Green Building

A building that produces as much renewable energy as it consumes over the course of a year, resulting in zero net energy consumption from the utility grid. This is achieved through a combination of extreme energy efficiency measures and on-site renewable energy generation.

Leadership in Energy and Environmental Design is the most widely used green building rating system in the world. Developed by the U.S. Green Building Council, it evaluates buildings on a points-based system across categories such as energy, water, materials, indoor quality, and innovation, awarding Certified, Silver, Gold, or Platinum levels.

A rigorous voluntary standard for energy efficiency in buildings that reduces the structure's ecological footprint. Passive House buildings achieve ultra-low energy use for heating and cooling through superinsulation, airtight construction, high-performance windows, thermal bridge-free design, and heat recovery ventilation.

The physical barrier between the conditioned interior of a building and the unconditioned exterior environment, including walls, roof, foundation, windows, and doors. A well-designed envelope minimizes unwanted heat transfer, air leakage, and moisture infiltration.

The total greenhouse gas emissions associated with the extraction, manufacturing, transportation, installation, and end-of-life disposal of building materials, as distinct from the operational emissions produced during a building's use phase.

The intentional use of natural light to illuminate building interiors through the strategic placement and sizing of windows, skylights, light shelves, and reflective surfaces. Effective daylighting reduces electric lighting loads and improves occupant comfort and productivity.

The collection and treatment of gently used wastewater from sinks, showers, and laundry for reuse in non-potable applications such as toilet flushing and landscape irrigation. Greywater systems reduce total potable water consumption in buildings.

A building roof that is partially or fully covered with a waterproof membrane, growing medium, and vegetation. Green roofs reduce stormwater runoff, provide insulation, mitigate the urban heat island effect, and can extend roof membrane lifespan by protecting it from UV radiation and temperature extremes.

A systematic methodology for evaluating the environmental impacts of a building or building product across its entire life span, from raw material extraction through manufacturing, construction, operation, and end-of-life. LCA quantifies impacts such as carbon emissions, water use, and resource depletion.

The conditions inside a building that affect the health, comfort, and productivity of occupants, including air quality, thermal comfort, lighting quality, and acoustics. Green building standards require attention to IEQ through ventilation, material selection, and design strategies.