On Friday, December 11, 2015 the Department of Consumer and Regulatory Affairs (DCRA) issued Administrative Bulletin on the Underpinning of Party Walls shared with attached or semi-detached one and two-family dwellings and notification of adjoining property owners of Construction Work.

Administrative code C2015-01: Underpinning of Party Walls shared with attached or semi-detached one and two-family dwellings
This document sets forth procedures and requirements for the filing, review, approval, and documentation of underpinning details, and for special inspection of construction projects that (a) share a Party Wall with an attached or semi-detached one and two-family dwelling and (b) are not subject to the special inspection requirements of Chapter 17 of the Building Code.

Administrative code C2015-02: Notification of adjoining property owners of Construction Work
This document sets forth procedures and requirements for notification of owners of one-family or two-family dwellings or townhouses in Residence, Special Purpose and Mixed-Use Districts by parties undertaking construction work on adjoining premises.