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Foundation solutions for home extensions

Get your extension project off on the right footing with Tim Doherty’s in-depth guide
This extension project features deep basement foundations

So you’ve got a great design in the bag and you’re keen to crack on with your extension. First things first: you need to decide how to build it, and that process starts with the foundations. Specifically, you need to understand what supports the existing house. This will have a major impact on the design of the new footings. Combine this with knowledge of soil conditions, trees, service/drain locations and more, and your team can plan the best solution for your project.

Typical existing foundations

The long hot summer of 1976 heralded a turning point in foundation design. Following a significant flurry of claims for subsidence, insurance companies insisted they were cast deeper to help stabilise new and replacement dwellings. Before that, houses built in the 1930s to 1970s may have had foundations little more than 600- 800mm in depth and the Victorian / Edwardian periods frequently only went to depths of just 450-500mm.

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About Build It

Plan, design and build your dream home with practical advice and inspiration from Build It magazine. Highlights in this month's issue include: - Design Secrets to Win Over the Planners - Home Extension Costs - How to Find a Project with Renovation Potential - Building Contracts: Why You Need One - Buyer's Guide to Sliding Doors - Outdoor Living Ideas - Build It magazine's own Real Life Self Build ... and more!