Detached ADU with modern design
Detached ADU with modern design
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Cost Guide

ADU Construction Cost Planning in San Diego for 2026

Plan adu construction costs in San Diego around scope, existing conditions, permits, selections, and property-specific contractor guidance from Cali Dream Construction. Our team serves homeowners throughout Pacific Beach and greater San Diego County.

Cost Planning Snapshot

Limited-scope projectPriced from the written scope, existing conditions, and selected materials
Major renovationAdds layout, building-system, structural, and trade-sequencing requirements
High-end projectAdds custom materials, detailed finish work, and project-specific coordination
Planning contingencyEstablished for the actual property and documented scope
Permits and professional documentsDefined when the property and jurisdiction requirements are known

A responsible project number requires a property review and written scope. Drawings, selections, utilities, structural changes, access, permits, and existing conditions can materially change cost.

What Drives Cost In San Diego

  • Detached ADUs cost more than many garage conversions because they need foundation, envelope, and utility work.
  • Sewer, electrical panel, trenching, and fire separation can change the budget materially.
  • Plan review, coastal overlays, and site access affect timeline and carry cost.
  • Rental-ready finishes, durable flooring, and storage add long-term value.

How To Keep The Budget From Drifting

Lock selections early, separate must-have scope from optional upgrades, and review allowances before signing. Vague finish allowances, concealed conditions, structural requirements, and permit-driven changes can alter the final scope.

Cali Dream Construction develops project-specific pricing from the property and written scope instead of publishing a teaser price.

Need an ADU builder in San Diego? Explore the Cali Dream Construction ADU & garage conversion services page - permits, design-build, and construction across San Diego County.