If you have a factory-built (prefab) chimney, the top isn't a concrete crown — it's a metal chase cover, and it's usually the first thing to fail. The rust streaks running down the siding below a chimney are the tell-tale sign. A new chase cover is a straightforward job that stops leaks before they reach the framing inside the chase.
What chase cover replacement costs in Seattle
Price comes down to material. A galvanized or aluminum cover runs about $299–$700. A stainless steel or custom-fabricated cover — the one that won't rust again — runs $700–$1,500, depending on size and how custom the fit has to be. We measure and quote in writing;
Why chase covers rust out in Seattle
The original covers on most prefab chimneys are thin galvanized steel, and in our climate they rust through in a few years. Once the surface rusts, water pools instead of draining, the rust spreads, and it drips down onto the siding — those orange streaks. A flat or dished cover that holds water fails fastest. A properly sloped stainless cover sheds water and lasts.
Signs you need a new chase cover
- Rust stains streaking down the chase or siding.
- Standing water or rust visible on top of the cover.
- Water inside the chase or around the firebox after rain.
- A cover that's dished, dented, or pulling away at the edges.
Stainless is worth it here
Given how wet Seattle is, replacing a rusted galvanized cover with another galvanized cover just restarts the clock. A stainless cover costs a little more up front but is the last one you'll buy. Either way you get a free written quote, a free second opinion, and price-match plus 10–25% on comparable work.
What Chase Cover Replacement Costs in Seattle (2026)
Real 2026 ranges for the Seattle–Tacoma–Everett area, with a free written quote before any work begins.
| Aluminum / galvanized cover | $299–$700 |
| Stainless / custom cover | $700–$1,500 |
| Rust-proof, sloped to shed water | stainless |
Get a free quote
See our full chimney service pricing, or learn more about Chase Cover Replacement. You get a free written quote before any work begins — call 206-453-2045 or request your free quote online.