Foundation Inspection: 7 Signs You Need One

Your foundation is the most important structural element of your home. Foundation problems don't fix themselves — they worsen over time and become exponentially more expensive to repair. Here are 7 warning signs that mean you should call a licensed structural engineer.

1. Cracks in Walls or Ceilings

Diagonal cracks emanating from door or window corners, or horizontal cracks in basement walls, often indicate foundation settlement or soil pressure. Small hairline cracks may be cosmetic, but cracks wider than 1/4 inch or growing over time need professional evaluation.

2. Doors and Windows That Stick

If doors or windows that used to open smoothly now stick, bind, or won't close properly, the frame may have shifted due to foundation movement. This is one of the earliest and most common signs of foundation settlement.

3. Sloping or Uneven Floors

Place a marble on the floor — if it rolls, you have a slope. Sloping floors indicate differential settlement, where one part of the foundation has sunk more than another. This is common in California homes on expansive clay soils.

4. Cracks in the Foundation Itself

Vertical cracks in concrete foundations may be from normal curing, but horizontal cracks, stair-step cracks in brick, or cracks wider than 1/4 inch are structural concerns that require engineer evaluation.

5. Gaps Around Doors or Windows

Visible gaps between door frames and walls, or between window frames and siding, indicate the structure is pulling apart — often from foundation movement.

6. Water Intrusion in Basement or Crawlspace

Water in the crawlspace or basement can indicate foundation cracks, poor drainage, or hydrostatic pressure. Water degrades foundations over time and should be addressed immediately.

7. Nail Pops and Separating Trim

Nail pops in drywall, separating crown molding, or gaps where walls meet ceilings can all be signs that the structure is shifting due to foundation movement.

What to Do Next

If you notice any of these signs, call a California-licensed structural engineer for a professional inspection. We'll assess the cause, document the condition, and provide a written report with recommended solutions. Early detection saves thousands in repair costs.