The present invention is a housing for a surface-mountable device such as a security device (a PIR, a microwave motion detector, and the like). The housing has a surface-mountable housing portion with at least one aperture for receiving a surface-mounting member therethrough, the housing portion fabricated substantially from a plastic material. A member-retaining portion is integrally molded with the housing portion and extends substantially perpendicular from said housing portion, said member-retaining portion adapted to receive a surface-mounting member when inserted therethrough and retain said surface-mounting member in place. As a result of this configuration, when a surface-mounting member such as a screw is inserted therethrough, the surface-mounting member is held in place by the member-retaining portion and is insertable through the aperture when pressure is applied thereto. Preferably, the aperture is circular and the member-retaining portion is substantially cylindrical with at least one slot extending along said member-retaining portion. The member-retaining portion is adapted so as to allow a user to push a surface-mounting member therethrough and to hold the surface-mounting member in place. The member-retaining portion is compressible and/or collapsible so that when a surface-mounting member is inserted therethrough so as to force the surface-mountable housing portion against a wall, the member-retaining portion is substantially compressed and/or collapsed between a head portion of the surface-mounting member and the housing portion.