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Question DetailsAsked on 7/7/2014

how much to install a double LVL 20ft load bearing beam level with ceiling

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1 Answer


IF running parallel to other floor joists, could be in the $1500-3000 ballpark range if mid-house or $3-5,000 if exterior wall, depending on accessibility and utilities and what the supporting posts are going to be bearing on - in ideal conditions you could snake that long a one in on the diagonal in a joist bay and then tilt it up into position and hammer it into place, assuming of course it is the same height as the existing joists which it would have to be to fit level with ceiling. This does NOT include replacing the drywall ceiling that wouldhave to be cut out to do that - since I am presuming this is part of a larger remodel adding glass wall or full-width pass-through to a sunroom or such maybe ?

This assumes this is ground floor construction, so you are not talking having to carry supporting columns down another floor below this ?

Crossways to existing joists could be $5-10,000 job depending on how much other stuff you have to support temporarily while you put it in, and on if you have to remove siding in the process, which is quite likely if on exterior wall.

Realize this is a real WAG - so much depends on your existing conditons, so you definitely want 3 responsive bids on this type of job. And of course the above all assumes standard studwall construction - can be a whole different story with brick or other building materials.

I am curious as to what this is being used for - because for a 20' beam a doubled standard LVL at presumably nominal 8 or 10 inch depth to match floor joist depth seemsa bit light to be load bearing for that span, especially if there is a floor above it, unless this is just being used to open up an existing non-load bearing intermediate wall ?

I presume you have had a structural engineer/architecture firm do the calcs on what is needed ? Will most likely need that to get the building permit anyway.

Answered 5 years ago by LCD

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