> Pricier homes of the Pacific Northwest are usually well-clear of the larger trees that challenge foundations. That's not an accurate explanation. In the PNW,

> Pricier homes of the Pacific Northwest are usually well-clear of the larger trees that challenge foundations. That's not an accurate explanation. In the PNW, in many cities, older more expensive neighborhoods tend to have more trees, not less. It's a serious equity issue, given the heat island effect. The difference in foundation damage is because of soil profiles, not planting behaviors. We don't tend to have expansive soils around here. Take away the clay and you lose the hydrological forces which allow tree root to inhabit previously occupied pores.