Guides

How Much Does It Cost to Build a Deck? 2026 Cost Guide by Size, Material and Labor

Updated October 26, 2026. 15 min read.

Building a new deck is a great way to create more usable outdoor space, whether you want somewhere to relax, entertain guests, enjoy family meals, or set up outdoor furniture. But before purchasing lumber or contacting a contractor, one important question needs answering: How much does it cost to build a deck?

In 2026, a professionally installed pressure-treated wood deck typically costs around $25 to $50 per square foot, while composite decking can cost approximately $40 to $80 per square foot, including installation. The actual price depends on the deck's size, height, materials, foundation, railings, stairs, and local labor rates.

For example, a basic 10×10-foot pressure-treated deck could cost approximately $2,500 to $5,000, while a similarly sized composite deck could cost $4,000 to $8,000.

These are national planning estimates, not contractor quotes. A small ground-level platform may cost less, while an elevated or custom-designed deck can cost considerably more.

In this guide, we'll break down deck building costs by size and material, explain what affects installation prices, compare wood and composite decking, and show you how to estimate the materials needed for your project.

How Much Does It Cost to Build a Deck Per Square Foot?

The average cost to build a deck depends heavily on the decking material and the complexity of the structure.

According to 2026 cost estimates from HomeGuide, a new pressure-treated pine deck generally costs $25 to $50 per square foot installed. Composite decking typically costs $40 to $80 per square foot installed.

Here is a comparison of common decking materials:

These prices represent complete new deck system estimates, including the supporting joist structure, rather than simply the price of the visible deck boards.

Material prices, labor, and project requirements vary by region. Elevated decks, complicated layouts, premium finishes, and additional features can push the total above these ranges.

For an additional national reference, Angi reported an average deck-building cost of $8,322 in September 2026, with most reported projects falling between $4,339 and $12,654.

Deck Cost by Size: 10×10, 12×12, 12×16 and More

The size of your deck is one of the biggest factors determining the overall construction budget.

A larger deck requires more decking boards, joists, framing lumber, fasteners, and supporting materials. It also takes more time to construct.

Below are estimated installation costs for several popular deck sizes, using the published pressure-treated wood and composite price ranges.

These are approximate planning ranges based on published installed costs. Actual project prices depend on the deck design, location, height, and included features.

How much does a 10×10 deck cost?

A 10×10 deck has 100 square feet of surface area.

A pressure-treated wood deck of this size might cost $2,500 to $5,000 professionally installed. A composite version could cost approximately $4,000 to $8,000.

This size works well for a small seating area, a few outdoor chairs, or a compact space outside a back door.

How much does a 12×12 deck cost?

A 12×12 deck provides 144 square feet of outdoor space.

A pressure-treated deck could cost approximately $3,600 to $7,200, while composite decking might cost $5,750 to $11,500.

This size gives homeowners additional room for a small dining table, chairs, and outdoor furniture.

How much does a 12×16 deck cost?

A 12×16 deck has 192 square feet of space and is a popular layout for a medium-sized backyard deck.

Expect a planning budget of approximately $4,800 to $9,600 for pressure-treated wood or $7,680 to $15,350 for composite decking.

A deck this size can accommodate a dining area and additional seating, making it more practical for entertaining.

How much does a 20×20 deck cost?

A 20×20 deck provides 400 square feet of space.

A pressure-treated wood deck could cost $10,000 to $20,000, while a composite deck could cost $16,000 to $32,000.

Larger projects may require additional footings, stronger framing, railings, and stairs. The final price can increase significantly when the deck is elevated or has multiple levels.

Wood vs. Composite Decking: Which Is Cheaper?

One of the biggest decisions when planning a new deck is choosing between traditional wood and composite decking.

Both materials have advantages, but their upfront costs and maintenance requirements are different.

Pressure-treated wood decking

Pressure-treated lumber is one of the most affordable options for building a deck.

The wood is treated to help protect it against moisture, rot, and insects. It is widely available and can be cut and installed using conventional woodworking tools.

