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is it a big (i.e. expensive) job
You don't give the other dimensions, so it's hard to know how much earth in total you'd be moving. But the short answer is probably, yes.
Obvious factors to me:
- how much soil do you have to remove? If there's a reasonable amount you need a skip, which adds up.
- how do you remove the soil from the site? - ie can a digger get access? - if not, then you're paying for people to dig with spades, which adds up. Can earth be wheelbarrowed away? - if not it's truggs through the house, which adds up.
- can the boarder walls/fences cope with the amount of earth being removed? If not, then you need to build retaining walls, which adds up.
- etc.
However, if it's a small garden and/or none of the issues above apply then I can image you could DIY or find labours to do it for a grand. Worth remembering that compacted soil is very compact. As soon as you dig it up its volume will increase so check any guestimates for skip requirements.
- how much soil do you have to remove? If there's a reasonable amount you need a skip, which adds up.
my garden slightly slopes up the way - the back is about 20/30 cm higher (roughly) than the bit by the house. is it a big (i.e. expensive) job to either level that out (by lowering the back by 20/30 cm) or create a lower section in the back? I'd quite like the back of the garden to be lower, to feel more secluded