Northgate, King County
Chimney waterproofing in Northgate is $320 to $795 per chimney. Size drives the price. A short Northgate stack on a single-story roof takes little product and little time, while a wide two-flue chimney rising past a second story takes far more. Repairs are not included, and when needed they come first. To know which case is yours, we begin by inspecting the stack for $99 plus tax, and that charge drops off the Northgate treatment bill when you say yes to it.
Typical investment
$320–$795
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 Northgate home — we'll point you to the right fix.
What we do
The same crew, the same written quote — for Northgate homes.
A Level 1 review of everything reachable, raised to a Level 2 camera scan when a question stays open
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The whole flue brushed, using heads picked for the liner's size and shape
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A photo assessment that distinguishes surface wear from structural damage
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Camera survey and measurements taken before any liner is chosen
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Measurement of each flue, or of the crown when a single cap will span several
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Glass removed, cleaned and checked for a sound gasket
Learn moreRanges shown for orientation — the exact figure is written up on-site, after the inspection.
The Sand Point station, in northeast Seattle, holds the closest long weather record to Northgate. From 1986 to 2016 it averaged 35.50 inches of precipitation a year, and its yearly totals swung from 28.42 inches in 2002 to 45.05 in 2006. July averaged 0.77 inch. A Northgate chimney therefore gets one reliably dry month, with a long wet season on either side of it.
Every chimney waterproofing we do in Northgate includes:
Smoke coming back into the room, or a smell that won't go? Book the inspection first.
Book nowUnprotected brick behaves like a sponge with a hard skin. It takes in rain through pores and hairline cracks, and on a mid-century Northgate chimney the mortar joints take in more than the brick does. Indoors the result shows up late: a brown ring on the ceiling, paint peeling on the chimney breast, rust on the damper. A repellent that lets vapor through stops the intake without sealing moisture in. How long it lasts depends on exposure. One local chimney company puts a treatment's life at five to ten years and advises a new coat every five to seven; on a Northgate stack we plan for the shorter interval.
Open joints, crown cracks and failed flashing are fixed before repellent is even considered. The product does not bridge gaps.
We book the job for a dry spell, so that the masonry is dry to depth and not just on its face.
Algae, moss and loose dirt are scrubbed off, and the stack is given time to dry again.
Repellent is flooded on in two passes, the second while the first is still wet, starting at the base of the stack.
Once it has cured we run a hose over each face and you watch the water sheet off.
What this work is quoted at for Northgate homes — the exact figure comes from the $99 on-site inspection, credited toward the work.
| Service | Price in Northgate | What that covers |
|---|---|---|
| Chimney Waterproofing | $320–$795 | Breathable sealer — reapplied every 3–5 years in this climate |
| Chimney Sweep | $209–$459 | 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 Northgate. 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.
Northgate is a district that grew around the shopping mall opened in 1950 and joined Seattle in 1954, with postwar houses and apartments, in a ZIP area whose median build year is 1974. We work every part of it — Haller Lake, Pinehurst, Licton Springs included.
NorthgateKing County, WA · 47.707, -122.327
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.
$320 to $795. The size of the chimney and the roof it stands on decide the figure. Repairs it may need are quoted apart.
No. The repellent dries clear and leaves no sheen. From the street nothing changes, except that the chimney stops darkening in the rain.
No. A framed chase with siding is protected by paint, caulk and its metal top cover, not by masonry repellent. We tell you which kind you have.
In the dry part of the year. Seattle's clearer season, on WeatherSpark's calendar, opens in mid-June and closes around October 8; Northgate treatments are booked inside it.
A $99 on-site inspection, a written quote before any work, and photos of every item we touch.
