{
 "id": "hp_pd_order_2025",
 "name": "The Town and Country Planning (General Permitted Development) (England) (Amendment) Order 2025",
 "category": "heat_pump_noise",
 "value_num": null,
 "display": "In force 29 May 2025: MCS 020 a) is the only standard that counts, and a detached house may have two heat pumps",
 "unit": "statutory instrument, England",
 "period_start": "2025-05-29",
 "period_end": null,
 "period_kind": "data",
 "deadline": null,
 "source_url": "https://www.legislation.gov.uk/uksi/2025/560/made",
 "source_org": "legislation.gov.uk, SI 2025/560",
 "checked_at": "2026-09-30",
 "recheck_by": "2026-12-29",
 "history": [],
 "public_note": "The law that changed the rules in England came into force on 29 May 2025. It made MCS 020 a) the only standard that counts, removing the words \"or equivalent standards\". It allows up to two air source heat pumps on a detached house and one on any other house or a block of flats. Installations that met the old rules could still go ahead under them until the end of 28 May 2026. That window has now closed.",
 "next": null,
 "url": "https://hearthsum.co.uk/api/hp_pd_order_2025.json"
}