When we added new flooring in our 1960’s home remodel, it made the top basement stair taller than the others. See how we easily and quickly raised the stair treads to fix the uneven steps and correct the rise of the staircase.
Our top stair was about 2 inches taller, and the bottom stair was about 2 inches shorter, so we needed to update the rise of the stairs to make nice even steps.
A few sheets of OSB (plus what I already had on hand) cost $75-100, and each stair tread was around $10. So our 13 stairs cost around $130 for treads. Grand total around $250 in materials.