Overflowing gutters: causes and upkeep

Check from the ground. Leave the ladder to a pro.

The answer in 2 lines. An overflowing gutter is almost always clogged (leaves, pine needles, shingle grit, a nest), badly sloped, or draining into a blocked downspout. You can check a lot from the ground during a rain and clear the bottom of the downspout by hand. Cleaning gutters means working on a ladder, which causes many serious falls: if you're not equipped and experienced, hire a gutter-cleaning service.

The first 3 steps

During the rain, look from the ground: where does the water spill over? Along the whole length, or at one spot?
Once the storm has passed, at the bottom of the downspout, pull out leaves blocking the outlet or the extension by hand (with gloves).
If water runs down a wall or gets inside, set out buckets, take photos and note the date.

Stop: danger

Ladder work is where people get hurt: ladder falls send many Americans to the emergency room each year. Never use a ladder in wind or rain, never alone, and never on soft or sloped ground.
Overhead power lines, including the service drop that brings power to the house, often run near gutters: keep ladders, poles and tools well away from them (many utilities say at least 10 feet). A gutter-cleaning safety bulletin lists the basics.
Never walk on the roof to reach a gutter.
Water getting in near an outlet or light: turn off that circuit at the panel only if the panel is dry. Immediate danger: 911.

What you can do yourself, and where to stop

From the ground: clear the bottom of the downspout, check the water flows out, and make sure it ends up away from the foundation.
Look: a gutter that sags, pulls away from the fascia or drips at the seams often shows up on a zoomed phone photo.
Single-story house, flat firm ground, the right ladder: some homeowners clean their own gutters. Use a ladder tall enough and rated for your weight plus tools (the duty rating is on the label: American Ladder Institute: choosing the right ladder); a fiberglass ladder is the safer choice near any wiring. Follow the label, keep three points of contact and have someone hold it.
Stop there for two-story homes, steep lots or anything near power lines: hire a gutter-cleaning service or a roofer.

Possible causes

Leaves, needles and moss: clogged gutter, especially near trees and in the fall.
Always overflows at the same spot: local clog, or not enough slope toward the downspout.
Water doesn't go down the downspout: clogged downspout, or a missing or blocked strainer at its top.
Only overflows in very heavy rain: gutters or downspouts too small for the roof, or an exceptional downpour.
Drips at the seams: failed sealant or a corroded section.
The gutter pulls away from the house: broken or loose hangers.

Send the water away from the house

Water dumped at the foot of the wall can end up in the basement or crawl space. A downspout extension (a plastic or aluminum elbow and pipe, or a splash block, sold at any hardware store) carries it further out; guides commonly recommend discharging it several feet from the foundation, onto ground that slopes away from the house (This Old House: how to extend a downspout, Bob Vila: the right downspout length). The EPA also explains how to redirect downspouts to a lawn, a rain garden or a rain barrel (EPA Soak Up the Rain: disconnect and redirect downspouts). Some cities have rules on where downspouts may discharge: check with yours before you reroute one toward a neighbor or a sidewalk.

When to call a pro, and which one

Gutter-cleaning service: cleaning at height, flushing downspouts. Ask for proof of liability insurance.
Gutter installer or roofer: adjusting the slope, replacing hangers, a section or the whole gutter, adding gutter guards. Get a written estimate.
Plumber or drain company: if the underground drain the downspout feeds into stays clogged.
Water inside: see our guide on roof leaks during a storm.

Preventing the next one

Have gutters cleaned at least once a year, after the leaves fall, and more often under big trees. Twice a year (spring and fall) is common advice; it's not a legal requirement.
Ask about gutter guards or downspout strainers.
Trim branches that hang over the roof.

Who pays and who to tell

Homeowners: gutter cleaning and repairs are upkeep, at your expense. Homeowners policies generally exclude damage caused by lack of maintenance, wear and tear, and flooding from rising surface water; sudden damage, such as a gutter torn off by a storm, is often covered, minus your deductible. Read your policy.
Renters: it depends on your lease and your state. In a single-family rental, some leases put gutter cleaning on the tenant, but you never have to climb a ladder: tell your landlord in writing. Repairs and replacement are usually the landlord's job. See our guide on repairs between tenant and landlord.
Condo or HOA: gutters are usually a common element: tell the HOA or the manager.

In the house Emily rents near Charlotte, the gutter spills over the front door every time it rains. From the ground, she sees leaves sticking out and clears the bottom of the downspout. It keeps overflowing, so she emails her landlord with photos. The landlord sends a gutter service, which also finds a broken hanger and replaces it.

A made-up story, for illustration.

The numbers (latest published)

Cost: Angi's cost guide (2025 data, the latest found) puts professional gutter cleaning for a typical home roughly in the low hundreds of dollars, more for two- or three-story homes (Angi: how much does gutter cleaning cost?). Prices vary by region and house size: get two quotes.
No official national figure on gutter-cleaning frequency: "once or twice a year" is common-sense advice, not a legal requirement.

Bobby

Sources, verification, confidence

Verified on November 1, 2026, for the United States. Confidence: high for ladder and power-line safety and for keeping water away from the foundation; medium for prices, which vary by region, and for who pays in a rental, which depends on your lease and your state. This guide describes common cases, not legal advice.