Studio Detached ADU – 440 sq. ft.

BR0-BA1-440

  • Studio 1 bath ADU

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Plan Details


  • Size: 440 sq. ft.

  • Model: BR0-BA1-440

  • Layout: Studio + 1 bathroom, detached single-story


  • Shape: Square (21' x 21')

Functional Studio + 1 Bathroom Layout


The BR0-BA1-440 maximizes its 21' x 21' square footprint with an open design:

  • Studio Living Space – A combined 20' x 15'-5" area that functions as a bedroom, living room, and flex space.

  • Bathroom – A full-sized bathroom with modern finishes, easily accessible from the shared space.


  • Kitchen – Positioned along one wall, offering efficiency and options for upgrades.

At Pacific Sands, we know many homeowners are looking for a simple, open, and flexible ADU design. The BR0-BA1-440 Model is our only studio floor plan, offering a 440 sq. ft. detached ADU with a modern, hotel-inspired layout that feels bigger than its compact size.


This plan is perfect for mid-term rentals, guest units, or multipurpose living spaces such as a home office, gym, or creative studio.

Key Features


  • True Studio Design

  • Open-concept space ideal for a variety of uses: rental, office, gym, or guest suite.

  • Option to add a Murphy Bed for sleeping flexibility without sacrificing floor space.

  • Surprisingly includes three closets—a rare storage solution for a compact ADU.

  • Efficient Square Shape

  • Compact 21' x 21' layout ensures functional flow without wasted space.

  • Designed for entertaining with a combined living/kitchen area.

  • Straight Line Kitchen Layout

  • All appliances aligned on one wall for ease of use.

  • Spacious 12'4" x 7' layout allows room for cooking and dining prep.

  • Optional peninsula or small island upgrade for extra storage and seating.

  • Full Bathroom

  • Private, modern bathroom with shower/tub combo and quartz vanity.

Integrated shelving and practical finishes included.

Benefits for Homeowners


  • Rental-Ready – Mimics a modern hotel room layout, making it perfect for mid-term rental markets (Airbnb, VRBO, Zillow).

  • Flexible Use – Works equally well as a long-term rental, family extension, office, or personal retreat.

  • Affordable & Compact – Lower construction and maintenance costs with maximum functionality.

  • Market Appeal – Studio layouts are in demand for renters and flexible-use buyers.


  • Smart Storage – With three closets, this studio offers more storage than most ADUs of similar size.

Why Choose the BR0-BA1-440 Model?


The BR0-BA1-440 Detached ADU is perfect for homeowners who want a highly versatile, compact unit that appeals to both renters and personal use. Its open studio layout, combined with thoughtful storage, modern finishes, and a full kitchen + bathroom, makes it one of the most functional sub-500 sq. ft. designs available.



At Pacific Sands, we also provide permitting support and design customization, ensuring the BR0-BA1-440 aligns with your goals and property.