N.Y. Town Law § 305
If any person who is liable to contribute to the erection or repair of a division fence shall neglect or refuse to make and maintain his proportion of such fence, or shall permit the same to be out of repair, he shall be liable to pay the party injured all such damages as shall accrue thereby, to be ascertained and appraised by any two fence viewers of the town, and to be recovered with costs. The appraisement shall be reduced to writing, and signed by the fence viewers making it. If such neglect or refusal shall be continued for the period of one month after request in writing to make or repair the fence, the party injured may make or repair the same, at the expense of the party so neglecting or refusing, to be recovered from him with costs.
N.Y. Town Law § 305