Sealing foundation walls, installing a sump pump, vapor barriers, possibly French drains. Essential to prevent water damage and mold.

Building out walls, possibly ceilings; insulating for temperature control, sound control, and code compliance.

Lighting, outlets, switches, etc.

Installing drain lines, sinks, toilets, showers, etc

Drywall, taping, mudding, sanding, painting.

Options vary—vinyl, luxury vinyl plank, carpet, tile, etc. Must be more moisture-resistant.

Either drywall ceilings or drop ceilings, depending on access to mechanicals and style.

Making sure the space is properly heated/cooled, and ventilated; may need new ducts or extending existing systems.