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Urban Redevelopment Authority (URA)

Cable Chambers

Find out the GFA treatment for cable chambers

Last updated 6 June 2026

Cable Chambers Integrated with the Main Building

Cable chambers integrated within the main building are excluded from GFA if it does not exceed 2.5m in height1.

Integrated substation section showing non-GFA cable chamber below switch room in main building.

Cable Chambers Integrated Within Main Building

1 The structural beams shall also be included in the height computation.

Standalone Cable Chambers

Standalone cable chambers that fulfil either criteria below are excluded from GFA:

  • The height2 of the cable chamber, measured from the floor to the underside of the upper floor shall not exceed 2.0m; or

  • The combined height2 (a + b) shall not exceed 4.5m for Residential developments, 5.0m for Commercial developments or 6.0m for Industrial or Warehouse developments.

Standalone substation section with cable chamber headroom ≤2m and within 1st storey height.

Example of Standalone Cable Chamber Excluded from GFA

Standalone substation section showing switch room over non-GFA cable chamber within height control.

Example of Standalone Cable Chamber Excluded from GFA

2 The structural beams shall also be included in the height computation.