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Any carpenters in Windsor, Ontario...?price to put an opening in a wall? - windsor ontario

I have a question prior to an opening in the wall in my house between the kitchen and living room ... creating a kind of breakfast / bar to a bigger room ... approximately 5 "x 2 1 / 2" or something, and then set a simple shelf / counter. Right now there are signs that both sides of the wall, when they pressed the timber, c 'coverage is like a solid wall behind him, but not too much. And I'll try if it works or not. My house is on 2 floors, with the wall, which is above the basement. Is there any way whether or not to break, without all apart?
What would the approximate cost is to do all of them? Are there any carpenters in Windsor, Ontario, are there?