I was lucky that neither William nor Louis were serious chewers or destroyers. William had the run of the kitchen, hall and study from about 14 weeks or so, although I used puppy pen panels to barricade off the bottom shelves of the bookcases and the computer cables etc. under the desk in the study for a while. He chewed a hole in the front doormat one afternoon and the newel post at the bottom of the stairs has a few toothmarks, but nothing major.
Louis, for all his problems in coping with life in general, has never chewed any furniture, books, cables etc. although he sometimes unstuffs toys. He had a lot of freedom in the house from about 4 months.