4 Bedroom ADU Plans

View 4 bedroom ADU floor plans and pricing. Browse accessory dwelling unit designs for four bedrooms under 1200 sqft with 4BR. Customize any floor plan to suit your needs, or start on a custom 4BR floor plan with our designers.

Size of unit
Min/max sqft size
0 sq. ft.
1200 sq. ft.
Number of bedrooms
Number of baths

Vertical Build Price Cost for unit & finishes. Your project will also require plans, permits, & sitework. Contact us for a free consult & property-specific estimate.


Other Features We can also add features to any of our plans to create something more custom for you. Contact us to let us know what you envision.

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Featured 4BR project

Four Bedroom in Vista

4 Bed • 3 Bath • 1,200 ft2

Parents looking to bring their two children closer designed and built a 4 bedroom and 3 bath 1200 sqft ADU. With abundant space on their property, the family opted to build the largest ADU possible. This beautiful poolside unit is the perfect home for a growing family!

Basics of 4 Bedroom ADU Plans

Accessory Dwelling Units (ADUs), also known as granny flats or in-law suites, have become a sought-after housing option in recent years. Among the various configurations, 4 Bedroom (4BR) ADU plans are particularly appealing due to their expansive layout and versatility. These standalone living spaces, located on the same lot as a single-family or multifamily home, typically comprise four bedrooms, a living area, a kitchen, and a bathroom. This layout provides substantial space, making it an ideal choice for larger families, groups of renters, or guests.

The charm of 4BR ADUs lies in their ability to offer a balance of privacy and proximity to the main house. They can serve a wide range of purposes, from accommodating extended family members to generating significant rental income, making them a multifaceted and valuable asset to any property. The design of 4BR ADUs can be tailored to mirror the aesthetic of the main house or to meet the unique needs of the occupants, making them a truly customizable and practical housing solution.

Floor Plan 4BR 3BA 1199 SF 41x30 LONG Snap ADU 3D View

4BR ADU Sizes

When planning a 4 Bedroom Accessory Dwelling Unit (ADU), understanding the size parameters is essential. In California, the law allows for an ADU of up to 1200 sqft on most residential properties, subject to a 4′ setback on the sides and rear.

The size of a four-bedroom ADU can be tailored based on your specific needs and preferences. The minimum square footage for a functional four-bedroom ADU is typically around 1100 sqft, though SnapADU would suggest taking the full 1200 sqft if you’d like four bedrooms.

A two-story plan can take advantage of views and fit into tight footprints. A 1200 sqft 4BR plan provides ample living space, making it an excellent choice for those seeking to house a family or perhaps students in a college area. Always remember to consider cost factors when planning your 4BR ADU to ensure it aligns with your goals and budget. How to find an ADU contractor.