Signs of Foundation Problems: A Room-by-Room Inspection Guide

Signs by location

• Exterior foundation walls: stair-step cracks in masonry block or brick, horizontal cracks (a more serious sign than vertical ones, often indicating soil pressure), or a visibly bowing wall.
• Interior walls: diagonal cracks, especially radiating from window or door corners — a very common and telling sign, since it follows the natural stress pattern of a settling structure.
• Doors and windows: sudden sticking, or doors that no longer latch/close flush, especially if they used to work fine — the frame has shifted out of square.
• Floors: noticeable sloping (a marble or ball rolling consistently to one side), or new gaps opening between the floor and baseboard.
• Ceilings: cracks where the ceiling meets an interior wall, or separation at crown molding joints.
• Chimneys: a chimney visibly leaning away from the house, or a widening gap between the chimney and the house's exterior wall — chimneys often settle at a different rate than the main structure since they typically have a separate footing.

Pro tip from our network contractors

Not every crack is a foundation emergency — hairline vertical cracks under about 1/16 inch wide are extremely common in poured concrete foundations as they cure and settle in the first few years, and are usually cosmetic. The signs to actually worry about are diagonal or horizontal cracks, cracks wider than roughly 1/4 inch, or any crack that's visibly growing over a period of weeks or months.

What to do if you spot multiple signs

One isolated sign, especially a small cosmetic crack, usually isn't cause for alarm. Multiple signs appearing together — say, sticking doors AND sloping floors AND new wall cracks — is a much stronger signal that real foundation movement is underway, and it's worth having a structural engineer (not just a foundation repair company, which has an obvious incentive to find a problem) do an independent assessment first. Poor drainage is one of the most common and fixable contributors to foundation stress — see clogged gutters and foundation damage and gutter downspout placement and drainage for the piece of this that's often within a homeowner's control to fix before it gets worse.