We’re seriously considering making an offer on a detached 3-story house. I wrote last week about whether it would be advisable to try to rent out the existing third-floor apartment in this legally one-family house, without changing the C of O. The consensus of opinion seemed to be, “Don’t do it!”

The zoning permits 2 family dwellings. The question is: If we buy this house, what is involved in changing the C of O from 1 to 2 family? I understand that we have to hire an architect to file the paperwork, but would like to get an idea of what alterations usually have to be made to bring a second apartment up to code. There is already a separate exterior entrance and enclosed separate stairway to the third floor. There is a full bath, and a full kitchen. What required changes would we have to make, if any? Last: How long does it usually take to get a change of C of O through the city’s bureaucratic maze? We would be losing the rent for this apartment until it was approved.

All these issues will affect what we might be willing to offer for the house. Your advice is greatly appreciated.


What's Your Take? Leave a Comment

  1. did you ever find out the answer about converting a single family CofO into a 2 family? I’m in the same situation with the house I’m buying… thanks!

  2. did you ever find out the answer about converting a single family CofO into a 2 family? I’m in the same situation with the house I’m buying… thanks!

  3. If you are financing the deal, it might be hard to close if it is a legal one family set up as a three. Banks are not letting these things slide by like they did in the past.

  4. Without looking at it hard to tell, but you will need a fire rated separation inbetween the two units. Legalize what work was not illegally and you may be on the hook for additional parking if required.