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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.

Failing to clean your gutters can lead to serious and costly damage. When leaves and other debris cause blockages, water cannot drain properly and will overflow. This can lead to water pooling around your home’s foundation, causing basement flooding and structural damage. The overflow can also damage your roof, siding, and fascia boards, with the constant moisture promoting mold, mildew, and rot. The weight of wet debris can cause gutters to sag or break, while stagnant water creates a breeding ground for pests like mosquitoes and rodents. Additionally, runoff can damage landscaping or freeze on driveways and patios, causing cracks. To prevent these issues, it is recommended to clean your gutters at least once or twice a year.

Any small amount of standing water can be damaging to your gutters. It’s recommended that a ¼ inch puddle or more should be addressed. Failure to keep water from pooling in your gutters can result in clogs, algae growth, and pests that damage your gutters over time. 

If you want to avoid burying your downspouts, several alternatives can help direct water away from your home's foundation. One option is to connect a rain barrel to your downspout. During a storm, the barrel collects water that you can later use for irrigating your lawn or garden. Another common solution is to install an above-ground downspout extension. This can be done in a couple of ways:

• Splash Guards: Placing a splash guard, available at most hardware stores, under your downspout can act as a simple funnel to direct water away from the house.

• Downspout Extensions: You can add an extension to the end of the downspout's elbow to carry water further into your yard. Some extensions are flexible, allowing you to maneuver them around landscaping.

These above-ground solutions are particularly useful if your home has a slab foundation that you cannot dig up. However, they have limitations. An extension may not move water as far from your home as an underground system. More importantly, if your yard slopes back toward your house, these methods will be ineffective, and burying your downspouts remains the best option to prevent potential flooding and water damage.