Cost Snapshot
| Budget project | $150,000 to $240,000 |
| Mid-range project | $240,000 to $400,000 |
| High-end project | $400,000 to $650,000+ |
| Typical planning contingency | 10% to 15% |
| Permit and plan review allowance | 1% to 4% of construction value when permits apply |
Final cost depends on drawings, finish selections, utility work, structural changes, and permit scope. Use this as a planning range before a site-specific estimate.
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. The biggest overruns usually come from vague finish allowances, structural surprises, and permit-driven plan changes.
Cali Dream Construction prices these conversations around real scope so a homeowner can compare options without bait-and-switch numbers.