Question: how much does it cost to have a deck power washed and stained?
Answer: The average cost to power wash, stain, and seal a deck is $1.57 to $4.04 per square foot. A 12x12 deck costs $226 to $582 to stain when paying someone, or $59 to $176 to stain it yourself. A gallon of stain costs $20 to $50, which covers 200 to 300 square feet.