Railing height must be checked for the actual edge, occupancy and applicable code provisions. This guide explains how to distinguish a protective guard from a graspable handrail and record dimensions on drawings before fabrication.
A balcony guard, a stair handrail and a corridor support rail perform different functions. Identify the fall risk, route type, occupancy and finished levels before selecting the railing arrangement. A handrail provides a grip; a guard protects an open edge. Some stair details include both, with different measurement points.
The applicable requirements may come from NBC provisions, adopted local regulations and the project specification. Record the edition, clause and any project requirement used for each detail. A value taken from another project should not be treated as a universal minimum.
There is no single railing height in millimetres that covers balcony guards, stair handrails and accessible-route handrails. Identify the function and applicable provision first, then dimension the approved detail from the correct finished level or stair datum.
| Element | Drawing check |
|---|---|
| Balcony or landing guard | Show finished floor level and top of guard. Account for the final floor build-up. |
| Stair handrail | Show the specified measurement relative to the tread nosing line and the landing transitions. |
| Ramp or accessible-route handrail | Check accessibility provisions, rail arrangement, continuity and returns separately. |
For unit conversion, 1 m = 1,000 mm. This conversion is not a prescribed guard height. Record the approved requirement in mm beside its datum and code reference.
For a balcony or landing guard, show the relevant finished floor level and top of guard on the section. Coordinate screed, stone, tile and waterproofing build-ups. Measuring from the unfinished slab can leave the completed guard lower than intended.
For a stair handrail, show the specified measurement relative to the tread nosing line. Draw the transitions at landings and changes of direction. A dimension normal to the stair slope is different from a vertical dimension; the drawing must make the intended measurement clear.
Use one dimension convention across elevations, sections and the railing schedule. State guard height and handrail height separately where both are present. Include the datum beside the dimension rather than relying on a general note.
Before production, resolve differences between the architectural section, structural detail and BOQ. Do not order panels from a height quoted on an information page without checking the approved drawing. For glass systems, also coordinate any cap rail or top fitting that affects the completed height.
The infill layout needs its own review. Check openings between members, beneath the guard and at stair interfaces against the applicable safety requirements. A height check alone does not establish that the guard is suitable.
Consider how occupants use the space. Horizontal members, adjacent ledges and changes in floor level can affect the safety assessment. Confirm any special requirements for children, public circulation or maintenance routes with the design team.
Height compliance does not establish load capacity. The glass, posts, rails, brackets and anchors must resist the design actions for the application. IS 875 Part 2 concerns imposed loads, Part 3 concerns wind loads, and Part 5 concerns special loads and load combinations.
For exposed guards, coordinate the wind assessment with the project structural design. Occupancy, geometry, fixing conditions and load combinations must be considered together. Do not use a city name or a generic wind-zone label as a substitute for a design calculation.
Confirm the occupancy and route type; the applicable references; finished floor and nosing datums; guard and handrail heights; infill openings; glass or member sizes; anchor layout; fixing substrate; waterproofing interfaces; and inspection requirements.
Mark the approved revision on the fabrication schedule. Check that quantities and panel dimensions refer to that revision. Where site dimensions differ from the drawings, obtain the revised detail before cutting glass or drilling fixing holes.
Send plans, elevations, sections, the railing schedule and the project location. Identify the material, finish, quantities, design information and whether supply, installation or both are required. Calculation, testing and handover documents should be agreed in the order scope.
Review balcony railings, staircase railings and handrails for the relevant system. Share drawings for a quotation.
Use the applicable code edition, amendments and approved project specification. BIS: National Building Code describes the relevant code parts. BIS: Know Your Standard provides the route to verify individual Indian Standards.