January 4, 2026|By One Stop Builders
ADU vs room addition comparison for San Diego homeowners. Costs, rental income potential, and which makes more sense.
Need more space? San Diego homeowners often debate between building an ADU or a room addition.
The Key Difference
ADU: Separate, complete living unit with kitchen, bathroom, and entrance. Can generate $2,000-$4,000/month rental income.
Room Addition: Expansion integrated with main home. No direct income but adds living space.
Cost Comparison
Both can range from $150,000-$350,000 depending on size and scope, but ADUs generate rental income to offset costs.
Property Value Impact
ADUs typically add 20-30% to property value and appeal to investors and multi-generational buyers.
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