Deck Staining Dec, 2016. Call Portland Roof and Deck for all your roofing and decking needs. 971.221.5495.Portland Deck Staining.This price list includes pressure washing of the deck and 1 coat of stain. We would suggest a darker color on a older deck like dark chocolate, If you are looking for a clear stain then we will most likely need to inspect the decking prior to providing a free estimate. We will probably need to remove the old stain with a cleaner and then wash the deck.Our price is $6.75 per square foot of the deck and railing system.Example: Deck 12′ x 16′ = 192 square feet. + railing system 3′ x 40′ = 120 square feet. Total square feet of 312 x $6.75 = $2106.00Any decking that is higher than 10 feet off the ground, you will need a free estimate before we can do any work. We can usually provide a actuate estimate with a couple photos of the deck via a text or emailed to us.503.465.4940.sales@PortlandRoofandDeck.comDeck Restore Product.