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Performance-based egress is an engineering method for showing that occupants can reach safety even when a building’s atrium, open floor plan or other architectural feature does not fit a standard prescriptive arrangement. Instead of treating the design as an automatic waiver, the project team demonstrates—using documented fire and evacuation scenarios—that available safe egress time (ASET) exceeds required safe egress time (RSET). The approach can preserve design intent, but it still must satisfy the locally adopted code and win approval from the authority having jurisdiction (AHJ).
What problem does performance-based egress solve?
Prescriptive life-safety codes are written around repeatable dimensions and arrangements: exit numbers, travel paths, door widths, stairs, fire-resistance ratings, alarms and other safeguards. Those rules make plan review predictable, but a large atrium, interconnected floor plates, a dramatic stair, a museum-like volume or an unusually open workplace may not fit the assumptions behind a standard layout.
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1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsA performance-based solution starts with the same life-safety objective—getting people out or to a protected place before conditions become untenable—but demonstrates compliance through project-specific engineering. The team defines credible fire scenarios, models fire development and occupant movement, documents assumptions and presents the evidence to the AHJ. The result is flexibility in the way the safety outcome is achieved, not permission to ignore safety requirements.
Building Design + Construction’s discussion of the approach describes it as a way to maintain a desired building or space design while keeping occupants safe. The article also stresses that the local AHJ decides whether the proposal is acceptable. Codes such as the NFPA 101 Life Safety Code and the International Building Code can provide the governing framework, but the edition and amendments adopted at the project location control.
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What is the difference between prescriptive and performance-based egress?
Prescriptive compliance follows the adopted code’s stated dimensions and arrangements. Performance-based compliance demonstrates that the required safety outcome is met by analyzing the actual building, occupants, fire protection systems and hazards.
| Decision axis | Prescriptive route | Performance-based route |
|---|---|---|
| Method | Use the code’s specified dimensions, quantities and arrangements. | Use project-specific analysis to demonstrate the required life-safety outcome. |
| Design flexibility | Predictable constraints can require changes to the desired layout. | Unusual layouts may remain feasible when the analysis supports them. |
| Evidence | Plans and calculations are checked against prescriptive criteria. | Occupant, alarm, movement, fire and building assumptions must be documented and modeled. |
| Review path | Conventional code review under local procedures. | Early and continuing AHJ engagement, often with more detailed technical discussion. |
| Fixed provisions | Adopted prescriptive requirements apply. | Some requirements may remain prescriptive even when other provisions are analyzed. |
Neither route is inherently safer, faster or cheaper. A performance-based design can avoid an architectural compromise, but it can also require more engineering, coordination and review time. The appropriate choice depends on the building, the applicable code and the AHJ’s willingness to accept the proposed method.
How do ASET and RSET determine whether an egress concept works?
The central test is simple: available safe egress time (ASET) must be greater than required safe egress time (RSET). In practice, the project must show that people can be alerted, decide to move and reach a safe location before smoke, heat or toxic conditions make the relevant area untenable. NFPA committee material states the relationship directly: “the available safe egress time (ASET) must always be greater than the required safe egress time (RSET).”
The comparison is not a single stopwatch value. It is a chain of assumptions, calculations and safety judgments. A defensible analysis explains what happens if detection is slower, occupants hesitate, a route becomes congested or a fire develops in a different location.
What makes up RSET?
- Alarm time. This is the period from ignition or another initiating event until occupants receive an intelligible warning. Detection, alarm, notification and system sequence assumptions affect this value.
- Pre-movement time. People may need to recognize the alarm, understand its meaning, collect information, assist others and decide which route to use. Occupancy type, familiarity with the building, staffing and occupant capabilities influence the assumption.
- Movement time. This is the time required to travel through rooms, doors, corridors, stairs and other portions of the egress system. Walking speeds, route widths, merging flows, bottlenecks and the needs of people with disabilities all matter.
Adding these components produces the required safe egress time for the modeled scenario. A credible report explains why each input is appropriate instead of presenting a single unexplained evacuation number.
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How is ASET estimated?
Available safe egress time comes from fire and smoke analysis. The model examines how conditions develop under defined design fires and when temperature, smoke, visibility or other tenability criteria are no longer acceptable for the occupants being considered.
Inputs can include the building’s geometry and construction, contents and potential fuel, fire location, detection and suppression assumptions, compartmentation and smoke-control features. Occupancy and occupant characteristics also affect the interpretation of the results. The analysis should identify which assumptions are conservative, which are supported by the design and which require sensitivity checks.
