Fahim, if you have an ounce of technical ability you can simply do it yourself and save a bundle.
That said, what you want should take no more than a couple of hours (plus travel) but could take longer depending on the construction of your dwelling.
For example a single storyhouse with brick veneer construction is relatively easy to cable to any of the external facing walls. Internal walls can be a problem as there will likely be nogging in the walls preventing access to the lower half of the wall.
To give you a rough idea we would quote probably around 2 to 3 hours plus materials, should be no more than $300 to $400. If you can drop the walls and run your own cables you would do the job for as little as $50
There are other alternatives such as dect telephone extenders and ethernet over powe adapters.
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