The best source of this information is the Avalon Construction Office you can reach them by calling this Telephone number : (609) 967â€‘4220. They are located at 3100 Dune Drive.
If you need any further help, please contact me at:
Joanne Bernardini, SFR,CSSA
Coldwell Banker-Casa Bella Realtors
I just called the Tax Assessor in Avalon and confirmed that if you are in the 200 block of 25th Street, you need to have a 50'x110' lot to build a duplex. If you are on a 40'x110' lot you can build a single familt home, but would need a variance to build a duplex. Please let me know if I can help in any other way.