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Forum topic by agallant posted 10-08-2013 03:25 PM 941 views 0 times favorited 3 replies Add to Favorites Watch
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551 posts in 2880 days

10-08-2013 03:25 PM

For those of you out there that have done this before I have a question. I have a shop that is detached and 12X16. I can live with the 16 but I would like to double the width and make it 24X16.

Option 1 is to expand by building out the deck, taking the roof off, taking off the side wall expanding the front and back walls, building new side wall and new roof.

Option 2 is to rip down the old one and build new.

I think option 1 is easier but I just want to sanity check this with people who have done it before. If you have lived through this I would like to hear what your thoughts are on the subject.

3 replies so far

View ksubenny's profile


74 posts in 1852 days

#1 posted 10-08-2013 04:27 PM

To me it depends a lot on how the building is currently laid out and what way the rafters are running. Having to rip off the roof and do new rafters to span the new width would be a big expense and may push the cost up high enough that building new would be more cost effective. I realize that you’d rather double the 12’ dimension to 24’ instead of making it longer and going from 16’ to 24 or 32, but the way it sounds if you expanded that way you’d be able to do by adding new rafters and running the roof longer, not necessarily having to rip all the way down.

Do you have the sidewall height to put a lean too style addition on one/both sides to allow more storage space and have more of the interior space dedicated to workspace?

View Dan Lyke's profile

Dan Lyke

1520 posts in 4119 days

#2 posted 10-08-2013 06:19 PM

Yeah: If the rafters are running across the 16’ dimension, this is a no-brainer: Just match the roof-line and build out.

If the rafters are running across the 12’ dimension you’re either going to have to support them on that end (and build a T peak into the roof), or tear off the roof entirely and rebuild the superstructure. But you could do that in stages: Switch the direction of the rafters first, then tear off that wall and build the new building…

-- Dan Lyke, Petaluma California,

View MrRon's profile


4758 posts in 3237 days

#3 posted 10-09-2013 06:30 PM

I think one factor would be to evaluate the existing construction. Is it well built or was it hastily thrown together? If the existing is in good shape, I would add on, but if it has a lot to be desired, tear it down and start from scratch. Are there any features that you are planning for the addition that you would want to extend to the existing building? The biggest arguement for new vs expand is the roof truss layout. I’m guessing the trusses run the 12’ direction, so if you make the building 16’x24’, you will have to run new trusses the 16’ direction. You don’t have to tear it all down; just the roof. The walls can remain.

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