National calculation methodology (NCM) modelling guide for non-domestic buildings in Scotland. 2022 edition. V1.2 - February 2023

Publication Year

2023

Document Status

Current

Abstract

Provides guidance for complying with building regulations and applying the calculation methodology used for non-domestic buildings under standards 6.1 and 6.9 of the 2022 Non-domestic Technical Handbook. Indicates the main changes introduced with the 2022 NCM guide and looks at a notional building, detailing glazing types, building fabric, HVAC systems, auxiliary energy, lighting power density, then looks at the actual building and building fabric, lighting, energy, ventilation, shell buildings, modular and portable buildings and extensions to the insulation envelope. Also covers solar gains and energy performance certificates.

Document History

Partially replaces National calculation methodology (NCM) modelling guide for non-domestic buildings in Scotland. 2015 edition. V1.2 - April 2018 (Scottish Government, 2018). Building Standards Division. Applies to Scotland only. This guidance is applicable to work that is subject to a building warrant submitted on or after 1 December 2022. Version 1.0 - published June 2022 - Initial issue in support of the 2022 revision of section 6 (energy) of the Scottish building regulations. Version 1.1 - published August 2022 - Tables 7 and 8 and paragraph 72 updated to align efficiency of heating in HN notional building to match natural gas specification. Version 1.2 issued February 2023 - Differences in building regulations compliance and EPC calculations highlighted in new paragraphs 103 and 148. Confirmation of EPC calculation approach set out in paragraphs 169-172. Table 17, outer pane emissivity corrected. Table 18, all outer pane values updated..

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