How is the foundation prepared?
Written by Clayton Bielby
Updated at April 5th, 2025
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Expandify homes are installed on steel stumps using a prefabricated footing system (BMSA kit).
Foundation preparation includes:
A levelled site with a maximum slope of 200mm over 5m
BMSA steel stumps and bearers for a raised subfloor
Engineering specific to your soil type (H1 standard; upgrades for H2, M, P)
For DIY Kits, Expandify supplies the BMSA kit, but the customer must install it according to provided engineering. For Complete Packages, foundation installation is handled by the builder.