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I had mine pumped from the street to the back of my garden, the line was about 50m. They moaned about the length when they got here, I think above 50m and they start to charge extra.
Mine was 6m x 4m, 150mm thick. Your size I'd be tempted to DIY it if you have the time.
For the sake of £25 or so for a sheet of steel mesh, I'd be tempted to chuck one in, it really does strengthen the concrete and helps prevent cracking
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I've mixed concrete before, but only as a labourer or kid when I had someone who knew what they were doing to say "more of this/that" or just "that looks about right". I think my main concern would just be getting the mix wrong and having to pay more to get it lifted and relaid. I may go with the clearing and shuttering myself so then I can give more definite specs to a builder or local landscaper. I'll ask my builder if he does that kind of thing when he's next here.
More not gardening.
I'll (hopefully) soon need to think about shed footings. I will maybe need a 17'x9' slab poured. It will be about 100' from the road but we do have access down the side of the house. Can concrete be pumped that far or would it be better just to get someone with a mixer in to do it on site? I don't have the time nor the inclination to be spending all day mixing and pouring myself. Wondering where the tipping point is in terms of cost for pumped vs labour.
Also, if it's for a shed, is it worth chucking rebar in or would a plain slab be OK? My last shed was only 8'x6' and sat on 9'x7'x6" of unreinforced concrete for 5 years with no issues.