Posted: 31/05/2016 at 10:39
If you try and do half a job by covering the slate you'll find your lawn will struggle because of it. The roots will struggle to penetrate the slate and will dry out come summer creating a dead yellow awful mess and a complete waste of money.
What you could try doing is sticking a post up on gumtree asking if anyone wants free / cheap slate chippings: all they have to do is take them away themselves! Ask around with friends and family as well: there's a lot to be said for labour that can be brought with promises of a BBQ and drink when you're all finished and if it helps someone else finish their garden even better.
With regards to topsoil I had it delivered in one ton bags straight to my driveway from the local builders merchants. I just needed to wheelbarrow it into the back garden.You shouldn't struggle at all with getting it.
Now there are advantages and disadvantages to turf verses grass seeds. But with BOTH you wont be walking in it for at least a month while it establishes itself. Turf costs more but does create an instant effect and of course by covering the soil stops weeds establishing themselves. Remember with BOTH to choose a type of grass suitable for you: do you need it to be hardwearing for animals and children for instance? Seed is hugely cheaper but you do loose that instant effect.
Of course if you want an instant garden that you can walk on straight away with minimal fuss have you considered artificial turf? You wouldn't need to worry so much about the slate removal (no roots = no problem) and it can be fitted in a day. Maintenance is somewhat easier and it will always be ready for summer.