Gutters should be cleaned at least twice a year, in the spring and in the fall, to remove the debris from trees that can clog the eavestroughs and downspouts. Debris like leaves, twigs, and seed pods can build up and cause your gutters to overflow, potentially causing damage to your roof and foundation. Water backing up under the shingles can rot the edge of your roofline. Overflow water falling next to your foundation can end up leaking into your basement or crawl space.

There are several ways to tell if your gutter downspout drain is backed up. The most obvious sign is when you see water flowing over your gutter edges. This can occur during everything from light rain to a rainstorm. Additional signs can include peeling paint around your downspout, visible dirt around your downspout, and moisture on the side of the house. If you're having ongoing problems with clogs caused by a poorly designed or worn-out gutter system, consider getting a quote for gutter replacement cost.

If not properly maintained, an underground downspout may damage your home's foundation. A clogged downspout can back up, causing water to pool around the base of your home and seep into the foundation. Regular inspections and maintenance keep your downspout in good working order, preventing damage and protecting your home.

The cost to install a downspout extension or reroute a downspout generally falls between $30 and $200. The final price depends on factors like whether you DIY the project or hire a gutter professional, the complexity of your gutter system, and the length of the new extension. A simple, above-ground DIY installation can cost as little as $30 for materials. In contrast, a more complex project involving professional installation and digging trenches for underground piping could cost over $1,000. This is still a significant saving compared to replacing your entire gutter system, which costs around $1,900 on average.