Hi Irene and Kyle
Let's say the tile is a simple ceramic tile 8x10 or so,and he'll be removing the old panels and tile and install cement backer board...I'd guess about $1200.That would include the backer board,thinset mortar,grout,etc and labour and removal of waste.
It's hard for me to guess at it from here,but if it is a straightforward installation without surprises,I would think that's a fair price.