Houses should be built a minimum of ______ feet away from existing, mature trees.

The correct answer is 20 feet. This distance is significant as it takes into account the health of the tree as well as the structural integrity of the house. When houses are built too close to mature trees, roots can disrupt the foundation of the building, leading to potential structural issues. Additionally, the proximity can cause damage to the tree itself, which might struggle for nutrients and space if its roots are constricted. A distance of 20 feet is generally recommended to ensure that there is enough space for both the tree to thrive and for the home to be safe from potential risks posed by the trees, such as falling branches or root encroachment. This approach not only helps in maintaining healthy landscaping but also mitigates issues related to property damage and maintenance costs.