Yes, you can sell a house with unpermitted work, and you are required to disclose to buyers any known unpermitted work done on your house, even if it was done by previous owners.
If an inspector catches any unpermitted changes on their own, the consequences may be more severe. Your home could get “red-flagged” for a code violation, which may result in a hefty monthly fine until you resolve the issue.
Once the designs for your unpermitted space meet building code, you can apply for a retroactive permit. You'll need to submit all drawings and documentation of the space. Retroactive building permits are special permits that are issued for structures which did not initially receive a building permit.
You may subject yourself to penalties and/or fines of up to $2,000 a day until permits are issued. If you proceed with your construction project without having a required permit and you get “caught,” before a permit can be issued you will need zoning approval and you may need a variance or planning board approval.
In order to obtain a Certificate of Occupancy the following criteria must be met, and related documents received by the Paramus Building Department. Please Note: Occupancy without a Certificate is a violation of the Uniform Construction Code and is subject to a penalty of up to $2000.