The Atrium
- 310 SQ FT
- 1 BED | 1 BATH
- Turnkey Construction From $120,000
A One-Bedroom ADU, Settled
A one-bedroom ADU shifts how a space gets used day to day. We at Oasis Builders see it on every project. Once there is a separate bedroom, the ADU stops feeling like an add-on and starts functioning like a true home. This one-bedroom ADU floor plan was developed for homeowners who want that sense of permanence without taking on unnecessary square footage.
We offer this one-bedroom ADU as a pre-approved option because the fundamentals already work. The layout passes review, supports everyday living, and leaves room for personal input. You can shape finishes and systems based on how you plan to use the space, and we help guide those decisions using experience from builds that continue to perform well years later.
If you’d like a closer look at the process, more detail is available on our approach as an ADU contractor.
ADU Build Details
Building Envelope
We think about the exterior of this ADU as the system that quietly supports everything inside. On the outside, we select materials that tolerate sun exposure and seasonal shifts without requiring frequent maintenance. To keep comfort consistent, we include a complete air sealing package that reduces energy loss and helps heating and cooling equipment operate efficiently instead of compensating for drafts or pressure loss.
For plumbing, we use PEX supply lines with a manifold configuration to deliver even water pressure across fixtures and reduce the chance of concealed leaks, which matters in a home designed for daily use.
Interior Finishes
Inside, our focus stays on how the space will feel after years of use. We want materials to remain comfortable, reliable, and visually beautiful long after move-in day. We use durable yet refined quartz or porcelain for countertops, engineered hardwood or resilient vinyl for flooring, solid-core interior doors, quality plumbing fixtures, and tile finishes in kitchens and bathrooms. The goal is an interior that continues to feel welcoming whether the ADU serves as a primary residence, a rental, or a long-term home for a family.
Optional Upgrades
If resources allow and you want to take this ADU one level higher, you can opt for advanced insulation, higher-grade window systems, or ducted mini-split heating and cooling. Other upgrades include solar readiness, EV-capable electrical infrastructure, smart security systems, and adaptable lighting. We also assist with exterior elements such as concrete paving or landscape design to create a cohesive indoor-outdoor connection.
YOU ASK WE ANSWER
The $120,000 starting price reflects the work required to build this ADU from the ground up. That includes architectural drawings for this specific plan, structural engineering, Title 24 energy compliance, and full construction of the ADU using our standard inclusions.
Our company coordinates the trades, manages the construction sequence, and oversees execution so the structure comes together as designed.
Permit fees, city plan checks, and finish selections such as appliances, flooring, tile, windows and doors, skylights, millwork, stone surfaces, and certain mechanical systems are not included in the base price.
By handling these items outside the base scope, you stay in control of where to invest and where to simplify. Nothing ever gets added later without discussion.
Starting with a pre-approved plan changes the pace of the project. Instead of spending months testing ideas and revising layouts, you begin with a design that already fits regulations and functions well in practice. This allows decisions to focus on comfort, finishes, and daily use rather than fundamental layout concerns.
The plan removes uncertainty at the front end and keeps the project moving with fewer interruptions and fewer redesigns.
Over the years, we at Oasis Builders Inc. have completed hundreds of successful projects and built long-term trust with clients who value straightforward communication as much as ethical construction practices.
We are licensed by the state and work with building codes and zoning requirements every day. Before construction starts, we explain the scope, the reasoning behind it, and the costs in clear terms. Throughout the build, we remain accessible and responsive, so you always know where the project stands.
