J.A. Mejia Construction – Home Additions & ADU Builder in Sonoma County
J.A. Mejia Construction is a licensed and insured contractor specializing in custom home additions and accessory dwelling unit construction throughout Sonoma County and the Bay Area. Their work covers a range of project types, from second-story additions to fully permitted ADUs designed for rental income or multigenerational living arrangements.
As an experienced ADU contractor, J.A. Mejia Construction handles projects from start to finish — including structural integration, code compliance, and all finish work. The goal is to ensure that any new space added to a property blends well with the existing structure while delivering lasting value and practical functionality.
ADU Construction Services
J.A. Mejia Construction works on a variety of accessory dwelling unit projects. Whether a homeowner is looking to build a detached ADU in the backyard, convert an existing garage, or create an in-law suite for family members, the company brings experience in navigating local permitting requirements and delivering code-compliant results.
Their services as an accessory dwelling unit builder include:
- Detached ADU construction
- Garage conversion contractor services
- In-law suite and granny flat building
- Second-story home additions
- Structural integration and finish work
Each project is approached with attention to how the new structure fits within the existing property, both visually and structurally. J.A. Mejia Construction works to keep communication clear and timelines realistic throughout the build process.
Service Area
J.A. Mejia Construction serves homeowners and contractors across the Bay Area and Sonoma County. Their primary service areas include:
- Santa Rosa
- Windsor
- Healdsburg
- Petaluma
- Surrounding communities in Sonoma County and the Bay Area
The company is licensed and insured, with a track record of working with both individual homeowners and general contractors in the region. Their focus is on honest communication, on-time delivery, and results that hold up over time.