People use stairs almost automatically. After the first few steps, the body begins expecting each riser and tread to feel like the one before it. When a step is unexpectedly higher, shallower, slippery, poorly lit, or missing proper handrail support, that normal rhythm can be disrupted.

Stair-related injuries are also far from rare. A national emergency department study estimated more than one million stair-related injuries per year in the United States. This guide looks at why stair dimensions and consistency matter, common safety standards and hazards, the injuries falls can cause, and when unsafe stairs may support a personal injury claim. If dangerous stairs caused you or a loved one serious harm, Shebell & Shebell’s personal injury attorneys in New Jersey can help review what happened. 

Why Proper Stair Design Matters

A well-designed staircase should feel predictable. People generally do not stop and calculate the height and depth of every step as they walk. Instead, the body establishes a pattern and repeats roughly the same movement from one step to the next.

That is why several basic features matter:

• Consistent riser heights
• Consistent tread depths
• Predictable stair geometry
• Secure handrails
• Adequate lighting
• Proper traction

When those features are inconsistent, a person may lift a foot too high, not high enough, or place it farther forward than the next step allows.

One stair-accident resource describes this in simple terms: after using one step, the brain expects the next step to require a similar leg movement. If the next riser or tread is different, even a relatively small variation can contribute to a loss of balance (Anthem, 2026).

Why Even Small Differences Can Matter

A dangerous staircase does not always look obviously broken.

One riser that is slightly higher than the others, a tread that is unexpectedly shallow, or a flooring change that alters the first or last step can interfere with where a person expects the next surface to be.

Consistency becomes especially important when walking downstairs because the user is placing a foot onto a lower surface while relying heavily on visual judgment and the rhythm established by previous steps.

A traditional stair-design formula also illustrates the relationship between riser height and tread depth:

2R + T = approximately 24 to 26 inches

The idea is not that every staircase must use one exact combination. Rather, riser height and tread depth work together to create a stride that feels natural and predictable.

How Common Are Stair-Related Injuries?

Stair accidents result in a substantial number of injuries.

A study published in the American Journal of Emergency Medicine analyzed U.S. emergency department data from 1990 through 2012. Researchers estimated that 24,760,843 people were treated for stair-related injuries during that period, averaging about 1,076,558 emergency department visits each year.

The study also estimated an injury rate of 37.8 stair-related injuries per 10,000 U.S. residents.

The most common injuries included:

• Sprains and strains: 32.3%
• Soft-tissue injuries: 23.8%
• Fractures: 19.3%

The areas of the body most frequently injured were:

• Lower extremities: 42.1%
• Head and neck: 21.6%

Younger children and older adults had especially high injury rates, although 67.2% of stair-related emergency department visits involved people between ages 11 and 60. 

What Are the Most Important Stair Safety Standards?

Stair standards exist in part to keep stairways predictable and usable. However, there is no single set of dimensions that applies to every staircase in every setting.

The applicable requirements can depend on the type of building, when it was constructed or renovated, how it is used, and which codes the local jurisdiction has adopted.

Riser Height and Tread Depth

Two of the most important measurements are the riser and tread.

• Riser: The vertical height from one step to the next.
• Tread: The horizontal surface where the foot lands.

The residential model-code material supplied for this guide references:

• A maximum riser height of about 7¾ inches
• A minimum tread depth of about 10 inches
• No more than 3/8 inch of variation among risers or among treads within a flight of stairs 

That last point is especially important. A staircase is not necessarily safe simply because each individual step is close to a normal size. The steps should also remain consistent with one another (Acadia Stairs, 2026). 

Handrails, Width, and Headroom

Other safety considerations can include:

• Secure and properly positioned handrails
• Adequate walking width
• Sufficient clearance above the stairs
• Properly sized landings
• Safe transitions at the top and bottom of the staircase

Handrails are particularly important because they can give someone a chance to recover after a misstep or loss of balance.

Headroom also matters. An unexpectedly low ceiling, beam, or other obstruction above the walking path can create an entirely different type of stair hazard.

Residential, Commercial, and Workplace Standards Can Differ

Residential stairs, commercial stairways, and workplace stairs may be subject to different rules.

Relevant factors may include:

• Whether the property is residential or commercial
• Occupancy and building use
• Construction date
• Local code adoption
• Later renovations
• Whether workplace safety regulations apply

For covered workplace stairways, OSHA requires features including uniform riser heights and tread depths between landings, appropriate handrail or stair-rail systems, and at least 6 feet 8 inches of vertical clearance above covered stair treads. 

