Deck Cost Calculator
Total a deck's cost from the prices in your own quotes, and count the decking boards and joists its size needs. The page supplies no prices: none are published by an official source, and they vary by region and supplier.
Reviewed & updated for 2026 by Rakesh Choudhary, PhDMethodology & sources · How we calculate
Deck cost components broken down
A "cost per square foot" headline bundles several separate costs. Ask each builder to itemize so you can compare like with like: decking boards; framing lumber, hangers and fasteners; footings and concrete; hidden fasteners and trim; the railing or guard system, usually priced per linear foot of edge; stairs; and labor.
Items that push a quote up: guards, which codes require on raised decks; long stair runs to a lower grade; elevated decks that need taller footings and heavier framing; curved or multi-level designs; removal of an old deck; and wiring for lights or outlets.
For materials, the calculator counts the decking and joists. On a 16 × 12 ft deck (192 sq ft) with boards running the 16 ft length, boards 5.5" wide (a nominal 6-inch board dressed dry, per the USDA Wood Handbook) with a 0.25" gap take 26 courses, or 416 linear feet of board, and joists at 16" on center take 13. The gap and joist spacing are typical figures, not official ones: the decking maker's instructions and your local code set them.
Comparing materials over the deck's life
Sticker price tells only half the story. To compare two materials, add for each: the installed price, the yearly cleaning and sealing cost multiplied by the years you expect to keep the deck, and any board replacement you expect in that time. Take the installed prices from quotes, the upkeep from the maker's care instructions and the product warranty for how long it is covered.
Wood decking generally needs regular sealing or staining; composite and PVC mostly need cleaning. Which comes out cheaper over time depends on the prices you are quoted and how long you stay.
Where homeowners blow the budget
- Underestimating railing length: A simple rectangle is straightforward; an L-shape or wrap-around has far more edge to rail, and railing is usually priced per linear foot.
- Choosing premium accessories late: Hidden fasteners, picture-frame border, integrated lighting, contrasting top rail caps: each is a small upgrade, but several together add up. Decide before the quote.
- Skipping the contractor permit pull: Some contractors offer to skip permits to save the homeowner the fee. Unpermitted decks can cause trouble at a home sale and can trigger forced removal. Always permit.
- Underestimating site prep: Sloped sites need taller footings or stepped construction. Rocky soil makes augering expensive. Tree root systems can force redesign. Get the contractor to inspect before locking in price.
- Adding electrical / gas as an afterthought: Running power for outlets, lights, or a gas line for a grill is far cheaper to do during construction than after. If you might want any of these, run the conduit/lines now.
- Forgetting the stairs: A deck 4 feet off grade needs 7 risers of about 6.9" and 6 treads, which at 11" each is 66" (5.5 ft) of horizontal run (see the stair calculator). Stairs are usually priced separately from the deck itself.
FAQs
How much does a deck cost?
No government source publishes deck prices, and quotes swing with region, material, height, railings and access, so this calculator starts empty. Ask two or three builders for an installed price per square foot, or for a lump sum you can divide by the area, and type the lowest and highest into the calculator to see the range for your size.
Is a deck worth the cost?
It depends on how much you will use it and what buyers in your area expect. Resale figures you see quoted come from industry surveys, not official data, and vary by market. Treat the deck as something you are buying to use, and ask a local agent if resale is the main reason.
How long does a deck last?
The decking material, the framing, how well water drains off and how often it is cleaned and sealed all matter. The decking maker's warranty states what it covers, and the frame underneath usually decides when a deck has to be rebuilt.
Permits required for a deck?
Usually, for a deck attached to the house or raised off the ground; the thresholds are set by your city or county, which adopt a model code with their own amendments. Call the building department before you buy materials, and ask about HOA approval too. Unpermitted work can surface at a home sale.
DIY vs hire a contractor?
Doing it yourself saves the labor share of a quote but needs framing, leveling, footings and railing skills, plus time. A contractor brings a warranty, handles the permit and inspections, and finishes faster. Low, freestanding decks are the easiest to take on yourself.