Use this free deck cost calculator to estimate the cost of building or replacing a residential deck in 2026. Enter the deck dimensions and select the material, deck height, railings, stairs and demolition options to create a preliminary project budget.
Deck Cost Calculator
Estimate deck size, professional installation, railings, stairs and demolition.
Estimated deck project cost
Preliminary professional-installation budget based on your selections.
This calculator provides a preliminary budgeting estimate rather than a contractor quote. Footings, structural engineering, drainage, permits, soil conditions and local building-code requirements can change the final cost.
How This Deck Cost Calculator Works
The calculator first multiplies deck length by width to determine square footage. It then applies the installed cost range associated with the selected deck type.
Material and site conditions adjust that base estimate. Railings, stairs and demolition are calculated separately because not every deck requires these components.
This structure makes the calculator useful for both simple ground-level decks and more complex elevated projects.
How Much Does It Cost to Build a Deck in 2026?
A new deck typically costs about $25 to $50 per square foot installed. HomeGuide estimates approximately $3,600 to $7,200 for a 12-by-12-foot deck and $10,000 to $20,000 for a 20-by-20-foot deck.
Angi reports that professional deck-building projects typically cost about $4,340 to $12,652 in 2026. Size, materials, deck height and design complexity are major cost factors.
Deck Cost by Size
| Deck size | Square feet | Typical installed cost |
|---|---|---|
| 10′ × 10′ | 100 | $2,500–$5,000 |
| 12′ × 12′ | 144 | $3,600–$7,200 |
| 12′ × 16′ | 192 | $4,800–$9,600 |
| 16′ × 16′ | 256 | $6,400–$12,800 |
| 20′ × 20′ | 400 | $10,000–$20,000 |
| 20′ × 24′ | 480 | $12,000–$24,000 |
These examples use the broad $25 to $50 per-square-foot range for a standard pressure-treated wood deck. Premium materials and elevated designs can cost substantially more.
Deck Cost by Type
| Deck type | Typical installed cost |
|---|---|
| Detached / floating | $20–$25 per sq. ft. |
| Ground-level / platform | $25–$30 per sq. ft. |
| Elevated | $30–$50 per sq. ft. |
| Second-story | $50–$60 per sq. ft. |
| Multi-level | $60–$100 per sq. ft. |
What Changes the Cost of Building a Deck?
Decking material
Pressure-treated lumber is typically among the lower-cost decking choices. Cedar and redwood generally cost more, while composite, PVC and tropical hardwood can move the project toward the premium end of the market.
Composite decking can also have different structural and installation costs depending on the product and deck design.
Deck height
Elevated decks require more structural support than simple ground-level platforms. Second-story and multi-level decks can require larger posts, reinforced foundations, railings, stairs and additional labor.
Railings
HomeGuide reports approximately $20 to $60 per linear foot installed for wood or vinyl deck railings. Aluminum and specialty railing systems can cost more.
Deck stairs
When stairs are incorporated into a new deck during construction, HomeGuide estimates they may add approximately $200 to $600 for a basic setup. Adding a new stair system to an existing deck typically costs about $1,400 to $2,600.
Site conditions
A level yard with good access generally costs less to work on than a steep site or backyard with restricted equipment access. Excavation, grading and difficult footings can increase labor and equipment costs.
How Much Does a 12×12 Deck Cost?
A 12-by-12-foot deck contains 144 square feet. HomeGuide estimates approximately $3,600 to $7,200 for a standard professionally installed deck of this size.
Elevated construction, premium decking, railings and stairs can increase the total.
How Much Does a 20×20 Deck Cost?
A 20-by-20-foot deck contains 400 square feet. At $25 to $50 per square foot, a standard installation costs approximately $10,000 to $20,000.
A second-story or multi-level 400-square-foot deck can cost significantly more because the structural requirements are different.
How Much Does Composite Decking Cost?
Composite deck pricing depends on deck size, product quality and structural design. HomeGuide reports approximately $30 to $50 per square foot for many ground-level composite decks, while elevated and multi-level composite projects can cost considerably more.
Angi reports approximately $5,400 to $11,500 for a standard composite deck installation in 2026.
How Much Does Deck Railing Cost?
Wood railing commonly costs about $20 to $50 per linear foot installed. HomeGuide reports approximately $25 to $60 per linear foot for composite railing and $50 to $200 for aluminum.
The total railing requirement depends on deck dimensions, stairs, openings and which deck edges require fall protection.
How Much Does Old Deck Removal Cost?
Removing an existing deck generally costs approximately $5 to $15 per square foot. A 200-square-foot deck could therefore add roughly $1,000 to $3,000 in demolition and disposal costs.
Elevated decks, difficult access and heavy structural components can increase demolition costs.
New Deck vs. Deck Replacement Cost
HomeGuide reports approximately $25 to $50 per square foot for new deck construction and about $30 to $55 per square foot for deck replacement.
Replacement is typically more expensive because the existing structure must be dismantled and hauled away before new construction begins.
What Is Included in This Estimate?
The base estimate represents typical professional deck construction according to the selected deck type. Material and site-condition selections adjust this baseline.
Railings, stairs and existing-deck demolition are calculated separately when selected so their effect on the budget remains visible.
What Is Not Automatically Included?
Major grading, tree removal, complex drainage systems, roofs, pergolas, outdoor kitchens, electrical systems, lighting, structural engineering and unusual foundation requirements are not automatically included.
Permit costs are also not automatically added because requirements vary substantially by jurisdiction and deck design.
Calculator Methodology
HomeFixLedger uses current U.S. professional deck-building cost ranges as the baseline. A detached or floating deck uses approximately $20 to $25 per square foot, ground-level construction $25 to $30, elevated decks $30 to $50, second-story decks $50 to $60 and multi-level decks $60 to $100.
Deck square footage is calculated directly from the length and width entered by the user. Material and site conditions then provide moderated adjustments to the base installed range.
Railings are calculated by linear foot rather than deck square footage. Stairs use separate project allowances, while existing-deck removal uses approximately $5 to $15 per square foot.
These separate calculations reduce the risk of applying an add-on to unrelated parts of the project.
Last reviewed: September 2026
Frequently Asked Questions
How much does a deck cost per square foot in 2026?
HomeGuide reports approximately $25 to $50 per square foot installed for a typical new deck. Elevated, second-story and multi-level decks can cost significantly more.
How do I calculate deck square footage?
For a rectangular deck, multiply the length by the width. A 16-foot-by-16-foot deck contains 256 square feet.
How much does a 16×16 deck cost?
A 16-by-16-foot deck contains 256 square feet. Using a standard $25 to $50 per-square-foot range, the project costs approximately $6,400 to $12,800 before premium features or unusual site conditions.
Does this calculator include railings?
Only when you select a railing material and enter the number of linear feet required. This prevents the calculator from assuming that every deck requires the same amount of railing.
Does deck height affect cost?
Yes. Elevated and second-story decks generally require more substantial footings, posts, structural framing and safety features than ground-level decks.