How much does a residential addition cost in San Francisco (94122)?
medium confidence · based on 31 filed projects≈ $120,000
typically — most residential addition projects run ≈ $71,500–≈ $260,000
Residential addition projects filed in San Francisco (94122) typically run about $120,000, with most between $71,500 and $260,000, based on 31 filings (San Francisco public records, DataSF).
These are comparable filed projects in San Francisco — a typical reference range, not a quote. Your project can land anywhere in the spread depending on scope, materials, and access.
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