Moving homes is never pleasant. It can come as a nasty surprise when your beloved workstation desk no longer fits in the space you have available. You might wonder what to do. This is also the case when you thought your desk would fit flush but you're left with some extra space. There are a few different solutions that you can apply in order to make them fit.
When we moved into our new home, it was apparent that the IKEA Galant super desk that we had with extensions wouldn't fit at all in the new home office. The Galant is a nice desk, when you have room for it, but in our experience they are magnets for clutter, at least in our case. Even if they have enough space for multiple workstations, they take up a lot of space in any room. This is why we decided to simply sell it and get something more practical. Currently, the IKEA Jonas does the job, we have our sights set on a Herman Miller Airia.
Gary from Germany was in the opposite situation when he was looking for a desk that would fit the entire width of his home office. The IKEA Vika Amon tabletop he chose was a few inches short. Since he didn't want to waste that space, he decided to hack something that would fit. After considering the problem, he came up with a cheap solution: grabbing two extra 2×2 Expedits and combining them with the Vika Amon. Brackets were used to make a nice, wide surface. The Expedits aren't deep enough to fit the entire tabletop, so there is some space for cable management as well as LED lighting strips. Lastly, he added a third Expedit with two drawers on the right side of the desk. The Expedit on the right side has its separator removed, so that it can house bigger computer peripherals, like printers, scanners, etc.
Since the desk is set up against a wall, some LED strips would work very well. Even though you might not thing to have a cable management solution, it would probably make things neater. We like how the Expedit with drawers adds some desk real estate, without making the desk too large. In order to keep the airy quality of this home office, extra shelving could be added by using a few floating shelves. That would stop the enclosed feel you get from a bookcase.
MORE WORKSTATIONS
IKEA Jonas Workstations
The Google Desk and Other Tech Desks
How to Clean Your Desk in 5 Minutes
Living Room Home Offices
Loft Bed Workstations
(via Ikeahackers, images: Flickr member Mkosut licensed for use under Creative Commons and Gary)

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This is why I do prefer a desk that isn't so "desk" like for the home. I've repurposed desks as entryway tables or other purposes once they could no longer serve the office purpose, you can do this with a desk that has an appearance which can also appear to be a table/console.
Another option is to get a smaller desk and rethink your hardcopy file and reference storage. I keep all my paperwork in a utility closet in banker boxes on a chrome industrial shelf, so I no longer need a filing cabinet taking up floor space. I only need to go into the files randomly so this works well for me. This could also work for reference books that are only used occassionally. I store as many items as I can electronically (but ensure you have good secure backup!). I also now search to see if ereader or internet services are available for references as I'm trying to avoid purchasing any more hard copies, if I can manage it.
Think vertical...The storage above appears to be wide and low, replacing with higher, narrower storage will free up some floor space.
If you do have to give up your desk, give it to someone who really needs it, this takes the sting out a bit. Even if you don't get paid for it, if you donate it to a non profit, you could take a tax deduction for it. I had too many suitcases so gave some to students on scholarship who would have trouble affording good luggage on their own. I've also given my beloved sectional (too big for my new place) to a local women/family domestic abuse shelter. They were so appreciative, it felt very good to help them out.
Wanted to mention I've also downsized my equipment as much as possible (but this may not work for everyone, depending on their tech needs).
I've got an HP envy printer, mac time capsule which barely take up any space. I'd like to switch over to a more compact shredder at some point. The printer was more expensive than other compatible printers but as I live in a small studio space and my office is near my bed, it was worth it to me to have something more streamlined and that didn't look like "work".
Does anybody know the desk in the first pic?
I have to admit, I have moved about 21 times in my lifetime and let me tell you I'm only 22, so moving from place to place is hard. In my past i have changed desks two times, and the only on that I managed to save is one that i bought about two or three years ago on sale at a local Target store. This desk isn't so big its actually small compared to the other desks I used before. The way i look at is not how much space I need to use, But how to use it. I'm a graphic artist major college. I need a desk that is just the right size so that i can use it in my apartment, and I look for what material its made of and functionally. Well I am happy to say that I found one that was just the right size for me to put all my things on and yes I do have a lot of things and yet I can do things the computer and on my desk. I have placed my IMac, two external HD's my color pencils brushes, a lamp, and other little nick nacks. yet I still have plenty of room left.
My "desk" came from a garage sale for $15, plus a matching stool. It's a solid wood children's drawing table. It even has a slit cut into one side for tucking in the end of a roll of paper and holes where the paper rack used to sit. It's really small compared to a real desk, but it's versatile. It can reused in a multitude of ways. And you can't beat $15.
When my use for it outgrew it's tiny size, I just bought a $20 end table at a flea market that is the same height (exactly the same height, I got really lucky) and butted them against each other.
It's amazing what I can do on that tiny space. I do office-type work, drawing, crafts, sewing, everything. I think the key is having storage for all of your components that doesn't take up precious desk space.
i have the same desktop background as Gary from Germany!!!