$400,000 is enough to build a Custom new home in Las Vegas at the smaller end of the size range. Custom new build pricing in Las Vegas is $400 to $600 per square foot, so a $400,000 budget could deliver a Custom home of approximately 700 to 1,000 finished square feet — enough for a small casita, a guest house, or a compact primary residence on a lot you already own. It is not enough for a family-size (3,000+ sq ft) fully custom home, which typically starts at $1.2 million to $1.8 million at Custom tier.