{
  "table": "price-per-square-metre-calculator-rules",
  "schema": 1,
  "version": "2026-11-11.1",
  "title": "Floor-area rules for a price per square metre: France and United Kingdom",
  "doc": "Rule table read by the price-per-square-metre-calculator handler (ctx.data['price-per-square-metre-calculator-rules']). The price per square metre itself is plain division and needs nothing from here. France: the rules of the loi Carrez that the optional area check applies to a lot in a copropriété (the one-twentieth tolerance, the 8 m² floor below which a lot is not counted, the 1.80 m height below which floor is not counted, the one-year limit on the buyer's claim, the one-month limit on a claim for nullity, and the rule that a larger area gives no extra price). United Kingdom: the square foot in square metres, from the statutory definition of the yard, and the fact that no floor-area tolerance is set by law. Table-level valid_from/valid_until bound the period during which this version may be relied on; these rules have not changed since 2014 (France) and 1995 (United Kingdom), and the table is reviewed again by 30 June 2027. Entry-level valid_from/valid_until bound each value; a null valid_until means in force until changed. source_url is the primary source, source_date that source's own date (the date of the version in force, or the date the source says it was up to date), retrieved the date the value was read there.",
  "reviewed_on": "2026-11-11",
  "reviewed_by": "apps-calculators agent (automated research against official sources, 2026-11-11); owner review pending",
  "valid_from": "2026-11-11",
  "valid_until": "2027-06-30",
  "locale_country": {
    "fr-FR": "FR",
    "en-GB": "GB"
  },
  "countries": {
    "FR": {
      "name": {
        "fr-FR": "France",
        "en-GB": "France"
      },
      "currency": "EUR",
      "area_unit": "m2",
      "carrez": {
        "scope": {
          "fr-FR": "Vente d’un lot ou d’une fraction de lot de copropriété. Ne s’applique ni aux caves, garages et emplacements de stationnement, ni aux lots de moins de 8 m².",
          "en-GB": "Sale of a lot, or part of a lot, in a copropriété (a building in co-ownership). Does not apply to cellars, garages, parking spaces or lots under 8 m²."
        },
        "tolerance": {
          "numerator": 1,
          "denominator": 20,
          "percent": "5",
          "rule": "If the private area is more than one-twentieth below the area stated in the deed, the seller bears, at the buyer's request, a reduction of the price proportional to the shortfall: reduction = price × (stated − measured) ÷ stated. An area exactly one-twentieth below gives no reduction.",
          "legal_basis": "Loi n° 65-557 du 10 juillet 1965, art. 46, al. 7",
          "valid_from": "2014-12-22",
          "valid_until": null,
          "source_url": "https://www.legifrance.gouv.fr/loda/article_lc/LEGIARTI000029946555",
          "source_date": "2014-12-22",
          "retrieved": "2026-11-11"
        },
        "min_lot_area_m2": {
          "value": "8",
          "rule": "Lots or parts of lots with an area under 8 m² are not counted in the private area.",
          "legal_basis": "Décret n° 67-223 du 17 mars 1967, art. 4-2; loi n° 65-557, art. 46, al. 3",
          "valid_from": "1997-05-29",
          "valid_until": null,
          "source_url": "https://www.legifrance.gouv.fr/loda/article_lc/LEGIARTI000006488239",
          "source_date": "1997-05-29",
          "retrieved": "2026-11-11"
        },
        "min_ceiling_height_m": {
          "value": "1.80",
          "rule": "The private area is the floor area of enclosed and covered rooms, less walls, partitions, steps and stairwells, ducts, and door and window recesses; floor under a height of less than 1.80 m is not counted.",
          "legal_basis": "Décret n° 67-223 du 17 mars 1967, art. 4-1",
          "valid_from": "1997-05-29",
          "valid_until": null,
          "source_url": "https://www.legifrance.gouv.fr/loda/article_lc/LEGIARTI000006488230",
          "source_date": "1997-05-29",
          "retrieved": "2026-11-11"
        },
        "reduction_claim_months": {
          "value": 12,
          "rule": "The buyer's claim for a price reduction must be brought within one year of the authentic deed of sale, or it is lost.",
          "legal_basis": "Loi n° 65-557 du 10 juillet 1965, art. 46, al. 8",
          "valid_from": "2014-12-22",
          "valid_until": null,
          "source_url": "https://www.legifrance.gouv.fr/loda/article_lc/LEGIARTI000029946555",
          "source_date": "2014-12-22",
          "retrieved": "2026-11-11"
        },
        "nullity_claim_months": {
          "value": 1,
          "rule": "When the area is missing from the contract, the buyer may claim nullity no later than one month after the authentic deed; signing a deed that states the area ends that claim.",
          "legal_basis": "Loi n° 65-557 du 10 juillet 1965, art. 46, al. 4 et 5",
          "valid_from": "2014-12-22",
          "valid_until": null,
          "source_url": "https://www.legifrance.gouv.fr/loda/article_lc/LEGIARTI000029946555",
          "source_date": "2014-12-22",
          "retrieved": "2026-11-11"
        },
        "excess_gives_supplement": {
          "value": false,
          "rule": "An area larger than the one stated in the deed gives rise to no extra price.",
          "legal_basis": "Loi n° 65-557 du 10 juillet 1965, art. 46, al. 6",
          "valid_from": "2014-12-22",
          "valid_until": null,
          "source_url": "https://www.legifrance.gouv.fr/loda/article_lc/LEGIARTI000029946555",
          "source_date": "2014-12-22",
          "retrieved": "2026-11-11"
        }
      }
    },
    "GB": {
      "name": {
        "fr-FR": "Royaume-Uni",
        "en-GB": "United Kingdom"
      },
      "currency": "GBP",
      "area_unit": "m2",
      "square_foot_m2": {
        "value": "0.09290304",
        "rule": "Yard = 0.9144 metre; foot = 1/3 yard; square foot = 1/9 square yard. So 1 square foot = 0.9144² ÷ 9 = 0.09290304 square metre exactly.",
        "legal_basis": "Weights and Measures Act 1985, Schedule 1, Part VI (as substituted by S.I. 1994/2867 from 1 October 1995); the Product Regulation and Metrology Act 2025, s. 11(3), will omit Schedule 1 but was not in force on 11 November 2026",
        "valid_from": "1995-10-01",
        "valid_until": null,
        "source_url": "https://www.legislation.gov.uk/ukpga/1985/72/schedule/1",
        "source_date": "2026-11-08",
        "retrieved": "2026-11-11"
      },
      "area_tolerance": {
        "value": null,
        "rule": "No statute sets a floor-area tolerance or a price reduction for a home sold with a smaller area than stated, as France's loi Carrez does. Traders, estate agents included, must not give false or misleading information relevant to a consumer's decision.",
        "legal_basis": "Digital Markets, Competition and Consumers Act 2024, section 226 (misleading actions), in force from 6 April 2025",
        "valid_from": "2025-04-06",
        "valid_until": null,
        "source_url": "https://www.legislation.gov.uk/ukpga/2024/13/section/226",
        "source_date": "2025-04-06",
        "retrieved": "2026-11-11"
      }
    }
  }
}