What chimney cap means
A chimney cap is a metal cover over the top of the flue, with a hood to keep rain out and mesh to keep animals and sparks in check.
Where it matters on a chimney job
Caps are a quick, high value add on: animals in the flue and rain damage both trace back to a missing cap. Measure the flue tile carefully; a cap that does not fit gets blown off.
What the model code says
- Where a spark arrestor is installed, the screen or cap must be removable so the flue can be cleaned. (IRC 2021, Chapter 10)
Check which code edition your building department enforces for chimney cap before you quote.
What it costs
For chimney cap, the closest koira.ai price is the chimney cap replacement cost guide, near $360 for a typical job and $190 to $800 for most. The guide shows its sources and what moves the price.
Work it out
- Cost guide: Chimney cap replacement cost
- Tools, templates and guides: Free chimney resources
Sources: 2021 International Residential Code, Chapter 10, Chimneys and Fireplaces (ICC). Checked October 9, 2026.