The WELL Building Standard, a certification mark of the International WELL Building Institute, uses performance verification to test whether selected physical conditions in a completed building satisfy the scheme rather than relying on design documents alone. For full certification, the process has two distinct stages: a WELL Performance Testing Agent working for an approved Performance Testing Provider conducts the on-site work, and a separate WELL Reviewer assesses the submitted results together with the project documentation and determines whether each feature is achieved.
Drawings, specifications, calculations and commissioning records describe what a project intended to provide and how systems were designed or set up. They are essential evidence for many requirements, but they do not necessarily show the physical conditions present in an occupied space at the time of verification.
Buildings can change between design and operation through substitutions, adjusted controls, altered system behaviour and actual patterns of use. Performance verification introduces a direct check on selected conditions after the project has become a functioning place.
The scheme owner describes performance verification as an on-site third-party assessment combining performance testing, on-site photographs and independent review. Its purpose is to connect documentary evidence with real-world data from the project.
This does not make documents unimportant. The reviewer still needs the project's technical and operational evidence to understand scope, applicability and the requirements that are not demonstrated by measurements. Performance verification complements documentation; it does not replace the whole documentation review.
The process separates data collection from the formal review decision. In the first stage, the Performance Testing Agent plans and conducts the required on-site work, manages the resulting data and arranges any necessary laboratory analysis through the approved provider's quality system.
In the second stage, the WELL Reviewer examines the performance results alongside the submitted project documentation. The reviewer records whether the relevant feature is achieved, whether further information is needed or whether the evidence remains insufficient. The reviewer is not the person who attended the site to take the measurements.
This separation is central to understanding the scheme. The testing agent produces and quality-controls the performance evidence; the reviewer makes the independent feature-level judgement within the review process. Describing the testing visit itself as the certification decision collapses two different roles into one.
The distinction also prevents overstatement at the end of a site visit. The agent may discuss whether access was available, whether testing was completed and whether results indicate a need for retesting, but formal achievement is established only through the subsequent review of the full evidence package.
A WELL Performance Testing Agent is the individual responsible for conducting the on-site performance testing required by the project's selected features. The agent must work for an approved Performance Testing Provider, and testing by an individual outside that recognised provider structure cannot be used for full certification.
The agent reviews project information, confirms the testing scope, collects data, documents site conditions, manages applicable samples, applies quality controls and uploads performance evidence for review.
The agent may identify results that do not satisfy the relevant requirement and arrange retesting after the project has taken corrective action. That practical screening does not turn the agent into the final scheme decision-maker. The formal status of the feature remains subject to the WELL Reviewer's assessment.
The project team must support the visit by providing access, accurate project information and a representative who can coordinate with facilities management. The agent should not be treated as a consultant who redesigns the building or recommends corrective measures while acting in the independent testing role.
It is incorrect to state that the certification body always assigns the testing agent. For v2 projects, a project may contract an approved Performance Testing Provider directly. The scheme also offers a coordination route through which the provider arrangement can be organised, but that option does not remove the direct-contract pathway.
Where the project contracts directly, it selects a recognised provider and agrees the commercial and logistical arrangements with it. The provider supplies an eligible Performance Testing Agent for the work.
Where coordination is requested through the scheme owner, the administrative route is different, but the technical role remains with a Performance Testing Agent employed by an approved provider. The important point is that provider approval and agent eligibility are requirements of the scheme, while the route used to arrange the appointment can vary.
Early engagement can help the project understand access requirements, likely dependencies and the information needed before testing. It should not, however, blur the agent's independent role. The provider conducting verification should remain separate from project-side advice that could create a conflict with objective testing.
The WELL Reviewer is a separate third-party individual responsible for reviewing the project's documentation and performance-testing results against the requirements of the scheme. The reviewer does not simply receive a pass statement from the testing agent and reproduce it. The reviewer examines the submitted evidence at feature level.
