Also - when you say "turned... into an office." what exactly does that mean? Simply use that room as an office... or did actual alterations to the room/house.
Marketing considerations - yes, 4 beds is likely to have more appeal than less bedrooms.
So there's a few issues here, but not enough info about your particular situation that any of us here can give a definitive answer to.
Is the closet still there? Does it have a window and a door? If you are just using the actual bedroom as an office without making any changes to it, you can call it a 4th bedroom.
Are you looking to sell your home on your own as a For Sale By Owner? That is not a very good idea since there is so much to know and there are so many hurdles when selling your home. You should for sure have an agent look out for your best interest, give you the best advice and guidance throughout the transaction.
At our Company (Help-U-Sell), we charge a set fee for our services, as opposed to the traditional 6 percent commission, which, in turn, helps you to retain a greater amount of equity while still receiving all the real estate services you expect.
Our agents are fully licensed professionals, members of the local Board of Realtors and of the National Association of RealtorsÂ®, work with both Buyers and Sellers, and provide a full range of real estate services.
Help-U-Sell Achievers Realty
It would probably be best to have an agent look at the whole house and give you their marketing plan, including what to call the 4th bedroom.
Hope this helps!
Keller WIlliams Realty - Leesburg, VA