In real estate, almost everything is negotiable, so it is certainly worth a try. Now, this does not mean the builder will fall down and roll over. It is very common for builders to claim that their prices are based on fixed construction costs. Perhaps, but timing is everything.
A builder is more likely to be flexible on price at the very beginning and end of a project. Early on, most developers want to move people in quickly so the project builds momentum. In the end, they may be more inclined to accept lower offers when only a few units are left.
If you are unable to negotiate on price, negotiate for a better lot location or amenities, such as a carpet upgrade or light fixtures. A developer will rarely pass up a deal over a few hundred dollars’ worth of carpeting.