Advantages include:

• Lower initial construction cost.
• Widely available at home improvement stores.
• Easy to cut, modify, and repair.
• Can be stained or painted to change its appearance.

However, pressure-treated wood requires ongoing maintenance. Depending on the product and weather exposure, homeowners may need to clean, stain, or seal the deck periodically.

Wood can also develop splinters, cracks, fading, or warping over time if it is not properly maintained.

Composite decking

Composite decking is manufactured using a combination of wood fibers and synthetic materials, although specific compositions vary by manufacturer.

Brands such as Trex offer composite decking designed to provide the appearance of wood with less maintenance.

Advantages include:

• Less routine maintenance than traditional wood.
• No regular staining or sealing requirement.
• Resistance to many common moisture-related problems.
• Multiple colors, patterns, and finishes.
• No typical wood splinters.

The biggest disadvantage is the higher initial installation cost.

Composite decking also requires appropriate cleaning and inspection, and its supporting structure still needs to be properly designed and maintained.

Is composite decking worth the extra cost?

It depends on how long you plan to keep the deck and how much maintenance you are willing to perform.

For someone building a budget-friendly backyard deck, pressure-treated lumber may make more sense.

For a homeowner planning to use the deck for many years who would rather spend less time maintaining the surface, composite decking may justify its higher initial price.

Before making a decision, compare the full project cost rather than looking only at the price of individual deck boards.

For a more detailed comparison, see our guide: Deck Joist Spacing and Composite vs Wood Decking Explained.

What Is Included in the Cost of Building a Deck?

A common budgeting mistake is calculating the price of the visible decking boards without accounting for the rest of the structure.

A complete deck requires several materials and construction steps.

Here are the major items to consider.

1. Decking boards

Decking boards create the walking surface.

The total number required depends on the deck's length, width, board width, board length, and spacing between boards.

Pressure-treated lumber is generally cheaper than composite boards, but the exact price depends on the product and retailer.

Remember to include additional boards for cuts, mistakes, and future repairs.

2. Joists and framing lumber

Joists support the decking boards and distribute the weight across the underlying structure.

Joist spacing affects how many joists are necessary. Sixteen inches on center is a common arrangement for many wood deck applications, but the correct spacing depends on the decking material, board direction, span, and manufacturer requirements.

Additional framing materials may include beams, rim joists, blocking, and ledger boards.

3. Posts and footings

Deck posts and footings transfer the structure's weight to the ground.

The number, dimensions, depth, and spacing of these supports depend on the deck's design, soil conditions, loads, and local building requirements.

Elevated decks generally require more substantial structural support than simple low platforms.

4. Railings and stairs

Railings and stairs can add considerably to the total cost of building a deck.

A small ground-level deck may not require the same railing or stair arrangement as an elevated deck. Taller structures can require additional safety features, stronger connections, and more complicated framing.

Always check applicable local building codes before finalizing a design.

5. Fasteners and hardware

Deck screws, structural fasteners, joist hangers, post bases, brackets, anchors, and other hardware are easy to overlook.

Using the correct exterior-rated hardware is particularly important because decks are exposed to rain, humidity, and changing temperatures.

6. Finishing and additional materials

Depending on the project, homeowners may also need:

• Wood stain or sealant.
• Fascia boards.
• Flashing.
• Gravel or other base materials.
• Skirting and privacy panels.
• Built-in benches.
• Outdoor lighting.

These additions should be included in the budget before construction begins.

What Factors Affect the Cost of Building a Deck?

Two decks with exactly the same square footage can have very different installation prices.

Here are some of the reasons.

Deck height

A ground-level deck is generally simpler to construct than a second-story deck.

Elevated decks require additional structural planning, support posts, footings, railings, and often stairs. They may also require more labor and specialized construction equipment.

Ground conditions

A flat and accessible backyard generally makes construction easier.

Sloped ground, uneven soil, trees, rocks, and limited access can increase site preparation and labor costs.

