When an off-the-shelf cap won't fit your flue or you want something built to last, a custom cap is the answer. In the Puget Sound climate, a properly sized stainless or copper cap outlives a dozen cheap galvanized ones and stops the rain, birds, and moss that plague Seattle chimneys. Custom caps are fabricated to your exact flue dimensions, so they seal correctly and won't blow off in a windstorm. Here's what one costs and when it's worth it.
What a custom chimney cap costs in Seattle
A custom stainless steel cap, fabricated to your flue, runs about $700–$1,200. A copper cap or a multi-flue design covering more than one flue runs $1,200–$1,600. Size, number of flues, and roof access set the final figure. You get a free written quote first, and we price-match plus 10–25%.
Why custom instead of a stock cap
- Your flue is an odd size or shape a stock cap won't seal.
- You have multiple flues that one large cap can cover cleanly.
- You want stainless or copper that survives decades of Seattle rain.
- Wind on an exposed Puget Sound roofline keeps tearing off lighter caps.
- You want the look to match a heritage or custom home.
Why it pays off in our climate
Cheap galvanized caps rust through in a few wet Northwest winters, so you pay again and again. A custom stainless or copper cap resists the constant moisture, moss, and freeze-thaw across King, Pierce, and Snohomish counties. Built to your flue's exact size, it seals tight against wind-driven rain instead of leaving the gaps a loose stock cap leaves — the gaps that let water reach your liner and crown.
How to get an honest custom-cap quote
A fair quote starts with someone actually measuring your flue and checking the chimney's condition, not guessing from the ground. We give you a free written quote with the material and dimensions spelled out, offer a free second opinion if you've been quoted elsewhere, and back it with our price-match plus 10–25%. There are no surprise add-ons after the fact.
What Custom Chimney Cap Costs in Seattle (2026)
Real 2026 ranges for the Seattle–Tacoma–Everett area, with a free written quote before any work begins.
| Custom stainless cap | $700–$1,200 |
| Copper or multi-flue custom cap | $1,200–$1,600 |
Get a free quote
See our full chimney service pricing, or learn more about Custom Chimney Cap. You get a free written quote before any work begins — call 206-453-2045 or request your free quote online.