Minor works

Minor works related to windows

Involving Construction or Alteration of Windows or Window Walls

Minor Works related to Windows 1
Minor Works related to Windows 2
Minor Works related to Windows 3
Involving Construction or Alteration of Windows or Window Walls
Minor Works Item Description
Class II
 Highest point from ground: > 3.5m - 100m
  • the span of structural element of window or window wall ≤ 6m
  • the works involve main frame or sub-frame of window or window wall (length of sub-frame > 1.2m)
Highest point from ground: > 100m
  • the span of structural element of window or window wall ≤ 6m
  • the area of the external wall opening for window or window wall ≤ 6m2; and
  • the length of shorter side of the opening ≤ 1.8m
Class III
 Highest point from ground: ≤ 3.5 m
  • the span of structural element of window or window wall ≤ 6m
Highest point from ground: > 3.5 m - 100 m
  • the works involve sub-frame of window or window wall only (length of sub-frame ≤ 1.2 m)

Involving Repair or Replacement of Windows or Window Walls

Involving Repair or Replacement of Windows or Window Walls
Minor Works Item Description
Class I
  • the works carried out in accordance with the original design
  • not MW item 2.8 or 3.6
Class II
 Highest point from ground: > 3.5m - 100m
  • the span of structural element of window or window wall ≤ 6m
  • the works involve main frame or sub-frame of window or window wall (length of sub-frame > 1.2m)
Highest point from ground: > 100m
  • the span of structural element of window or window wall ≤ 6m
  • if not in accordance with the original design
    • area of the external wall opening for the window ≤ 6m2; and
    • length or width (whichever is shorter) of the opening ≤ 1.8m; or
  • in accordance with the original design
Class III
 Highest point from ground: ≤ 3.5 m
  • the span of structural element of window or window wall ≤ 6m
Highest point from ground: > 3.5 m - 100 m
  • the works involve the sub-frame of window or window wall (length of sub-frame ≤ 1.2m)

Involving Removal of Windows or Window Walls

Involving Removal of Windows or Window Walls
Minor Works Item Description
Class II
  • height of window or window wall ≤ 6 m
  • not MW item 3.7
Class III
  • highest point from ground ≤ 3.5 m

Some considerations for construction or alteration of windows or window walls

  • Do not construct or alter windows or window walls to enclose green balconies and utility platforms which were granted with exemption from gross floor area calculation.
  • Construction or alteration of windows or window walls shall comply with the statutory requirements of natural lighting, ventilation and fire resisting construction.
  • Other considerations are given in section 3.1 of the "Technical Guidelines on MWCS".
  • Please note that every opening formed on an external wall above the ground floor of any building shall be protected by a barrier which shall be not less than 1.1m high (hereafter referred to as "protective barrier").

If the window or window wall works involve the removal or alteration of the original approved window/window wall/protective railing/parapet walls of balconies and verandahs or that part of the external wall with function as protective barrier, the minor works items 1.6, 1.15, 2.13, 2.14 and 3.11 may be involved.

If the window or window wall works involve repair or replacement of protective barrier (other than an external reinforced concrete wall or block wall) in accordance with the original design (i.e. the design as shown on plans approved under the Buildings Ordinance), Class II minor works item 2.5 may be involved.

Involving Alteration, Removal, Repair or Replacement of Protective Barrier or External Wall of Buildings

Involving Alteration, Removal, Repair or Replacement of Protective Barrier or External Wall of Buildings
Minor Works Item Description
Class I
 Erection, alteration or removal of protective barrier (other than an external reinforced concrete wall or block wall) and the works do not result in any additional load to cantilevered slab
Class I
 Erection, alteration, repair or removal of external non-load bearing reinforced concrete wall of a building satisfying the following criteria:
  • no additional load to cantilevered slab;
  • not involving alteration of other structural elements; and
  • height of the wall > 1.1m - 3.5m
Class II
 Repair or replacement of protective barrier (other than an external reinforced concrete wall or block wall) of a building satisfying the following criteria:
  • in accordance with the original design;
  • no additional load to cantilevered slab; and
  • the difference in height between the level on which the protective barrier is located and its adjacent level > 2m
Class II
 Erection, alteration or removal of external non-load bearing reinforced concrete wall of a building satisfying the following criteria:
  • no additional load to cantilevered slab;
  • not involving alteration of other structural elements; and
  • height of the wall ≤ 1.1m
Class II
 Erection, alteration or removal of external non-load bearing block wall of a building satisfying the following criteria:
  • no additional load to cantilevered slab;
  • not involving alteration of other structural elements; and
  • height of the wall is > 1.1m – 3.5m
Class III
 Erection, alteration or removal of external non-load bearing block wall of a building satisfying the following criteria:
  • no additional load to cantilevered slab;
  • not involving alteration of other structural elements; and
  • height of the wall ≤ 1.1 m
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