OSHA also sets separate specifications for standard workplace stairs, including limits on stair angle, riser height, tread depth, and width. 

A staircase can therefore require a closer look at the specific building, its use, and the standards that applied when it was built or altered.

Common Stair Hazards That Cause Falls

Some stair accidents happen because a person simply loses balance. Others involve a specific condition that makes the staircase more difficult or dangerous to use.

Uneven Steps

Uneven risers or tread depths can interfere with the rhythm a person develops while using the staircase.

If one step is higher or lower than expected, the toe may catch the edge. If a tread is unexpectedly shorter, the foot may not land as securely as anticipated.

These problems can be difficult to notice visually, which is part of what makes them dangerous.

Shallow or Improperly Sized Treads

Tread depth affects how much room a person has to place a foot on the step.

A shallow tread provides less contact area and may make descending stairs particularly difficult. Inconsistent tread depths can create an additional problem because a user may place the foot based on the dimensions of previous steps.

Missing, Loose, or Improper Handrails

A handrail can help prevent a misstep from becoming a full fall.

Problems may include:

• No handrail where one should be present
• Loose or unstable rails
• Improperly positioned rails
• Rails that are difficult to grasp
• Broken or deteriorated components

A person who reaches for an unstable or poorly positioned handrail may also lose balance because the support they expected is not there.

Slippery Surfaces

Stairs can become dangerous when the walking surface does not provide adequate traction.

Potential hazards include:

• Water
• Ice
• Snow
• Highly polished flooring
• Worn surfaces
• Loose carpeting
• Worn stair coverings

Outdoor stairs may present additional problems when rain, snow, or ice is allowed to collect.

Poor Lighting

People need to be able to distinguish one step from the next.

Poor lighting can make it harder to see:

• Step edges
• Changes in elevation
• Landings
• Objects on the stairs
• Damaged surfaces
• Differences between riser heights or tread depths

Dark stair surfaces or poor visual contrast can make the edges of individual steps particularly difficult to identify.

Damaged Stairs

Stairs can become hazardous through wear, damage, or neglected maintenance.

Examples include:

• Cracked steps
• Broken nosings
• Loose boards
• Worn carpeting
• Broken tiles
• Structural deterioration
• Unstable stair components

A staircase that was originally built correctly can still become unsafe when damage is not repaired.

Clutter or Obstructions

Objects left on stairs create direct tripping hazards.

Common examples include:

• Boxes
• Merchandise
• Tools
• Cords
• Toys
• Shoes
• Trash or debris

This can become especially dangerous when the obstruction is difficult to see or leaves little room for someone to safely place a foot.

Poor Construction or Renovation

Some stair hazards originate when the staircase is built or altered.

Potential problems include:

• Uneven riser heights
• Inconsistent tread depths
• Incorrect stair geometry
• Poorly installed railings
• Improper landings
• Flooring changes that alter the first or last riser
• Repairs that create a new irregularity

For example, adding flooring at the top or bottom of an existing staircase can change the effective height of the first or last step if that additional thickness is not accounted for. The construction material supplied for this guide specifically identifies finished flooring as a common source of stair-layout mistakes (CED Technologies, 2025).

What Injuries Can a Stair Fall Cause?

Falling on stairs can cause more serious injuries than a fall on a flat surface because a person may strike several steps, railings, or a landing before coming to a stop.

Common injuries include:

• Sprains and strains
• Fractures
• Knee and ankle injuries
• Hip injuries
• Back injuries
• Neck injuries
• Head injuries
• Traumatic brain injuries
• Spinal injuries

A national study of stair-related emergency department visits found that 19.3% of injuries were fractures, while 21.6% involved the head or neck.

When Can a Stair Fall Lead to a Personal Injury Claim?

Falling on someone else’s stairs does not automatically mean the property owner was negligent.

A personal injury claim generally requires evidence that a dangerous condition existed and contributed to the accident. Learn more about how these cases are handled on our New Jersey slip and fall accidents page. If your fall involved unsafe stairs, a slippery surface, or another dangerous property condition, our New Jersey slip and fall attorneys can help you understand whether negligence may have played a role.

Was There a Dangerous Condition?

