This section applies to any new building or facility proposed to be constructed specifically as a place of public accommodation on or after January 1, 1992. This section also applies to any single enlargement of an existing building or facility which enlargement is proposed to be constructed on or after January 1, 1992, if the cost of such enlargement exceeds 25 percent of the fair market value of the real estate and building or facility situated thereon but only to the portion thereof which is so enlarged. Facilities subject to this section shall meet the requirements of the New Hampshire code for barrier-free design established pursuant to N.H. Rev. Stat. § 275-C:14-17. This section shall also be enforced by the building inspector as provided in N.H. Rev. Stat. § 676:11-13.