Cost to stain treads

Q: My stairs are a year old natural oak colour, with no stain on them. We simply want to stain them a darker stain. What is the ballpark cost of hiring someone to do this?

We are also replacing the wooden pickets with wrought iron ones so, the pickets wouldn’t have to be done. Any idea? – Ontario

A: At least $50 per tread only to stain and finish.