1. Visible cracks in the walls or floors.
2. Uneven or sloping floors.
3. Gaps around windows and doors.
4. Leaning walls or chimneys.
5. Basement leaks or dampness.
6. Cracks in the concrete slab or foundation.

Foundation problems can be serious and costly, but early detection and repair can help prevent further damage and expense. Here are some common signs that may indicate foundation issues in your home or building:

1. Cracks in walls or floors: Small hairline cracks may be normal in a home’s foundation, but larger cracks can indicate serious structural issues. These cracks can appear in the drywall, flooring, or even the brick or stonework of your home.
2. Uneven or sloping floors: If you notice that your floors are uneven or sloping, it could be a sign of foundation settling or sinking. This can cause doors and windows to stick or become difficult to open or close.
3. Gaps around windows and doors: If you notice gaps around your windows and doors, it could be a sign that the foundation has settled or shifted and is no longer providing adequate support to the structure of your home.
4. Leaning chimneys or walls: A leaning chimney or wall can be a serious sign of foundation issues. This can happen as a result of the soil shifting beneath the foundation or the foundation itself settling or sinking.
5. Basement leaks or dampness: If you notice leaks or dampness in your basement, it could be a sign of foundation settling or shifting. It could also indicate a drainage problem or other water infiltration issues.
6. Cracks in the concrete slab or foundation: If you notice cracks in the concrete slab or foundation of your home, it could be a sign of foundation settling or shifting. These cracks can appear as large or small, diagonal or vertical and can vary in width.

It is important to note that, sometimes, the issues could be caused by other things, like plumbing or drainage problems. Therefore, it is essential to have the foundation of your home or building inspected by a professional to determine the cause of the problem and recommend the best course of action. It is always better to address foundation issues as soon as possible to prevent further damage and expensive repairs in the long run.