I was thinking about sticking another IRIS on an external outlet outside my garage to help but that means drilling a hole and installing it and running conduit inside the garage…which can be done.
@kahilzinger There is a how to article in the community – created wiki on automating an outbuilding which should give you some additional ideas. Although it is mostly discussing US equipment, the principles would apply with other equipment as well. And it does answer several of the questions that have been raised in this thread.
http://thingsthataresmart.wiki/index.php?title=How_to_Automate_an_Outbuilding
Yes, but the set up is a little complicated. See the how to article in the community – created wiki on how to automate an outbuilding. It discusses a couple of different methods for this.
http://thingsthataresmart.wiki/index.php?title=How_to_Automate_an_Outbuilding
Thank you for sharing this wiki link. Very helpful. Basically the answer is that i need to perform a cocktail of solutions to get it working = no consumer friendly … i dont understand why smartthings does not consider this? Small commercial applications become much more easy…
The only inexpensive mass market hub that I know that can do this easily for both Z wave and zigbee is wink, but you can’t use custom code with Wink so it’s a much more limited rules engine and you can’t use as many different zigbee and Z wave devices with it.
Every system has pluses and minuses, you just have to find the one that best matches your own needs.
The official answer for SmartThings is probably that if you can’t reach the outbuilding with a repeater, you can’t coordinate devices between the two buildings. (Option 1 in the wiki article.)
But the people in this community are very creative, and they have come up with a bunch of different ways where you can do it. 
That’s a testament to the flexibility and versatility of SmartThings, but it doesn’t mean any of the methods are going to be easy. Fortunately, there will always be people in the community who will be glad to help you figure it out.
It’s like super easy to just set up another location. If your home/garage is truly automated then, you shouldn’t be using the app much once you set up the automation rule…
If you “really” need the devices listed on the same app page then make a virtual switch and use IFTTT. However, I have 4 different locations and I do not find too much of an issue changing locations to get to those location devices.
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It looks as though you may have missed the following part of the conversation:
can different locations trigger each other to do things? for example, location 1 detects an “arrival sensor” and tells location 2 to turn on a specific light ?
It is indeed super easy to set up a second hub as its own location if you don’t need it to interact with any of the devices that belong to the first hub.
But once you want to have a rule that combines zigbee and zwave devices from both locations, things get much more complicated. That’s what the wiki article referred to upthread is all about. If you truly want to extend your main building network to devices in the outbuilding, it can be done, but I definitely wouldn’t call it “super easy.” 
If you just want two completely independent networks in two separate buildings, each with their own separate rules, then, sure, setting up a new location is simple. But that isn’t what we’ve been discussing here.
Awwww…got it. IFTTT works but is too slow if you need things to happen right away. I guess I kinda treat each room as it’s own entity so if that room was in another location then…
However, it seems like the smart folk over at ST should be able to link Hubs? Hmmm why isn’t this a feature now that I think about it?
Read the wiki article. The smart folks in the community have figured out a number of alternatives.
http://thingsthataresmart.wiki/index.php?title=How_to_Automate_an_Outbuilding