what s a good price for plastering a stairs to cover artex?

impossible to answer without knowing the area ...also how thick is the artex? can it just be skimmed over or does it need a bonding coat ? get a few local plasterers on this site to come and take a look ?? .all the best

do you mean landing? hallway? what size?

same again without seeing the artex and area its very hard to give a price and whether u want it to be boarded over and skimed or bonded out and skimed then the price could change let me no the size of area and i will be able to help u out thanks