200 sq ft
Studio
1 Bath
Single Story ADU Plans – Functional, Beautiful, and California-Ready
Building a single story ADU is one of the most versatile ways to add living space and long-term value to your property. Whether your goal is to house family members, create a rental income stream, or simply expand your home’s usable space, one story ADU designs provide a perfect balance of simplicity, comfort, and affordability.
At Ataman Studio, we specialize in designing single story ADU floor plans that are carefully adapted to your property’s unique conditions and fully compliant with local zoning and building codes. Our expert team creates layouts that make the most of every square foot while providing open, light-filled spaces that feel like a natural extension of your home.
Why Homeowners Choose Single Story ADUs
One story ADUs are the most common and sought-after type of accessory dwelling unit for good reason. They offer a single-level layout that is easy to access, cost-efficient to build, and flexible enough to suit a wide range of uses.
For homeowners with aging parents, a single level ADU provides a safe, step-free living environment that allows loved ones to stay close while maintaining privacy. For investors, single-story ADUs make excellent rental units since they are quick to construct and appeal to a wide demographic — from traveling nurses and students to retirees.
Another advantage is design freedom. A one-story unit can be configured as a compact studio for efficiency or as a spacious two-bedroom plan with a full kitchen, living room, and even a private patio. The layout can be rectangular for a small lot, L-shaped for additional privacy, or open-concept for a modern feel.
Design Ideas for One Story ADU Floor Plans
When it comes to single level ADU layouts, there are nearly endless possibilities. Here are some popular configurations our clients choose:
- Studio ADU Plans – Perfect for smaller lots, featuring a combined living/sleeping space, kitchenette, and full bathroom.
- One-Bedroom ADUs – Ideal for long-term rentals or guest houses, with a separate bedroom and open living area.
- Two-Bedroom ADUs – Provide flexibility for families or roommates, with additional storage and full kitchens.
- Detached ADUs with Outdoor Living – Units that open to patios or decks, extending the living space and creating a private retreat.
Our designers also recommend adding energy-efficient windows, skylights, and sliding doors to make your ADU feel larger and bring in natural light.
Our Step-by-Step Design & Permit Process
Designing a single story ADU floor plan is more than simply selecting a pre-made drawing. Our process is tailored to your property, budget, and long-term goals to ensure that your ADU project is smooth from start to finish.
- Initial Consultation & Site Assessment
We begin with a site visit (or remote evaluation if preferred) to review your property’s layout, garage placement (if converting), or open yard space. We identify potential utility connections, setbacks, and access points, ensuring that the ADU can be positioned for maximum usability. - In-Depth Zoning & Code Research
Before we draw a single line, our team researches local ordinances, including maximum square footage, height restrictions, parking requirements, and fire safety setbacks. This step is critical to avoid costly redesigns or delays. - Custom Design & Layout Options
We then create several one story ADU design concepts so you can choose the configuration that best matches your needs. Whether you prefer an open floor plan with vaulted ceilings or a more traditional divided layout, we design with functionality and comfort in mind. - 3D Visualization & Refinements
Our team prepares 3D models and renderings to help you visualize the space before construction. You can walk through virtual rooms, see window placements, and adjust finishes until the design feels perfect. - Complete Permit-Ready Drawings
We produce a full set of architectural drawings and structural plans, including floor plans, elevations, and construction details. Our permit team then submits them to the city, tracks the approval process, and responds to any plan check comments on your behalf. - Construction Support
Once permits are approved, we remain involved to help coordinate with your builder, answer technical questions, and ensure the project is built to plan.
Design Ideas for One Story ADU Floor Plans
When it comes to single level ADU layouts, there are nearly endless possibilities. Here are some popular configurations our clients choose:
- Studio ADU Plans – Perfect for smaller lots, featuring a combined living/sleeping space, kitchenette, and full bathroom.
- One-Bedroom ADUs – Ideal for long-term rentals or guest houses, with a separate bedroom and open living area.
- Two-Bedroom ADUs – Provide flexibility for families or roommates, with additional storage and full kitchens.
- Detached ADUs with Outdoor Living – Units that open to patios or decks, extending the living space and creating a private retreat.
Our designers also recommend adding energy-efficient windows, skylights, and sliding doors to make your ADU feel larger and bring in natural light.
Cost, Timing, and Value
One of the biggest advantages of single story ADUs is their cost efficiency compared to two-story units. Because there is no need for stairs, additional structural reinforcements, or complex framing, single-level ADUs can often be built faster and at a lower price point.
Typical design-to-permit timelines range from 3–5 months depending on city response times, while construction can take 4–7 months depending on size and finish level. Our team works hard to streamline approvals and get you building as soon as possible.
From a financial perspective, a one story ADU can dramatically increase your property’s value and provide a steady income stream if rented out. Many of our clients recover their construction costs within several years through rental income alone.
Start Your Single Story ADU Project
Ready to unlock the potential of your backyard? Ataman Studio offers full-service single story ADU design, drafting, and permitting for homeowners across California. Our experienced team guides you through every step — from concept design and code research to permit approval and construction support — so you can focus on enjoying your new space.
Whether you are planning a compact studio or a spacious two-bedroom ADU, we deliver designs that are beautiful, functional, and fully compliant with local regulations.