N.J. Stat. § 4:20-8
When a person after due notice shall fail to make or amend and maintain his part or proportion of a partition fence as required by section 4:20-7 of this Title, the other person may make or amend and maintain the same wholly, in which event he shall be entitled to receive, from the person so failing, the entire expense thereof, if he is not using his adjoining lands for the pasturage or keeping of animals, or if he is so using his adjoining lands, he shall be entitled to receive 1/2 of the expenses thereof, if the other person is using his adjoining lands for said purposes, as appraised and certified in writing by 2 disinterested members of the township committee where the lands lie, together with the legal fees of such committee for their services as ascertained in writing. Upon nonpayment by the delinquent person of the sum so found and the fees certified to be due, the other person may recover such sums, with costs of suit, in a civil action in any court of competent jurisdiction.
N.J.S. § 4:20-8