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How deep should be the foundation of my house provided that my neighbour's house foundation is 3 meters deep and 50 cm away from my land and my house's foundation is without external bases only wall in a trench toped by beams?

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Ensuring Stability: The Depth of Your Home’s Foundation

When it comes to building a house, one of the most critical decisions you’ll make is how deep to lay the foundation. It’s not just a matter of digging a hole and pouring concrete; the depth of your foundation is a calculated choice that affects the stability and longevity of your home.

The Neighbor’s Influence

You might wonder if your neighbor’s foundation, which is 3 meters deep and only 50 cm from your property line, should influence the depth of your own foundation. While it’s important to consider their proximity, your foundation’s requirements could be quite different. Factors such as soil composition, the weight of your home, and local building codes play a significant role in this decision.

Foundation Without External Bases

Your house’s foundation, described as a wall in a trench topped by beams and without external bases, presents a unique scenario. This type of foundation, often referred to as a “strip foundation,” is commonly used where the soil has good bearing capacity and the loads from the building are relatively light.

Determining the Right Depth

To determine the appropriate depth for your foundation, consider the following steps:

  1. Soil Testing: Before any construction begins, have a professional conduct soil tests to determine the soil’s bearing capacity. This will help you understand how deep the foundation needs to be to support the weight of your home safely.

  2. Frost Line Consideration: Ensure that the foundation extends below the frost line to prevent heaving during freeze-thaw cycles. In many regions, this means going at least 12 inches below undisturbed soil.

  3. Load Distribution: The design of your foundation should distribute the load of your home evenly across the soil. This might mean going deeper than your neighbor’s foundation if your home is heavier or the soil requires it.

  4. Local Regulations: Always adhere to local building codes and regulations. These are in place to ensure safety and may dictate minimum depth requirements for your foundation.

  5. Professional Guidance: Consult with a structural engineer who can assess all these factors and provide a tailored solution for your home’s foundation.


While your neighbor’s deep foundation might seem like a benchmark, it’s essential to understand that every home is different. By focusing on the specific needs of your property and seeking professional advice, you can ensure that your foundation is as deep as it needs to be—no more, no less—for a stable and secure home.


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