{
  "url": "https://openlegislation.uk/building-regulations-2010/regulation-42",
  "json_url": "https://openlegislation.uk/building-regulations-2010/regulation-42.json",
  "legislation": "uksi/2010/2214",
  "legislation_title": "The Building Regulations 2010",
  "legislation_url": "https://openlegislation.uk/building-regulations-2010",
  "path": "regulation/42",
  "kind": "regulation",
  "number": "42",
  "heading": "Mechanical ventilation air flow rate testing",
  "text": "(1) This regulation applies where paragraph F1(1) of Schedule 1 imposes a requirement in relation to the creation of a new dwelling by building work.\n(2) The person carrying out the work shall, for the purpose of ensuring compliance with paragraph F1(1) of Schedule 1—\n(a) ensure that testing of the mechanical ventilation air flow rate is carried out in accordance with a procedure approved by the Secretary of State; and\n(b) give notice of the results of the testing to the building control authority .\n(3) The notice referred to in paragraph (2)(b) shall—\n(a) record the results and the data upon which they are based in a manner approved by the Secretary of State; and\n(b) be given to the building control authority not later than five days after the final test is carried out.\n(4) Where the regulator is the building control authority by virtue of section 91ZB of the Act (the regulator: building control authority for other work), it must send a copy of each notice it receives under this regulation in relation to a building to the local authority for the area in which the building is situated.",
  "extent": "E",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Words in reg. 42(2) substituted (E.) (1.10.2023) by The Building Regulations etc. (Amendment) (England) Regulations 2023 (S.I. 2023/911), regs. 1(2), 7(17)(a) (with regs. 22-24)"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Words in reg. 42(3) substituted (E.) (1.10.2023) by The Building Regulations etc. (Amendment) (England) Regulations 2023 (S.I. 2023/911), regs. 1(2), 7(17)(a) (with regs. 22-24)"
    },
    {
      "type": "F",
      "label": "F3",
      "text": "Reg. 42(4) inserted (E.) (1.10.2023) by The Building Regulations etc. (Amendment) (England) Regulations 2023 (S.I. 2023/911), regs. 1(2), 7(17)(b) (with regs. 22-24)"
    },
    {
      "type": "C",
      "label": "C1",
      "text": "Reg. 42 applied (with modifications) (1.10.2010) by The Building (Approved Inspectors etc.) Regulations 2010 (S.I. 2010/2215), regs. 1, 20(1)"
    },
    {
      "type": "C",
      "label": "C2",
      "text": "Reg. 42 modified (E.) (6.4.2024) by The Building (Registered Building Control Approvers etc.) (England) Regulations 2024 (S.I. 2024/110), regs. 1(3), 5(2)(3) (with regs. 44-47)"
    },
    {
      "type": "E",
      "label": "E1",
      "text": "This version of this provision applies to England only; a separate version has been created for Wales only"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2010/2214/regulation/42",
    "retrieved_at": "2026-10-29T02:31:48.980832+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."
}