▁builder ▁agre es ▁to ▁build ▁and ▁serves ▁as ▁the ▁heart ▁of ▁the ▁contract . ▁On ▁Fast - Track ▁projects , ▁the ▁design , ▁construction ▁documents ▁and ▁specific ations ▁are ▁incomplete , ▁so ▁setting ▁the ▁final ▁cost ▁presents ▁problems . ▁To ▁deal ▁with ▁this ▁difficulty , ▁own ers ▁typically ▁use ▁a ▁cost - re imb urs able ▁contract ▁with ▁the ▁builder ▁( a ▁construction ▁manager ▁or ▁a ▁general ▁contract or ). ▁The ▁contract ▁may ▁include ▁a ▁cost ▁estimate ▁with ▁no ▁guarantee ▁or ▁there ▁may ▁be ▁a ▁Gu arante ed ▁Max imum ▁Price ▁( G MP ). ▁However , ▁even ▁with ▁a ▁G MP , ▁there ▁can ▁be ▁argument ▁over ▁the ▁scope ▁of ▁work ▁covered ▁by ▁the ▁G MP ▁since ▁the ▁design ▁was ▁incomplete ▁when ▁the ▁contract ▁was ▁executed . ▁ ▁There ▁is ▁also ▁a ▁risk ▁that ▁work ▁built ▁in ▁an ▁early ▁phase ▁of ▁the ▁project ▁may ▁not ▁suit ▁later ▁design ▁dec isions . ▁For ▁instance , ▁if ▁the ▁building ▁shape ▁changes ▁after ▁the ▁found ations ▁are ▁built , ▁there ▁is ▁increased ▁cost ▁and ▁delay ▁to ▁modify ▁the ▁completed ▁found ations . ▁Or ▁an ▁item ▁of ▁equipment ▁that ▁is ▁selected ▁late ▁in ▁the ▁process ▁may ▁require ▁dra ins ▁or ▁water ▁and ▁power ▁connections ▁that ▁were ▁not ▁anticip ated ▁early ▁in ▁the ▁project . ▁Furthermore , ▁the ▁interpretation ▁of ▁the ▁design ▁brief ▁from ▁the ▁contract or ▁may ▁differ ▁from ▁the ▁owner ▁which ▁can ▁result ▁in ▁a ▁conflict ▁of ▁interest . ▁ ▁If ▁time ▁is ▁not ▁cru cial , ▁own ers ▁may ▁take ▁a ▁pr udent ▁approach