The best type of foundation for a house depends on factors like climate, soil conditions, budget, and your home's specific needs. In marshy areas, deep piles driven into bedrock provide stability, whereas in arid climates with high water tables, a slab-on-grade is suitable. Monolithic slab foundations are the most cost-effective, costing $5 to $16 per square foot, as they require less material and labor. Basements work well in areas with low water tables and provide additional living space. Consult with a professional to determine the best foundation type for your project.

When choosing a foundation contractor, it's important to get several estimates, ask for references, and find the best fit for your project. Review each estimate carefully to ensure there are no hidden expenses. The best contractors are communicative and transparent from the start, helping you understand every step of the process. Additionally, verify that the contractor is licensed, insured, and experienced in the type of foundation work you require. Checking online reviews and asking for recommendations from friends or family can also help you make an informed decision.

A well-built concrete foundation can last 80 to 100 years or even longer. The longevity of a foundation depends on several factors, such as soil and weather conditions, quality of construction materials, and proper installation. Signs of foundation damage include sloping floors, bowing walls, doors and windows that don't operate properly, wall cracks, and gaps between walls and ceilings. Regular maintenance and prompt repairs can extend the life of your foundation.

Foundation depth depends mostly on climate, foundation type, and the soil type you’re building on, and can range from almost-surface level to dozens of feet deep. Your pro should know and follow all local and state building requirements. Still, it’s always best to check local requirements yourself to confirm foundation depth requirements.

Most concrete slab foundations are 4 to 6 inches thick. However, heavier homes might require thicker slabs, especially if the slab will support a garage holding several large vehicles and/or machinery. Your needs, budget, and local building codes will impact your slab’s thickness. Be sure to discuss these and other factors with your pro.