Home Additions & ADU Construction

J.A. Mejia Construction specializes in custom home additions and ADU (Accessory Dwelling Unit) construction throughout Sonoma County and the Bay Area. Whether you’re expanding your living space with a second-story addition or building a fully permitted ADU for rental income or multigenerational living, our team delivers seamless, code-compliant solutions tailored to your property. We handle everything from structural integration to finish work, ensuring your new space blends beautifully with your existing home while adding long-term value and functionality.J.A. Mejia Construction specializes in custom home additions and ADU (Accessory Dwelling Unit) construction throughout Sonoma County and the Bay Area. Whether you’re expanding your living space with a second-story addition or building a fully permitted ADU for rental income or multigenerational living, our team delivers seamless, code-compliant solutions tailored to your property. We handle everything from structural integration to finish work, ensuring your new space blends beautifully with your existing home while adding long-term value and functionality.