2013 Heritage Significance: 20 Helen Street Sefton 20 helen Street Sefton is an original weatherboard cottage, probably of the Hudson Ready Cut variety. LandscapeSydney - WesternResearch Author: Dr Sue Rosen, Historian and Heritage Consultant Client: Bankstown City Council 20 Helen Street, Sefton - it's a Rarity in the Bankstown LGA This cottage had been identified in a 2011 study as being of local heritage significance under heritage criteria. The purpose of the study was to assess the rarity or otherwise of the cottage at 20 Helen Street, Sefton. A literature review was carried out that related to the development of Bankstown and to identify the type of housing that typified the 1920's and 1930's. Informed by this, a survey was undertaken in suburbs where it was thought that similar houses might be located.