A contractor may need to perform additional grading, excavation, or foundation work before construction begins.

Deck design

A simple rectangular deck is usually less complicated to build than one with curved edges, multiple levels, diagonal board patterns, or unusual dimensions.

Complex designs often require additional cutting, framing, hardware, and labor.

Local labor costs

Deck installation labor varies depending on where you live.

Contractors in expensive metropolitan areas may charge more than builders in less expensive regions.

The availability of construction materials and seasonal demand can also affect quotes.

Permits and inspections

Some deck projects require building permits and inspections.

Permit requirements depend on the deck's size, height, attachment to the home, and local regulations.

Angi reported typical deck permit costs of approximately $230 to $500 in its 2026 research, although actual municipal fees can differ. Check with your local building department before beginning construction.

Removing an existing deck

Replacing an old deck is not always the same as building a new one.

The contractor may need to remove old decking, dismantle framing, haul away debris, and inspect the existing support structure.

HomeGuide estimates deck replacement at approximately $30 to $55 per square foot installed, depending on the project.

Is It Cheaper to Build a Deck Yourself?

Building a deck yourself can reduce labor expenses, but it does not eliminate the cost of construction materials.

For a DIY deck, you still need to budget for:

• Decking boards.
• Joists and framing lumber.
• Posts and footings.
• Screws and structural hardware.
• Tools and equipment.
• Delivery and material transportation.
• Permits and inspections where required.

For example, HomeGuide estimates pressure-treated pine materials at approximately $14 to $28 per square foot, with professional labor estimated separately at around $11 to $22 per square foot.

These are reference ranges, not a guaranteed DIY project price. Your actual material bill depends on what is included in your design and what tools you already own.

A DIY deck may be a reasonable option for someone with construction experience who understands structural requirements.

However, elevated decks, complex foundations, attached decks, and structures supporting significant loads deserve particular attention. Mistakes involving footings, ledger connections, or framing can create serious safety problems.

When comparing DIY and professional deck construction, consider the value of your time, equipment costs, required inspections, and the consequences of mistakes.

How to Calculate the Materials Needed for a Deck

Before estimating the cost of a new deck, you need to determine how much material the project requires.

Start by measuring the planned deck.

For a rectangular deck:

Deck area = Length × Width

For example, a deck measuring 12 feet long and 16 feet wide has:

12 × 16 = 192 square feet.

Next, determine the decking board dimensions and the spacing required for the joists.

The quantity of decking boards depends on their width, length, spacing, layout, and the total deck area. Joist quantities depend on the span, spacing, and structural design.

A waste allowance is also helpful because boards must be cut to fit the deck's dimensions.

Rather than working everything out manually, use our free Deck Cost Calculator.

Enter your deck's length and width, joist spacing, board dimensions, and waste allowance to estimate the decking boards and joists required. You can also enter your local prices to estimate those materials' cost.

For more information about spacing and board selection, read our Deck Joist Spacing and Composite vs Wood Decking Explained.

If you need help measuring the project area, our guide on How to Calculate Square Footage of a Room, Yard or Irregular Shape explains the measurements and formulas.

How to Save Money When Building a Deck

You do not necessarily need an expensive design to create a useful outdoor space.

Here are some practical ways to keep your deck construction costs under control.

1. Keep the design simple.

Rectangular layouts generally require less complicated framing and cutting than custom shapes or multiple-level designs.

2. Choose materials based on your budget.

Pressure-treated lumber is a good starting point for homeowners who want a lower initial cost. Composite is worth comparing when reduced maintenance is a priority.

3. Measure before purchasing materials.

Ordering too little can cause delays, while buying substantially more than necessary wastes money. Calculate your deck area and material requirements before visiting a supplier.

4. Compare multiple contractor quotes.

Get several written estimates and compare what each contractor includes. A cheaper quote may exclude footings, railings, stairs, demolition, or other necessary work.

5. Avoid unnecessary upgrades.

Built-in seating, custom lighting, decorative railings, and multiple levels can improve the appearance of a deck, but they also increase the budget.

