Why is my chimney leaking?

In St. Marys it is almost always the crown, the cap, or the flashing where the chimney meets the roof. We water-test to confirm before quoting a fix.

Can you fix it in winter?

Emergency sealing yes, permanent masonry work needs above-freezing temperatures. We will tell you honestly which one you are getting.

Is the repair guaranteed?

Completed waterproofing carries a written no-leak guarantee.

4.9★ from 743 GTA homeowners

Chimney Leak Repair Cost in St. Marys — Get Your Price Instantly

Leak tracing, flashing replacement and waterproofing with a dry guarantee. See real chimney leak repair prices in St.

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Typical chimney leak repair prices in St. Marys
Job type	Typical price
Cap and crown sealingStops the most common entry point	$420 – $780
Flashing replacementStep and counter-flashing renewed	$650 – $1,600
Full masonry waterproofingVapour-permeable sealer, 10-year rated	$780 – $1,900

Ranges reflect St. Marys labour and material costs. Your calculator result is tailored to your answers.

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Licensed, insured, WETT & TSSA certified · 4.9★ from 743 GTA reviews

What St. Marys homeowners say

Explained the pricing upfront
Quoted over the phone, confirmed on site before starting, and the final invoice matched exactly. Refreshing in this trade.

Simone R. · 2025-09-27

Camera scan caught a cracked tile
Previous company swept and said everything was fine. Diamond ran a camera and showed me a cracked liner tile on screen. Glad I got the second opinion.

Marta S. · 2025-11-30

Clean, quiet, respectful
Shoe covers, sheeting, and a sealed vacuum. My wife works from home and barely noticed they were here.

Peter N. · 2026-01-15

Wood stove cleaning done right
Careful, knowledgeable, and explained the creosote grading so I actually understood why it mattered. Booking was easy and they arrived inside the window.

Jonathan P. · 2026-01-27

Chimney Leak Repair pricing questions

Why is my chimney leaking?: In St. Marys it is almost always the crown, the cap, or the flashing where the chimney meets the roof. We water-test to confirm before quoting a fix.
Can you fix it in winter?: Emergency sealing yes, permanent masonry work needs above-freezing temperatures. We will tell you honestly which one you are getting.
Is the repair guaranteed?: Completed waterproofing carries a written no-leak guarantee.

Price another job

Chimney Cleaning in St. MarysFull sweep with camera inspection and a same-day photo report.Chimney Inspection in St. MarysLevel 1 or Level 2 camera inspection with a written, insurer-ready report.Chimney Repair in St. MarysCrown, cap, mortar, flashing and liner repairs quoted in writing.Chimney Rebuild in St. MarysPartial or full masonry rebuilds to code with matched brick.

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Call Diamond Home Services and we'll price your chimney leak repair over the phone.

(437) 475-2233

Chimney Leak Repair Cost in St. Marys — Get Your Price Instantly

What St. Marys homeowners say

Chimney Leak Repair pricing questions

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