Decks planning tool

Deck Cost Calculator

Start with sourced national planning ranges or switch to Advanced assumptions for scoped local rates. Use the result to compare options, then confirm the same scope with local quotes.

Deck cost planning

Build a scoped deck cost range

Start with sourced national planning ranges, then verify local scope and quotes. This is not a quote.

Deck length (ft)Overall rectangular deck length.

Deck width (ft)Overall rectangular deck width.

Deck heightHeight is shown with your project, but it does not change this estimate or size the stairs.

Existing deck removalNo source-backed removal price is included, and removal is not folded into permit/design.

Decking materialUses a national sourced material planning range; local quotes may differ.

RailingNonePartialFull (three exposed sides)

StairsWe price the area from the width and horizontal run you enter. A local plan or quote still needs to cover the stair layout and structure.

Include permit/design planning allowance

The sourced range covers national permit planning only; design requirements and fees must be verified locally.

Contingency bufferOptional user-selected planning buffer applied to the complete subtotal; it is not sourced pricing or a quote.

Material comparison

All options use the same 10% waste-adjusted planning area.

Material	National material range
Pressure treated	$2–$5/sq ft
Cedar	$3–$7/sq ft
Composite	$12–$22/sq ft

Pricing source and limitations

Angi — How Much Does It Cost to Build a Deck? (2026); national; reviewed 2026-08-27; medium confidence. National planning range only; local scope, access, products, labor, taxes, permits, and contractor pricing vary.

Plan responsibly

Before You Build

This project may be subject to local permit, zoning, site, or structural requirements.

Verify permit scopeConfirm local permits, drawings, and inspections.
Verify foundationsVerify soil, frost, drainage, loads, and site conditions.
Verify the assemblyConfirm ledger, foundations, guards, stairs, loads, materials, connectors, and local adoption.

Planning estimate: Use this range to plan and compare scope, then confirm pricing with local quotes.

No structural design: This does not design a ledger, foundation, guard, stair, connection, or load path.

View code references

Model-code reference

2012 OTHER, Section DCA 6

Prescriptive residential wood deck guidance: DCA 6 is model guidance, not proof of local adoption. This calculator does not apply its structural provisions.

Source: American Wood Council — DCA 6 Prescriptive Residential Wood Deck Construction Guide · Reviewed 2026-08-26

Local requirements may differ. A model-code reference does not confirm the code edition, amendments, zoning rules, or permit requirements adopted where the project is located.

Model-code references

2012 OTHER, Section DCA 6: Prescriptive residential wood deck guidance. Source: American Wood Council — DCA 6 Prescriptive Residential Wood Deck Construction Guide. Reviewed 2026-08-26.

Local requirements may differ. Verify the adopted code, amendments, zoning rules, and permit requirements with the local authority.

Methodology

How we calculate this

The calculator multiplies rectangular area plus entered waste by each material/labor square-foot rate, prices entered railing length separately, and adds the permit/design allowance. The stair area comes from the width multiplied by the horizontal run you enter, and only that area receives the stair square-foot rate. Stair count, framing, footings, and other structure still need project-specific design and pricing. An optional user-selected contingency percentage applies to the complete pre-contingency subtotal; it is not sourced pricing.

pre-contingency subtotal = area × (1 + waste) × material/labor rates + railing length × railing rates + entered stair add-on area × stair rates + permit/design allowance; total range = pre-contingency subtotal × (1 + contingency percentage)

Use comparable local inputs

Enter current rates with matching material, labor, tax, delivery, removal, access, and finish scope.

Design is outside this estimate

Verify structure, ledger, foundations, guards, stairs, loads, species, grade, connectors, local adoption, and permits separately.

Keep add-ons explicit

Use zero only when an item is genuinely outside scope; otherwise enter a transparent local range or allowance.

Worked examples

Deck Cost Calculator examples

12 ft by 10 ft worked example

The example produces 120 sq ft base area, 132 sq ft with waste, and a user-rate total of $3776–$5996.

Common questions

Deck Cost Calculator FAQ

Does this use national deck prices?

Homeowner mode starts with identified national planning ranges and shows their limitations. Advanced assumptions lets you replace every rate and allowance with values you enter.

Is the result a contractor quote?

No. It is transparent arithmetic and cannot inspect scope, site conditions, or price validity.

Does this design the deck?

No. A qualified local review must address framing, loads, foundations, ledgers, guards, stairs, connections, and permits.

Where is waste applied?

The entered waste percentage increases the area used for both square-foot material and labor rates; verify that scope matches your sources.

Sources

Assumptions and references

American Wood Council — DCA 6 Prescriptive Residential Wood Deck Construction Guide: Deck guidance covering structural framing, ledgers, footings, guards, and stairs; it is not proof of local adoption. Last checked 2026-08-26.

Last reviewed: 2026-08-26

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