Foundation Design & Structural Calculations

The foundation is the most critical element of any new structure—whether it's a house extension, a garden room, or a complete new build. We provide professional foundation structural design and calculations to ensure the ground can safely support the intended loads, guaranteeing compliance with Part A of the UK Building Regulations and preventing costly movement or subsidence.

⚙ Foundation Types We Specialise In

Foundation selection depends entirely on soil type, tree roots, and the loads being transferred. We provide certified design for:

• Traditional Strip Foundations: Calculations for trench depth and width based on safe bearing capacity for standard residential extensions.
• Trench Fill Foundations: Optimising the use of concrete to fill trenches, providing a solid base where deep excavation is required.
• Raft/Slab Foundations: Design for reinforced concrete slabs, necessary for poor ground conditions or where wider load distribution is required.
• Piled Foundations with Ground Beams: Specialist design for complex or expansive clay soils (e.g., areas with significant clay content or nearby trees), ensuring the structure is founded on stable ground.
• Underpinning Design: Structural design and methodology for strengthening or deepening existing foundations.

The Importance of Structural Foundation Design

Without detailed foundation calculations, your project cannot gain approval from Building Control. A correctly engineered foundation prevents structural failure, which can be devastatingly expensive to fix after construction.

• Compliance: Our calculations are mandatory evidence that the foundation meets safety standards and is appropriate for the sub-soil conditions.
• Cost Efficiency: We aim to design the minimum required depth and concrete volume, preventing builders from over-digging or over-specifying materials.
• Risk Management: We account for external factors like tree root influence (which is common across many urban areas in Kent) to mitigate future heave or settlement.

Our Simple 3-Step Foundation Design Process

1. Review Plans & Site Information We analyse your architectural drawings, proposed loads, and any available trial hole or soil reports to determine the ground conditions.
2. Calculate & Optimise Design We perform detailed calculations to determine the required foundation type, depth, width, and any necessary reinforcement (steel mesh/rebar).
3. Deliver Certified Drawings You receive the final foundation plan and structural report, ready for the building contractor and submission to the local Building Control department.

Areas Covered

Contact ProStructural Design

Email: info@prostructuraldesign.com
Phone: +44 777 464 0260

Contact us to ensure your project starts safely with a robust, compliant foundation design.