On April 10, 2026, OSHA activated a revised National Emphasis Program targeting outdoor and indoor heat-related hazards — and for the construction industry, the enforcement implications are immediate. The updated NEP runs through April 2031, identifies 55 high-risk industries using Bureau of Labor Statistics injury data from 2022 through 2025, and places construction — across residential, nonresidential, utility, highway, bridge, and specialty trade subcategories — squarely in its primary enforcement focus. The Department of Labor's April 10 announcement stated that the program is designed to "direct agency resources where they can make the biggest impact — focusing inspections and outreach in industries and workplaces where heat stress risks are most likely to occur."

Two Tracks: Enforcement Now, Rulemaking Later

The 2026 update reflects a deliberate two-track federal approach to heat safety. The first track is enforcement: the revised NEP is active, directing OSHA compliance officers to conduct proactive inspections during heat-priority days — defined as days when the National Weather Service issues a heat advisory or warning, or when the heat index reaches 80°F on a site. AlertMedia's June 2026 regulatory analysis reports that OSHA heat inspections have increased from roughly 200 per year under prior enforcement to approximately 2,400 per year under the revised NEP — now accounting for about 6 percent of all OSHA inspections nationally.

The second track is rulemaking — and it has stalled. OSHA's proposed Heat Injury and Illness Prevention in Outdoor and Indoor Work Settings rule, published in the Federal Register on August 30, 2024, concluded public hearings in July 2025 and closed its post-hearing comment period on October 30, 2025. As of June 2026, no finalization date has been set, and the rule is not a current administration priority under the January 2025 regulatory freeze. The proposed standard — which would have established written heat plan requirements, mandatory 15-minute paid rest breaks at high heat conditions, and specific trigger temperatures of 80°F and 90°F — remains in regulatory limbo.

The practical consequence: OSHA does not need a final rule to cite construction employers for heat hazards. The General Duty Clause of the Occupational Safety and Health Act — in effect since 1970 — requires every employer to provide a workplace free from recognized hazards likely to cause death or serious physical harm. OSHA has issued nearly 350 heat-related General Duty citations since 1986, and the revised NEP makes it significantly easier for inspectors to do so consistently. The National Law Review's May 2026 analysis of the revised NEP noted that two new appendices — Appendix I (a standardized 11-point heat plan evaluation checklist) and Appendix J (citation guidance) — have been added specifically to standardize and strengthen how inspectors identify violations and issue citations.

The Revised NEP's Key Changes for Construction

The Labor Beacon's June 2, 2026 analysis of the updated policy identifies several structural changes from the 2022 version:

• Industry targeting reduced and refined: The 2022 NEP covered approximately 79 industries; the 2026 version narrows to 55, with the reduction reflecting updated BLS injury data showing lower or higher heat risk by sector. Construction retained across all major subcategories.
• Numerical inspection goal removed: The 2022 NEP required OSHA officers to evaluate 100 percent of hazardous areas on a visited worksite. The 2026 version replaces this with a checklist-based evaluation (Appendix I) that focuses inspector attention on the heat program's existence, comprehensiveness, and communication rather than a site-coverage quota.
• Unprogrammed emphasis hazard coding added: Under the revised NEP, inspectors visiting a site for any reason — fall protection, trenching, equipment safety — are now specifically instructed to identify and code heat hazards simultaneously. A routine inspection can now trigger a full heat program audit.
• Acclimatization elevated as a citation trigger: Even without a final rule, OSHA inspectors are directed to treat the absence of documented acclimatization procedures as a primary basis for a General Duty citation. New workers performing high-intensity labor in peak sun conditions without a documented ramp-up program are a specific red flag.

What Construction Employers Must Have in Place

The Appendix I checklist that OSHA inspectors now use to evaluate heat programs includes 11 core elements. ABC Carolinas' detailed June 2026 compliance guidance identifies the key items inspectors are examining:

• A written, site-specific heat illness prevention plan that names a designated Heat Safety Coordinator and is updated for current project conditions
• Water access within 200 feet of active work — one quart of fresh, cool water per employee per hour as a baseline standard
• Shaded rest areas available once the heat index reaches 80°F, deployed and accessible within a two-minute walk from work areas
• Scheduled cool-down rest periods at 90°F heat index — including adjusted work schedules that move strenuous tasks to the coolest parts of the day
• Acclimatization documentation for new and returning workers — a structured ramp-up from 20 percent of full heat exposure on Day 1, increasing by no more than 20 percent per day, reaching full exposure on approximately Day 5
• Training records for both workers and supervisors covering heat illness recognition, early symptoms, and emergency response
• A documented emergency response plan that includes site coordinates for emergency vehicles, who calls 911, who guides EMS, and who initiates first aid

ABC Central Texas' analysis adds a sobering context note: construction workers are 13 times more likely to die from heat-related illness compared to workers in other industries. Between 1992 and 2016, 285 construction workers died from heat-related causes in the United States — accounting for more than a third of all U.S. occupational deaths from heat exposure over that period. Approximately 40 to 60 workers die annually from environmental heat exposure according to BLS data, though researchers widely believe the actual figure is significantly higher due to underreporting.

The State-Level Patchwork

In the absence of a finalized federal standard, several states have enacted their own heat regulations that apply to construction employers within their borders. California has both an outdoor heat illness standard (trigger at 80°F, enhanced measures at 95°F) and an indoor heat illness standard enacted July 2024 with an 82°F trigger. Nevada began enforcing a new rule in April 2025 requiring Job Hazard Analysis, written heat safety programs, monitoring, training, and a hierarchy of controls. Maryland and Oregon apply heat rules at an 80°F indoor heat index. Minnesota regulates indoor workplaces using wet-bulb globe temperature thresholds tied to task intensity.

For contractors operating in multiple states, the practical obligation is to know which state standards apply — and to maintain programs that would satisfy the most demanding applicable jurisdiction. Federal OSHA's General Duty Clause remains the baseline everywhere that a state OSHA plan has not enacted more specific requirements.

The Summer 2026 Risk Posture

For the construction industry, the combination of an active OSHA NEP, an elevated inspection rate, new citation standardization through Appendices I and J, and a summer heat season that is already underway creates a compliance environment where heat safety is not optional or deferrable. The National Law Review's analysis is direct: the focus must shift from "waiting for a rule to perfecting your implementation." A contractor without a documented, site-specific heat illness prevention program — including water, rest, shade, acclimatization, training, and emergency response — is exposed not only to citations but to civil liability if a heat-related fatality occurs on a site where the program was absent or inadequate. The cost of building a program is low; the cost of not having one has never been higher.

Sources

• U.S. Department of Labor / OSHA, April 10, 2026 NEP Announcement
• National Law Review, OSHA's 2026 Heat NEP Intensifies Enforcement (May 22, 2026)
• The Labor Beacon, OSHA Releases 2026 Heat-Hazard Policy (June 2, 2026)
• AlertMedia, OSHA Heat Regulations: What Employers Need to Know 2026 (May 29, 2026)
• ABC Carolinas, Essential Heat Illness Prevention Plan for Carolinas Construction (June 1, 2026)
• ABC Central Texas, Managing Heat Stress in Construction (May 28, 2026)