
As long as Slabs are laid properly on a bed of sand and cement mix they will stay put (on top of 3" hardcore!!!!)
Gravel would be the cheapest. I put £50/ ton bulk bags, but as you would need about 16 ton then you could get bulk discount if tipped loose. Depending on where you are depends on the cost. xx
If I have my sums right :- Using approximate measurements of 3' = 1m
13 x10 = 133 meters squared
17x 4.5 = 76.5 meters squared
Total 210 meters squared.
A large area to do anything with.
If the flat area is 76.5 meters Square you would have to lay approximatly 212number 2'x 2' Slabs!!!!!
Which would also mean digging out 6" and getting rid of the soil, importing 6 ton limestone, 3 ton Sharp Sand and about 15 bags cement to do the job properly!!!!
Your cheapest option would be gravel. You can get angular, flat, Round (I wouldnt use round as that moves alot!!!!) Flat gravel is nicest on the feet.
Chippings, unless you have a quarry around you that quarry them and can deliver loose will be alot mor expensive as mainly come in bulk bags or priced high because of transport costs (you cant get chippings around here for less than £50 a ton and that is at our price not retail price!!!!)
Price up for concrete, ring builders. Can a concrete mixer lorry get near it, well close enough to get a pipe round??? If not it will have to be hand mixed. And again you will have to dig out 6-8" remove soil. import limestone and concrete 4" on top. If anyone suggests just concreting ontop of the soil, donnot touch with a barge pole!!!!!
Also you vave to make sure it runs away from the house, otherwise you will get damp in the house.
HTH
Lea :) :)