When should I worry about foundation cracks? 

Every crack in your foundation or walls should warrant some concern, as they typically indicate foundation issues. Horizontal, diagonal, and stair-step cracks growing in width and gaps around windows and doors should be examined. Cracks accompanying bowing walls and uneven floors are of even more concern. Additionally, if you live in a coastal area of North Carolina with sandy soil and rising sea levels, you may be at higher risk of foundation issues.