I recently just bought a 100 year old home, which has never had a dishwasher. Therfore , there are no existing hookups for a dishwasher. I am thinking about hiring someone to place hook ups, for a dishwasher and also install the dishwasher. My question is how much cost am I looking at for new hookups and installation of dishwasher.

Thank you,

I couldn't begin to estimate the cost of installing a dishwasher, it all depends on the cost of labor in your area. This cost will be primarily the cost of the cabinet work required to make space under the counter top for the dishwasher. There is no "house plumbing" for a dishwasher. A small, usually bendable, copper pipe is connected to the hot water supply underneath the sink and runs to the dishwasher for the water supply. The dishwasher comes with a flexible drain hose. A hole is usually drilled through the side of the sink cabinet. The drain hose passes through this hole to the inside of the sink cabinet.
This hose is connected to either an air gap or to the drain pipe or garbage disposal.
Some areas require an air gap others may not. If an air gap is not required or not installed, the hose from the dishwasher is secured as high as possible under the counter and then drops back down creating loop to prevent water from the sink from entering the dishwasher.
If the air gap is required, a hole is drilled in the back flange of the sink and the air gap is installed. The hose from the dishwasher is connected to the small center pipe of the air gap. A hose is connected to the larger pipe of the air gap and to the drain. The dishwasher pumps the water up to the air gap where it is diverted and flows back down to the drain.
If you have a garbage disposal the dishwasher drain is connect to the disposal, there is a special pipe stub for this. The disposal comes from the factory with a plug in this pipe which must be removed if a dishwasher is used.
If there is no disposal, there is a special pipe that is used between the sink and the trap with this pipe stub for connecting a dishwasher.

While there is some plumbing work in installing a dishwasher, it is mostly just connecting a supply line and a drain to existing plumbing. The real work is the cabinet work to make space for it and that depends on you unique situation.