What LEED and WELL Actually Require for Diversion Documentation

Diversion rate is the most casually cited number in facilities sustainability and one of the most tightly specified in green building certification. The gap between those two facts is where certification submittals fail.

A hauler report saying "82% diverted" is not a diversion rate in the sense LEED means. LEED specifies what counts as diversion, what counts in the denominator, how many separate material streams you must demonstrate, and what documentation you have to produce. WELL, contrary to widespread assumption, does not set a diversion threshold at all. This post walks through what each one actually requires, credit by credit, from the published rating systems.

What does LEED require for construction and demolition waste?

Two things, and teams routinely conflate them. There is a prerequisite about planning and a credit about performance, and satisfying the prerequisite earns no points.

The prerequisite, in the LEED v4.1 Building Design and Construction guide, requires the project to "develop and implement a construction and demolition waste management plan" that establishes diversion goals "by identifying at least five materials (both structural and nonstructural) targeted for diversion," specifies "whether materials will be separated or comingled," and describes "where the material will be taken and how the recycling facility will process the material including expected diversion rates for each material stream." It then requires a final report "detailing all major waste streams generated, including disposal and diversion rates."

Read that last clause carefully. The prerequisite is not asking for a diversion percentage. It is asking you to name the receiving facility for each stream in advance, and to state what that facility does with the material. Most project teams cannot answer that on the day they write the plan, which is the actual reason the prerequisite creates friction.

What diversion percentage does LEED actually require?

The MR credit for Construction and Demolition Waste Management is worth 1–2 points, with four diversion pathways and a separate waste-reduction pathway. The stream counts are not decorative — they exist to stop a project claiming a high rate off a single commingled load.

The credit also permits an alternative that has nothing to do with diversion. Under Option 2, a project can earn 2 points by not generating the waste in the first place: "do not generate more than 7.5 pounds of construction waste per square foot (36.6 kilograms of waste per square meter) of the building’s floor area for all BD&C projects except warehouses," with a threshold of 2.5 pounds per square foot for warehouse projects, and salvage or recycling of at least 75% of renovation and demolition waste. If your project is a tight urban site where onsite separation is impractical, that pathway is often the more achievable one.

What counts as diversion, and what silently does not?

This is where reported rates and LEED-eligible rates diverge, and every exclusion below is stated in the rating system rather than inferred.

• Alternative daily cover does not count. The prerequisite states that "alternative daily cover (ADC) does not qualify as material diverted from disposal. Include materials destined for ADC in the calculations as waste." It stays in the denominator and leaves the numerator — the single most common source of an inflated hauler-reported rate.
• Land-clearing debris and excavated soil are excluded entirely. They are "not considered construction, demolition, or renovation waste that can contribute to waste diversion," and the credit directs teams to exclude them from calculations.
• Waste-to-energy does not count in the United States. The credit is explicit that it "is not considered an acceptable means of diversion for projects within the US," with a narrow alternative compliance path for international projects following the EU Waste Framework and Waste Incineration Directives.
• Wood-derived fuel does count. Combustion of wood materials resulting from recycling processing "is classified as an acceptable means of diversion for projects both in the US and internationally, and is not considered waste-to-energy for LEED Project diversion reporting purposes."
• Weight and volume cannot be mixed. "Calculations can be by weight or volume but must be consistent throughout." In practice, weight is the only basis that survives scrutiny across multiple haulers.

What does LEED require of the recycling facility itself?

For the certified-facility pathways, a great deal — and it doubles as the best published checklist for evaluating any hauler’s or MRF’s reported rate, certification aside.

LEED v4.1 requires that commingled material go to a facility "that has received independent third-party certification of their recycling rates," and specifies minimum requirements for the certifying organisation. Data submitted by facilities must be audited, and the audit must include "the evaluation of recyclable sales records, verification of facility sales into commodity markets, an assessment of downstream materials and how these materials are managed after they leave the site, monitoring off-site movement of materials, and a review of the facilities’ customers weight tags information." Site visits must "verify use and accuracy of scales including calibration frequency."

On the rates themselves: "measurements must be based on weight (not volume), using scales"; rates "must be available on a website and viewable by the general public"; and the final recycling rate "will include overall facility diversion rates with and without ADC/Beneficial Reuse," with wood-derived fuel reported separately from other waste-to-energy or incineration end markets. The rating system notes that the Recycling Certification Institute’s Certification of Real Rates protocol presently meets these requirements.

