In the negotiations to form a "Grand Coalition" of the Christian Democrats (CDU together with the Bavarian CSU) and the SPD under the leadership of Chancellor Angela Merkel following the 2013 elections, Heil was part of the CDU/CSU delegation in the working group on the environment and agriculture, led by Katherina Reiche and Ute Vogt. In similar negotiations following the 2017 federal elections, she was part of the working group on internal and legal affairs, led by Thomas de Maizière, Stephan Mayer and Heiko Maas. Since 2018, she has been serving as chairwoman of the Committee on Building, Housing, Urban Development and Local Government.