Step 3 · Step 3: Measure Stair Width

Now, let's get the width. Measure your stair from one side all the way to the other (from the wall to the balusters, for example). This measurement gives you the total width you have to work with. Hold the tape measure taut and parallel to the front of the step for the most precise reading. This number will help you decide how much of that beautiful wood you want to frame your new treads.