You require a "housing need", i.e. you do not own or have not owned a house in the rural area in the previous 5 years. This excludes residences owned in the urban areas, which I'm guessing is where your apartment is located.
Also, in making a planing application in joint names, only one applicant needs to provide a rural housing need. If your husband can supply qualifying documentation, then that is sufficient.
So based on your info, you owning an apt won't hamper you as you husband will be the qualifying person in the application.
Double-check what zone the site is situated in as the new County Development Plan came into force at the end of October 2015 and there have been changes in relation to Zone 1 and Zone 6. You would be unlikely to get permission in those zones.