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uk Home & property emergencies gutters overflowing • gutter overflow • water cascading down walls • rainwater running down exterior • downpipe blocked • gutter downpipe blockage • leaking gutter during rain • water pouring over gutter edge • overflow at downpipe outlet • water seeping into walls • external wall water ingress • damp patches after heavy rain • storm runoff problem • emergency home water issue • water near sockets • wet wall by electrics • blocked road gully • blocked public drain • surface water pooling by house • downpipe discharging too close

What to do if…
your gutters are overflowing and water is cascading down the exterior walls

Short answer

Get to a safe pause, then prioritise electrical safety and limiting water entry: check indoors for water near electrics, contain any drips, and use ground-level temporary diversion until the rain eases.

Do not do these things

  • Do not use ladders or go onto the roof while it’s wet, windy, or you’re rushing/panicked.
  • Do not touch electrical switches, sockets, or fittings if the area is wet or you’re standing in water.
  • Do not poke tools into downpipes or guttering if there’s any chance you’re near external wiring, lights, or damaged electrical equipment.
  • Do not force water into a blocked downpipe with a hose if you can’t see where it will discharge.
  • Do not start “proper repairs” (resealing joints, rehanging gutters, removing sections) while water is still actively cascading.

What to do now

  1. Check for immediate danger inside (especially electrics). Check the inside of the affected wall(s) and nearby ceilings: active dripping, spreading damp patches, water near light fittings, and damp around sockets.
    • If water is near electrics, do not touch any electrical switch if you’re standing in water or the area is wet. Keep people out of that area.
    • If it’s safe and dry to access, switch off power at the main switch to the property area affected.
  2. Contain indoors first. Put towels and buckets/trays under any drips. Move valuables and soft furnishings away from the wall and off the floor (especially on the ground floor).
  3. Do safe, ground-level checks outside. From the ground only, look for the obvious: a downpipe outlet packed with leaves, a blocked shoe at the bottom of the downpipe, or a nearby gully grate covered with debris. Clear only what you can reach safely.
  4. Reduce wall saturation with a temporary diversion. If the overflow is concentrated at one point, place a large container/tub under the main spill to reduce splashback onto brickwork and around airbricks.
  5. Carry the water away from the wall/foundations (temporary). If you have one, fit a temporary downpipe extension (flexible hose/pipe) and guide discharge well away from the wall to a spot that drains away from the house (as far as your extension safely reaches). If you don’t, improvise a short “chute” with plastic sheeting weighted down to guide water away from airbricks, thresholds, and window surrounds.
  6. If it’s becoming a wider drainage problem, contact the right place.
    • Blocked public drain / flooded road: report to your local council (public highways drains/gullies).
    • Sewer flooding or burst water main: contact your local water company.
    • Main river/serious environmental flooding: the Environment Agency incident hotline can take reports.
    • Immediate danger to life: call 999.
  7. If you see dangerous damage to external electrical equipment (sparking, fallen lines, damaged street/house service equipment), keep away and call 105 (GB) or 999 if immediate danger.

What can wait

  • You do not need to diagnose the exact cause (blocked downpipe vs poor gutter fall vs undersized guttering) while it’s still raining heavily.
  • You do not need to get on ladders, remove guttering, or do sealant work today if conditions are unsafe.
  • You do not need to start drying plaster or running dehumidifiers until you’re confident water ingress has stopped and electrics are safe.
  • You do not need to decide about insurance or contractors right now if you’ve stabilised and limited spread.

Important reassurance

Overflowing gutters can look dramatic because the water is concentrated in one place. If you focus on (1) electrical safety, (2) keeping water away from openings like airbricks/thresholds, and (3) temporary diversion, you’re doing the right things for now.

Scope note

This is first-steps-only guidance to reduce harm and buy time. Once conditions are safe, further checks (blockages, gutter fall, leaking joints, damaged fascia/soffit, and drainage issues at ground level) may need a competent tradesperson.

Important note

This is general information, not a substitute for professional assessment. If you suspect electrical danger, structural damage, or significant flooding, prioritise safety and seek urgent help.

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