Calgreen Section 5.105.1 “Scope” for Existing buildings

Written By matias santini

In a Nutshell If you're altering or adding to a big building (100,000 sq ft or more), you need to make sure your project is environmentally friendly by either reusing a significant part of the existing structure, proving a reduction in environmental impact, or following specific sustainability measures.

If you're working on an existing building where the altered or added floor area totals 100,000 square feet or more, this section applies to you.

If you're working on a large building project (over 100,000 sq ft), you need to make sure it's environmentally friendly by:

  • Reusing a significant portion of the existing building,

  • Showing that your project will reduce environmental harm,

  • Or following specific eco-friendly building practices listed in the code (tables).

Choose One of Three Options: Your project must comply with one of the following sections to meet sustainability and environmental impact requirements:

1. Section 5.105.2 - Reuse of Existing Building:

  • Keep at Least 45% of the Existing Structure: You must maintain at least 45% of the building's main structural components and enclosure. This includes foundations, columns, beams, walls, floors, roof framing, wall framing, and exterior finishes.

  • Exclusions: Windows, insulation, parts deemed unsafe, or hazardous materials (that are being fixed) don't count toward this 45%.

2. Section 5.409.2 - Whole Building Life Cycle Assessment:

  • Conduct an Environmental Impact Study: Perform a comprehensive analysis of the building's environmental impact from creation to disposal (excluding energy used during operation).

  • Achieve a 10% Reduction in Global Warming Potential (GWP): Show that your project reduces GWP by at least 10% compared to a standard building of similar size and function.

  • Use Approved Methods and Software: The assessment must follow specific international standards (ISO) and use consistent data sets and tools for both your building and the baseline comparison.

3. Section 5.409.3 - Prescriptive Measures to Reduce Life Cycle Impact:

  • Implement Specific Sustainability Measures: Follow a set list of actions (found in Table 5.409.3) designed to reduce the building's environmental impact.

  • Examples May Include: Using recycled materials, choosing low-impact construction methods, or incorporating energy-efficient designs.

Table 5.409.3 product GWP limits - Up.Codes

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