What deck post means
Deck posts are the vertical supports that carry the beams down to the footings.
Where it matters on a deck job
Posts need a real connection at both ends: to the footing and to the beam. A post just sitting on a block or toe nailed under a beam fails inspection. Price the post bases and caps with the posts.
What the model code says
- Where posts and beam construction support floor framing, positive connections are provided against uplift and lateral displacement. (IRC 2021, Chapter 5)
Check which code edition your building department enforces for deck post before you quote.
What it costs
Koira's deck building cost guide puts a typical job at $11,000, with most between $6,650 to $16,500. The guide shows its sources and what moves the price. The deck cost calculator prices a job line by line.
Work it out
- Free calculator: Deck cost calculator
- Cost guide: Deck building cost
- Tools, templates and guides: Free deck resources
Sources: 2021 International Residential Code, Chapter 5, Floors (ICC). Checked October 9, 2026.