max size of timber beams...

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    We were going to build a pergola off the side of the house, but my wife wants it at LEAST 6m X 8m(the 8 meters running along the side of the house, and NO support posts in the middle). I was thinking something a little smaller but I thought I'd give it a look. What is the largest timber beam you can buy for a reasonable price? Is steel required for such a large area?
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