Prior to 2007, the Pennsylvania Mechanic’s Lien Law of 1963, 49 P.S. §1101-§1902 (the “Mechanic’s Lien Law”) operated for over 40 years in its original form, without any significant or substantive modifications. In 2007, however, amendments to the Mechanic’s Lien Law went into effect that significantly changed the statute. For example, the 2007 amendments changed, inter alia, the enforceability of upfront waivers and the definition of a “subcontractor.” In 2009, additional amendments to the Mechanic’s Lien Law went into effect which changed some of the 2007 amendments.