Sierra James Construction: Central Oregon's Premier ADU Builders
Sierra James Construction has established itself as Central Oregon's leading ADU builder and design-build contractor. Since 2017, they have been helping homeowners across the region bring their construction visions to life — from full-home renovations to expertly crafted accessory dwelling units. With an on-staff architect, Earth Advantage-certified ADU Specialists, and a commitment to transparency and quality craftsmanship, Sierra James Construction sets the standard for construction excellence in Central Oregon.
Their team of visionaries, planners, and builders approaches every project with the same core values: trust, communication, and a relentless attention to detail. From the first phone call to well after a project is completed, they build genuine relationships alongside exceptional structures.
Comprehensive ADU Construction Services
As experienced accessory dwelling unit builders, Sierra James Construction offers full-service, design-build support for ADU projects of all types. Their certified ADU Specialists and on-staff architect guide clients through every phase — from initial design and permitting to final construction and walkthrough. They stay ahead of evolving city and county codes, ensuring every project meets all local requirements from the start.
Their ADU services include a wide range of project types:
- Custom Detached ADUs — Fully custom detached ADU designs tailored to individual needs and lot requirements
- Above Garage ADUs — Maximizing vertical space on existing lots
- Garage Conversion ADUs — Transforming existing garages, barns, or accessory structures into beautiful, code-compliant living spaces
- Attached ADUs — Seamlessly integrated units that complement the primary residence
- Multi-Generational Housing Solutions — ADUs designed with family accessibility and comfort in mind, ideal as in-law suites or granny flats
- Green Building ADUs — Energy-efficient, Earth Advantage-certified designs for environmentally conscious homeowners
Sierra James Construction is also proud to have built the first ADU using the City of Bend's Pre-Approved Plan — a milestone that reflects their commitment to staying ahead of evolving ADU opportunities and helping clients take advantage of streamlined, cost-saving permitting processes.
For those who already have architectural plans in hand, the Sierra James team is equally happy to step in as the ADU contractor and bring that vision to life with the same high standards of craftsmanship and care they apply to every project.
Design Options: Custom and Pre-Approved ADU Plans
Sierra James Construction offers two primary pathways for ADU design. Clients can work directly with their on-staff architect to develop a fully custom ADU design — optimized for the specific lot, lifestyle, and budget. The custom design process includes:
- Initial site assessment and consultation
- Conceptual design development
- Code compliance review
- Detailed construction drawings
- Permit application support
Alternatively, clients can take advantage of pre-approved ADU plans, which offer a faster permitting process, reduced design costs, proven compliance with local codes, and a streamlined construction timeline. As the City of Bend continues to expand its Pre-Approved Plan Program, Sierra James Construction is well-positioned to help homeowners take advantage of these smart, cost-effective building pathways.
Beyond ADU construction, Sierra James Construction also provides design-build remodels, new construction, and full restoration services — including in-house mitigation, contents management, and repair. Their comprehensive approach means clients have a single, trusted partner handling every aspect of their project from start to finish.
With decades of industry experience, a team of certified specialists, and a portfolio of completed ADU projects throughout Central Oregon, Sierra James Construction continues to raise the bar for what an ADU builder can deliver.