Material Total: $0.00
Labor Total: $0.00
Waste Allowance: 0%
Calculator Use
Planning a backyard renovation requires precision, and our decking cost calculator is designed to provide you with an accurate financial blueprint for your project. Whether you are building a small pressure-treated platform or a sprawling composite entertainment space, this tool helps you account for the primary cost drivers: dimensions, material quality, and professional labor rates.
To get the most accurate estimate, measure the intended footprint of your deck in feet. Enter the length and width into the calculator, followed by the current market price of your chosen material. If you are hiring a contractor, include their hourly or square-foot labor rate to see the total investment required.
- Deck Length & Width
- The linear dimensions of the deck surface. For multi-level decks, calculate each level separately and add the costs together.
- Material Cost per Sq Ft
- The price of the decking boards, joists, and hardware combined per square foot. Basic wood usually starts around $5-$10, while premium composites can exceed $30.
- Waste Percentage
- A buffer for off-cuts and mistakes. A standard 10% is recommended for simple rectangular decks, while 15-20% is better for diagonal patterns or curved edges.
How It Works
The decking cost calculator utilizes a standard construction estimation formula to derive its results. By breaking down the components, you can better understand where your money is going. The core formula used is:
Total Cost = [(Area × Material Price) × (1 + Waste%)] + (Area × Labor Price)
- Area: Calculated as Length multiplied by Width. This defines the square footage of the deck top.
- Waste Multiplier: Converts the percentage into a decimal (e.g., 10% becomes 1.10) to ensure you order enough extra lumber for end-cuts.
- Labor Burden: Calculated separately as labor rates are typically not subject to the material waste multiplier.
Calculation Example
Example: Suppose you want to build a 16ft by 20ft composite deck. You have selected a mid-range composite board at $18 per square foot, and a local contractor has quoted $25 per square foot for the installation.
Step-by-step solution:
- Calculate Area: 16 ft × 20 ft = 320 sq ft
- Calculate Raw Material Cost: 320 × $18 = $5,760
- Add 10% Waste: $5,760 × 1.10 = $6,336
- Calculate Labor Cost: 320 × $25 = $8,000
- Final Total: $6,336 + $8,000 = $14,336
Understanding Decking Materials
When using the decking cost calculator, the material price is the most variable factor. Here is a look at common options:
Pressure-Treated Wood
This is the most affordable option. It is chemically treated to resist rot and insects. However, it requires annual maintenance, including staining and sealing, to prevent warping and splintering. Expect to pay $5-$8 per square foot for materials.
Cedar and Redwood
Naturally resistant to decay, these woods offer a beautiful, high-end look. They are softer than treated lumber and require regular oiling to maintain their color. Material costs typically range from $10 to $15 per square foot.
Composite Decking
Made from a blend of wood fibers and plastic, composite decking is virtually maintenance-free. It does not rot or splinter and comes in various colors. While the initial cost is high ($15-$35 per square foot), the long-term savings on maintenance make it a popular choice.
Common Questions
Does the calculator include permit costs?
No, this calculator focuses on material and labor. Building permits vary significantly by municipality, often ranging from $100 to $500 depending on the project's scale. Always check with your local building department before starting.
How much can I save by doing it myself?
By removing the labor component in the decking cost calculator, you can see that labor often accounts for 50% to 60% of the total cost. However, remember that DIY projects require significant tool investments and time.
Should I calculate railings and stairs separately?
Yes. Standard square-foot pricing usually covers the deck platform. Railings can cost an additional $20 to $60 per linear foot, and stairs are often billed at a flat rate per riser. For a more conservative estimate, increase your material cost per square foot by 20% to account for these features.