HI, I need to get some pricing numbers here on a Timber Retaining wall using 6x6's It is 83 feet long x 30 inches tall, so about 280 face feet of wall I know how to build these walls with the deadmen and all. It is in a customers backyard that just drops off about 30 feet down to revine on about a 30 degree slope. It will be kind of though because the soil is sandy and I will be building the wall on a 30 degree slope, so the base layer will have to be buryed. All she is tring to do Is gain about 6 more feet of back yard. Right now there is only about 2 feet inbetween the deck and where the slope starts down to the creek. So basically I am building the wall about 4 feet down the hilside and then backfilling the wall.. I am estimating about 12 cubic yards of fill soil behind the wall. It is tractor accesable. I appreciate the help. oh, I tried talking her into a concrete block retaining wall but had no luck because she bought the house last year and she already has timber walls on the side of her house and wants it to match!