Although chipmunks are native to woodlands, they thrive in suburbia. Chipmunks eat bulbs, fruits and young plants, but their most costly behavior is burrowing, which can cause structural damage to sidewalks, stairs or even foundations. Chipmunks do not chew wood, so they are not a hazard to trees, porch posts or walls; only their burrowing causes damage. If burrows are extensive enough to damage your house, they are probably overpopulated for the habitat.
Make your yard less inviting to chipmunks by moving bird feeders 15 to 30 feet from your house; chipmunks love to eat spilled birdseed. They prefer continuous cover, so do not plant shrubs or ground covers in a continuous line between your yard and nearby wild or overgrown areas.