Does foundation design differ for single vs double storey homes?

Yes, genuinely — a double storey home introduces significantly greater loads than a single storey equivalent, which your engineer accounts for through appropriately increased reinforcement, thickness, or foundation system choice.

This doesn’t necessarily mean a fundamentally different foundation type is needed — often the same general system (waffle slab, for instance) is used, just designed to a more robust specification suited to the higher loads.

If you’re planning a double storey home, or might add a second storey in future, telling your engineer this upfront ensures your foundation genuinely accounts for those loads from the start.

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