How to Use This Calculator
Work through the fields from top to bottom, filling in what you know about your planned deck project. Even rough estimates will get you a useful cost range.
- Deck Length and Width: Enter the outer dimensions of the deck you want to build. If you have an L-shaped or multi-level design in mind, enter the dimensions of the largest section and select the appropriate shape option below.
- Decking Material: Choose the surface material that will cover your deck. Pressure-treated wood is the most affordable option, while composite and exotic hardwoods sit at the higher end. Your material choice has the biggest impact on overall cost.
- Deck Elevation and Shape: A ground-level deck is the simplest and least expensive to build. Taller decks require more structural work and drive up labor costs. Curved or multi-level decks also add to the total due to additional cutting and framing.
- Railing Type and Stairs: Select whether your deck will need a railing and what type. Railings are often required by code for elevated decks. Add stair sections if your deck will need steps to reach the yard or lower level.
- Region and Labor: Regional labor rates vary significantly across the country. Choose your region for a more accurate estimate. If you plan to do the work yourself, select DIY to see materials-only costs.
- Add-Ons and Extras: Check any features you want to include, such as built-in seating, a pergola, lighting, or removal of an old deck. Each add-on updates the estimate automatically.
Click "Calculate Cost" to see your low, mid, and high estimates. Use these numbers as a starting point when gathering quotes from local deck contractors.
What Is a Deck and When Do You Need One?
A deck is an outdoor platform attached to the back or side of a home, typically built from wood or composite materials and supported by a post-and-beam frame. Decks extend your living space outdoors, giving you a dedicated area for entertaining, relaxing, grilling, or simply enjoying your backyard without stepping onto the grass.
Homeowners consider building a new deck for several common reasons. You may be adding outdoor living space to a home that has none, replacing a rotted or structurally unsafe existing deck, or upgrading an older pressure-treated deck to a low-maintenance composite surface. Some homeowners build a deck as part of a larger backyard renovation alongside a pool, garden, or pergola. In every case, a professionally built deck typically adds value to a home and improves daily enjoyment of the property.
Decks range from simple ground-level platforms to elaborate multi-level structures with stairs, built-in seating, lighting, and shade structures. The right choice depends on your home's layout, your yard's slope, your local building codes, and your budget.
Average Deck Building Costs
Deck costs vary widely based on size, materials, complexity, and where you live. The table below shows typical low, mid, and high cost ranges for common deck sizes and configurations. These are installed costs that include both materials and professional labor.
| Deck Type / Scope | Low Estimate | Mid Estimate | High Estimate |
|---|---|---|---|
| Small Deck (100–150 sq ft), Pressure-Treated Wood | $3,500 | $5,500 | $8,000 |
| Medium Deck (200–300 sq ft), Pressure-Treated Wood | $7,000 | $11,000 | $16,000 |
| Medium Deck (200–300 sq ft), Mid-Grade Composite | $10,000 | $16,000 | $22,000 |
| Large Deck (400–600 sq ft), Pressure-Treated Wood | $14,000 | $22,000 | $32,000 |
| Large Deck (400–600 sq ft), Premium Composite or Hardwood | $22,000 | $36,000 | $55,000 |
| Multi-Level or Elevated Deck with Stairs and Railing | $18,000 | $30,000 | $50,000+ |
| DIY Deck (Materials Only, 200 sq ft, Pressure-Treated) | $2,000 | $3,500 | $5,500 |
These are national averages. Costs in high-cost-of-living areas like the Northeast or Pacific Coast can run 20–40% higher. Costs in the South and Midwest tend to fall toward the lower end of these ranges.
Frequently Asked Questions
How much does it cost to build a deck per square foot?
Most professionally built decks cost between $25 and $60 per square foot for pressure-treated wood, and $45 to $100 per square foot for composite or premium materials. These figures include both materials and labor. Very small decks or those with complex features like multiple levels, cable railings, or custom shapes can push costs higher.
Is composite decking worth the extra cost?
For many homeowners, yes. Composite decking costs more upfront than pressure-treated wood, typically 50 to 100 percent more per square foot, but it requires almost no maintenance. You will not need to sand, stain, or seal it every year. Over a 10 to 15 year period, the lower maintenance costs can make composite a better financial decision, especially if your time has value.
Do I need a permit to build a deck?
Most municipalities require a building permit for any deck that is attached to the house, elevated more than a foot or two off the ground, or larger than a certain square footage (often 200 sq ft). Your contractor will typically handle the permit process. Skipping a permit can create problems when you sell your home, so it is always best to check with your local building department first.
How long does it take to build a deck?
A straightforward deck build on a simple rectangular design typically takes a crew 3 to 7 days once materials are on site. Larger decks, multi-level designs, or projects with custom features can take 2 to 4 weeks. Permit approval timelines vary by location and can add days or weeks to the overall project schedule before work even begins.
Can I build a deck myself to save money?
Yes, and it can reduce costs by 40 to 60 percent compared to hiring a full crew. However, deck building requires solid carpentry skills, the right tools, and a thorough understanding of local building codes, particularly for footings and structural framing. An improperly built deck can be dangerous. If you are not experienced with structural projects, hiring a contractor for at least the framing portion is a wise middle ground.
How much does a deck increase home value?
According to real estate research, a new deck typically returns between 60 and 80 percent of its cost at resale, depending on the material, market, and quality of construction. In markets where outdoor living is highly valued, such as warmer climates or areas with larger lot sizes, the return can be even higher. A well-built deck is generally viewed as a positive selling point by buyers.
What is the most affordable decking material?
Pressure-treated lumber is the most affordable decking material available. It typically costs $2 to $5 per linear foot for the boards and holds up well when properly maintained. Cedar and redwood are more expensive but resist moisture and insects naturally. If budget is your primary concern and you are willing to perform annual maintenance, pressure-treated wood is the go-to choice.
How do I find a reliable deck contractor?
Start by asking neighbors or friends for referrals, then check contractor reviews on Google, Houzz, or the Better Business Bureau. Always ask for proof of license and insurance before signing anything, and get at least three written quotes. A reputable contractor will provide a detailed scope of work, material specifications, timeline, and payment schedule. Be cautious of quotes that seem unusually low, as they often signal cut corners or missing scope items.