Why Blocked Gutters Cause More Damage in Winter Than Any Other Season

Short answer: once gutters are blocked, rainwater has nowhere to go but over the edge and down the wall, or backed up under the roof covering — and freezing overnight turns a slow leak into a much bigger, faster one. Clearing them in autumn, before the leaves fully come down, is the cheapest prevention there is.

What actually goes wrong

A gutter's whole job is to carry water away from the roofline and foundations. Once it's packed with leaves and debris, water overflows straight down the exterior wall instead, which can lead to damp patches inside, staining on brickwork, and — over a season or two — mortar and render breaking down from repeated saturation. In colder snaps, trapped water in a blocked gutter or downpipe can freeze and expand, cracking the gutter itself or splitting a joint.

Signs your gutters need attention

• Water visibly overflowing during or after rain, rather than draining through the downpipe
• Sagging sections, or gutters pulling away from their brackets
• Plant growth or moss visible in the gutter line
• Damp patches appearing on an internal wall near the roofline, which can point to water already getting behind the guttering — see our guide to winter damp and condensation for how to tell the difference from condensation

Timing matters

Clearing gutters too early in autumn means you'll need to do it again once the leaves finish falling — but leaving it until December risks the first heavy rain or frost doing damage before you get to it. Late October to mid-November is usually the practical window in the South East, after most leaves are down but before the worst of the winter weather.

When it's worth calling someone in

Ground-floor gutters on a bungalow are one thing; a two- or three-storey Victorian terrace is another. Our guttering, fascias and soffits team clears, repairs and replaces gutters safely at height, and can flag any fascia or soffit damage — often caused by exactly this kind of long-term water exposure — while they're up there.

This is general seasonal guidance for the South East of England, and the right timing for your own property depends on its specific condition, aspect and exposure. Get in touch if you'd like us to take a look before the weather turns.