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Extensions

Building Regulations: Walls Below Ground Level

Depending whether the foundation for a new detached building has been cast as deep-fill or shallow-fill, there could be a small or large amount of wall construction needed below ground level (referred to as substructure), on which the above ground walls (referred to as superstructure) will be built. 

The principal requirement of the substructure is to ensure adequate support is provided to the superstructure. The substructure (bricks or blocks and mortar) should be effective and be resistant to frost and also to sulphates within the ground.




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      The Planning Portal is delivered by PortalPlanQuest Limited which is a joint venture between TerraQuest Solutions Limited and the Department for Levelling Up, Housing and Communities (DLUHC). All content © 2024 Planning Portal.