LEED Prerequisites Explained: The Mandatory Green Building Requirements
LEED Prerequisites Explained: The Mandatory Green Building Requirements
When designing a sustainable building, it's easy to focus on high-scoring, glamorous technologies like solar arrays and rainwater treatment centers. However, before a project can pursue any points, it must clear the entry gates of the LEED framework. These gates are known as **Prerequisites**.
Unlike credits, which are optional and worth points, prerequisites are mandatory and carry **zero points**. They represent the non-negotiable minimum performance thresholds. Failure to meet a single prerequisite will disqualify the entire project from certification, regardless of how many other points it has accumulated. Let's look at why they exist and examine the key prerequisites in each LEED v4 category.
Why Are Prerequisites Required?
The USGBC established prerequisites to ensure that a certified green building meets a basic level of responsibility in every core area. For example, a developer cannot build a highly energy-efficient structure that ignores indoor air quality or site-level pollution. The prerequisites establish a balanced baseline across all environmental dimensions.
Prerequisites by Core Category (LEED BD+C)
Sustainable Sites (SS)
- Construction Activity Pollution Prevention: Requires projects to create an ESC (Erosion and Sedimentation Control) plan to prevent soil erosion, dust, and water pollution during construction.
Water Efficiency (WE)
- Outdoor Water Use Reduction: Requires a minimum 30% reduction in irrigation demand compared to a baseline.
- Indoor Water Use Reduction: Requires a 20% reduction in indoor water usage (flush/flow fixtures).
- Building-Level Water Metering: Installing permanent water meters to track monthly consumption.
Energy & Atmosphere (EA)
- Fundamental Commissioning and Verification: Hiring a Commissioning Authority (CxA) to check HVAC, plumbing, and electrical systems.
- Minimum Energy Performance: Establishing an energy model (ASHRAE 90.1 standard) to prove the building beats baseline energy performance.
- Building-Level Energy Metering: Installing utility-grade meters to record energy consumption.
- Fundamental Refrigerant Management: Complete ban on using CFC-based refrigerants in the building's HVAC and refrigeration systems.
Materials & Resources (MR)
- Storage and Collection of Recyclables: Allocating dedicated space in the building for sorting and recycling paper, glass, plastic, metal, and cardboard.
- Construction and Demolition Waste Management Planning: Drafting a plan to recover and reuse building materials.
Indoor Environmental Quality (EQ)
- Minimum Indoor Air Quality Performance: Designing ventilation systems that satisfy ASHRAE 62.1 standard.
- Environmental Tobacco Smoke Control: Complete ban on indoor smoking (and within 25 feet of building entries).
How to Verify Compliance
To satisfy GBCI reviewers, the project team must submit specific audit evidence for each prerequisite. For example, for the **Construction Activity Pollution Prevention** prerequisite, the team must submit photos of sediment fences, hay bales, and dust suppression activities during construction. For **Minimum Energy Performance**, they must submit the complete energy modeling input and output sheets.
For a clear comparison of how these mandatory requirements differ from points-yielding credits, see our guide on LEED Credits vs Prerequisites.
Frequently Asked Questions
Do LEED prerequisites earn any points?
No, prerequisites earn zero points. They are strictly baseline requirements that must be met to make the project eligible for certification.
What happens if a project fails to meet a prerequisite?
If a project fails to meet even one prerequisite, it cannot be certified under the LEED rating system, regardless of how many credits or points it has earned.
Are prerequisites identical for all LEED rating systems?
No. While they share core themes (like energy performance and waste planning), prerequisites are adjusted for different rating systems (e.g. BD+C vs O+M or ND for Neighborhood Development).
Is refrigerant management mandatory in LEED?
Yes, under the Energy & Atmosphere prerequisite, projects must show they do not use CFC-based refrigerants in new installations, or must implement a phase-out plan for existing installations.
Can I request a waiver for a prerequisite?
No. The USGBC does not grant waivers for prerequisites. Every project must comply with all prerequisites to establish its baseline eligibility.