Can a Neighbor's New Construction Increase My Flooding Risk?

Construction disturbs the natural landscape and drainage patterns. Before building, the ground absorbs some rainwater. Adding large, impermeable surfaces like concrete foundations and driveways prevents absorption, increasing runoff. This runoff must go somewhere, and poor planning can send it onto neighboring lots.

The grading, or slope of the land, is critical. Builders often grade a new lot to protect the new foundation. This involves moving large amounts of soil to create slopes that direct water away. If your property is downhill or adjacent, this redirected water can become your new problem.

Start by documenting the situation with photos and videos, especially during or after rain. Show where water is pooling and the path it takes from the construction site to your property. Keep a dated log of your observations and any conversations you have with your neighbor or the builder.

Speak with your neighbor first, as they may be unaware of the problem. Discuss your concerns calmly and share your documentation. If the issue stems from the builder's work, your neighbor may need to contact them. For persistent problems, you may need to involve local authorities.

While you seek a long-term solution, take steps to shield your home. Ensure your own gutters and downspouts are clear and extend at least five feet from your foundation. Consider installing temporary barriers like sandbags if you anticipate heavy rain and know water flows toward a specific area.

Inspect your crawlspace and foundation walls regularly for new signs of moisture or seepage. If water does enter your home, acting quickly is key. Remove standing water and wet materials to prevent secondary damage like mold, which can develop within 24 to 48 hours in damp conditions.