Water always coming out of my perimeter drain around my house
There is water in the ground, and the drain is moving the water to the gutter at the curbside. Your builder is correct, the drain is working.

The real question is: where is the groundwater coming from? Have you had a lot of rain lately? Are your neighbors running their sprinklers in the winter? It's also possible that your (or your neighbor's) potable water main is leaking. You also could be the lucky owner of a home that is built on or near a natural spring.

Did your builder do any sort of percolation test or evaluation of the ground water situation?