I need some advice on stair trim molding. I have a short stairway that goes from our mud room to our kitchen (seven treads) that our contractor built during a remodel last year using some pretty simple wood treads. Unfortunately, he didn't put in any sort of trim molding on the stairs at the time, so the joint between the wall and the stair doesn't look very good. We had done a ton of work during this remodel and been out of the house for months, so we were ready to get the contractor out and had bigger issues than trying to get him to fix this.
Now the time has finally come for me to finish these stairs but I can't find any information on how to install stair trim molding. I'm open to pulling out the treads and risers, installing the molding and then putting in better, nicer treads to replace the existing ones, but I'd like to know what my options are and if there's a way to add stair trim molding without tearing up the staircase.