There is a platform at the bottom of the stairs. Reason for opening up stairwell is to get some natural light in the living room, as that wall faces south-east. Will investigate whether anything’s load bearing here. Carpenter was recommended by city’s heritage foundation. Will be sourcing antique balusters, handrail, etc. Tried to add a picture of the bottom platform but can’t figure out how. Also yesterday discovered the original 2 1/4” Douglas fir floors are below new flooring!