Building Design + Construction attributes eight design fire scenarios to Chapter 5 of NFPA 101 for the approach it discusses. That number should not be treated as a universal instruction for every code edition or jurisdiction. Confirm the applicable edition, amendments and AHJ interpretation before selecting scenarios for a real project.
What does the modeling process look like?
Evacuation and fire models answer different questions and should not be conflated. An egress model estimates how occupants move through the building; a fire model estimates developing conditions and tenability. A tool such as Pathfinder 2024.2 documents occupant movement and pathfinding capabilities, but an egress simulation by itself does not prove the fire-condition analysis needed to establish ASET.
- Define the design objective. Identify the architectural feature to preserve, the occupied areas affected and the safety outcome the code requires. Clarify whether the analysis concerns complete evacuation, movement to a protected refuge or another code-recognized endpoint.
- Confirm the regulatory basis. List the locally adopted building and life-safety codes, referenced standards, amendments and AHJ procedures. Record the edition rather than assuming that the newest publication applies.
- Build an accurate building model. Include floor geometry, vertical connections, doors, stairs, barriers, exits, fire-resistance features and relevant mechanical or suppression systems. Errors in the geometry can make a precise calculation misleading.
- Describe occupants and behavior. Establish population, distribution, mobility needs, familiarity, staff roles and likely pre-movement delays. Explain assumptions for walking speeds, route choice and assistance.
- Select fire scenarios. Vary the fire location and fuel conditions that could challenge the design. Include scenarios relevant to the atrium, open floor, concealed spaces or connections that make the project unusual.
- Calculate RSET. Combine alarm, pre-movement and movement components for each scenario. Check for queuing and bottlenecks at doors, stairs, corridors and points where flows merge.
- Calculate ASET. Use fire and smoke analysis to identify when the specified tenability limits are reached in occupied areas and along egress routes.
- Compare results and test sensitivity. Demonstrate ASET greater than RSET with a defensible margin. Explore how the conclusion changes if detection, pre-movement, walking speed, fire growth or a protection-system assumption varies.
- Document safeguards and residual requirements. State which features are essential to the result, how they will be designed and maintained, and which provisions remain prescriptive.
- Review with the AHJ. Present the method, inputs, results, limitations and proposed acceptance criteria early enough to change the design if the reviewer requires another scenario or safeguard.
What can performance-based egress change—and what may remain fixed?
The method can support an unconventional arrangement when the analysis demonstrates an equivalent or acceptable safety outcome. It does not automatically remove every dimensional or equipment requirement. The source article gives emergency lighting, minimum door widths and stair-tread heights as examples of provisions that may remain prescriptive under the described approach; the exact list depends on the adopted code and the AHJ.
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For example, a model might support an open visual connection between floors, but the project may still need compliant door hardware, illumination, stair geometry, alarm notification or fire-resistance construction. A design that depends on smoke control, detection or suppression must also show how those systems are specified, commissioned and kept available. Treat every “trade” as a documented design decision rather than an informal exception.
How should the design team work with the AHJ?
Early alignment is one of the most important practical controls. A performance-based report delivered after the architectural and mechanical systems are fixed can reveal a problem that is expensive to correct. The source article recommends bringing a qualified fire protection engineer onto the project as early as possible because the work can require deeper analysis and more discussion than a conventional code path.
Before detailed modeling, request an AHJ meeting or pre-application review where available. Bring a concise concept package showing the architectural intent, occupancy, proposed compliance method, applicable code edition and the safeguards on which the concept depends. Ask what scenarios, tenability criteria, acceptance margins and documentation the reviewer expects.
Keep a decision log. Record questions, agreed assumptions, requested revisions and the person or agency responsible for each action. If the AHJ changes an assumption—such as the occupant load, fire location or required endpoint—update both the fire and egress analyses rather than editing only the final narrative.
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- Wrong code edition. NFPA’s code-development page listed the 2027 edition of NFPA 101 as current when checked on November 12, 2026, but a jurisdiction may have adopted an earlier edition with local amendments. Verify adoption before relying on any edition-specific provision. The NFPA 101, Life Safety Code, 2027 edition product page identifies the publication, not the law in a particular location.
- Incomplete scenarios. A favorable result for one fire location does not establish safety for every credible location. Explain why the selected scenarios represent the building’s hazards and geometry.
- Unrealistic occupant behavior. Very short pre-movement times, unrestricted route choice or uniform walking speeds can understate RSET. Use occupancy-specific assumptions and include people who may need assistance.
