(a)(2) A nonavailability determination is not required for construction materials listed in FAR 25.104(a). For other materials, a nonavailability determination shall be approved at the levels specified in 225.103(b)(ii). Use the estimated value of the construction materials to determine the approval level. A nonavailability determination is not required before January 1, 2030, if there is an offer for foreign construction material that exceeds 55 percent domestic content (also see FAR 25.204(b)(1)(ii) and (b)(2)(ii)).