Concrete block pile foundation for shed - how to level?

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I am planning on building a couple of garden buildings, one 30sqm, and another smaller 'practice shed' that is around 9sqm.
Both are on a hill, the smaller building on a steeper bit of land than the larger one (which is flat-ish mostly).
Due to the location, materials have to be transported by hand, and I can't get anything delivered nearby.

For foundations, I decided to go with solid concrete block piers, as I can move each block by hand, and they are cheap.

As I am on a hill, each pier will be at a different depth/height.
I have spent far too long digging out and putting in blocks, only to then remove them to dig out more to try and get them level. I also realised that once I concrete them together, the more blocks I have, the taller the stack of blocks will be.

One option I have thought about is using the blocks to fill most of the larger holes, and then pour concrete around and over them to get a level starting point for each, then have one block on top to keep the building above the ground. (i.e. the blocks take up space in the hole and mean I don't have to fill with so much concrete). It sounds like it defeats the point of the blocks, but I already have them, and its easier than mixing a lot of concrete (and buying the materials to do so - not feasible to have bulk bags delivered)

Questions:

Are there any clever ways to make sure that once I dig down far enough to hit solid ground, and then build up the blocks (some places need 6, others 1), that they come out level at the top?

How do I handle the concrete between each block altering the finished height (i.e. 6 blocks will have concrete between each, and final height will end up higher than 2 blocks with one course of concrete)

No matter how well I level the blocks, I assume there is no way they will be perfect, what do I do between the blocks and the floor joists for any gaps?

Should I just go with concrete pads, and fill the large holes with the mostly blocks and then pour concrete?
 
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your pads shouldnt contain blocks.
set string lines out of the height you need to get to . pour the pads and use the blocks to get up to the height.
if it’s not perfect set your joists on steel packers.
 
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You can level them with flat roof tiles, bricks, or old wall tiles, pretty well anything which is impervious to moisture. Bed the blocks with concrete under them.
 
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Use a datum by each hole and measure down. Do a search.

But your mention of bricks, blocks, concrete sounds a bit bizarre. Just lay a normal wide pad in concrete and build a pier, or form a traditional stepped foundation.
 
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Use a datum by each hole and measure down. Do a search.

But your mention of bricks, blocks, concrete sounds a bit bizarre. Just lay a normal wide pad in concrete and build a pier, or form a traditional stepped foundation.

The plan was to put some concrete at the bottom and build up blocks.

My concerns were around the fact some of the holes have to be quite deep, and I was worrying too much about getting all the piers spot on level. Using steel packers mentioned earlier should solve it as long as i’m not too far off.
 

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