How Deep Do Foundations Need To Be For An Extension?

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Published 2023-01-20

How deep does your foundation need to be? I'll explain how deep the typical foundation should be for your house extension. You'll need to consider the soil type, how deep nearby drains are and most critically how far away trees are from your proposed foundations. Generally, if nothing influences the depth required your foundations should be 1m deep from ground level. This is a general guide and you should always consult your building control provider to establish what they'll except as all foundations are different.

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All Comments (7)

@marinabatool3010 3 months ago

Ben you are a GEM 💎...thank you very much for sharing all these useful information....made my concepts clear....I am very thankful to you. ✨️
@fredbloggs4829 1 year ago

Cool video. Looking forward to the tree video because 25m seems quite a distance. As a question, does it matter if the tree is at a lower level that the foundation. I mean do tree roots grow uphill?
@davidgray7204 1 year ago

Hi Ben can you build an outside brickwork skin to a house thats built with 9in solid concrete blocks in order to create a standard construction property.
@abdulwadud363 1 month ago

Hi, I've just started digging for a foundation for a double storey extension and it's full of sand. Are you saying that's good? The sand isn't stable and keeps breaking the trench.
@slimbrammers6224 10 months ago

Sod the construction advice, how do you look so you after 20 years in the trade lol
@jamesdiver2183 4 months ago

How did you become a building inspector? what qualifications do you need? I have poor health and need to get of the tools soon, is this something a 50 year old joiner could get into. TIA