Our Prefab Modular Homes in Sonoma County, California.
In Sonoma County, CA, we have worked on several projects with incredible clients. From new builds to fire rebuilds, we are honored to have helped our clients build their dream homes.
THE JAY
SEBASTOPOL, SONOMA COUNTY
MODULAR ADU (Accessory Dwelling Unit)
1,183 Square Feet
3 Bedrooms
2 Bathrooms
1 Stories
2 Modular Sections
Year Built: 2025
Essential Details
How much does it cost to build in Sonoma County
Check out our FAQ page read more in-depth answers to the most commonly asked questions about modular homes.
Here in California, typical cost estimates usually range from $225 to $275 per square foot for the modular home itself. This pricing usually includes factory construction, delivery, sales tax, and transportation. At these rates, a 2,000‑square‑foot modular home averages approximately $500,000, including transportation and tax.
At California Modular Houses, we believe transparency is essential. While the factory‑built portion of the home represents a significant part of the investment, on‑site work is additional and varies based on the unique characteristics of each property and jurisdiction.
On‑site costs may include site preparation (such as grading and excavation), foundation construction, utility connections, local seismic and fire‑code requirements, permit and impact fees, transportation logistics, crane and set costs, and the level of interior finishes selected.
Once your plans are finalized and reviewed by your City or County, a licensed contractor can provide accurate, site‑specific pricing for the remaining on‑site scope of work. Our team works closely with clients throughout this process to help ensure expectations are clear and budgets are realistic from the outset.
For our part, whether you are building in Sonoma County or San Diego County, the only price differences are transporation and the the local sales tax rate.
