You have three things to research. I'd suggest that first you review your condo rules and, further talk to the officers of the association and/or the management firm, if that is a different organization. Sometimes what you can do (on paper) you can't do without more trouble than itâ€™s worth. Second, you will have to talk to the town's building department. Most condos are structurally intermeshed and the town will have codes to follow, if they allow the construction at all. Finally, you are going to have to find an engineering firm to design an installation that the first two will accept. This will also give whomever is going to do the work proper drawings and specifications. You may be able to do it yourself if you've got the skill but it may be that even so, you will be forced to use a licensed contractor.
All of this requires time and money, so another thing to think about is the cost justification and what the time horizon that you have with this residency. It may all fall into place easily but each situation is unique.
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You own the condo and certainly have all the rights that go along with property ownership. However, CC&R's insert covenants, conditions and restrictions that may prevent you from doing things like combining two rooms. Certainly, your HOA could inform you too. If your HOA employs a management company, contact your HOA's representative there.
Talk the Property Manager and/or Resident Manager and how to proceed.