Potential hazards may include:

• Uneven risers or treads
• Broken steps
• Missing or loose handrails
• Poor lighting
• Slippery surfaces
• Debris or clutter
• Improper construction
• Building-code-related defects

The important issue is whether the staircase presented an unreasonable safety hazard rather than simply whether a fall occurred.

Did the Responsible Party Know or Should They Have Known?

Liability may also depend on what the property owner, manager, or other responsible party knew about the condition.

Questions may include whether they:

• Created the hazard
• Actually knew it existed
• Received prior complaints
• Should have found it through reasonable inspections or maintenance

A dangerous condition that develops and remains unaddressed may create a different situation from a hazard that appeared moments before the accident.

Did the Hazard Actually Cause the Fall?

Even if a staircase has a defect, the defect must still be connected to the accident.

For example, an uneven riser may be important if the person’s foot caught on that exact step. A broken handrail may matter if the person attempted to grab it while losing balance.

The condition, the fall, and the resulting injuries all need to fit together.

Do Building Code Violations Matter?

Building codes can be important when determining whether stairs were properly constructed or maintained.

Depending on the staircase, codes may regulate:

• Riser height
• Tread depth
• Dimensional uniformity
• Handrails
• Stair width
• Landings
• Headroom

A violation may provide evidence that the stairs were unsafe, but it does not automatically establish liability. The applicable requirements can depend on the type of property, jurisdiction, age of the staircase, later renovations, and the circumstances surrounding the fall.

Even relatively small dimensional differences may matter when they affect how someone uses the staircase. 

Evidence That Can Matter After a Stair Fall

Stair conditions can change quickly after an accident. A broken step may be repaired, a spill may be cleaned, or a loose handrail may be replaced. Preserving evidence early can therefore be important.

Useful evidence may include:

• Photos of the entire staircase
• Photos of the specific step involved
• Riser and tread measurements
• Handrail measurements
• Surveillance video
• Incident reports
• Witness information
• Maintenance records
• Inspection records
• Prior complaints
• Building permits
• Applicable building codes
• Engineering inspections
• Shoes and clothing worn during the fall

What Should You Do After the Accident?

If you are able:

1. Seek medical attention. Get injuries evaluated and documented.
2. Report the accident. Notify the property owner, manager, employer, or other responsible party.
3. Photograph the stairs. Capture the exact step, handrails, lighting, flooring, debris, and surrounding area.
4. Get witness information. Record names and contact information for anyone who saw the fall or condition.
5. Preserve evidence. Keep your shoes, clothing, photographs, medical documents, and accident paperwork.
6. Document the condition quickly. Do not assume the staircase will look the same days or weeks later.

These same evidence-preservation steps are emphasized in premises-liability guidance concerning stair accidents.

Frequently Asked Questions About Stair Accidents

Why Are Uneven Stairs Dangerous?

Uneven steps can disrupt the natural rhythm people develop while climbing or descending stairs, causing a foot to land higher, lower, or farther forward than expected.

What Are the Most Common Stair Hazards?

Common hazards include uneven steps, slippery surfaces, poor lighting, damaged treads, missing or loose handrails, clutter, and improper construction.

Can a Missing Handrail Make a Property Owner Liable?

Potentially. A missing or defective handrail may become important when one was required or when the lack of proper support contributed to the fall.

Can I Have a Claim if the Stairs Violated Building Codes?

Potentially. A code violation may be important evidence that the staircase was unsafe, but the violation must still be evaluated alongside causation, notice, and the other facts of the accident.

Who is Responsible for Maintaining Apartment or Commercial Stairs?

Depending on the property, responsibility may fall on an owner, landlord, property management company, commercial tenant, contractor, or another party responsible for maintaining the staircase.

What Evidence Should I Collect After Falling on Stairs?

Photographs, videos, witness information, incident reports, medical records, stair measurements, surveillance footage, and maintenance or inspection records can all be useful.

Speak With Shebell & Shebell After a Stair Fall

Safe stairs depend on predictable dimensions, proper traction, secure handrails, adequate visibility, and regular maintenance. When one of those elements is missing, what looks like a minor defect can become a serious fall hazard.

If poor construction, uneven stairs, broken surfaces, missing handrails, or another dangerous condition caused serious injuries, Shebell & Shebell’s personal injury attorneys in New Jersey can review what happened and help you understand your legal options.