Second. Accessibility. Is it off the living room? If not, it's value falls. Off the kitchen is ok too. If you need to go up a spiral stair or go through a bedroom think twice unless you know you will get the enjoyment.
As a note' depending upon your neightbors and condo rules the permit may cost more than the deck. Especially in a condo building you need to get permission from the executive board. They will likely need architectural drawings.
Make sure to get a permit if needed. That is the most important thing to take care of.
Adding a roof deck to your condo really doesn't add value to your condo. It's only valuable to the buyer who wants a roof deck in their condo. It's like putting a pool in a yard. A lot of home owners feel that because they added a pool and it cost them a nice chunk of change, that it must add value to their home. That is simply not true. It can actually hurt home owners.
If you are only adding the deck because you feel that it will add value to your condo, I would say not to do it. If you want a deck to enjoy while you live there, then put the deck on.
When you go to sell it, naturally you will list that it has a deck but it won't add anymore value. It actually creates more issues for a home inspection because is there are any issues with the deck, you will have to fix them or credit the buyer.
I hope this helps.
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