The NCC 2019 facade calculator assists in understanding and applying the NCC Volume One Part J1.5 Building fabric DTS Provisions, and the JV3 Verification Method (Verification using a reference building) for energy efficiency. The calculator is a MS Excel file containing multiple worksheets navigated via a customised ribbon and/or tabs and a final report of results can be produced. A help guide is available in the calculator and provides instructions on its use. This calculator has been created and designed for Excel 2010, and newer, for Windows. Compatibility with other versions and operating systems is not guaranteed. It requires macros to be enabled to function correctly. NOTE: There are some known issue with MS Office 365 ProPlus and MS Excel for Mac. Details are provided in the calculator. This calculator is for use with NCC 2019 Volume One.