Gutters Overflowing? Why It Happens and How to Fix It
Short answerGutters often overflow because leaves and debris clog the gutter or the downspout. Clean them twice a year, more often under trees. If they still overflow, flush the downspout with a hose, then check for sagging sections and loose hangers. Extend downspouts at least 5 feet from the foundation so the water stays away from your basement.
Safety first
- Use a sturdy ladder on firm, level ground, and have someone hold it. Do not lean out to the side. If the roof is high or steep, hire it out.
- Keep ladders well away from overhead power lines and the wires that enter the house.
- Do not climb a wet ladder or work during a storm. Stay off the roof. Wear gloves, since metal edges and debris can cut.
Likely causes
| Cause | How to tell | What fixes it |
|---|---|---|
| Clogged gutter | Water spills over at one spot, and you can see leaves or plants growing. | Scoop out the debris. |
| Clogged downspout or elbow | The gutter fills while little comes out the bottom. | Flush it from the top with a hose, or take the elbow off and clear it. |
| Sagging gutter or loose hangers | Water pools in the middle or runs away from the downspout. | Tighten or add hangers so the gutter slopes toward the downspout. |
| Gutters too small for the roof | They are clean and well sloped but overflow in heavy rain. | Ask a gutter installer about a larger gutter or more downspouts. |
| Rusted or split gutters | Drips at the seams or holes, and rust. | Seal small leaks, or replace the damaged section. |
What you need
- Sturdy ladder
- Work gloves and eye protection
- Gutter scoop or small trowel
- Bucket
- Garden hose
- Screwdriver or drill
- Downspout extensions or splash blocks
How to fix it
- Set up safely. Place the ladder on firm ground, away from power lines, and have a helper hold it. Move the ladder often instead of reaching.
- Scoop out the gutter. Start near the downspout and work away. Put debris in a bucket, not on the ground by the foundation.
- Flush with a hose. Run water in the far end and watch how it flows. It should move toward the downspout, with no puddles left behind.
- Clear the downspout. If water backs up, flush the downspout from the top. If it stays clogged, take off the bottom elbow and clear it by hand.
- Check the hangers and seams. Look for loose hangers, sagging sections, leaks and rust. Tighten or add hangers, and seal small leaks.
- Send the water away. Extend the downspouts at least 5 feet from the foundation, and use a splash block to prevent erosion. Do not aim water at a neighbor's yard without talking to them first.
When to call a professional
- The roof is high or steep, or you are not comfortable on a ladder.
- Gutters are pulling off, or the fascia board behind them looks rotted.
- Water still overflows after they are clean and sloped right.
What it costs to have fixed
Gutter Replacement is estimated at $700 to $2,950 nationally. See your state
Common questions
Why are my gutters overflowing even though they are clean?
Check the downspout first, because a clog at an elbow is easy to miss. Then look for a sagging section. If neither is the problem, your gutters or downspouts may be too small for heavy rain.
How often should I clean my gutters?
University of Nebraska Extension says twice a year. Homes under trees often need it more.
How far should downspouts extend from the house?
At least 5 feet from the foundation, according to University of Nebraska Extension, to help keep water out of the basement.
Can overflowing gutters cause basement leaks?
Yes, they can send water toward the foundation. Kansas State University says gutters, downspouts and extensions must be maintained to keep water from running into a basement, and to check them monthly or even weekly in the wet season. Source
How much water can a roof send to the gutters in heavy rain?
University of Nebraska Extension says 1 inch of rain on a 1200 square foot roof produces about 750 gallons, so we recommend keeping gutters clean and downspouts clear. Source
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Last verified 2026-11-01
Sources
- University of Nebraska Extension: Publication G2186 — Cleaning gutters and downspouts twice a year, extending downspouts at least 5 feet, and splash blocks
- NC State Extension: Preventative Home Maintenance — Keeping gutters and downspouts open and in repair, checking hangers, strainers, leaks and rust, and water draining away from the foundation
- FEMA: Protect Your Home From Flooding — Cleaning gutters, downspouts and splash pads so roof water flows away, and consulting neighbors before extending downspouts
- Kansas State University: Dry Basements and Crawl Spaces — Gutters and extensions need upkeep to keep water out of the basement
- NFPA: Electrical Safety Checklist — Keeping ladders away from overhead power lines and the service wires into the home
General information, not professional advice. Conditions, codes and prices vary. Turn off power, gas or water before any work, and hire a licensed professional when in doubt. Cost figures are our estimates, not quotes.