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Costs
What if the biggest factor in the cost to build an adu in sacramento isn’t the unit itself, but what your property needs before construction can begin? A detached ADU may cost around $200,000 to $350,000, while a garage conversion may fall around $75,000 to $140,000. Treat these as starting ranges, not estimates for a specific property.
The prefab option may look cheaper at first, but the headline quote rarely tells you what your California project will cost from site preparation through final approval. That’s the key to comparing prefab ADU vs custom build cost California homeowners can actually plan around: prefab changes where construction happens, while site conditions and project scope still shape the full budget.
What should you verify before planning an ADU in San Francisco? A property’s layout, existing structures, and applicable rules can shape your options before design or budgeting begins. This adu development guide starts with those early checks, helping you replace assumptions with a clearer view of your project.
That $150,000 contractor bid for your California ADU might actually be a $220,000 project in disguise. It's a common frustration to realize that a quote often ignores the site-specific realities of your property, leaving you to discover the hidden costs of building an adu the hard way. You're likely feeling cautious about low-ball estimates and stressed by the complexity of local building codes. It's completely normal to fear running out of money mid-build when the financial finish line keeps moving.
Check your property and see what's possible.
