General construction: how buildings go together
Stairs and egress: rules of thumb
Stairs and exits are among the most tightly regulated parts of a building because they are used in emergencies. Here are the principles behind the rules and the points to check, with the local code as the final answer.
Stairs and exits are among the most tightly regulated parts of a building because they are used in emergencies. Here are the principles behind the rules and the points to check, with the local code as the final answer.
Why the rules are strict
People fall on stairs and must leave quickly in a fire. Codes control the dimensions, handrails, guards and exit routes to reduce falls and speed escape.
Stair geometry
Codes set maximum riser height, minimum tread depth, minimum width and headroom, and they require uniform steps, because inconsistent steps cause trips. The numbers differ by place and use, so take them from your code, not from a rule of thumb. See the railings and stairs catalog page for products.
Handrails and guards
Handrails give grip along the stair; guards stop falls from edges above a code-set height. Guards must also resist set loads and limit gaps small children can pass through.
Egress
Egress means a continuous route to safety: from any room to the exterior, through doors that open without keys, along routes that stay clear. Bedrooms usually need a second way out such as an egress window. The number and width of exits depend on use and occupancy.
Check list
- Uniform steps and clear headroom.
- Handrails graspable and continuous.
- Guards at drop edges.
- Exits unobstructed, doors that open from inside.
- Lighting and, where required, emergency lighting.
Quick answers
- What is the maximum riser height? It is set by local code and varies; check the adopted code for your location and use.
- What counts as egress? A continuous, unobstructed route from any occupied space to a safe place outside.
- Do bedrooms need a window exit? Often yes, with minimum opening sizes set by code.
Keep reading
- Railings and stairs
- Fire safety in buildings: the basics
- Accessible design coordination for modular projects
- Window and door installation principles
Always check the project drawings and specification, and confirm requirements with the engineer of record and the local authority.
Questions people ask
What is the maximum riser height?
It is set by local code and varies; check the adopted code for your location and use.
What counts as egress?
A continuous, unobstructed route from any occupied space to a safe place outside.
Do bedrooms need a window exit?
Often yes, with minimum opening sizes set by code.
Sources and further reading
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