The place you buy if from may do it for free, if new, or charge a small fee of $50-100.oo or less. If you hire a handy man that could vary. Both appliances come with directions how to hook up. The washer is easier than the dryer. You have a hot and cold line that connects from the washer to the spickets behind the washer, they are marked on the hoses. There is another hose that goes in the back of the washer that goes to the same spot that drains the water out on the spin cycle and a plug. On the dryer there is a plug and the vent hose that goes from the back of the dryer to the vent hole in the floor or wall. Takes less than an hour to do both. This is IF you have hook-ups already in place for a washer and dryer. If not, the costs are going to be a lot more significant. The cost depends on where you are putting the washer and dryer. If plumbing and electrical lines are close by it might run you about $400-500 for everything. (water lines to the washer, drain for the washer, electrical to the dryer and vent for dryer) However, it can be several hundred dollars more if you need to run plumbing and electrical lines significant distances (20 ft or more). To make it the cheapest possible, pick a location where water lines and an electrical box are less than 10 ft away. Also, if you do it yourself, you can save a lot of money and might only spend $100-200 in materials.