Posted: 12/11/2015 at 16:23
The ;uneven concrete' bit bothers me - that will make more work removing it and infilling the space if it is underpinned by bottoming. Presumably you intend to put grass in the space? . Make sure the quotes factor in the skip hire. Because of the concrete, not sure how you will be able to divide the job into 2 except one half is the clearing and levelling and the second half is laying the turf and the patio.
Finger in the air price would be about 1500 pounds but that is Scottish prices. Add skip hire and paving slabs on top maybe.