6. Plan for future maintenance.

The cheapest deck to build is not necessarily the cheapest to own. Consider the ongoing maintenance requirements of the material before making your final decision.

Frequently Asked Questions About Deck Building Costs

How much does it cost to build a 10×10 deck?

A professionally installed 10×10 pressure-treated wood deck may cost approximately $2,500 to $5,000. A composite deck of the same size may cost $4,000 to $8,000. Height, design, and additional features can change the final price.

How much does it cost to build a 12×16 deck?

A 12×16 deck has 192 square feet of surface area. A pressure-treated wood deck may cost approximately $4,800 to $9,600, while a composite version may cost $7,680 to $15,350.

How much does a deck cost per square foot?

A pressure-treated wood deck generally costs around $25 to $50 per square foot installed. Composite decking can cost approximately $40 to $80 per square foot installed. These are national planning estimates, and actual prices depend on the project.

Is a wood deck cheaper than a composite deck?

Yes. Pressure-treated wood usually costs less to install initially than composite decking. However, wood requires more regular maintenance, while composite generally requires less upkeep. The right choice depends on your budget and long-term preferences.

What is the cheapest type of decking material?

Pressure-treated pine is generally one of the most affordable options for a new deck. It is widely available, relatively inexpensive, and suitable for many residential applications when properly designed and maintained.

Does building a deck increase home value?

A deck can improve a home's usable outdoor space and appeal to potential buyers. However, the actual effect on resale value depends on the location, deck condition, design, materials, and local housing market. Do not assume the entire construction cost will be recovered when selling.

How much does it cost to replace an existing deck?

Replacing an existing deck may cost more than building a new one because the old structure must be removed and disposed of. HomeGuide's 2026 estimate is approximately $30 to $55 per square foot installed, although the final amount depends on demolition requirements and the replacement design.

Do I need a permit to build a backyard deck?

Possibly. Permit requirements vary by municipality and depend on factors such as the deck's dimensions, height, and whether it is attached to the house. Contact your local building department before starting construction.

How long does it take to build a deck?

A small, straightforward deck may take several days to construct, while larger or elevated decks can take considerably longer. Weather, site preparation, inspections, material availability, and design complexity all affect the schedule.

Final Thoughts

The cost to build a deck depends on much more than its square footage. Your choice of decking material, the supporting structure, labor, stairs, railings, and ground conditions all contribute to the final price.

For homeowners working with a limited budget, pressure-treated wood can be a practical starting point. Composite decking costs more initially but can reduce ongoing maintenance.

Before purchasing materials or hiring a contractor, measure your planned deck, calculate the quantities you need, and compare complete project estimates.

Ready to plan your project? Use our free Deck Cost Calculator to estimate the decking boards and joists required for your deck and calculate their material cost using your own prices.

Sources and Cost References

• HomeGuide – How Much Does It Cost to Build a Deck? (2026)
• HomeGuide – How Much Does Composite Decking Cost? (2026)
• Angi – How Much Does It Cost to Build a Deck? (2026)

Prices are estimates for planning purposes and are not guaranteed contractor quotes. Actual project costs vary by location, materials, construction requirements, and time of purchase.

More guides

• How Much Topsoil Do I Need? Coverage Chart & Bag GuideLearn how to calculate topsoil in cubic yards, compare bag counts, choose suitable depths, and estimate coverage for lawns and garden beds.
• Concrete Slab Thickness Guide: How Thick Should Your Slab Be?How thick to pour a concrete slab for a patio, walkway, shed, driveway or garage, plus base, reinforcement, joints and curing basics.
• Deck Joist Spacing and Composite vs Wood Decking ExplainedHow far apart to space deck joists, how that changes the number of joists you need, and how wood and composite decking compare.
• Fence Post Depth and Spacing: How Deep and How Far ApartHow deep to set fence posts, how far apart to space them, how much concrete to use, and what to check before you dig.