Common Egress Design Mistakes in Construction Drawings

Egress as a Code Compliance Bottleneck

Egress design—the path people take to exit a building in an emergency—is one of the most heavily regulated aspects of construction. The International Building Code (IBC) specifies minimum corridor widths, maximum travel distances, stair dimensions, exit discharge requirements, and dozens of other parameters. These requirements exist to protect occupants; they can't be waived.

Yet egress errors are among the most common findings in construction plan reviews. A city or fire official reviews the drawings and flags egress deficiencies: a corridor that's too narrow, an exit stair that's too small, a travel distance that exceeds the code allowance. The project can't get a permit until the issue is fixed. The architectural team scrambles to redesign, adding time and cost before construction ever begins.

If egress errors aren't caught during design, they're often discovered during preconstruction review or even during occupancy inspection—after the building is substantially constructed. Fixing egress problems at that point means demolition, redesign, and delay.

Error Type 1: Corridor Width Violations

IBC Section 1005 specifies minimum corridor widths based on occupancy and occupant load. For most commercial occupancies, the minimum is 36 inches. For high-hazard or high-traffic areas, it may be 44 inches. These widths are measured clear of doors, obstructions, and obstacles.

Common corridor width errors:

• Doors reduce clear width: A 36-inch corridor is minimum. But when a door is opened into that corridor, it encroaches on the egress path. The clear width becomes less than 36 inches. The drawing doesn't account for this.
• Recessed doors not detailed: If a door opening recesses 6 inches into the wall (rather than opening into the corridor), it preserves the corridor width. But if the architectural drawing shows a standard door frame without specifying the recess, the contractor may install it flush, reducing egress width.
• Finishes encroaching on corridor: A 36-inch corridor dimension is measured face-to-face of wall finishes. If the drawing doesn't account for wall thickness, insulation, or finish materials, the clear corridor width ends up less than required.
• MEP in corridors: Structural columns, ductwork, or electrical conduit running through a corridor can reduce clear width. If the drawing doesn't show these systems or account for their width, the corridor becomes too narrow once everything is installed.
• Furniture and fixtures: Some corridors include built-in shelving, data cabinets, or other fixtures. The drawing shows the fixture location, but doesn't verify that the remaining clear corridor width meets code.

Error Type 2: Travel Distance Exceedances

IBC Section 1006 limits the maximum travel distance from any point in a room or space to an exit. The distance depends on occupancy type and whether sprinklers are installed. For example, in an office building without sprinklers, maximum travel distance is typically 200 feet. With sprinklers, it's 250 feet.

Travel distance is measured along the actual path a person would walk, not in a straight line. This includes turns around columns, through corridors, and to exit doors.

Travel distance errors include:

• Dead-end corridors too long: A corridor with exits only at one end creates a dead end. The code limits dead-end corridor length based on sprinklers. A 50-foot dead-end corridor is allowed in a sprinklered building, but only 20 feet in an unsprinklered one. Drawings often violate this without the designer realizing the corridor is a dead end.
• Open floor plans not analyzed: In an open office or retail space, the travel distance is measured along the natural path to exits. If the floor plan has only one visible exit but a secondary exit exists elsewhere, the travel distance to that secondary exit must be calculated. Designers sometimes ignore the secondary exit or assume occupants will know to use it.
• Alcoves and spaces not included: A dead-end alcove off a main corridor has its own maximum travel distance. If a printer room or storage closet is 40 feet down a dead-end alcove from the corridor, that alcove itself violates the travel distance limit. The drawing may show the alcove but not calculate travel distance to an exit from that space.
• Accessibility conflicts: Sometimes, the only accessible exit is 280 feet away, but code requires travel distance to an accessible exit to be equal to or greater than the travel distance to any exit. If non-accessible exits are closer, the design violates accessibility requirements.

Error Type 3: Exit Stair and Ramp Deficiencies

Exit stairs and ramps have specific code requirements: tread depth, riser height, handrail height and continuity, landing dimensions, slope, etc. Many drawings show stairs that are dimensioned incorrectly or lack required details.

• Stair width too narrow: The minimum stair width for an exit stair depends on occupancy. It might be 42 inches clear of handrails. A drawing might show 42 inches total width without accounting for the handrail depth, resulting in insufficient clear width.
• Landing dimensions inadequate: At the top and bottom of a stair, there must be a landing with minimum depth (typically 44 inches). Doors opening onto landings need to swing within the required landing area. Drawings often minimize landing size and create code violations.
• Handrail continuity broken: Handrails must be continuous on exit stairs, including extensions beyond the top and bottom of the stair. Drawings sometimes show railings that end partway down, or handrails that terminate without proper extension.
• Accessible stair details missing: Where an accessible route is required to an exit, any stairs in that path must have a compliant accessible ramp alternative. The drawing may show the stair but not the ramp, or show a ramp with insufficient slope or landing area.

