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I had loads of quotes from people that will come and do the whole thing and they were all £1500+
What I'm doing now is using a landscape gardener to do the labouring (he's done loads before) and organising all the other shit myself.
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I'm sure you've done a better job of vetting/knowing your shit than I did, but just want to say you can't have too many stakes to support the shuttering. Not fun cutting bulged concrete to be straight straight.
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I had loads of quotes from people that will come and do the whole thing and they were all £1500+
The work itself is pretty straightforward but if it goes wrong it can be costly to put right. Worst case scenario requiring everything ripping out and starting again. Because of the cost associated with putting right fuck ups margins tend to be quite high so that this can be swallowed when it does happen.
From what you've described it's straightforward, are you using mesh to re-enforce? Depending on the depth of the slab, I'd recommend hiring a poker it makes for a stronger slab as it chases out air bubbles, pushes the 'fat' (mortar) to the surface making floating it easier as well as being a great help moving the muck around and levelling it - just don't let the tip rest against the shutters for too long as it can cause them to blow.
Hovis
Bobbo
My 9'x7' slab I got about 5 years ago was £600 all in, so that doesn't sound too bad.