ADU in Los Altos | Case Study | Oria Builders
| Project Type | ADU |
|---|---|
| Location | Los Altos, CA (North Los Altos) |
| Investment | $250,000 - $325,000 |
| Duration | 4 months |
| Completed | 2023-07-15 |
The Challenge
The homeowners in North Los Altos wanted to create a detached accessory dwelling unit (ADU) on their property to accommodate their aging parents while maintaining the beautiful architectural character of their main home. The challenge was to design a structure that felt cohesive with their existing mid-century modern home while meeting all city regulations, which can be particularly stringent in Los Altos. The lot also had tight setbacks, mature landscaping the clients wanted to preserve, and a slight grading issue that required careful planning. Additionally, they wanted the ADU to be energy-efficient, low-maintenance, and equipped with modern amenities for long-term comfort.
Our Approach
Oria Builders began with an in-depth consultation to fully understand the homeowners' functional needs and aesthetic preferences. We collaborated with a local architect to design an ADU that blended seamlessly with the main home, mirroring its clean lines, flat roof, and neutral palette. To meet Los Altos' unique zoning and setback requirements, we conducted a detailed site analysis and worked closely with city planners to ensure compliance. Materials were selected to balance durability and style—low-maintenance exterior siding, energy-efficient windows, and premium finishes inside. The homeowners were also actively involved in every stage, from layout planning to material selection. Before construction began, we secured all necessary permits, including building, electrical, and plumbing, ensuring a smooth start.
Build Process
The construction process kicked off with site preparation, including grading adjustments to address the slight slope on the lot. Our team carefully protected the property's existing landscaping, including several mature trees that the homeowners wanted to preserve. Once the foundation was poured, framing moved quickly, with our skilled crew ensuring precision in every detail. High-performance insulation and energy-efficient windows were installed to adhere to California’s Title 24 energy standards. Inside, custom cabinetry, durable porcelain tile flooring, and premium quartz countertops were installed with meticulous attention to detail. Despite supply chain challenges affecting some materials, our team stayed ahead by ordering key components early. Weekly progress updates kept the homeowners informed, and we completed the project on time and on budget.
Scope of Work
- Site preparation, including grading and clearing
- Foundation pouring and framing for the ADU structure
- Installation of energy-efficient windows and insulation
- Plumbing, electrical, and HVAC system installations
- Custom cabinetry and quartz countertop fabrication
- Complete interior and exterior painting and finishes
Materials & Features
- Energy-efficient windows with low-E glass
- Quartz countertops in Calacatta Gold finish
- Durable, non-slip porcelain tile flooring (24x24 format)
- LED lighting fixtures throughout to enhance energy efficiency
Results
- An additional 800 square feet of living space added to the property
- Estimated $300,000 increase in property value
- Energy efficiency improved by 30% compared to similar structures
- A fully functional, modern living space for multi-generational living
Project Highlights
- Completed two weeks ahead of schedule despite slight grading challenges
- Zero unexpected costs—project stayed within the agreed budget
- Preserved mature landscaping as requested by the homeowners
- Earned high praise from city inspectors for compliance with Los Altos zoning codes
Client Testimonial
"Oria Builders turned our vision into reality. The ADU is not just functional but beautifully crafted. Their team respected our timeline and budget, and the results exceeded our expectations!"
— Karen L., Homeowner in Los Altos
Frequently Asked Questions
How long did this ADU project take?
The project was completed in 4 months, including design, permitting, and construction. By staying on top of material orders and maintaining a tight schedule, we even finished two weeks earlier than planned.
What was the total investment for this project?
The investment for this ADU project was in the range of $250,000 to $325,000. The final cost depended on premium material choices and custom design elements.
Did the homeowner need to move out during construction?
No, the homeowners were able to remain in their main home throughout the construction process. Our team worked carefully to minimize disruption and maintained a clean, organized worksite.
What permits were required for this project in Los Altos?
The project required building, electrical, plumbing, and HVAC permits, all of which we secured through the Los Altos city planning department. Navigating the local permit process took approximately 6 weeks.