Square foot pricing is generally the industry standard. Since very few people specialize in docks and there is required environmental knowledge and experience to do it correctly; you should bid a little on the high side. Glad to be of service; Do it right, do it efficiently and think about it.00 per square foot times 400 square feet, which equals $400. Although we recommend a per square foot bid, eventually you'll be good at judging and be able to quote a price within seconds by just a glance. The other way to bid a job is by charging an hourly rate plus material costs. Twenty-five cents per square foot will leave you with an excellent profit margin.50 The average deck washer hourly rate is $65 - $90 an hour across the country.00 per hour x 4. For example a 400 square foot one boat dock would be $1. A hard to get to dock will have very little the low-temperature drying equipment competition and you can tack on a quarter to fifty cents per square foot. You need to be careful in bidding these types of jobs. Then there may be a price break at 900 square feet at 75 cents per square foot, another at 1500 square feet at 59 cents and another at 2250 square feet at 55 cents. Large piers and marina docks should be bid lower for a routine maintenance program even though the first wash will be a real tough job.5 hours $337. per hour if you go by hourly bidding.Pressure Washing Companies Pricing Dock And Deck Cleaning If you own a Pressure Washing Company and wish to get business at the local Marina there are a few things you should know.