Redmond, King County
Waterproofing a chimney in Redmond costs between $285 and $790. Stack size and roof access explain the difference. The product is a breathable water repellent: rain beads on the brick face while vapor inside the masonry can still escape. It goes on only after the brick is clean and the cracks are closed, because sealing over a defect locks the problem in.
Typical investment
$285–$790
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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 Redmond home — we'll point you to the right fix.
What we do
The same crew, the same written quote — for Redmond homes.
A Level 1 check, or a Level 2 with a camera run through the flue when the visible parts are not enough
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Brushing of the whole flue, top to firebox, with brush heads sized to the liner
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A photographed assessment that separates cosmetic wear from structural damage
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A camera run and full measurements before any liner is ordered
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Measurement of each flue, or of the full crown for a multi-flue cap
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Cleaning and testing of the burner, the pilot assembly and the ignition
Learn moreRanges shown for orientation — the exact figure is written up on-site, after the inspection.
Redmond's rain is spread thin over many days. WeatherSpark's model gives the city better than a 35% chance of a wet day, every day, from October 9 until May 2, and calls December the cloudiest month, overcast or mostly cloudy around 74% of the time. Brick under that sky does not get a drying spell between showers, and porous masonry can stay damp for long stretches.
Education Hill joined Redmond in 1951, 332 acres that almost tripled the incorporated area. More than 40 further annexations followed during the 1950s and 1960s, the city's historic survey reports, and Census estimates date 23.4% of current housing units to the years 1960 through 1979.
Chimneys built in that stretch have absorbed and released rainwater for half a century or more. If an insert or liner was added along the way, the old brick shell around it now runs cooler, because less heat reaches it, and cooler masonry dries more slowly. That is the case where a repellent earns its price.
Every chimney waterproofing we do in Redmond includes:
Smoke coming back into the room, or a smell that won't go? Book the inspection first.
Book nowSummer humidity is not the issue here; WeatherSpark reports muggy conditions at about 0% all year. What harms a chimney is cool-season water that soaks in and then meets one of the nights below freezing that the city's hazard annex says Redmond does get. Wind adds to it: the same annex describes wind tunnels between the hills, and wind-driven rain reaches the vertical faces of a stack, not only its top.
FEMA ranks chimneys by condition: the unreinforced ones with degraded mortar come out worst in an earthquake. Redmond's annex names the hazards that make this more than theory, among them the Cascadia Subduction Zone and the liquefaction zone the city stands on.
A repellent adds no strength. Its contribution is indirect: mortar that stays dry degrades more slowly, so the chimney spends more of its life in the better condition. We say this plainly because waterproofing is sometimes sold as protection it cannot give.
Water sprayed on the brick tells us how fast it soaks in and whether an old coating is still working.
Any cracked joint, loose brick or broken crown is listed in the quote, since repellent cannot bridge a gap.
Moss, soot stains and mineral bloom are removed, then the masonry is given time to dry out.
The repellent is sprayed from the bottom of the stack upward until the brick stops taking it.
Photos and the product name go into your file, so the next application is scheduled from a known day.
What this work is quoted at for Redmond homes — the exact figure comes from the $99 on-site inspection, credited toward the work.
| Service | Price in Redmond | What that covers |
|---|---|---|
| Chimney Waterproofing | $285–$790 | Breathable sealer — reapplied every 3–5 years in this climate |
| 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 $1,900 | 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 Redmond. 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.
Spraying a repellent is maintenance. Redmond's mechanical permit application concerns installed fixtures, and a repellent is not a fixture. The code is still useful here, as a checklist of how a chimney is supposed to shed water in the first place.
The 2021 residential code in force in Redmond wants a masonry chimney topped by a sloped cap with a drip edge. Where that slab is flat, cracked or missing its overhang, water runs down the brick face no matter what is sprayed on it, and we recommend fixing the top before treating the sides.
Redmond is a city of a little over 17 square miles around the northern tip of Lake Sammamish, on the Sammamish River, with homes with a median build year of 1993, close to a quarter of them built in the 1960s and 1970s. We work every part of it — Education Hill, Grass Lawn, Idylwood, North Redmond, Overlake included.
RedmondKing County, WA · 47.674, -122.121
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.
$285 at the low end, $790 at the high end. A short stack on a walkable roof is near the first number; a tall or wide one on a steep roof is near the second.
Plan on renewing it every three to five years. The side of the chimney facing the south and southwest winter winds usually wears first.
Only in a dry spell long enough for the brick to dry before and the product to cure after. Redmond's clearer months, mid-June to early October in WeatherSpark's model, are the reliable time.
Always. That first look is our $99 plus tax evaluation. Accept the waterproofing quote and its total is lowered by the same $99.
A $99 on-site inspection, a written quote before any work, and photos of every item we touch.
