Ballpark Est. for TYile Install.

I am having 2 bathrooms (70 sq ft each), a kitchen (70sq ft) and an entryway (140 sq ft) tiled using marble tiles.

The subbase will be prepared by my carpenter using cement backer board.

The tiles are 8″ square.

So the project involves laying the tiles, and grouting and sealing them.

Does anyone have a estimate by sq ft for a quality tile installation?