House Call (Forbes.com) Forbes.com - It says something when the world's largest home-improvement retailer, with  #36;65 billion in sales, is willing to risk its reputation on an  #36;800 fee. Home Depot customers do 25 million transactions each week, and most are happy enough to come back. But the relationship has always ended at the store's threshold. It left to plumbers, electricians and handymen the mud tracks in the living room, the punctured pipes in the basement and the inevitable budget overruns.