Extending a concrete slab for a tool shed

[m3gusta]

I have an 8x10 concrete slab recently poured on the side of my house that I planned to use for a shed. It wasn't until afterwords I realized that I can build a 12x10 without a permit in my area so I definitely want one in that size.

The unfortunate thing is this slab has already been extended once, as the contractor originally had it as a 4x8 - so things are starting to get a little silly here.

Is it necessary to further extend it with concrete to put in a shed? Or would laying down some hardly compacted dirt or gravel for the remaining 4 feet be sufficient?

<a href="https://ibb.co/RQ1S7y1"><img src="https://i.ibb.co/SV2xJr2/IMG-20190918-104131.jpg" alt="IMG-20190918-104131" border="0"></a>

 

[Git]

Well, you didn't need concrete in the first place (gravel would have worked) but since you need to work with what you have, if it was me, I would just go ahead and add the other 4 feet. I think you may regret it later if you don't

 

[Stuart in MN]

Is the shed going to have a wood floor on top of the concrete, or is the concrete the actual floor? In that case, leaving a section without concrete seems to me like an invitation for critters to dig their way inside.

 

[bamawildcat]

Dowels and more concrete. Once the shed is on top no-one will notice. Check and make sure your guy used dowels the first extension or else you'll had some odd heave between seasons.

 

[m3gusta]

Is the shed going to have a wood floor on top of the concrete, or is the concrete the actual floor? In that case, leaving a section without concrete seems to me like an invitation for critters to dig their way inside.

I'm looking at a simple TuffShed which looks like it has a wood floor.