Adding a Powder Room

We own a 1-bathroom home in El Cerrito and are finally ready to add a half-bath/powder room. We plan to do this by carving out space from our laundry room. 

I would love to hear from anyone who has done this about how much this project cost you. We're not planning on anything fancy... just a nice little room with a toilet and a sink will be a heavenly addition to our home.

Also, can anyone recommend a contractor for this job?

Thanks!