help!!how much to lay slate floor tiles to 570sqm??!!

[Leatherface]

base it on m2 in my opinion matey. £25-30 should be about right as its such a big area you could afford to drop a little maybe, make sure you get it.

Nice job, where you based? As Alex1963 said you'll struggle with that time frame i reckon so you'll need some help!

You are having a laugh mate - at £25 to £30 per metre or drop a little ?

£30 would be my bare minimum plus materials !

Regardless of area they still need -
1 - Grading to thickness ( dependant on quality of slate ) Most is not graded prior to supply. With that area you could easily have a weeks work by yourself sorting them out.
2. Cleaning and sealing - and grouting and cleaning off and sealing again - this could take half as much time again as you took to lay them.

Base your quote on 3 sq m per bag coverage for your adhesive to take into account bedding up for any thin tiles.

Good luck.

Get a young lad to mix and labour for you for minimum wage !!