Design Rules›📏 Heights & Clearances

Ceiling Height — Air-Conditioned Rooms

Reduced minimum for AC habitable rooms
See also📖 NBC 2016🔗 IS 10435🧮 RCC Design📒 Handbook
2.40
m
2.40 m ceiling height — AC habitable roomROOM2.40mAC HABITABLE ROOM — SECTION VIEW
Primary value2.40 m
Applies toAC bedrooms · AC living rooms · AC offices in residential buildings
Measured asFrom FFL to the lowest point of the ceiling. The relaxation applies only when the room is mechanically conditioned.
SourceNBC 2016 — Part 4, Clause 5.4.1
📚 Cross-referenced
Why this matters

NBC permits a lower ceiling for AC rooms because mechanical ventilation eliminates the airflow argument that drives the 2.75 m minimum for naturally-ventilated rooms. Lower ceilings reduce the cooled volume — meaningful energy savings over the room's life.

Typical practice

Used in compact urban apartments and small-format hotels where every cubic metre of conditioned air is a recurring cost. Avoid in living rooms — even with AC, low ceilings feel claustrophobic.

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