In the desirable community of Rossmoor, homeowners are increasingly turning to Accessory Dwelling Units (ADUs) to maximize their property’s potential. Whether you’re planning to house extended family, create a rental income stream, or simply add usable space, Orr Construction Company is the ADU builder Rossmoor residents trust for customized solutions, thoughtful design, and high-quality construction.
From detached guest houses to garage conversions and above-garage apartments, our veteran-led team manages every detail of your ADU project—from permits to move-in.
Veteran-Owned. Rossmoor-Focused. Results-Driven.
Founded by U.S. Army combat veteran Robert Andrew Orr, Orr Construction Company brings military-grade discipline and structure to every construction project. With more than 150 successful builds across Southern California, our team is deeply experienced in residential construction—and we specialize in helping Rossmoor homeowners design and build ADUs that meet their functional, aesthetic, and zoning needs.
As a certified DVBE, SB, and SDVOSB contractor, we offer full licensing, insurance, and a track record of integrity that Rossmoor families can count on.
Tailored ADU Design and Construction
Every property is unique—and so is every ADU. We work closely with you to determine the best use of your space, whether you’re adding a detached unit, converting your garage, or building up.
Our ADU services include:
- Feasibility studies and zoning analysis
- Custom design for detached, attached, or above-garage ADUs
- Full permitting and planning support
- Ground-up construction or conversion of existing space
- Kitchens, bathrooms, HVAC, utilities, and finishes
- Smart features and energy-efficient upgrades
We ensure your ADU is fully code-compliant, beautifully finished, and aligned with your property’s value and goals.
Our Proven ADU Building Process
Building an ADU involves more than just construction—it’s a strategic project that requires the right team, the right plan, and the right execution. Our four-phase process makes it simple and clear from day one.
1. Property Evaluation & Consultation
We start with a site walk and detailed discussion of your goals, timeline, and budget. We’ll assess your lot’s size, setbacks, and Rossmoor-specific zoning rules to determine what kind of ADU you can build.
2. Design & Planning
We collaborate with architects and designers—or work with your chosen team—to develop a plan that fits your style, space, and legal requirements. We handle permitting, plan submissions, and structural details.
3. Construction
Our veteran-led crew manages every step of the build, coordinating trades, inspections, and deliveries. We prioritize site cleanliness, safety, and communication so you know exactly what’s happening and when.
4. Final Walkthrough & Delivery
Once the ADU is complete, we walk through it with you to ensure every detail—from fixtures to finish—meets your expectations. We don’t consider the job done until you’re 100% satisfied.
Why Build an ADU in Rossmoor?
Rossmoor is known for its large lots and single-family zoning—making it ideal for ADU construction. Whether you’re building for aging parents, adult children, or rental income, an ADU can help you:
- Increase your property’s value and utility
- Create flexible living space for guests or tenants
- Provide private accommodations for multigenerational households
- Add resale appeal and long-term investment benefits
- Design a solution tailored to your specific needs
In a high-demand community like Rossmoor, an ADU is both a lifestyle upgrade and a strategic financial move.
Why Choose Orr Construction Company?
Rossmoor homeowners choose Orr Construction Company because we offer:
- Veteran-led project management with a disciplined approach
- Experience navigating ADU-specific zoning and code requirements
- Complete design-build solutions tailored to your property
- Transparent pricing and timeline estimates
- 100+ years of combined construction expertise
We don’t just build ADUs—we build trust, value, and living spaces that feel like home.
Let’s Build Your ADU in Rossmoor
If you’re ready to add space, flexibility, and value to your property, Orr Construction Company is here to help. Call (562) 498-0224 today to schedule your consultation with the ADU builder Rossmoor families trust for smart design and seamless execution.