Whatever the cause of foundation issues, you can expect to pay an average repair bill of just under $5,000. More specifically, the national average ranges from $2,137 to $7,426. Of course, that depends on the type of problem needing fixed and other factors, such as where you live and the type of material your foundation is made of.

Of course, as with any home damage, there are extreme cases that require much higher repair costs. For this post, we’ve gathered estimates for the more common foundation issues a homeowner might face. A breakdown of costs for specific repairs could look like this:

• Simple crack in a poured concrete wall: $350-$4,000. Cracks are often caused by either settling soil or variations in the soil’s moisture. Vertical cracks tend to be cheaper to fix, and are done so by filling with a polyurethane-based or epoxy-based filler, then sealed.
• Repair of minor cracks by injecting epoxy or polyurethane foam: between $250 and $800. They should be addressed to prevent moisture ingress that could lead to structural issues. Cracks that are wider than one-eighth of an inch should be seen by a structural engineer.
• House settling or sinking: $1,000-$25,000. If your home has settled significantly, contractors can raise it back up and shore it up with foundation piers for $1,000 to $3,000 per unit, or by slabjacking or mudjacking — a process that involves pumping a concrete mix under the foundation to raise it up. This typically costs between $500 and $1,300.
• House shifting: $700-$25,000. Depending on the severity of the shifting, this is usually repaired by installing piers, mudjacking, foam jacking, or reinforcing the walls.
• Crumbling foundation: $500-$20,000. Water or old age are the usual culprits. Minor issues can be addressed by using epoxy and polyurethane fillers. Bigger issues will need to address the cause and could require installation of piers.
• Bowing foundation walls: $700-$15,000, depending on how many and how bad the damage is. Bowing walls are caused by shifting soil, water damage, or sinking. Bowing walls can be fixed by applying carbon fiber strips with epoxy or reinforcing the walls with anchor plates and steel rods. For severe bowing, piers may need to be installed.
• Underpinning the basement: For $1,000 to $3,000 per pier, contractors will excavate and install hydraulic piers to raise the foundation.

Sources: HomeAdvisor, Fixr and Angi.

Additional costs could include:

• Obtaining a soil report – Soil testing generally costs between $700 and $1,800, but a pH level test with information about pesticide residue, heavy metals, and industrial chemicals can run $1,200. To get a more detailed report for all contaminants and shifting soil factors can run as high as $5,000.
• Hiring a structural engineer – The cost for a residential structural engineer averages $513. Many of them charge $100 to $200 per hour. 
• Obtaining a building permit – The national average for building permits is $1,281, but costs vary regionally and the type of permit you need.
• Dealing with hidden obstacles – If tree roots cause your home’s foundation to heave, the tree may have to go. Depending on its size and accessibility, it can cost anywhere from $200 to $2,000 to take it down.