- Confusing movement with tenability. A pathfinding result does not show that smoke, heat and visibility remain acceptable. Fire-condition analysis is needed to establish ASET.
- Overlooking dependencies. If the conclusion relies on detection, sprinklers, smoke control, emergency power, door operation or compartmentation, identify those dependencies and their inspection or maintenance requirements.
- No acceptance agreement. A technically polished report can still fail if it uses criteria the AHJ did not accept. Confirm the review basis before investing in final documentation.
- Late redesign. Discovering a deficient ASET/RSET relationship after construction documents are complete can force changes to geometry, systems or occupancy. Start the engineering work while the layout is still flexible.
What should a performance-based egress report contain?
A useful submission lets an independent reviewer reproduce the logic. Include the project description, code and edition, occupancy and occupant-load assumptions, architectural and systems drawings, design fire scenarios, fire-model inputs, egress-model inputs, tenability criteria, RSET breakdown, ASET results, sensitivity studies, limitations and conclusions for every scenario.
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Add a clear table of required safeguards and responsibility. Identify which features are architectural, structural, mechanical, electrical, fire-protection or operational; who designs each one; and how it will be verified before occupancy. Attach model versions and input files where the AHJ permits, and explain any simplifications that could affect the result.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When is a prescriptive solution still the better choice?
Use the prescriptive route when the layout fits the adopted code without harming the project’s goals, when the AHJ does not accept an alternative method, or when the cost and schedule of detailed analysis outweigh the design benefit. A straightforward code solution is often easier to permit, document and maintain.
Performance-based analysis is most valuable when a specific architectural or operational objective cannot reasonably be achieved with standard arrangements and the owner is prepared to support the engineering, review and long-term safeguards. It should be selected for a clear design reason, not as a shortcut around basic egress obligations.
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- Identify the feature worth preserving and the prescriptive provision that creates the conflict.
- Confirm the project location, adopted codes, amendments and AHJ contact.
- Engage a qualified fire protection engineer during concept or schematic design.
- Agree on the performance objectives, scenarios, tenability criteria and documentation format before modeling.
- Reserve time for an AHJ review and at least one design iteration.
- Carry the accepted assumptions into construction documents, commissioning and operations procedures.
This sequence keeps the analysis connected to real design decisions. It also makes clear whether the project is pursuing a performance-based alternative, a prescriptive design, or a combination in which only selected provisions are demonstrated analytically.
What is the practical conclusion?
Performance-based egress can protect an ambitious building concept by replacing an inflexible code arrangement with a documented demonstration of safety. The essential proof is project-specific: under credible fire scenarios, occupants must have enough time to receive the alarm, respond and move to safety before conditions become untenable, with ASET greater than RSET.
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That proof is only one part of approval. The locally adopted code, AHJ interpretation, prescriptive provisions that remain applicable, quality of the assumptions and reliability of the required fire-protection systems all determine whether the concept can be built. Involve the fire protection engineer early, agree on the analytical basis with the AHJ and treat the resulting safeguards as design commitments rather than optional features.
Frequently Asked Questions
Can a performance-based design eliminate the need for emergency exits?
Usually, no. The analysis may support a different arrangement or demonstrate that a particular prescriptive configuration is unnecessary, but the adopted code and AHJ determine what exits and protected egress elements are required. Emergency lighting, door widths and stair geometry may still be fixed provisions in the applicable jurisdiction.
Does NFPA 101’s 2027 edition apply to every new building?
No. NFPA listed the 2027 edition as current in November 2026, but enforcement depends on the edition adopted by the project’s jurisdiction and any local amendments. Confirm the governing code with the AHJ before choosing criteria or citing a chapter.
How much safety margin should ASET have over RSET?
The available data does not establish one universal margin. The acceptable relationship depends on the adopted code, the AHJ’s criteria, scenario selection and the uncertainty in fire and occupant assumptions; the report should explain why its margin is defensible.
Can an architect prepare the entire performance-based egress analysis alone?
Complex cases normally require coordinated input from a qualified fire protection engineer, architect, mechanical and electrical designers and the code official. Fire-condition modeling, occupant behavior assumptions and system dependencies must align, and the AHJ may require a responsible professional’s sealed analysis.
Is evacuation software enough to prove that an atrium is safe?
No. Egress software can estimate occupant movement and pathfinding, while a separate fire analysis establishes smoke, heat and other tenability conditions. Both sides of the ASET/RSET comparison, along with the building’s protection systems and assumptions, must be addressed.
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