Mercer Island, King County
A chimney cap on Mercer Island costs $235 to $845 installed. A simple stainless cap on a single round flue sits at the low end; a custom cap spanning several flues on a wide crown sits at the high end. Either way, it is one of the cheapest ways to keep rain, animals and debris out of a flue.
Typical investment
$235–$845
Book an inspection
Book your $99 inspection
$99 plus tax, deducted when you approve the repair
Not sure where to start
Pick what you're seeing at your Mercer Island home — we'll point you to the right fix.
What we do
The same crew, the same written quote — for Mercer Island homes.
Level 1 or Level 2 inspection, with a camera scan where warranted
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Complete sweep of the flue and firebox, protected by drop cloths and HEPA filtration
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Restoration of brick, mortar joints and firebox
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A stainless-steel or ceramic liner run the full height of the flue
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Cleaning of the burner, pilot and valve assembly
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Crown recast — or rebuilt outright where the damage demands it
Learn moreRanges shown for orientation — the exact figure is written up on-site, after the inspection.
Across the island, the chimney top is the part of the house that meets the most weather and gets the least attention. An uncapped flue collects rain every wet month, and a cap with a torn or clogged screen can be worse than none, because it stops the fire from drawing while still letting water in.
Every Mercer Island rooftop looks out over Lake Washington, which wraps the island and covers about 6.52 square miles of the city's total area. King County lists it as the state's second largest natural lake.
The Western Regional Climate Center says western Washington's strongest winds usually blow in from the south or southwest during late fall and winter. We fasten caps with that in mind, because a loose one ends up in the yard after the first big blow.
According to Oregon State's extension service, moss needs moisture and tree shade, and cutting back overhanging trees does more for a roof in the long run than any treatment. WSU Extension adds that moss grows through fall, winter and spring when a surface stays wet.
A cap under those same trees catches what falls. We check that the screen is still open, clear anything lodged in it, and suggest a design with a removable lid so the next sweep can clean it easily.
Every chimney cap installation we do in Mercer Island includes:
Smoke coming back into the room, or a smell that won't go? Book the inspection first.
Book nowMost of the cap jobs we see here are replacements rather than first installs. Galvanized caps rust through, mesh screens get packed with debris from overhanging trees, and older caps were often sized to one flue when the crown now carries two. We measure every flue on the crown before recommending a size.
Two or more strands of the Seattle fault run under Mercer Island, the city says, and FEMA describes masonry chimneys on wood-frame houses as extremely vulnerable to earthquake shaking.
Installing a cap puts us at the very top of the chimney, which is where shaking damage often shows first: a cracked crown, a flue tile lifted out of line, loose brick in the top courses. If we see any of it, you get photos and an honest note, not a cap bolted over a problem.
We measure each flue's outside dimensions and the crown's footprint, and check that the chimney is tall enough relative to the roof around it.
You choose between a single-flue cap and a crown-mount cap that covers several flues, with the price for each option set out in writing.
The cap is fastened so it stays put in a winter storm but can still be lifted off for sweeping, and any old fasteners or rusted parts are removed.
Where the fireplace can be tested, we confirm the new cap does not restrict the draft, then photograph the finished top.
A chimney cap sits first on CSIA's list of four inexpensive ways to keep water out of a masonry chimney, ahead of the crown, the flashing and a water repellent. CSIA also says water does more harm to these chimneys than fire.
The case for one here is simple: the regional climate record shows the rains settling in around October, and midwinter months that are wet on most days of the calendar. An open flue takes all of it.
What this work is quoted at for Mercer Island homes — the exact figure comes from the $99 on-site inspection, credited toward the work.
| Service | Price in Mercer Island | What that covers |
|---|---|---|
| Chimney Cap Installation | $235–$845 | Stainless cap fitted; multi-flue and custom at the top |
| Chimney Sweep | $189–$449 | Full flue swept, Level 1 inspection included |
| Chimney Inspection | $99 plus tax | Level 1 visual; Level 2 adds a full camera scan |
| Chimney Relining | From $1,895 | Full-length stainless liner, sized to the appliance |
| Chimney Repair | From $425 | Masonry repair — brick and mortar, scoped after diagnosis |
Ranges are what these jobs are quoted at in Mercer Island. The exact figure is set on site after a $99 inspection (credited toward the job if you go ahead), and you approve it before any work starts.
Mercer Island is an island city in the middle of Lake Washington, on Lake Washington, with mid-century and high-value waterfront homes.
Mercer IslandKing County, WA · 47.571, -122.222
Before and after
Illustrations of what each repair changes on a typical chimney — not photos of a specific job.
Before
After
Before
After
Before
After
Four steps, each one on paper — so you always know what happens next.
Choose a genuine opening on the crew's calendar. Confirmation is immediate.
Liner, crown, cap, flashing and masonry examined in order — each finding photographed.
One document, plain numbers, covering only the work your chimney genuinely needs.
The repair is completed, then handed over with before-and-after photos of every item.
$235 to $845 installed. Single round flues are at the bottom of the range; multi-flue and custom crown-mount caps are at the top.
Where a spark arrestor is used, the residential code calls for a net free area at least four times the flue outlet, corrosion-resistant screen, openings no larger than half an inch and a removable top so the flue can be cleaned.
It can. The code requires a chimney to stand at least 3 feet above where it passes through the roof and 2 feet above anything within 10 feet. A cap does not fix a short chimney, and we will say so if yours falls short.
A $99 on-site inspection, a written quote before any work, and photos of every item we touch.
