
- 12 ft boards with 5.5 in face width
- Structural design, permits, and code review are not included
- U.S. near average; pricing data: U.S. near average pricing
Planning estimate only. Not a contractor quote, engineering advice, or permit review.
Calculator setup
16 ft by 12 ft ground level deck.
Shopping list
- pressure treated decking boards39 ea
- Framing lumber, footings, joist hardware, fastenersProject allowance
- Railing56 linear ft
- StairsNot included
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Shared links include the current inputs and unit setting. Saved estimates stay local unless you enable Google Drive sync.
Assumptions in this estimate
- 10% board waste
- 12 ft boards with 5.5 in face width
- Structural design, permits, and code review are not included
- U.S. near average; pricing data: U.S. near average pricing
No saved estimates yet.
What this calculator estimates
This deck cost calculator starts from the measurements and options you enter, then estimates material quantity, waste, cost ranges, labor ranges, and a starter shopping list.
Results adapt to the selected region and unit settings, so the estimate is not locked to one market or measurement system.
Report confusing results, missing options, or assumptions that look off.
How this is calculated
- Quick deck mode calculates deck area as length x width.
- Quick deck board count uses 12 ft boards with 5.5 in face width and 10% waste.
- Board layout mode counts rows from deck width, board face width, selected gap, and selected board direction.
- Picture-frame border boards are added from perimeter divided by selected board length.
- Fastener counts use an estimating allowance at assumed 16 in on-center joist spacing.
- Railing and stairs add separate allowances when selected.
Assumption register
| Item | Low | Typical | High | Source |
|---|---|---|---|---|
| Decking waste | 5 | 10 | 15 | Homewyse wood decking cost calculator Checked 2026-06-21 · medium confidence |
| Deck material | 14 | 30 | 60 | Homewyse wood decking installed benchmark Checked 2026-06-21 · low confidence |
Last reviewed: May 9, 2026. These values are planning defaults, not live prices.
Common mistakes
- Estimating decking only and forgetting framing, hardware, railings, stairs, and footings.
- Buying boards without checking direction, butt joints, border boards, and fastener system.
- Treating elevated decks like ground-level platforms.
- Ignoring code requirements and structural design.
FAQ
Can this replace a deck design?
No. A deck needs local-code and structural review before building.
When should you use board layout mode?
Use board layout mode when you are buying deck boards and need a more practical count based on board length, direction, gap, border, and fastener type.
Why are deck ranges wide?
Height, footing conditions, railing, stairs, material, and hardware can change cost heavily.
Does this include demolition?
No. Removing an old deck should be estimated separately.
Can this deck cost calculator estimate cost by region?
Yes. The calculator uses the selected region and unit settings to adapt quantities, cost ranges, labor ranges, and assumptions.
How should you use the result before buying materials?
Use the result as a planning estimate, then compare it with a current supplier cart, contractor quote, or local project conditions before committing.
Limitations
This calculator is for early budgeting and decking takeoff only. It is not a structural design tool and does not verify spans, joist layout, footings, permits, or code.
This estimate is for planning only. It is not a contractor quote, engineering advice, or permit review.
Next step
Measure once more, compare the result with a real quote or shopping cart, and review the assumptions before buying materials.
Read the how much deck material do I need guide
Read the how many deck boards do I need guide
Read the how much does a 12x12 deck cost guide
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