House leveling can mean two different jobs. One is lifting and supporting a foundation that has settled. The other, more common inside a house, is fixing floors that dip or bounce because the framing or the posts under it have weakened. HomeGuide says the cause should be fixed rather than covering the problem cosmetically, and it recommends a foundation inspection first [1].
What causes a sagging floor
HomeGuide lists weakened joists, subfloor damage, foundation problems, water or termite damage and uneven slabs as common causes [1]. Manufacturer Foundation Supportworks says sagging or bouncy floors often trace to the crawl space, where supports have settled into poorly compacted soil [2].
In De Pere, the city says a permit may be needed when replacing or moving columns and beams [3]. Check with your own building inspector before posts or beams are changed.
Sagging floor repair options and prices
National figures, not local quotes:
| Repair | Published range | Source |
|---|---|---|
| Surface fixes (shims, leveling compound, small sections) | $300 to $2,000 [1] | HomeGuide, Feb 6, 2026 |
| Subfloor replacement | $2,000 to $7,000 [1] | HomeGuide, Feb 6, 2026 |
| Sistering a joist (new lumber bolted alongside) | $150 to $325 per joist [1]; $200 to $1,000 per joist [4] | HomeGuide, Feb 6 and Apr 20, 2026 |
| Replacing a joist | $350 to $1,000 [1]; $500 to $2,500 [4] | HomeGuide, Feb 6 and Apr 20, 2026 |
| Adding support posts or beams | $1,000 to $5,000 [4] | HomeGuide, Apr 20, 2026 |
| Structural reinforcement of the floor system | $4,500 to $20,000 or more [1] | HomeGuide, Feb 6, 2026 |
| Foundation leveling with shims | $1,000 to $3,500 [5] | HomeGuide, Feb 6, 2026 |
Two HomeGuide guides give different per-joist prices. We show both rather than pick one. If the floor dropped because the foundation settled, the fix may be piers instead. See push piers and helical piers, plus the foundation repair cost guide.
Questions to ask
- What is causing the sag: framing, posts, the soil under them, or the foundation?
- Will the floor be lifted, and how fast? Ask what the plan is for drywall or tile cracks upstairs.
- Will any post, beam or joist be replaced, and does that need a permit in your town?
- What's in the written warranty?
FAQ
Can a floor be leveled all at once?
Ask the contractor. We didn't find a source on lifting speed we trust, so we don't give a number.
Is a bouncy floor a foundation problem?
Not always. HomeGuide lists joist and subfloor issues alongside foundation causes [1]. An inspection should say which.
How much does an inspection cost?
HomeGuide lists a foundation inspection at $300 to $750 [1].
Get quotes
Tell us about the floor and your town, and a local contractor can contact you about an inspection and written quote. Request a free quote.
We're a referral service, not a contractor, and independent contractors may pay us for referrals.
Sources
- HomeGuide, "Sagging Floor Repair Cost," Feb 6, 2026. https://homeguide.com/costs/sagging-floor-repair-cost. Supports: fix underlying problem, schedule inspection ($300 to $750); causes list; surface $300 to $2,000; subfloor $2,000 to $7,000; sistering $150 to $325; replacing $350 to $1,000; structural $4,500 to $20,000+.
- Foundation Supportworks (manufacturer), Signs of Foundation Failure. https://www.foundationsupportworks.com/foundation-repair/signs.html. Supports: sagging or bouncy floors often attributed to crawl space supports settled into poorly compacted soil.
- City of De Pere, "Do I need a Building Permit?" https://www.deperewi.gov/topic/index.php?structureid=15&topicid=506. Supports: permit may be needed when replacing or moving columns and beams.
- HomeGuide, "Floor Joist Repair Cost," Apr 20, 2026. https://homeguide.com/costs/floor-joist-repair-cost. Supports: sistering $200 to $1,000; single joist replacement $500 to $2,500; adding support posts or beams $1,000 to $5,000.
- HomeGuide, "How Much Does Foundation Repair Cost? (2026)," Feb 6, 2026. https://homeguide.com/costs/foundation-repair-cost. Supports: leveling with shims $1,000 to $3,500.