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Extend garage 12 feet

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GlennC

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Aug 2, 2017
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3
Location
Silvis, IL
I have a 24' x 30' deep detached garage, with a gable roof. I would love to extend it 12' deeper for a total of 42'.
Is this possible?
I've never done building construction before. So I'm sure I'll have a lot of questions. I want to do most of the building myself. Probably pay professionals to do the concrete work.
 
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matt_i

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Mar 14, 2008
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SE Michigan
My free opinion is to match the same type of concrete foundation as you already have, so there aren't different systems which could "fight" against each other.

Next challenge is to match the trusses as exactly as possible, you don't want to have a little wow that can be seen from way back, where the two buildings meet.

There will certainly be challenges with matching siding and roofing, it may be a good time to consider a tear-off and re-roof of the entire thing. Then you won't have any matching problems plus gain another ~30 years before it has to be done again.

I don't know what you have for electrical but I'm guessing you will want to expand it slightly or more seriously, if you are intending to add workshop space instead of just parking space.
 
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spudley

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Dec 27, 2016
Messages
702
Location
Northeast Wisconsin
GlennC said:
I have a 24' x 30' deep detached garage, with a gable roof. I would love to extend it 12' deeper for a total of 42'.
Is this possible?
I've never done building construction before. So I'm sure I'll have a lot of questions. I want to do most of the building myself. Probably pay professionals to do the concrete work.
Click to expand...
Another method of extending the gable side is to tuck the extension under the existing roof line and then build out from there. That saves the mismatched roof shingle situation and a 24' width should allow plenty of headroom for a gable side overhead door if that's what you have.
In any case, extending out toward a gable end is possible and relatively easy, if permitted.
You'll get the full GJ design crew working on this by posting pictures.
 
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Falcon67

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Jun 11, 2009
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18,371
Location
Merkel, TX
>You'll get the full GJ design crew working on this by posting pictures.
LOL, for sure.

The basic steps would likely be - remove siding at existing corners and remove siding at gable. Stand up the walls from the existing studs out. Set a post on the end wall to support the ridge board. Peal/remove shingling back to ridge so you can remove whatever trim/facia items are on the gable. Run a new ridge board from the existing to new end wall. Set rafters/joists, plan for new overhang/facia/trim on new end gable, deck, tie in shingles to existing and finish, exterior siding. Should be dried in and can work the inside.

>I've never done building construction before.
https://www.amazon.com/dp/1561589675/?tag=atomicindus08-20

https://www.amazon.com/dp/0486202429/?tag=atomicindus08-20

Maybe this also
https://www.amazon.com/dp/1111136130/?tag=atomicindus08-20

I have a great - older - book on framing and construction, will try to find the name.
 
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MikeF2316

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Dec 29, 2012
Messages
9,605
Location
Thornhill, ON
I extended mine back 12 feet, but it was only 12 feet wide. I didn't take down the back wall of the existing garage, I just added a man door. That way there's a separate room in the back.

I resided the whole thing, but for a number of years the shingles on the back ⅓ didn't match.

I had a pro do the concrete, but I did everything else, with help from brothers, father and neighbour.
 
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