The following acts of legislation or Executive Orders have amended the Highlands Act:

• P.L.2010, c.70 (Sept. 9, 2010): Extends expiration date of special appraisal process for Green Acres and farmland preservation programs from 2009 to 2014 for lands in the Highlands Region.
• P.L. 2010, c.7 (May 5, 2010): Authorizes any municipality outside the Highlands Region to establish receiving zones for Highlands Transfer of Development Rights program.
• P.L. 2010, c.4 (April 22, 2010): Exempts solar panels from impervious surface or impervious cover designation.

• Executive Order #114 (Sept. 5, 2008): Required the Highlands Council and other State agencies to coordinate implementation of the Highlands Regional Master Plan. It also required the Highlands Council and Council on Affordable Housing to enter into a Memorandum of Understanding and provided $10 million in initial funding to the Highlands Development Credit Bank.