Your gutters are the most overlooked part of your home. They work silently when clean, and destroy silently when clogged. Here are the 5 warning signs every GTA homeowner should know.
1 Water Overflowing During Rain
The most obvious sign. If water pours over the edges of your gutters during rain instead of flowing through the downspouts, they're clogged. Watch your gutters during the next rainstorm — waterfall effect at any point means blockage.
Where to look: The corners and downspout connections clog first. Check these spots specifically.
2 Plants Growing in Your Gutters
If you can see weeds, grass, or seedlings growing from your gutters — you're way past due. Seeds need soil and moisture to sprout. If plants are growing, there's enough decomposed organic matter to form soil, and enough standing water to sustain growth.
How it happens: Maple seeds, elm seeds, and dandelion fluff land in debris. One spring rainstorm, and you've got a garden 20 feet up.
3 Staining or Mould on Your Siding
This is the one people miss. Dark streaks, green mould, or water stains on your siding — specifically below the gutter line — mean water has been overflowing and running down your walls. By the time you see staining, it's been happening for months.
The hidden damage: Behind that staining, moisture is penetrating your sheathing and insulation. You can't see it from outside, but mould is growing inside your wall cavity.
4 Birds or Pests Nesting
Birds love clogged gutters — standing water for drinking, decomposed material for nesting, and protection from wind. If you see birds repeatedly visiting your gutters, or hear scratching sounds, you likely have nests. Squirrels, mice, and insects also move in.
Spring problem: March-May is peak nesting season in the GTA. Once nests are established with eggs, removal becomes complicated and may require waiting for hatchlings to leave.
5 Gutters Sagging or Pulling Away
Gutters are designed to carry water — about 1.5 lbs per linear foot. Wet debris, standing water, and ice can increase that weight to 10+ lbs per foot. When you see gutters sagging, bowing, or pulling away from the fascia, the weight has exceeded what the hardware can support.
Winter escalation: In Toronto's freeze-thaw cycles, standing water in clogged gutters freezes and expands. Ice is heavier than water. One hard freeze can tear gutters off entirely.
The Math That Matters
| Option | Cost | Frequency | Annual |
|---|---|---|---|
| Professional gutter cleaning | $250-$400 | 2x/year | $500-$800 |
| Ice dam repair | $1,000-$5,000 | Once | — |
| Foundation repair | $10,000-$50,000 | Once | — |
| Basement flooding cleanup | $5,000-$20,000 | Once | — |
| Mould remediation | $3,000-$15,000 | Once | — |
When to Clean Gutters in the GTA
Spring (April-May): Remove winter debris, seeds, and pollen. Check for ice damage from winter.
Fall (Late October-November): Remove leaf drop before winter freezing. This is the critical cleaning — never skip it.
Summer (July-August): Only if near heavy tree canopy (Kingsway, Unionville, Kleinburg, Forest Hill).
FAQ
How do I know if my gutters need cleaning?
Any of the 5 signs above. Or: if it's been more than 6 months since your last cleaning, they need it.
Can I check myself?
For single-storey: yes, with a stable ladder. Look for standing water, debris, and plant growth. For 2+ storey: don't risk it — ladder falls are the #1 home maintenance injury.
How much does cleaning cost?
$179-$499 depending on home size. See full pricing →
See Any of These Signs?
Get a free gutter cleaning estimate within 2 hours. Before that $250 job becomes $10,000.
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