What is the basic module for vertical coordination?

The basic module (1M) is 100 mm. This is the fundamental unit for all modular dimensions.

What are the recommended standard storey heights?

Preferred storey heights are 2700, 3000, 3300, and 3600 mm, which are multiples of the 300 mm (3M) multimodule (Table 1).

What is the recommended minimum clear head-room height?

The minimum preferred height for head-room (from finished floor level to finished ceiling level) is 21M or 2100 mm (Clause 6.3.1).

What is the standard modular height for a door opening?

The preferred co-ordinating size for the height of a doorset is 21M or 2100 mm (Table 4).

IS 7922

: 1987

Recommendations for modular coordination in the building industry: Vertical co-ordination

CurrentFrequently UsedGuidelinesBIMArchitectural · Planning, Housing and Pre-fabricated Construction

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This standard provides recommendations for vertical dimensional coordination in the building industry, forming a key part of the modular coordination system. It establishes a system based on a basic module of 100 mm (1M) to standardize storey heights, floor-to-ceiling heights, and dimensions of components like doors and windows. The goal is to facilitate the use of prefabricated components and streamline the architectural design and construction process.

Recommendations for modular coordination in the building industry: Vertical co-ordination

Quick Reference Values

Basic Module (1M)100 mm

Preferred Multimodule for Vertical Dimensions3M (300 mm)

Preferred Storey Height Range27M (2700mm) to 36M (3600mm) in 3M increments

Minimum Preferred Head-room Height21M (2100 mm)

Preferred Co-ordinating Height for Doorsets21M (2100 mm)

Practical Notes

This standard is the conceptual foundation for setting up vertical grids and levels in architectural drawings and BIM models.

Adherence to these modular principles is critical for projects involving prefabrication or system formwork to minimize on-site alterations and waste.

While the standard gives preferred dimensions, always cross-check with local building bye-laws which may specify different minimums (e.g., minimum ceiling height).