I am afraid you are not going to find the equivalent of a Mr. Bricolage or Bricomarché on Crete. There is a Praktiker
in Heraklion which might help but otherwise you are simply going to have to find individual merchants that have what you want.Kafkas
is good for all electrical supplies and will get stuff for you very quickly. It serves both trade and retail, although you need a business ΑΦΜ to get trade prices. They have stores in Chania and Rethymnon. Click on ΚΑΤΑΣΤΗΜΑΤΑ at the bottom of the page to find locations. In the Chania area I am told that Terzis
is pretty good for bathroom/kitchen/tile supplies etc. Panagiotakis
is a pretty big timber merchant not far from Terzis on the opposite side of the national highway. Both are not far from the junction of the National Highway with the Omalos road. If you go out on the Omalos road for a few km there is a big plumbing store selling all the basic plumbing requirements, e.g. pipework, fittings etc, on the right hand side. You can't miss it - lots of pipework and black tanks outside. Also if you go into Chania on the Omalos road shortly after it meets the Chania - Kissamos old road there is a big metal supplier, Gavrilakis next to Voi Noi shoe shop, and another, Sidal, about 0.5 km further into Chania, both on the right hand side.