ADU Floor Plans 400SF are a good start for an independent rental or a combo of guest house and home office. It can be built wheelchair accessible for older parents. What is possible in 400 square feet? It is truly versatile: ADU floor plans 400sf can be used as a guest house and home office, place for older parents or adult kids, or as a rare rental that can house a whole family.
Once you select a floor plan, you will find out within seconds if this ADU fits in your backyard and how much it may cost to build.
Choose from one of the 500+ pre-designed ADU plans
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Most often it is because of space constraints. When you are building an accessory dwelling unit, you should try to build as big of a unit as possible. Why? Because of the economics of the price per square foot. A lot of costs goes into utilities and site work. If you can spread this cost over more square feet, you gain more property appreciation.
There is additional side benefit: ADUs under 750 sf are not subject to impact fees in California saving you thousand of dollars.
The pandemic has brought in a sense of insecurity in the minds of all. This is more so in the minds of the older people. You may have to accommodate your parents or in-laws who want to have you near them. Believe it or not, smaller spaces are more comfortable for older people than sprawling mansions. This floor plan is just enough.
Yes. You can opt for a loft. ADUs can be as high as 16 feet ( at least until the new legislation kick in and allows more). You can build a loft above the bedroom and bathroom, while still keeping higher ceilings in the living room for a more spacious feel.
Did you know that 400SF ADU floor plans can arrive as a kit home? Some of our plans are available as kit homes across the States – with site specific engineering to account for local climate and other local characteristics. This floor plan represents a 400-square-foot Accessory Dwelling Unit (ADU) that offers a cozy and functional living space. It is designed for compact and comfortable living, perfect for individuals or couples. It features a bedroom, a bathroom, a combined living and dining area, and a small kitchenette. The layout efficiently uses space, ensuring all necessary amenities are included while maintaining a modern and cozy feel.
The front entrance to the ADU leads directly into the living room. Outside the entrance is a small wooden deck with seating, providing a pleasant outdoor area for relaxation or entertaining guests.
Living and Dining Area
The living and dining area is cozy and inviting, with a comfortable sofa and a table.
The front portion of the ADU features a welcoming living room. Furnished with a sofa and a small coffee table, this space is ideal for relaxing after work. A large window allows natural light to flood the area, enhancing the sense of openness and brightness.
The open layout allows for easy movement and interaction. Large windows bring ample natural light, adding to the room’s brightness and warmth.
Kitchenette
Adjacent to the living room, the kitchenette is compact yet practical.
The kitchenette is well-equipped with essential appliances, including a sink, stovetop, and storage cabinets. It is conveniently located adjacent to the living area, allowing a seamless transition between cooking and dining. The efficient design ensures that meal preparation is easy and enjoyable. All necessary kitchen functions are within easy reach, making meal preparation and light cooking convenient.
Bedroom
The bedroom provides a peaceful retreat with a comfortable queen-size bed. Large windows allow plenty of natural light, creating a bright, airy atmosphere. The minimalist design ensures a clutter-free environment, perfect for rest and relaxation.
It accommodates a wardrobe for additional storage. The bedroom is designed to be a peaceful and comfortable space, with windows on two walls to create a serene ambiance.
Bathroom
The bathroom maximizes space while providing all necessary amenities. It is accessible from the living area for guests and close enough to the bedroom for residents. It features a modern shower, toilet, and vanity with storage. The stylish fixtures and tiled finishes add a touch of luxury to this practical space while ensuring comfort and functionality. You may notice the corner utility room for the water heater with outside access.
Additional Features
Natural Light: Large windows in the living area and bedroom ensure the space is well-lit and open, creating a bright and airy atmosphere throughout the unit.
Efficient Layout: The open-plan design connects the living, dining, and kitchen areas, maximizing the use of space and providing a comfortable living environment.
Modern Design: Clean lines, modern furniture, and a neutral color palette create a contemporary and stylish living space.
Outdoor Space: A small deck area outside the main entrance provides additional space for relaxation and enjoying the outdoors. This is ideal for a compact yet comfortable living, combining modern design and functionality.
Flooring: The unit features wood flooring in the living room and bedroom, adding warmth and comfort to the interior. The bathroom has tiled flooring, which is practical and easy to maintain.
Storage: The unit includes various storage options, such as a bedroom wardrobe and kitchen cabinets, helping keep the space organized and clutter-free.
This ADU floor plan is designed to provide a balanced combination of functionality and comfort within a compact space. The thoughtful layout ensures that all essential living areas are well-defined and efficiently organized, making it an ideal option for a mother-in-law suite, guest house, or rental unit. Using natural light and practical storage solutions further enhances the livability of this cozy dwelling.
Have an old vacant car garage? Let’s bring it into handy! This charming and efficient mother-in-law suite layout cleverly makes use of a single car garage—and transforms it into a mini home. This plan has a loft above the bathroom and kitchen space. This ADU sits in the backyard of a Tudor style main house, so ADU is matching its exterior look.
All three main spaces are combined into one large open space. The living room and kitchenette are both fully open and parallel to each other. The bedroom, however, is slightly segregated within this floor plan. We especially love the alcove seating—perfect to transform into a reading nook (or used for any other hobbies).
The bathroom is the only space that is separated from the open floor plan. It is equipped with all amenities—and also makes room for storage!
Did you know that you can add 150 sq ft to the old garage even if the grandfathered garage sits closer to property lines than 4 feet? The new part will need to keep the new setbacks, but you get more space for your family or rental.
There is a number of pre-designed floor plans in our library – we have I shaped ADU, L shaped ADU and more.
Most ADUs under 400 sf boast one bedroom and one bathroom, but we can adapt floor plans to your requirements if you need a bigger studio with a bathroom.
Every thousand dollars matters when you look at an ADU as an investment into your property. This is why we try to save you money with pre-designed plans. We can customize any of our ADU floor plans 400SF to fit your property or to address your family needs.
