I had halton hills electrical contracting come in to my home a couple of years ago for some minor electrical work - adding a couple of outlets and installing a bathroom fan. Shortly after they left we noticed that one of the outlets was not wired quite right and my husband was able to reconnect one of the wires to fix the minor problem (should've had them back to do that). The bathroom fan started leaking water about a year after they put it in. My husband went up in the attic and saw that the platic piping that they had used to go to one of our existing vents was laying down on the floor and full of water (condensation). We ended up getting roofers to come in and install a proper vent hole above the bathroom for the piping. As new homeowners we had no idea that what the electricians were doing with the vent was not correct. I would've much preferred them to tell me they coudln't do it or that we needed a new vent rather than deal with water damage down the road.