Foundation Repair · Common problems · Updated November 2026
Sloping or Uneven Floors: Causes and Next Steps
Many older homes have floors that are a little out of level. A slope that is getting worse, or that comes with cracks and sticking doors, is worth having checked.
If a floor feels soft or springy enough that you worry it could give way, keep heavy furniture and people off that area until it is inspected.
Common causes
- Foundation settlement, often at one corner.
- Sagging or undersized floor joists, or a beam that needs more support.
- Rot or insect damage in joists or the sill plate.
- Moisture problems in a crawl space.
- Damaged subfloor (soft spots rather than a steady slope; see subfloor repair).
What you can safely check
- Roll a marble or use a long level to see which direction the floor slopes.
- Note whether the slope is gradual across a room or a dip in one area.
- Look in the basement or crawl space (if safe to access) for sagging beams, damp wood or posts that are leaning.
- Check for related signs: foundation cracks and sticking doors.
When to call a pro
Call a structural engineer or foundation contractor if the slope is increasing, comes with cracks or sticking doors, or you find damaged framing. Fixes range from adding support posts under a beam to piers under the foundation ($1,000–$3,000 per pier). See the foundation repair cost guide.
Cost figures are national ranges from the sources listed in our foundation repair cost guide, not a quote from FixFinch or any contractor. This article is general information to help you decide on next steps. It is not an inspection or professional advice; a qualified pro who sees the problem in person can tell you what is actually going on.