How much does it cost to finish a basement in Washington, DC?

Finishing a basement in Washington, DC 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.

What you can check yourself

• Fix water before finishes: watch the basement through a rainy season, or fix grading and gutters first — framing over seepage guarantees a redo.
• Ask whether the quote includes permits and an egress window if any room could be a bedroom — unpermitted basement 'bedrooms' hurt resale.
• Price the bathroom separately and honestly; it's often 25% of the whole budget.

Typical cost

Typical in Washington, DC: basic finish $30–$50/sq ft; with a bathroom and better finishes $50–$75/sq ft. Egress window installation $3,000–$5,500 each.

When to call a pro

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.