Around here, washers and dryers are not typically included in the transaction and are not built-in appliances. They are also not included in our state mandated form which lists the appliances which we inspect or not. I think it might be wise to include it in your contract just to be safe though.
I do disclaim washer drain lines from inspection as a general rule.

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Jim Luttrall
Mr. Inspector.net, Inc.
Allen, Texas 75002