Hello,
There are a few factors to consider.
If you are doing structural work. An engineered drawing should be done and permit. Rough cost $ 1,000 to $3,500.
What is holding up each end of the beam? Are the post sitting on existing foundation? Is the beam being installed in the basement, main floor or other floors?
Main beam with no additional work budget $5,000.
Add roughly $2,000 for every additional floor.
Add 3,000 if you have to put footings in the basement.
If there is electrical or plumbing in the wall you will need to have an allowance for that as well.
And the you will need an allowance to make good all the areas that where disturbed.
Hope this helps.
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