The Vista
- 500 SQ FT
- 1 BED | 1 BATH
- Turnkey Construction From $120,000
A 500 sq ft ADU, Refined
A 500 sq ft ADU changes how people live. We see it every time we build one. This ADU is for homeowners who want that feeling of “home” in a compact footprint. We offer this pre-approved 500 sq ft ADU floor plan as a starting point. It already meets approval requirements, yet it leaves room for you to make it personal by shaping finishes and systems around how you plan to live in the space.
If you’d like a closer look at the process, more details are available on our ADU construction services page.
500 sq ft ADU Build Details
Building Envelope
This 500 sq ft ADU building envelope starts with the exterior choices that shape the home’s presence. Stucco forms a clean, modern finish, while optional siding creates a higher-end Scandinavian profile for homeowners who want a more refined look. A concrete landing pad can complete the entry and create a stable transition to the interior. Roofing selections include cool roof materials that strengthen energy performance or tile roofing that introduces a more sophisticated aesthetic. The envelope then moves inward to focus on comfort and efficiency. Advanced insulation, dual-pane Low-E windows, architectural exterior doors, and full air sealing work together to limit heat transfer and create quieter interior conditions. A 125–200 amp electrical panel supports modern appliances, smart upgrades, and long-term electrical capacity.
Interior Finishes
Interior finishes in The Vista reflect the character of a small private home rather than a micro-studio. Flooring often defines the first impression, and homeowners choose engineered hardwood for warmth or waterproof luxury vinyl for greater durability. Countertop selections include quartz, quartzite, or porcelain, and each option delivers reliable performance and low maintenance. Solid wood cabinetry with soft-close hardware supports daily use in the kitchen and bathroom. Plumbing fixtures from Brizo, Grohe, or Kohler add dependable quality throughout the unit. The lighting system meets Title 24 requirements and uses LED recessed and architectural fixtures to maintain clear, functional lighting in both the bedroom and main living area.
Optional Upgrades
Optional upgrades allow this 500 sq ft ADU to grow with your plans over time. Comfort-focused options such as advanced insulation, high-performance window systems, and ducted mini-split heating and cooling improve temperature consistency and can help reduce utility bills. Future-ready additions like solar preparation, EV-capable electrical service, smart security, and adaptable lighting help the space remain flexible as needs evolve. When needed, we can also help with exterior upgrades, from concrete landing pads to landscape design, so the ADU feels complete and well integrated with the property.
YOU ASK WE ANSWER

When we say this 500 sq ft ADU starts at $120,000, we mean the work required to physically bring this home into existence. That includes the architectural drawings for this specific layout, the structural engineering behind it, Title 24 energy compliance, and the full construction of the ADU itself using our standard inclusions. We coordinate the build, manage the trades, and carry the project through construction so the structure comes together as intended.
Designing a 500 sq ft ADU from scratch can feel open-ended in ways that slow projects down. A pre-approved plan changes that dynamic. You begin with something that already fits regulations, already makes sense spatially, and already has real-world experience behind it. Homeowners often tell us that this removes the mental weight from the early stages. Instead of wondering whether the layout will work, they can focus on how they want the space to feel. The process moves forward with fewer stops and fewer revisions.
Not every decision belongs to a base price. The base price for this 500 sq ft ADU floor plan doesn’t include permits, blueprints, and finish appliances: appliances, flooring, tile, windows and doors, skylights, millwork, stone surfaces, and certain mechanical systems. By keeping these choices outside the base scope, you decide where to invest and where to keep things simple.
Homeowners choose our company because they want a home builder who communicates clearly and knows how to deliver. Over the years, we’ve completed hundreds of successful builds and earned the trust of homeowners who value follow-through as much as technical expertise. Our team holds the proper licenses and certifications, and we work within California and local building codes every day, not as an afterthought, but as part of how we plan and build. Before construction begins, we explain what we’re building, why it matters, and what it costs, in plain language. Throughout the project, we at Oasis Builders Inc. stay accessible, responsive, and involved, so clients always know where things stand.