As of May 2026, a custom casita in Las Vegas typically costs between $350 and $450 per square foot all-in once permits, design, architecture, MP&Es, and site work are included. Smaller casitas (under 500 sf) cost more per foot because fixed costs like running a toilet drain line stay the same regardless of size. A 2,000 sf casita is usually significantly cheaper per foot than a 400 sf pool house. Exact pricing varies by lot conditions, finish level, and utility runs.