Structural Calculations for Single Storey Extension

Expert Structural Calculations for Your Single Storey Extension

ProStructural Design provides the full structural engineering package required for your new ground floor extension. From the foundations up to the roof structure, our detailed calculations and construction drawings ensure your project is safe, meets UK Building Regulations, and achieves fast approval from Building Control.

⚙ What’s Included in Our Extension Calculation Package?

Our comprehensive pack ensures structural integrity and simplifies the build process for your contractor. It includes all calculations for the key components:

• Foundations: Calculation for new strip, raft, or piled foundations based on soil conditions and structural load.
• Superstructure Elements: Design of internal columns, wall plate supports, and critical masonry elements.
• Roof Structure: Calculation for timber or steelwork rafters, beams, and joists to support the roof load (flat or pitched).
• Opening Supports: RSJ calculations for any steel beams needed where the new extension opens into the existing house (e.g., knocking through a rear wall).
• Full Report and Drawings: A complete, professional report and clear, dimensioned drawings for your builder and Building Control submission.

★ Why Use a Structural Engineer for a Single Storey Extension?

Even small extensions require professional structural checks to guarantee safety and compliance:

• Building Regulation Compliance: The local council will request full structural calculations to approve the work under Part A (Structure).
• Load Transfer: We calculate the loads coming down from the existing house's roof/walls and ensure the new foundations can safely carry the weight.
• Protecting Your Property: Our design prevents settlement, cracking, and potential structural failure caused by inadequate foundations or insufficient opening supports.
• Fixed-Fee Peace of Mind: We provide an upfront, fixed quote based on your architectural plans, so there are no surprises.

Working with Your Architect and Builder

We believe in collaboration. We work closely with your appointed architect to seamlessly integrate the structural design into their plans. Our drawings are practical, easy to read, and prepared to minimise confusion for your builder, speeding up the construction phase.

Our Simple 3-Step Process for Extensions

1. Submit Plans: Send us the architectural drawings or sketches for your single-storey extension.
2. Fixed Quote & Design: We provide a transparent quote, and upon instruction, we complete the full structural analysis.
3. Receive Pack: We deliver the complete, Structural calculation report and detailed drawings, ready for your Building Control application.