An ADU in Las Vegas is functionally the same as a casita and follows the same pricing structure. A garage conversion ADU is typically the least expensive option at $80,000 to $150,000 because it reuses the existing structure. An attached ADU addition to the main home is next at $150,000 to $300,000. A detached ADU with new foundation, standalone utilities, and full framing starts around $200,000 for a stock plan and $350,000 or more for a fully custom design.
By Kingdom & Co.|2026-08-25T14:22:02-07:00August 21, 2026|Best Casita Builders in Las Vegas 2026|Comments Off on How much does it cost to build an ADU in Las Vegas?
About the Author: Kingdom & Co.
Kingdom & Co. is an award-winning luxury design-build firm in Las Vegas, handling custom homes, whole-home remodels, casitas, and focused single-room Small Luxuries projects under one roof. The team brings a collective 30 years of design and construction experience and is a back-to-back NARI Remodeler of the Year winner (2025 and 2026), an Architectural Digest AD Pro Directory member, and a 2025 Best of Las Vegas Gold winner for Best Custom Home Builder. Kingdom & Co. holds Nevada contractor licenses #0091618 and #0091629 and maintains an A+ rating with the Better Business Bureau. Learn more about the team at kingdomandco.com/about-us.
