Custom casita construction in the Las Vegas Valley currently runs from about $250 per square foot at the entry level to $500 per square foot or more for luxury-finish builds (industry data, 2025). For a typical 1,200-square-foot detached casita built to luxury standards, total project cost usually falls between $400,000 and $600,000+, including design, permits, site work, and finishes. As a rough guide:
- 500 sq ft casita: $150,000 – $300,000
- 800 sq ft casita: $240,000 – $480,000
- 1,200 sq ft casita (Henderson’s max for a detached ADU): $360,000 – $720,000
- Room addition: $300 – $500 per square foot of added space
- Second-story addition: $400 – $700 per square foot of added space
Final pricing depends on lot conditions, finish level, HOA requirements, and design complexity, and these ranges shift with the market. Every Kingdom & Co. project starts with a free in-home consultation where we develop a realistic budget for your specific scope and lot before any design work begins.
Reviewed by Brian Horner, Head of Construction, Kingdom & Co. Last reviewed June 2026.