This review brings physical data and documentary evidence together. A measured result may demonstrate one part of a feature while technical or operational records demonstrate another. The reviewer assesses the combined submission.
Where evidence is incomplete or unclear, the reviewer can issue comments or request clarification through the review process. The project may then amend documentation, provide further material or complete retesting as appropriate before the final outcome is established.
The formal decision about achievement therefore sits with the reviewer's assessment, not with the fact that a test was performed. A completed visit proves that data collection occurred; it does not by itself prove that every relevant feature has been achieved.
The two-role arrangement creates a basic separation of functions. The testing agent is accountable for competent, traceable collection and submission of site evidence. The reviewer is accountable for impartial evaluation of that evidence together with the project's other documentation.
This structure reduces the risk that the same person both generates the decisive data and makes the final feature determination. It also gives the review process a consistent point at which documentary and performance evidence are considered together.
Independence does not mean the roles never communicate through the project platform or review comments. Questions may need clarification, and the testing agent may need to provide supporting records. The separation concerns decision-making responsibility, not an absence of procedural contact.
Project teams should reflect the distinction in meeting notes and reports. Statements such as the agent certified the building or the tester awarded the feature are inaccurate. The agent tests and submits; the reviewer assesses and determines achievement through the scheme's review process.
Performance verification occurs after the project has reached the state required for testing. Construction completion, occupancy, building operation, access and the availability of project information can all affect whether the on-site stage can proceed as planned.
The project programme should therefore connect design completion, commissioning, fit-out, occupancy planning and facilities readiness with the testing window. Treating performance verification as a paperwork task at the end of certification can create delay if the building is not operating in a representative or accessible condition.
Handover also matters because the facilities team often becomes the practical host for the site visit. It may need to provide access, explain control arrangements, coordinate temporary operational actions allowed by the protocol and confirm that normal conditions are in place.
The neighbouring pages explain the two current annual ratings, map the concepts and quantities measured on site, and present the separate air-quality thresholds without repeating those subjects here.
This website is an independent information resource with no affiliation, endorsement, accreditation, partnership, assessor, provider or agency status under the scheme. It does not undertake performance verification, provide testing under the scheme, review submissions or make certification decisions.
The explanation summarises the process in original language and does not reproduce protected guidebook content. Current project requirements, provider eligibility, testing protocols and review procedures remain governed by material issued by International WELL Building Institute pbc.
An independent resource. WELL is a certification mark of the International WELL Building Institute pbc. No affiliation, endorsement or accreditation.
On-site testing checks selected physical conditions in the completed building. It adds real-world evidence to the design, construction and operational documents reviewed under the scheme.
A WELL Performance Testing Agent working for an approved Performance Testing Provider conducts the required on-site performance testing. The project may contract an approved provider directly for a v2 project or use the available coordination route.
No. The agent collects, evaluates and submits performance evidence and may identify a need for retesting. A separate WELL Reviewer assesses the results with the project documentation and determines whether each feature is achieved.
No. A v2 project may contract an approved Performance Testing Provider directly. Coordination through the scheme owner is another available route, not the only route.
Yes. Performance results are assessed alongside the project's submitted documentation. Physical testing demonstrates selected conditions, while other evidence addresses scope, design, policy, operation and feature requirements not established by the measurements alone.
No. Completion of the visit confirms that the on-site work occurred. Formal achievement depends on the subsequent review of acceptable results and supporting documentation.
This site is an independent information resource. It is not affiliated with, endorsed by, accredited by or authorised by the International WELL Building Institute pbc, which owns the WELL certification mark, and it is not a certification body, an assessor, a performance testing provider or a scheme partner. Nothing on this page can certify, assess or award anything under the scheme, and nothing here is a substitute for the scheme's own published documentation. Requirements are summarised factually rather than reproduced; where a numeric threshold is stated it is drawn from documentation the scheme's owner publishes openly, and the specific figure is cited rather than the table it sits in. Certification under the scheme is voluntary and is not required by any authority in the United Arab Emirates.