I could go into great nauseating detail about a house we owned in Texas+roaches....but I will spare you the details.
During the remodel bring in a pest professional to blast those roaches to kingdom come. After that--boric acid. It is cheap, easy, not an insecticide, and will keep any forthcoming roaches dead by gritting up and clogging their airways (roaches breathe through their legs).
Worked for me in Texas, it'll work for you in the less roach friendly Seattle.
Roaches looove electric appliances and wiring. If they're in the building you'll need to have sprayed behind switchplates and electrical outlets, the back of the stove and the fridge. I had them in my radio and toaster too. They are evil little mofos.