The FHA maximum loan amount in Essex County NJ is $729,750 for a one family dwelling and up to $1,403,400 for a 4-family dwelling in Essex County NJ. You can click this link https://entp.hud.gov/idapp/html/hicostlook.cfm to find the maximum FHA mortgage limit in any area of the county.
Contractor Directory for the FHA 203(k) loan program
The loan limit for a 203k, which is an FHA loan is 729,740 on a single family. This for owner Occupied, and would include the renovations and the loan amount. I might recommend the best 203 k Lender I know, if you have more questions:
Residential home Funding