What baluster means
Balusters are the vertical posts between a handrail or guard rail and the stair or floor, filling the open space.
Also called spindle.
Where it matters on a carpentry job
Baluster spacing is checked with a ball at inspection. On stair remodels, count balusters per tread, and order a few extra for breakage.
What the model code says
- Required guards may not have openings that let a 4 inch sphere pass through. (IRC 2021, Chapter 3)
Check which code edition your building department enforces for baluster before you quote.
What it costs
For baluster, the closest koira.ai price is the staircase remodel cost guide, near $2,800 for a typical job and $1,500 to $4,100 for most. The guide shows its sources and what moves the price.
Work it out
- Cost guide: Staircase remodel cost
- Tools, templates and guides: Free carpentry resources
Sources: 2021 International Residential Code, Chapter 3, Building Planning (ICC). Checked October 9, 2026.