i have an area of 2.4 x 4.4 at 300mm height above the ground to build a deck what is the minimum for post hole depth to be dug or the formula please
Solved! See most helpful response
General rule of thumb is 1/3 to 1/2 the length and the width to be 3X the post.
A lot depends on what your soil type is, I tend to go at least 300mm for post depth to be on the safe side.
Welcome to the Bunnings Workshop community. Thank you for joining us and sharing your question about post-hole depth for your deck.
It's great that you've received excellent advice from @Brad. I totally agree with his suggestion of at least 1/2 the length or more. I subscribe to over-engineering and would probably go past the 300mm as well for safety. Would it be possible for you to post a photo of your plan? It would give us an idea of the layout and provide you with a comprehensive recommendation. It sounds like a fantastic project, any updates you can provide while building the deck would be much appreciated.
If you need more advice or information, please let us know.