{
  "query": {
    "country": "GB",
    "measure": "heat_pump",
    "technology": "ground_source"
  },
  "status": "ok",
  "price": {
    "currency": "GBP",
    "unit": "per installation",
    "value": 27232,
    "measure": "median",
    "median": 27232,
    "typical_low": null,
    "typical_high": null,
    "min": null,
    "max": null
  },
  "sample_size": null,
  "period": {
    "from": "2026-04-01",
    "to": "2026-06-30"
  },
  "confidence": "high",
  "price_type": "official_statistic",
  "statistic": {
    "measure": "median",
    "reference_period": "2026 Q2",
    "note": "Reported installation cost at grant redemption (MCS certificate), as the installer declared it; not a quote."
  },
  "as_of": "2026-10-15T19:27:58.223Z",
  "source": {
    "id": "gb-bus-stats",
    "name": "Boiler Upgrade Scheme statistics",
    "publisher": "Department for Energy Security and Net Zero (DESNZ), with data from Ofgem and the Microgeneration Certification Scheme",
    "licence": "Open Government Licence v3.0 (GOV.UK: \"All content is available under the Open Government Licence v3.0, except where otherwise stated\"); Crown copyright",
    "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: Department for Energy Security and Net Zero, Boiler Upgrade Scheme statistics (data from Ofgem and the Microgeneration Certification Scheme).",
    "url": "https://www.gov.uk/government/collections/boiler-upgrade-scheme-statistics"
  },
  "method": "DESNZ publishes, for every quarter, the median and the lower and upper quartile of the installation cost reported on the MCS certificate for homes that received a Boiler Upgrade Scheme grant, per technology. We pass on the ground source heat pump figures for 2026 Q2, unchanged. DESNZ gives no number of installations for the quarter. Costs are self-reported by installers, not receipts or quotes.",
  "method_url": "https://proofprice.com/method",
  "summary": "Reported installed cost of a ground source heat pump with a Boiler Upgrade Scheme grant in England and Wales: median £27,232 (middle half of installations: £18,136 to £42,110), as declared by installers on the MCS certificate. Official median published by Department for Energy Security and Net Zero (DESNZ), with data from Ofgem and the Microgeneration Certification Scheme for 2026 Q2.",
  "notice": "Information, not a valuation or offer. Ranges describe past recorded prices.",
  "extra": {
    "price_basis": "installer-reported installation cost on the MCS certificate for homes that took a Boiler Upgrade Scheme grant: not a receipt or a quote",
    "technology": "ground source heat pump",
    "quarter": "2026 Q2",
    "grant_note": "DESNZ note 4: costs are self-reported by installers and include the system, labour and VAT; they should include the grant value (up to £7,500 for heat pumps) but installers may read this differently, so check before subtracting the grant.",
    "lower_quartile": 18136,
    "upper_quartile": 42110,
    "median_capacity_kw": 10.5,
    "quartile_note": "lower_quartile and upper_quartile are the 25th and 75th percentiles of reported costs, not the 10th and 90th."
  },
  "answer_id": "ans_a99d181ab216e6b2969e",
  "method_version": "1",
  "retrieved_at": "2026-10-15T19:27:58.224Z",
  "evidence": {
    "type": "official_statistic",
    "label": "Official published median",
    "meaning": "One average or median that a statistics office or regulator publishes for a reference period: it describes a group, not a distribution, and says nothing about any single price."
  },
  "reliability": "official_median_no_count",
  "data_as_of": "2026-06-30",
  "data_age_days": 107,
  "suggestions": [
    "This is one published average or median with no record count: use it as a reference point, not as a range of what individuals paid.",
    "For a decision on a specific job or purchase, ask for an itemised quote."
  ]
}