Thanks for the reply Andreas. And do per m2 prices include adhesive and grout etc or is that on top? One other thing, prep work, removing old tiles,laying self levelling compound etc if on a floor, I notice people tend to charge day rate for this. Let's just say its one day in prep work for example, am I right in thinking it would be charge at let's just say 150 for that day, then charge the rest of the job at the m2 rate as normal? For instance, 150 prep, 10m2 at 30 per m2, 300 + 150 so 450 all in?Jobs with natural stone products simply require more time to lay and finish, all the cuts have to be done on wet cutter , they also need cleaning and sealing . In general thicker material involves more fitting time due to slower cutting process.