Foundations are dug now how do I put the stakes in level?

Keep it simple. Spirit level and straight edge. Set depth at highest point and work away. Make sure you flip the level over for each peg.
 
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I always use this https://www.buyaparcel.com/p/dewalt...d-hard-case/?gclid=CN6h-ZS40ssCFdS7GwodRBQKNA

You only have to be 2mm out at each peg and it can quickly turn into 20mm at the other end. Personally I'd never pour without a laser, I'm not a fan of cutting splits.

Edit: I know you can make up 20mm on your beds, but in the context of a biggish extension, it could end up being a lot more using only a spirit level.
 
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I always use this https://www.buyaparcel.com/p/dewalt...d-hard-case/?gclid=CN6h-ZS40ssCFdS7GwodRBQKNA

You only have to be 2mm out at each peg and it can quickly turn into 20mm at the other end. Personally I'd never pour without a laser, I'm not a fan of cutting splits.

Edit: I know you can make up 20mm on your beds, but in the context of a biggish extension, it could end up being a lot more using only a spirit level.
Level and straight edge will get you within 4 or 5mm over 8 or 10 pegs, which is about the same as an average low end laser.
 
It looks like it's going to rain this weekend. When you have a couple of inches of rain in the bottom of the trench, use that as a level and measure up from the surface of the water. Job done :) :)
 
Right well I have just finished off putting the stakes in and what a job that ended up being. I used a long spirit level. First I started off on the left side at the front end of the garage where the trench meets the drive, this looked like the lowest point. But by the time I'd got round the other side the 300mm had turned into about 200mm because it turns out the garden is on a slope from right to left in the pics.

So I decided to start again from the highest point which was the right side and then worked back round which did mean that the left side of the trench is going to be filled quite allot with concrete as to be level with the other side but I figured it's better to have too much on one side than not enough. But the stakes are definitely all level. No pics as it was dark when I was finished. Hopefully I can get the concrete in Tommorow.
 
Got the concrete in today, it used a hell of allot more than it should of done because of the trench being 'slightly' bigger in places, think he said it was just under 6cubic metres worth! I paid £420 all in and they levelled it for me too using my new spirit level.
Some pics:












The guys were dead helpful and barrowed it all up the driveway which has a slight hill on it too!
 
Not sure yet, need to do abit of research and price the blocks up etc..

One of my mates is saying do it in breeze blocks but I'm not a fan and so I think concrete blocks will be much better and stronger
 
But are they not allot lighter than normal blocks? And easy to break?

What would you recommend then? I know you need the dense 7n blocks up to dpc
 
True breeze aren't made these days (made from coke breeze), but there are various types of block available, some are lighter than others.
 
Most people say breeze but mean concrete. The other type is the lightweight "thermalite" block, which is a generic term that people commonly use for aerated blocks.

You have not got much ground cover there for blocks below DPC, by the look of things, so they will show.

But you don't need 7N blocks. 3N will do. Thermalite won't be any good that near to the surface of the ground though.
 

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