Finishing a basement in Los Angeles, CA typically runs $30–$75 per square foot — most full basements land between $25,000 and $65,000. Adding a bathroom is the biggest extra, followed by egress windows, which building code requires for any basement bedroom. Moisture comes first: finishing over a damp basement is money buried twice.
Typical in Los Angeles, CA: basic finish $30–$50/sq ft; with a bathroom and better finishes $50–$75/sq ft. Egress window installation $3,000–$5,500 each.
A licensed contractor with permits — a basement bedroom without egress is a code and safety issue, and unpermitted finished space usually has to be disclosed (or discounted) when you sell.
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Data by Servik — verified local pros from official license records and public sources. Cost figures are typical ranges, not quotes; a pro's written estimate is the real number.