Washer/dryer installation

I want to buy and install washer/dryer in my basement soon. There is no washer/dryer ready situation. Who should I call to make w/d ready? plumber? Please recommend someone who can do this with reasonable price. BTW How much does it cost approximately? Gas dryer is better and economical than electric one?
Please give me your thoughts. Thanks!

By momo | 04/10/2009 10:52 AM