Accessory Dwelling Units (ADUs)

We bring your ideas to life through detailed architectural plans and immersive 3D renderings—so you can visualize every corner of your future ADU before construction begins.

At Only One Construction, we also take care of the entire permitting process, ensuring that every design meets local building codes and regulations. No guesswork, no surprises—just a clear path forward.

Before construction begins, we make sure your site is ready. If needed, we’ll remove existing structures, clear the area, and grade the land to create a clean, stable foundation.

Our team also ensures that all essential utilities—water, power, and sewer—are properly accessible, setting the stage for a smooth and efficient build.

For ground-up ADU construction, utility setup is a critical foundation. At Only One Construction, we handle the full installation and connection of plumbing, electrical, and HVAC systems—ensuring your new space runs smoothly from day one.

Our team designs energy-efficient solutions tailored to your specific needs, including water and gas lines, electrical panels, and proper ventilation. Every element is thoughtfully planned to meet local building codes and integrate seamlessly with your property’s existing infrastructure.

The result: a safe, efficient, and future-ready utility system built with precision.

Every great structure begins with a solid base. At Only One Construction, we pour high-quality foundations—whether slab or raised—engineered to meet structural standards and tailored to your site’s conditions.

This crucial step ensures long-term stability, durability, and the structural integrity your ADU deserves.

This is the exciting stage where your ADU begins to rise. We construct the walls, install windows and door frames, and complete the roofing to create a secure, weather-tight structure.

Every element is built with precision, forming the strong, protective shell that brings your vision one step closer to reality.

With the structure in place, we move on to installing the essential systems—plumbing, electrical wiring, and HVAC. Our team ensures every connection is code-compliant, efficient, and built to perform reliably for years to come.

It’s the step that transforms your ADU from a shell into a fully functional living space.

To ensure year-round comfort and energy efficiency, we insulate walls and ceilings using high-performance materials. Once insulated, we install drywall with expert precision, giving your ADU a smooth, clean finish that’s ready for the final touches.

It’s the perfect blend of functionality and aesthetics.

To ensure year-round comfort and energy efficiency, we insulate walls and ceilings using high-performance materials. Once insulated, we install drywall with expert precision, giving your ADU a smooth, clean finish that’s ready for the final touches.

It’s the perfect blend of functionality and aesthetics.

With structure and systems in place, it’s time to add personality. We install your selected flooring, apply premium-quality paint, and add elegant finishes like trim, molding, and details that elevate the overall look.

This is where your ADU transforms into a warm, inviting space that truly reflects your style.

We craft and install custom cabinetry, countertops, and fixtures that bring functionality and elegance to your kitchen and bathroom spaces. Every element is thoughtfully selected and expertly placed to ensure a seamless balance between beauty and everyday practicality.

At Only One Construction, we build spaces that work—and wow.

Once construction is complete, we carry out detailed inspections to ensure every element meets our highest standards—and yours. Clear communication remains at the core of our process, and we review every detail with care.

To wrap up, we guide you through a final walkthrough of your new ADU, ensuring you’re fully satisfied and confident in your space from day one.

Your ADU is officially complete—ready to be lived in, shared, or rented. Whether it’s designed for family, guests, or tenants, this new addition brings comfort, flexibility, and lasting value to your property.

At Only One Construction, we don’t just build structures—we help you create meaningful spaces.