Faille was interested in the local architectural tradition. In 1917, he took part in a competition launched by S.A.D.G.( Société des architectes diplômés par le gouvernement ) for the establishment of typical models of homes and farms for the devastated Somme region. His idea was of a large Picardy farm at the heart of a commune. In the days following the end of the World War I, in accord with the territorial divisions allotted for reconstruction, he was assigned to the cantons of Roisel and Combles, where he designed and built many new schools, churches and town-halls.