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.
Find a Trade Professional
Use our partner directories from RIBA, FMB, or RTPI to find an architect, builder or planning consultant to help with your project or development.
Find a trade professional (https://www.planningportal.co.uk/planning/planning-applications/find-a-trade-professional)Find a trade professional
Make an application (https://1app.planningportal.co.uk/)Make an application
Project estimating service (https://www.planningportal.co.uk/permission/home-improvement/estimating-service)Project estimating service
Planning consultancy calculator (https://www.planningportal.co.uk/permission/home-improvement/planning-consultancy-calculator)Planning consultancy calculator
Financing your project (https://www.planningportal.co.uk/permission/home-improvement/quick-quote-finance-calculator)Financing your project