In new construction if it is a spec house the builder usually doesn't give a damn and the tile goes directly on the concrete making the carpet higher than the tile.
With contract builds these elevation issues are usually discussed with the home owner. There are many variables.
There is a product named Schluter DITRA. DITRA is basically an isolation product that separates the concrete from the tile installation and allows the concrete and tile to move at different rates without issue. DITRA comes in two thicknesses: 1/8" and 5/16".
Most regular tile is about 5/16" or thicker so it depends on what tile you choose but the 5/16" DITRA should work in your case.
Schluter also makes a metal tile edging for use when transitioning between tile and other floor coverings. The tile edging must be installed when installing the tile.