How To Avoid Structural Issues In Home Extensions with Sam Dean | 118

About this episode

Jon Clayton interviews structural engineer Sam Dean about avoiding structural issues in home extensions.

Architecture Business Club host Jon Clayton interviews structural engineer Sam Dean of Porthouse Dean about common structural design pitfalls in home extensions and how to avoid spiraling costs. They discuss ground conditions as a major uncertainty (especially clay), the influence of nearby large trees and desiccation, and the use of low-cost desktop geological reports based on British Geological Survey borehole data to flag risk. They cover ceiling downstands and why beam position is often a cost-and-aesthetics decision between homeowner, architect, and builder, with installation complexity increasing when first-floor joists run into the beam. Sam explains cantilever “rules of thumb” and how corner bifold-door cantilevers can drive up steel and foundation demands, sometimes requiring columns and large foundations due to uplift forces. They address adding an extra storey and the case for trial holes. They also highlight risks of building onto existing, undocumented steelwork from previous extensions, which can force intrusive investigation or replacement when later loft conversions are planned. Sam explains how the architectural design can affect structural costs and outlines…

People in this episode

Host: Jon Clayton

Guest: Sam Dean

Topics covered

• structural engineering
• home extensions
• design pitfalls
• cost management
• geological reports
• architectural design

Keywords

• structural issues
• home extensions
• costs
• geological reports
• design pitfalls
• architectural design
• AI review service

Mentioned in this episode

Organizations: Porthouse Dean, British Geological Survey

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