How long should a downspout extension be?

At least several feet from the foundation, and longer on flat lots. Longer is better as long as the water can keep moving.

Are flip-up extensions any good?

Yes, for lawns you mow. They lift out of the way and drop back down when water flows.

Will an extension fix a wet foundation?

Often, if the ground slopes away from the house. If it doesn't, a buried drain is the better fix.

Downspout Extensions Water Landed Away From the Wall

The cheapest fix for a wet foundation is often a longer downspout. An extension carries water several feet from the house, and on a lot that slopes away it can be all you need. Options include rigid aluminum or PVC extensions, flip-up extensions that lift out of the way for mowing, and flexible hoses. They work best where the ground slopes away, and they're not right where a walkway or a mower has to cross them.

Cost & Scope

Extensions typically run $75 to $450 for a whole house, depending on how many downspouts need them and how long they are. Basic splash blocks cost the least; rigid extensions with a stable landing cost more.

If the yard is flat or the extension would cross a walkway, a buried drain is a better answer than a longer extension.

Cost Range

$75 – $450

Timeframe

Half Day

Warranty

1-Year Warranty

Get a Free Downspout Extensions Estimate

Written, in-person, no obligation.

Important Considerations

Before choosing an extension:

Slope — an extension only works if the ground falls away from the house.
Traffic — mowers, walkways, and kids don't mix well with extensions lying on the lawn.
Style — flip-up and pop-up types stay out of the way when dry.
Length — several feet from the foundation is the minimum, and more is better on flat lots.

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Free written estimate, no pressure.

Materials We Use

Common extension types:

Rigid aluminum or PVC extension

Flip-up extension

Flexible extension hose

Concrete or plastic splash block

Ground stakes or anchors

Our Process

A quick install:

01
Check the Slope
The lot is checked to make sure water will run away from the house.
02
Choose the Type
Extension chosen for traffic and appearance.
03
Install
Extension fitted to each downspout and anchored.
04
Test
Water run to confirm it lands where intended.

Get Your Project Scheduled

How to Choose a Provider

What to ask:

Where It Lands

The installer should show you where the water ends up.

Honest Alternative

On flat lots, a buried drain may be a better answer.

Guarantee & Support

Written Workmanship Warranty

Every project is backed by a workmanship warranty in writing. If a seam leaks or a section pulls away from application error within the term, the installer comes back at no charge.

Licensed & Insured

Every installer in our network carries liability and workers' comp coverage, verified before they're matched with a homeowner. Details are available on request before you book.

Fixed Written Estimate

The number in your estimate is the number you pay, unless you change the scope yourself mid-project.

Daily Site Cleanup

Old gutter sections, cut-offs, and fasteners hauled away before the crew leaves, every day of the project and not just the last one.

Why Choose Gutters Kingdom

An extension that empties onto a flat lot just moves the puddle a few feet. If your yard doesn't slope away, we'd quote a buried drain instead.

Slope checked before an extension is chosen
Type matched to traffic in the yard
Buried drain quoted when an extension won't do