Job hazard assessment: 6 key steps for construction teams

With supervisors already having to juggle overseeing multiple crews, sites, and construction tasks, it’s easy for hazard management to slip through the cracks. But taking the time to document dangers before a job starts helps identify risks and resolve them before an accident happens.

A job hazard assessment, sometimes referred to as a job hazard analysis (JHA) or a job safety analysis (JSA), is a structured review that safety officers use to document workplace hazards. The idea is to break down every task during construction projects, closely analyze them for potential risks, and let crew members know what to do if something goes wrong.

This construction-focused guide will focus on how to apply JHAs to real workflows and stay consistent across jobsites and crews.

What is a job hazard analysis? How JHAs apply to construction workflows

A JHA is a document that safety officers and supervisors use to detail potential workplace hazards. While these documents require a time and research investment, they help managers inform workers of risks and prevent accidents and injuries. A copy of JHA documents should always stay on-site so everyone understands the protocols to follow if an accident happens.

Contractors can build JHAs into their entire workflows, from pre-task planning to debriefs. For example, in a pre-shift briefing, supervisors might use JHAs to tell workers about the day’s risks and what to expect. Or in a debrief, safety officers could share any incidents that happened during the shift and how to avoid them in the future. 

JHAs also help crews coordinate when multiple trades are working on a site at the same time. If a crane is due to operate near active crews, for example, supervisors can use the JHA to warn nearby workers about overhead loads and swing radius before lifts begin.

Keep in mind that the Occupational Safety and Health Administration (OSHA) doesn’t mandate JHAs, but Section 5(a)(1) of the OSH Act states that employers must keep workplaces free of recognized hazards. A JHA is the primary way that most companies provide evidence of this.

JSA examples: Key elements of a job hazard assessment

Most JHAs include similar information, but the exact contents will depend on the workplace. Here are some construction-specific examples.

Task breakdown by construction activity phase

Workers need to know when and where to expect each hazard. Contractors should start by breaking down each task’s steps and identifying which dangers might arise. For example, rather than simply writing down “run electrical wiring,” go into more detail, adding “place outlets and switches,” “drill into studs,” and “install nail plates.” Then, carry out a separate hazard assessment for each step. 

Tool and equipment risk review

Individual tools and pieces of equipment pose their own hazards. List everything crews might need for each task and the risks of operation for each item. The list for a forklift, for example, might include a chance of faulty brakes, tip-overs, and uncontrolled rolling.

Structural and environmental conditions

Site conditions and potential layout changes can affect risk just as much as individual jobsite tasks. JHA forms should have space for each. For example, note scaffolding and other temporary structures, work-at-height areas, and the impacts of weather exposure.

Controls structured by the Hierarchy of Controls

While OSHA doesn’t mandate that contractors complete JHAs, the agency does offer some guidance on what to include. The Hierarchy of Controls, for example, ranks safeguarding efforts by effectiveness. From most to least effective, these are:

• Elimination: Removing a hazard entirely makes it a nonissue, which is why elimination controls are at the top of the list. For example, a rooftop inspection might be a fall risk, but sending a drone with a camera instead of a person would completely nullify this danger.
• Substitution: Some processes and materials are more dangerous than others. Replacing them with less hazardous versions, like substituting a corrosive cleaner with a safer one, can lower risk significantly. 
• Engineering: Engineering controls involve adjusting processes to block or otherwise physically avoid a hazard. Common examples include placing machine guards on saws or making sure areas with airborne contaminants have exhaust ventilation. 
• Administrative: Instead of changing a process, administrative controls adapt procedures, offer training, and post warnings to mitigate risk. Posted warning signs, scheduling high-risk work when fewer crews are on site, worker rotation, and safe work procedures all fall into this category..
• Personal protective equipment (PPE): OSHA considers equipment like harnesses, eye and hearing protection, and cut-resistant gloves the least effective safeguard, as they’re a reaction to a hazard, not the removal or avoidance of it. Relying on PPE should be a last resort or an additional safeguard rather than a first response.

For each hazard, contractors should aim for elimination first, then go down the list in order of priority. 

PPE requirements by task and trade

Each step in the task should include relevant PPE and any other safeguards workers should be aware of. Along with the JHA, there should be communication about how relevant parties can access the PPE they need.

Sign-off and accountability

Note down the supervisor or competent person who wrote the JHA, any reviewers or contributors, and a date and timestamp. This tells readers where to direct questions and when the form might be out of date. It also helps ops leaders confirm when and where the assessment happened.

6 JHA steps to conduct a thorough assessment

Most JHA forms are straightforward to complete. OSHA offers a template, but large organizations typically tailor their own forms to their typical jobsites and tasks. 

Here are six steps contractors can follow to ensure they carry out a thorough jobsite safety assessment.

1. Break tasks into field-level work steps

Divide the task into on-site steps, including setup, execution, and cleanup. If prep work isn’t relevant to the people actually performing the task, separate it into its own JHA entry.

2. Identify hazards 

For each step, list potential hazards based on observations and previous incidents. Be thorough, and include both lesser-known and “common sense” risks. Don’t assume people will know what to look out for. 

To avoid missing anything, try asking these questions:

• Do tools and machines present any hazards?
• Could workers come to harm through contact with those tools and machines? 
• Will there be excessive noise or vibration?
• Does the task create silica dust, welding fumes, or other airborne hazards, or involve handling hazardous materials like solvents or lead paint?

Remember that hazards can change because of site conditions. For example, rain might cause more slips and falls, or moving equipment may be a struck-by risk to nearby crews. 

3. Evaluate risk exposure for each step

For each on-site step, rate potential hazards on a one-to-five scale according to likelihood and potential severity. Multiplying these two scores together will provide a risk score, helping teams assess risk at a glance.

4. Outline safeguards

Go through OSHA’s Hierarchy of Controls for each hazard and decide how to approach safeguards. Elimination should always be the primary goal, but it’s not always possible. 

With many hazards, it might be appropriate to deploy multiple safeguards. For example, a contractor might use exhaust ventilation as well as provide workers with face masks.

5. Communicate and implement 

Order tasks by how hazardous and how likely they are so workers can see the most important information first. Make sure everyone acknowledges that they’ve read it by collecting signatures. This should all happen before work begins so everyone can prepare for any potential hazards.

6. Review after job conditions change

Job conditions are rarely static. Weather changes with the seasons, and rotating crews affect who’s on-site at any given time. JHAs should be living documents that contractors update on the spot if circumstances change.

Bring JHAs into the workflow your crews already use.

A JHA only protects crews if it reaches them before work starts. Paper forms get filed and forgotten, and even when JHAs live in a safety app, they often sit apart from scheduling and daily reporting, so the hazards on the form never make it to the crew in the field.

Miter closes that gap by making JHAs part of one connected safety program. Safety data, time tracking, and daily reports live in the same system, so assessments stay tied to the jobs, crews, and shifts they cover.

With Miter, you can build reusable drag-and-drop JHA templates with AI assistance, walk crews through assessments in a toolbox-talk format, and attach completed forms directly to your daily reports.