September 2026

Top 5 fire testing laboratories in the United States

Of the 13 fire testing laboratories in the United States listed in the OpenFire directory in September 2026, these profiles were viewed most by people and AI assistants.

  1. #1

    Jensen Hughes logo

    Jensen Hughes

    Fire safety experts at the forefront of hazard prevention.

    Consultancy 21–100 people 73 offices
    Building safety disputes CFD modelling Compartmentation +13 more
    Helsinki, Uusimaa · HQ View firm
  2. #2

    Southwest Research Institute logo

    Southwest Research Institute

    One of the largest fire research organisations in the world.

    Testing & certification 100+ people 1 office
    Fire resistance testing Reaction to fire testing Smoke & toxicity testing
    San Antonio, Texas View firm
  3. #3

    Guardian Fire Testing Laboratories logo

    Guardian Fire Testing Laboratories

    Fire testing, inspection and product certification under one roof.

    Testing & certification 6–20 people 2 offices
    Product certification & approvals Fire resistance testing Reaction to fire testing
    Buffalo, New York · HQ View firm
  4. #4

    Intertek logo

    Intertek

    Four full-service fire laboratories in North America.

    Testing & certification 100+ people 5 offices
    Product certification & approvals Fire resistance testing Reaction to fire testing
    Elmendorf, Texas · HQ View firm
  5. Joint #5

    ICC Evaluation Service logo

    ICC Evaluation Service

    Evaluation reports the model codes are read against.

    Testing & certification 100+ people 3 offices
    Product certification & approvals Fire resistance testing
    Brea, California · HQ View firm
  6. Joint #5

    NGC Testing Services logo

    NGC Testing Services

    Full-scale fire, acoustic and building-envelope testing at Buffalo.

    Testing & certification 21–100 people 1 office
    Fire resistance testing Reaction to fire testing
    Buffalo, New York View firm

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How the rankings work

Firms are ranked by how often their OpenFire directory profile was viewed during the calendar month, by people and by AI assistants. Search-engine crawlers, other automated traffic and link previews are not counted. Firms with equal views share a rank.

A firm with offices in several countries, or working across several categories, is ranked in each of them on the same monthly total. A ranking is only published where enough firms are listed and viewed for it to be meaningful.

A ranking reflects interest in a firm's listing. It is not an endorsement, and it is not a check of a firm's competence, certification or accreditation.