The Deck
Materials — overwrite with your quotes
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Deck Cost Calculator Guide
Break a deck build into the parts that actually cost money, so you can see where the number comes from and which choices move it.
Every price here is a starting point you should overwrite, not a quote. Material and labour costs vary by region, by supplier and by month, and anything published today is stale by next quarter. Put your own quoted numbers in and the arithmetic will be right; leave the defaults and you will get a rough order of magnitude, nothing more.
Material Choice Is Most of the Spread
The same 320 sq ft deck swings enormously on decking alone. Pressure-treated pine, cedar, composite and hardwood can differ by 4–5× per square foot, and that single dropdown moves the total more than anything else on the page.
Composite costs more upfront and skips the staining. Pressure-treated costs least and wants re-sealing every couple of years, so the cheap option has a subscription attached.
The Framing Is Half the Deck and None of the Photos
Joists, beams, ledger, hangers, footings — invisible when it's finished, and roughly as expensive as the surface you walk on. People price a deck by looking at decking boards and are then surprised by the quote.
Footings are the part that varies most by geography. In a cold climate they must go below the frost line, which can mean 4ft holes and a very different number than a warm-climate build with 12in piers.
Railing Is Priced Per Foot and It Adds Up
Railing is quoted per linear foot, not per square foot of deck, so a long thin deck carries more railing than a square one of the same area.
Most codes require a railing once the deck sits more than about 30in above grade. That threshold is worth knowing before you design: a deck at 28in and a deck at 34in are different products at different prices, and the taller one also needs guards that meet a load requirement.
Labour Is Roughly Half — Set It to Zero at Your Own Risk
On a professionally built deck, labour is commonly comparable to materials. Setting labour to $0 gives you the DIY materials number, which is real — but a deck is structural. It's attached to your house, it holds people up, and a badly flashed ledger board is one of the more reliable ways to rot a wall from the inside.
If you build it yourself, the money you save is real and so is the permit inspection. Most jurisdictions require one.
What This Doesn't Include
Permits, demolition of an existing deck, site levelling, electrical, lighting, or a roof. Any of those can be a significant line of their own.
Related: decking calculator for board counts, deck stain calculator, framing calculator.
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