The technical specifications of the supporting structure or metal casing for a building services installation for validation and corresponding minor works items are listed in Part 4 of Schedule 3 of the Building (Minor Works) Regulation (B(MW)R). The works must be in existence or completed before 1 September 2020.
The prescribed building or building works item
1
Corresponding minor works item
1.50
- The supporting structure or casing is located on-grade, on a canopy (other than a cantilevered slab) or on a roof (other than a cantilevered slab) of a building
- Not involving alteration to any other structural elements
- For a supporting structure:
- Height of the supporting structure
- for an antenna or transceiver
≤ 2.5m - for any other BSI
≤ 1.5m
- for an antenna or transceiver
- Height of the supporting structure
- For a casing:
- Weight
≤ 10% of the weight of the BSI - The inner surface of the casing and the BSI
≤ 200mm apart in all directions
- Weight
The prescribed building or building works item
2
Corresponding minor works item
3.50
- The supporting structure or casing is located on-grade or on a roof (other than a cantilevered slab and an inaccessible roof) of a building
- Not involving alteration to any other structural elements
- For a supporting structure:
- Weight BSI
- ≤ 200kg; and
- Average weight of BSI ≤ 100kg/m2 of the ground area (if located on–grade) or slab area (if located on a roof)
- Height of the supporting structure
- for an antenna or transceiver
≤ 2.5m - for any other BSI
≤ 1.5m
- for an antenna or transceiver
- Weight BSI
- For a casing:
- Weight
≤ 10% of the weight of the BSI - The inner surface of the casing and the BSI
≤ 200mm apart in all directions
- Weight
Notes:
- Building services installation (BSI) includes (i) any solar water heating system, photovoltaic system, antenna, transceiver, air-conditioning unit, water cooling tower, light fitting and pump set (installations); and (ii) any duct associated with any of the installations; and excludes any water tank, lift, stairlift, lifting platform, ventilation duct and radio base station.