{
  "url": "https://openlegislation.uk/building-inner-london-regulations-1985/schedule-3/paragraph-3",
  "json_url": "https://openlegislation.uk/building-inner-london-regulations-1985/schedule-3/paragraph-3.json",
  "legislation": "uksi/1985/1936",
  "legislation_title": "The Building (Inner London) Regulations 1985",
  "legislation_url": "https://openlegislation.uk/building-inner-london-regulations-1985",
  "path": "schedule/3/paragraph/3",
  "kind": "paragraph",
  "number": "3",
  "heading": null,
  "text": "Section 21 of that Act (uniting of buildings) shall have effect as if—\n(a) in subsection (2) the words “and any byelaws made in pursuance of those Acts” were omitted;\n(b) for subsection (4) there were substituted the following subsections—\n“(4) Subject to the following provisions of this section where an opening is to be made in—\n(a) any division wall; or\n(b) any party wall; or\n(c) two external walls,\nseparating divisions of a building of the warehouse class or a building used for the purposes of trade or manufacture or separating such buildings and such divisions or buildings (as the case may be) if taken together would extend to more than 7,100 cubic metres, the Council may impose conditions under section 20 of this Act.\n(4A) Subsection (4) of this section shall not apply if the condition in subsection (4B) of this section is satisfied and if—\n(a) the opening conforms with regulations made by the Council for the purposes of this section; or\n(b) the opening is protected from fire by doors or shutters which have a fire resistance of not less than four hours or such lesser period as the Council may specify; or\n(c) the opening satisfies the following conditions—\n(i) its floor jambs and head are formed of brick, stone, iron or other incombustible materials;\n(ii) it is closed by two wrought iron or mild steel doors, sliding doors or shutters each not less than 6 millimetres thick in the panel;\n(iii) all such doors or shutters are located at a distance from each other of the full thickness of the wall, are fitted to grooved or rebated iron frames without woodwork of any kind and are fitted with sufficient and proper bolts or other fastenings which are capable of being opened from either side;\n(iv) all such doors or shutters have on each face styles and rails at least 100 millimetres wide and 6 millimetres thick and are constructed, fitted and maintained in an efficient condition;\n(v) it does not exceed 2.134 metres in width or 2.438 metres in height (or 2.896 metres in height in a wall of which the thickness is not less than 600 millimetres or where the doors, sliding doors or shutters closing the opening are placed at a distance of not less than 600 millimetres from each other).\n(4B) The condition mentioned in subsection (4A) of this section is that the width of any opening in any wall of a storey (or if there is more than one such opening in any such wall the widths of all such openings taken together) shall not exceed one-half of the length of the wall.”\n;and\n(c) in subsection (5) for the words “or any byelaws made in pursuance of those Acts” there were substituted the words “or the Building Regulations 1985.”.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1985/1936/schedule/3/paragraph/3",
    "retrieved_at": "2026-10-29T16:58:08.246296+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}