How much does it cost per sqft to hold floor and wall tiles installed? how much is fair to pay envelope for about 250 sqft including...

how much is fair to pay envelope for about 250 sqft including both walls and floors (75 sqft floor) ??? include underlayment please (labor but not substance cost)!
Answers:    We used craigs list to find a man to tile our kitchen floors/back hallway/2 bathroom floors/kitchen backsplash and tile the walls bringing up the rear the bath tub. There be ALOT of cutting involved as we choose 18x18 inch travertine tiles for the flooring and 12x12 within the bathroom. All together I would say it be probably 500+ sq feet of tile, he did the underlayment, layed the tiles, and grouted the entire project for $2000. So I would vote it was in the order of $4 a sq foot.

On a second note we have someone else quote us $1000 just to tile the tub surround area. . . .
In Ottawa $ 4.00 per SQ ft for floors, $3.00 per SQ FT for walls You suppy adjectives material