RE: approximate cost to stucco a block wall? I have a block wall that encloses my back yard. It is about 7 feet tall by about 100 feet long.....Any idea how much it would cost to stucco this in Phoenix?I just want to get a ballbark idea before I start contacting contractors for quotes.... typical 3 coat stucco system will cost roughly $32.50 a square yard-or $3.61 per square foot to do.