New Jersey municipalities enter the COAH process voluntarily. They do so by petitioning COAH for substantive certification of a housing element (required by the Municipal Land Use Law as part of each municipality's master plan) and a fair share plan establishing a realistic opportunity for the provision of housing affordable to low and moderate income households directly related to certificates of occupancy issued for residential and non-residential market rate development.
Petitioning assures continued protection from lawsuits while COAH reviews, sometimes requests revisions and possibly mediates objections from interested parties before COAH grants or denies substantive certification. Certification is granted for a ten-year period and may be withdrawn if a municipality fails to assure the continuing realistic opportunity for its fair share housing obligation.
A portion of the fair share obligation is the rehabilitation of existing units. To provide a realistic opportunity for the construction of new units, municipalities may zone specific sites for residential developments by the private sector. Developers must agree to build a fixed percentage of affordable units---usually 20 percent---of the total constructed on the site, to market to low and moderate income households and to maintain affordability for 30 years.
Other methods for meeting the obligation include municipally sponsored construction using for-profit or nonprofit builders, the purchase of existing units for sale or rent to eligible householders, the creation of accessory apartments within existing structures, and the provision of supportive and special needs housing including group homes for the physically handicapped or developmentally disabled.


