Building Small deck for timber cubby house on top

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Hey

I am going to build a deck that will be about 200mm off ground level and will be 2.5m x 2.5m

I have a few questions

I want to concrete some hardwood fence posts as the stumps

How deep in the ground should they go in?

I will put in 9 stumps. I will buy minimum quantity of sand and rock mix for concrete from the local nursery

How many bags of cement would be needed for 9 holes?

Then I will fix 3 long treated pine joists to the stumps. What size would be suitable?

I will do something similar to this video https://youtu.be/QTQeIZT4U-I

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