Peter from Sigma did a fantastic job removing knob and tube wiring from parts of our main floor and all of the second floor as well as installing a new panel. Because we were replacing our the old hardwood flooring on the second level, he was able to go through the floors to reach the ground level. As a result there was no damage to our plaster walls. In fact, Peter cut only one hole in the ceiling of the closet where the panel was located to get the wires from the attic to the panel. Peter was not easily put off by the challenges our house presented. He took his time to find the best solution to minimize damage rather than the quickest, easiest one. He and his helper Caz were punctual, dedicated, patient with my endless questions, and extremely hard-working. They began the job promptly and finished it in two weeks. I would not hesitate in recommending Sigma to anyone who needs wiring expertise. I jokingly began referred to Peter as an electrical 'genius' but, in fact, I really think he is! Thanks, Peter, for doing such a great job!