Error Type 4: Exit Discharge and Separation

An exit must discharge occupants to the outside—to a public way or an area of safe refuge. The path from the exit door to the outside must be clear, direct, and unobstructed. Additionally, exits must be separated from each other and from the space they serve. Separation is typically provided by fire-rated walls.

• Exit discharge blocked: An exit stair opens into a corridor, but that corridor leads back through the occupied space (e.g., a retail store) before reaching the outside. This violates the requirement that exit discharge be direct. The drawing may not show this problem because the circulation path isn't traced all the way to the outside.
• Fire separation missing: Exit stairs and exit corridors must be separated from the occupied space by fire-rated construction. A drawing might show walls around an exit stair, but not specify the fire rating or show that all penetrations (doors, ductwork) are properly rated.
• Exit separation inadequate: If a building requires multiple exits, those exits must be separated by a minimum distance (typically 1/3 of the diagonal of the space). Two exits on the same wall, close together, don't meet the separation requirement. The drawing might show exits but not verify separation distance.
• Occupancy separation not detailed: In mixed-occupancy buildings, spaces with different occupancy types must be separated by fire-rated walls and doors. The drawings must clearly show which occupancy is which and what separation is required. This is often inadequately detailed.

Why Egress Errors Happen

Egress errors occur for several reasons:

• Designer assumes occupancy classification but doesn't verify code requirements: The architect designs for a general office without checking whether the specific occupancy and load require additional exits or different corridor widths.
• Sprinkler assumptions not documented: Travel distance and other requirements change if sprinklers are or aren't installed. If the drawing doesn't clearly state "assumes sprinklered" or "unsprinklered," confusion arises during construction.
• Building code not consulted during design: Some firms rely on rule-of-thumb spacing (e.g., "exits every 150 feet") without consulting the code for the specific project. Rule of thumb might not match code for that occupancy.
• Architectural and structural design disconnect: Architects design egress routes, but structural engineers place columns. If they don't coordinate, a column might end up in the middle of a required corridor or exit path.
• Building code changes missed: Code editions change every 3 years. A 2018 set of standards may not apply to a 2026 project if local codes have updated. Designers using old standards don't catch new requirements.

Catching Egress Errors in Preconstruction Review

Step 1: Verify Occupancy Classification

During drawing review, confirm the occupancy classification for each space. Review the specifications and construction documents to ensure the design team classified occupancies correctly. If the design assumes Office (B) but the actual use is more like Assembly (A), all egress requirements change.

Step 2: Calculate Travel Distance

Trace the path from the farthest point in each space or room to an exit, measuring along the actual egress path (not a straight line). Verify that the distance doesn't exceed code limits for the occupancy and whether sprinklers are installed. Note any dead-end corridors and verify they comply with length limits.

Step 3: Check Corridor Widths

For each egress corridor, measure the clear width (face-to-face of finishes) and account for any openings (doors, alcoves). Verify the width meets code minimums. Check that door openings don't reduce clear width below the required dimension.

Step 4: Verify Stair and Ramp Dimensions

Review stair details for tread depth, riser height, handrail dimensions, and landing sizes. For accessible routes, verify ramp slopes and landing dimensions. Confirm that stairs and ramps meet egress basics and ADA requirements where applicable.

Step 5: Check Exit Separation and Discharge

Verify that exits are separated by the required distance. Trace the path from each exit to the outside to confirm that discharge is direct and doesn't re-enter the occupied space. Check that fire separations around exits are clearly shown and rated.

Step 6: Flag Any Ambiguities with the Design Team

If the drawings don't clearly show egress routes, verify them with the architect before construction. Clarify assumptions (sprinklers yes/no, occupancy classification, future use). Get written confirmation of egress compliance from the design professional.

The Cost of Egress Mistakes

An egress error caught during design review costs a revision and delay before bidding. The same error caught during permit review costs schedule delay and possible redesign. Caught during construction or occupancy inspection, it costs demolition, redesign, and permit delays—potentially stopping occupancy.

Beyond cost, egress errors are life safety issues. Under-sized exits, inadequate travel distances, or missing fire separation put occupants at risk. These aren't cosmetic problems; they're code violations that jurisdictions take seriously.

Preconstruction egress review is one of the most critical safety and schedule controls available on any construction project. Articulate's code compliance features help identify egress deficiencies early, before they delay projects or compromise safety.