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While sagging floors aren’t inherently dangerous, they indicate a larger underlying problem that could become a danger to you and your family. If you notice sagging, get your floors inspected.

Floors might sag due to foundation problems, improper framing, uneven or damaged subflooring from water damage, or rot and insect damage.

It’s best to leave floor repair work to the professionals. Complicated floor repair work, especially where joists are involved, are complex projects that require specialized training and equipment. Many stores that sell flooring run deals that include free or discounted installation.

Repairing cracks in your basement costs $250 to $800. Larger problems in your foundation can bring the total cost up to $7,500.

Replacing floor joists in a crawl space costs $100 to $300 per joist if the professional can easily access the joists. Individual joist repair costs can jump sharply (to $1,000 or more) if the joists are covered, insulated, or generally difficult to access.

The average cost to install flooring ranges from $3 to $22 per square foot, depending on the type. Most homeowners pay an average of $12.50 per square foot.