What does LEED require for an existing building in operation?

A different and, for a multi-site portfolio, more demanding thing: ongoing measurement rather than a project-duration report.

In the LEED v5 Reference Guide for Operations and Maintenance, MR Credit Waste Reduction Performance awards 1–12 points on a diversion scale that begins at 6% and runs to 80%. The measurement requirements are specific: calculate the rate "by tracking the total amount of materials generated from ongoing building operations and maintenance activities for a minimum of three consecutive months within the 12-month reporting period," tracking generation monthly and including "the material type and weight of all nonhazardous solid materials." For diverted materials you must "specify the diversion method (reduce, reuse, recycle, compost, etc.)."

Two clauses in that credit deserve attention because they set the evidentiary bar. Estimation is permitted but must be declared: "if material quantities are estimated, provide the methodology and/or source references used to make calculations." And volume conversion is a fallback, not a default: "if actual weights are unavailable for certain material types or hauling methods, volume-to-weight conversion average values can be used." A portfolio that weighs nothing and converts everything is compliant and is also leaving a documented estimation trail across every site.

The companion credit, MR Credit Waste Reduction Strategies, is worth a single point via one of three routes: implementing an organics recycling or composting programme, inventorying and labelling all collection infrastructure with staff training and a named waste prevention lead, or conducting "a zero-waste audit of all inbound and outbound materials at least once during the 12-month reporting period." The second of those is essentially a container right-sizing exercise, which is where operational cost and certification points happen to point the same direction.

What does WELL certification require for waste?

Much less than most sustainability teams assume, and something different in kind.

In the WELL v2 standard published by the International WELL Building Institute, waste appears as Feature X09, Waste Management, in the Materials concept — worth 1 point for WELL Certification and 2 for WELL Core. Its stated intent is to "mitigate environmental contamination and associated exposure to hazards present in certain wastes," and its scope is specifically hazardous and special wastes: "all batteries, pesticides, lamps that may contain mercury, other mercury-containing equipment (including thermostats and thermometers), and electrical and electronic equipment present or expected to be present within the project during the building operations."

For those materials it requires a waste management plan identifying roles, responsibilities and vendors; identifying "the sources of waste, estimation of rates of generation and strategies to minimize waste generation"; separate containment in clearly labelled receptacles removed from the building within one year; spill protocols; protocols for off-site shipment; and, notably, "protocols to track, measure and report waste stream flows."

The practical implication for a portfolio pursuing both certifications is that the two frameworks want different cuts of the same underlying record. LEED wants tonnage by stream by destination, aggregated to a rate. WELL wants a small set of hazardous and electronic streams tracked individually, with vendors and shipment documentation attached. A dataset built only to produce a diversion percentage cannot answer the WELL question, because the batteries and lamps were never broken out.

What documentation do you actually have to submit?

For the LEED v4.1 C&D credit, the required documentation is the "MR construction and demolition waste management calculator or equivalent tool tracking total and diverted waste amounts and material streams," plus documentation of recycling rates for commingled facilities where the certified-facility pathways are used. USGBC publishes the v4.1 C&D waste management calculator directly, and the current credit language for each rating system and version lives in the LEED credit library and the LEED v5 documentation. IWBI publishes the corresponding WELL v2 feature language in the WELL v2 standard.

What that documentation requires operationally is a record per load, not a summary per year. Weight from a scale. A stream tag from a per-site taxonomy that distinguishes source-separated commodities from commingled containers. A named receiving facility and what it did with the material. A timestamp that places the load inside the reporting period. Assemble those four attributes and every framework above is a query against the same table; assemble a spreadsheet of monthly diversion percentages instead and each certification becomes a separate archaeology project.

For completeness on tooling: Dyrt’s Impact Engine produces framework-shaped exports — LEED among them — from a single normalized dataset, and maintains the chain of custody from bin to receiving facility that a certification reviewer or assurance provider follows backwards. Where a site has no weighing infrastructure at all, a DWIT kiosk and industrial scale generates the weighed, timestamped, stream-tagged load record with a per-site configurable stream taxonomy, which is what lets a portfolio evidence stream counts rather than assert a percentage. For portfolios where the constraint is that nobody owns the process across sites, Portfolio Intelligence covers that. The same records feed the carbon side of the disclosure, which we walk through in our guide to Scope 3 Category 5 waste reporting. None of it changes what the rating systems require, which is the point of reading them directly.