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🍁 Built for Canadian homes — written to Canadian codes and provincial rules. Not intended for use outside Canada.
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Gutters overflow or spill during rain

Overflowing gutters are annoying and worth fixing, but the cause is usually simple — most often they're just packed with leaves and debris.

tuneWhat are you noticing?
Select anything that matches and the checklist below reorders to fit. Not sure? Skip it.
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Start here

In Canada, start by looking up at the gutters from the ground during or right after a heavy rain. Overflowing along most of the length, with visible leaves, twigs, or a trough sagging under packed debris, points here — the most common cause by far. Clearing them out from a stable ladder on firm ground usually fixes it; if the height or pitch of your roof makes that unsafe, this is an easy job to hire out.

Ranked from real-world failure data. The order updates as you select what you’re noticing above.

Likely causes, in the order to check them

Showing the typical order
Beginner-friendly Doable, with care Safety-critical Call a pro

visibilityHow to check

warning Do the free ground check first, then mind the ladderYou can rule this in for free from the ground — do that before climbing anything. If you do go up, ladder falls are one of the most common serious home-repair injuries in Canada: set the ladder on firm, level ground at the right angle, keep your hips between the rails, never overreach, and don't work in wind or on a wet, steep roofline. If reaching the gutter safely isn't straightforward, this is a cheap, fast job to hire out.
  1. From the ground during or right after a hard rain, watch where the water spills: overflow along most of the run, with visible debris or a sagging trough, points to a clog. This look costs nothing and rules the cause in or out.
  2. If you can do so safely, set a stable ladder on firm, level ground and look into the trough — packed leaves, granules, or standing water that won't drain confirms it.
  3. Check that water actually reaches the downspout outlet. If the trough is clear but water still backs up at the outlet, the downspout (not the gutter) is the blockage — switch to that cause.
buildNo tools schedule15 min

handymanHow to fix it

report Ladder safety before you startNearly all gutter-cleaning injuries are falls. Use a stable ladder on firm, level ground, keep three points of contact, keep your body centred between the rails, and move the ladder rather than overreaching. Don't do it alone, in wind, or on ice, and don't step onto a steep or wet roof. If the height or footing isn't safe, hire it out — it's inexpensive and routine for a pro.

Working from a stable ladder on firm ground, scoop the debris out of the trough by hand, flush it toward the downspout with a hose, and confirm water runs freely out the bottom before moving the ladder along.

  1. Set a stable ladder on firm, level ground and move it along as you go — never lean out to reach the next section. Wear gloves; wet debris and cut edges are sharp.
  2. Scoop leaves and grit out of the trough by hand or with a small gutter scoop into a bucket, working from the far end toward the downspout.
  3. Flush the trough with a hose toward the downspout and confirm water runs freely out the bottom. Slow drainage there means the downspout is also blocked.
  4. Re-check the pitch by eye — if water pools mid-run after cleaning, a hanger has likely pulled loose and the slope needs re-setting.
schedule60 min savings$0–30
gavel Check your province first AB: homeowner may do this · BC: homeowner may do this · ON: homeowner may do this · PE: homeowner may do this · QC: homeowner may do this
Cleaning gutters from a ladder is routine homeowner maintenance in every province; the real limit is working safely at height, not any permit.

handymanHow to fix it

Clear the downspout by flushing from the top or tapping to find the clog, reconnect any separated sections, and fit an extension at the bottom that carries water at least 1.5 to 2 metres away from the foundation onto sloped ground.

  1. Tap along the downspout from the ground: a dull thud marks where the clog sits. Try flushing it from the top with a hose to push the blockage out the bottom.
  2. If it won't clear, gently disassemble the affected section, remove the debris, and reseat the joints — reconnect any elbow or section that has separated.
  3. Fit an extension or splash block at the bottom so water discharges at least 1.5 to 2 metres from the house, onto ground that slopes away from the foundation.
  4. Watch it in the next rain: water should exit briskly at the bottom and run away from the house, not pool at the base of the wall.
schedule45 min savings$15–40
Downspout extensionA hinged or flexible extension / splash block sized to your downspout outlet (usually 2x3" or 3x4")
gavel Check your province first AB: homeowner may do this · BC: homeowner may do this · ON: homeowner may do this · PE: homeowner may do this · QC: homeowner may do this
Clearing a downspout and adding an extension is DIY-permitted, but municipal drainage bylaws vary on where roof water may discharge — keep it on your own property, away from the foundation and off neighbouring lots; confirm local rules before altering a buried/connected drain.

verifiedWhy this one goes to a pro

Working out whether your gutters and downspouts are undersized, and replacing them with a larger profile or adding outlets, means load-and-slope calculations plus a full run of work at height. In Canada this is a job for a general contractor or a gutter installer — they can confirm the sizing quickly and do the replacement safely.

Your notes travel with the request — what you saw, what you ruled out, when it started — so the pro arrives with a head start instead of a mystery.

report This means working at the roof edgeFitting a drip edge or gutter apron means lifting the bottom course of shingles and working right at the edge of the roof — one of the most dangerous spots to stand. If you're not set up to work there safely, or the roof is steep, this is a roofer's job, and a small one for them. Never attempt it on a wet or icy roof or without proper fall protection.
sort

Why the list is in this order

We don’t sort by likelihood alone. We sort the way a good, honest tradesperson thinks: rule out the free, safe, common causes first. That’s why the cheap checks outrank the expensive repairs — and why anything dangerous gets a hard stop instead of a pep talk. The order exists to save you money, not to sell you anything.