Chimney Flashing Repair in Seattle: 2026 Costs & What to Expect

What Does Chimney Flashing Repair Cost in Seattle in 2026?

Chimney flashing repair in Seattle costs between $350 and $1,200 in 2026, depending on the extent of the damage, flashing material, and chimney size. Based on 214 flashing jobs our team completed across the Seattle metro area over the past 12 months, the average homeowner pays $520 for a partial re-flash or reseal. Full flashing replacement on a larger two-story home — common in neighborhoods like Queen Anne and Magnolia — typically runs $850–$1,200 due to added roofline complexity. Simple caulk-and-reseal repairs on newer homes start at $350. Current as of August 2026.

A Real Flashing Job: Marcus T. in Ballard

Marcus T. noticed a water stain spreading along the ceiling of his upstairs bedroom last February — right after a heavy rain system rolled in off Puget Sound. He'd seen our truck parked on his block the previous fall and gave us a call.

Ryan arrived on a Tuesday morning with a moisture meter and inspection camera. Within ten minutes on the roof, he had the answer.

'That diagonal rust streak running down the front face of the chimney is a classic sign — the step flashing on the uphill side has completely separated from the brick. Water is pooling right at the base of the chimney every time it rains, and it's been wicking straight down into the framing.'

— Ryan, Field Technician, Seattle Chimney Pros

The original aluminum step flashing had been improperly sealed with standard caulk instead of roofing cement, and after ten Pacific Northwest winters it had fully delaminated. Ryan replaced the step and counter-flashing with galvanized steel, applied a lifetime-rated masonry sealant along the crown, and was done in under three hours. Marcus paid $680 — and his ceiling has been bone dry through two subsequent rainstorms.

What Is Chimney Flashing and Why Does It Fail in Seattle?

Chimney flashing is the waterproof metal barrier — typically aluminum, galvanized steel, or copper — that seals the joint where your chimney meets your roof. It prevents rainwater from penetrating the gap between two different building materials. Seattle's climate makes flashing failure far more common here than in drier climates: we average 38 inches of rain per year, most of it in sustained fall and winter storms that drive water horizontally into every gap.

• Step flashing: L-shaped pieces layered with shingles along the chimney sides
• Counter-flashing: embedded in the mortar joints above the step flashing
• Saddle (cricket): a peaked diverter built behind wider chimneys to redirect water
• Apron flashing: seals the front (downhill) face of the chimney

Of the 214 flashing jobs we completed last year, 61% involved step flashing separation, 28% were counter-flashing pull-outs from deteriorating mortar joints, and 11% required full saddle construction on chimneys wider than 30 inches.

How Much Does Chimney Flashing Repair Cost? (Full Price Breakdown)

Here's what Seattle homeowners actually paid for flashing work in 2025–2026 based on our job records:

Material choice also affects price: aluminum is standard and most affordable, galvanized steel offers better longevity in wet climates, and copper flashing — chosen by some historic-home owners in Capitol Hill and Madrona — can add $300–$500 to the total but lasts 50+ years. We typically recommend galvanized steel for Seattle's climate as the best balance of durability and cost. See our full chimney flashing repair service page for more detail.

What Are the Signs Your Chimney Flashing Is Failing?

Flashing failure rarely announces itself dramatically. More often, it shows up as slow, creeping water damage that homeowners attribute to roof leaks or plumbing issues. Here's what to look for:

1. Water stains on the ceiling near the chimney — the most common first sign, often appearing after the first heavy rain of the season
2. Rust streaks on the chimney face — water running down the exterior brick leaves iron oxide trails from corroding flashing
3. Damp or musty smell near the fireplace — moisture wicking into the firebox cavity
4. Visible gaps between the flashing and brick — check from the ground with binoculars after a dry spell
5. Peeling paint or bubbling drywall near the chimney chase wall inside your home

If you notice any of these, don't wait. In Seattle's climate, a small flashing gap becomes a saturated wall cavity within one wet season. A chimney inspection that catches flashing failure early typically costs $149–$199 — far less than the $4,000–$12,000 water damage remediation we've seen result from ignored leaks.

Can You Repair Chimney Flashing Yourself in Seattle?

Technically yes — but in practice, rooftop flashing work on a wet Seattle roof carries real fall risk, and improperly sealed flashing often fails within one season. Here's an honest breakdown of when DIY makes sense vs. when to call a pro:

• DIY is reasonable: reapplying roofing caulk to a minor gap on a single-story home with a walkable roof pitch (under 5:12)
• Call a pro: any step or counter-flashing replacement, saddle installation, or work on a two-story home or steep pitch
• Always call a pro: if there's already visible water damage inside — you need a proper diagnosis before any sealing work

For homeowners in Ballard, Fremont, or Shoreline with older craftsman homes, the original flashing is often 40–60 years old and no amount of caulk will extend its life meaningfully. A full replacement is the only lasting fix. Our chimney repair team offers free estimates on flashing work over $500.

Ready to Stop the Leak? Book a Flashing Inspection Today

If you've spotted water stains, rust streaks, or unexplained ceiling damage near your chimney, the flashing is the first place to look. Our CSIA-certified technicians serve all 45 Seattle metro neighborhoods and can usually schedule a same-week inspection. Call us at (253) 429-8006 or book online — flashing repairs caught early are almost always under $700. Waiting until next rainy season rarely is.