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Build on or replace (rectangle vs ell)

Slowbuilder

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Joined
Mar 14, 2016
Messages
265
Location
Chandler, AZ
I've been mostly lurking for some time, but now I need to tap into the wisdom (and opinions) of the GJ Gurus.

We recently moved into a home where there is room to (and no HOA to veto) build a shop. My objective here is primarily car repair and restoration, but there will be other projects (light woodworking, metal fabrication, etc.) included as well.

Already existing on the site is a 20x27 Tack Room/Garage/Man Cave, which sits in the corner of a 43x40 slab. Next to the current garage is a 23x20 canopy that was used to protect the hay supply while there were horses on the property. My initial plan was to keep these structures as-is (mostly), and build an "addition" onto the back of the garage, but going the full width of the slab (the 43' dimension), and about 25' deep. The garage has an interior height of 8' at the edges, with the center of the building at 8'4", so not alot of overhead room. The addition would be 14' tall inside to accommodate a lift at some point in the future. So the addition would be 25x43x14, the existing garage 27x20x8, for 1615 sq ft of shop space. I planned on opening up (as much as is structurally wise) the common wall between the two, giving me an ell shaped area inside, with a 20x23 covered area outside, and a 43x13 apron in the front. The existing garage is stick built, vinyl siding, asphalt shingles. It really doesn't match the house in any way.

But I started playing around with a SketchUp sketch of the structure, and got to thinking (a dangerous activity) that it might be more cost effective, and provide more usable space to remove the existing building, and build a 43x36 (1548) or 43x40 (1720) structure on the slab. Taking this approach would save the cost of the new slab, and free me up from any constraint (real or imagined) to match the existing structure, i.e., a metal building, rather than a shingled and sided stick built structure. Plus, I think a rectangular shape would provide more usable space than an ell, especially since I would need more large doors to provide access to the "inner" parts of the ell.

So which is better? A rectangular box, or an ell?

I've attached a couple of sketchup views of what the proposed ell shaped structure would look like. The existing structure is in light blue/grey, with the slab shown textured grey.

BTW, I'm in Arizona, so while A/C is a must, freeze/thaw cycles are not a concern.
 

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raferguson

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Aug 31, 2017
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63
Location
Colorado
I think that your sketches are of your proposed new arrangement, but I did not see a sketch of what you have today. Not sure where the house is located relative to this large slab, or where the driveway is.

Realistically, you should sketch up a couple of options, and then figure out the cost of each option, before you make a final decision.

Yes, we would all like to have the perfect large shop, but you might be just as well off having several small shops/sheds/garages.

Richard
 
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Slowbuilder

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Joined
Mar 14, 2016
Messages
265
Location
Chandler, AZ
raferguson: I haven't sketched up the rectangle option yet. The existing garage is the structure with the light blue roof in the overhead view, the addition has a white roof. The wall between the existing garage and the addition, giving contiguous space in both structures. In both options, I end up with around 1600 sq.ft. of shop space, the question I'm struggling with is "Will the ell shape be as usable as a rectangle?" I think not, but I'm open to arguments and opinions to the contrary.
 

kbs2244

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Nov 11, 2006
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14,065
Do you like to work outside?
In Chandler I would expect you would like the shade of a big roof over a big building.

The ell will give you more access with the right door arrangement.
 
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2level

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Apr 10, 2008
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1,146
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Washington
I like the looks of most L-shaped buildings vs. rectangle or square ones. And, like kbs2244 mentioned, the ell can give you better access. It's often easier/cheaper to clear span an L-shape too.
 
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Slowbuilder

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Chandler, AZ
kbs2244: I do enjoy working outside (October to May), and having a shaded area to work and for outside storage is attractive.
2level: I hadn't thought of the cost savings of the shorter clear span of the ell which is a good point. But I think that cost savings will disappear in the expense of pouring an additional 25x43 slab (budgetary quote from concrete contractors: $4800 - $5000).
 

2level

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Washington
Wouldn't the 5k expense for the slab be offset, in part or whole, by the cost savings of not having to demolish and dispose of the existing building?
 
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Slowbuilder

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Chandler, AZ
2level: Yes, there would be some offset in the cost - but I'm good at demo, and I work cheap!!
CraigStu: Now that is a valid question! As far as I can tell, the existing slab is just that - a slab w/o stem walls. I was looking at Absolute Steel Buildings (https://www.absoluterv.com/), and they specify a 12"x12" footer around the perimeter to support their steel structure. I'd probably have to pour that around the entire slab (or jackhammer it and start over), which would then be a "custom" size with added cost. I expect to get some steel building vendors to come out and have a look at the project to see what THEY recommend...
 
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