12Cost to sister floor joists$100 – $300 per joistCost to replace floor joists$6,000 – $10,000+Cost to replace floor joists, jack required$20,000+

How much does joist replacement cost?

The long beams that provide the main structural support for the floor can cost $200 to $500 per room or $10 to $67 per square foot to repair. A full replacement costs $5,000 to $20,000. If you’re only repairing individual joists, expect to pay $100 to $300 per joist.

How much does Sistering joists cost?

Total costs will depend on the extent of the damage and the ease of access to the joists (through a basement or crawlspace), but in general sistering averages $100-$300 or more per joist, and could run $1,000-$3,000 or more to repair a tilted, wavy or bouncy floor under an average room.