Career
Castrilli"s father, Antonio, arrived in Australia in 1952 from after migrating from Roccamandolfi in Italy, he was joined by the rest of his family in 1954. Contesting the seat of Bunbury for the first time in the 2005 election Castrilli beat the sitting Labor member with a swing of +0.6 points and winning the seat by 0.4 points. He immediately became a shadow minister under leader Matt Birney, serving in the Local Government and Regional Development shadow portfolio from March 2005 to May 2005.
After the defeat of the Labor government at the 2008 election, he was appointed to the Barnett Ministry and became Minister for Local Government, in which role he has handled a controversial proposition to amalgamate smaller local councils.