{
  "schema": 1,
  "slug": "london-flood-zones",
  "title": "Homes in each flood zone, by London borough",
  "countedOn": "2026-10-05",
  "research": {
    "branch": "research/london-flood-count",
    "commit": "44cbc02d"
  },
  "homesDefinition": "A home is a London address with at least one domestic Energy Performance Certificate on the government register (2008 to 1 October 2026), placed at its Ordnance Survey address point.",
  "coverage": {
    "register": "VOA Council Tax: stock of properties 2026, table CTSOP1.1",
    "asAt": "2026-03-31",
    "published": "2026-09-24"
  },
  "sources": [
    {
      "key": "zones",
      "role": "Flood zone",
      "name": "Flood Map for Planning – Flood Zones (NaFRA2)",
      "creator": "Environment Agency",
      "edition": "Published 25 March 2025; dataset revision 20 May 2026; national file posted 21 September 2026",
      "revision": "2026-05-20",
      "url": "https://environment.data.gov.uk/dataset/04532375-a198-476e-985e-0579a0a11b47",
      "attribution": "Contains Environment Agency information © Environment Agency and/or database right 2026."
    },
    {
      "key": "bands",
      "role": "Risk band",
      "name": "Risk of Flooding from Rivers and Sea (NaFRA2)",
      "creator": "Environment Agency",
      "edition": "Published 28 January 2025; dataset modified 18 June 2026; area downloads taken 5 October 2026",
      "revision": "2026-06-18",
      "url": "https://environment.data.gov.uk/dataset/96ab4342-82c1-4095-87f1-0082e8d84ef1",
      "attribution": "Contains Environment Agency information © Environment Agency and/or database right 2026."
    },
    {
      "key": "homes",
      "role": "Homes",
      "name": "Energy Performance of Buildings register, domestic certificates",
      "creator": "Ministry of Housing, Communities and Local Government",
      "edition": "Bulk file regenerated 1 October 2026; certificates lodged 2008 to 2026",
      "revision": "2026-10-01",
      "url": "https://get-energy-performance-data.communities.gov.uk/",
      "attribution": "Energy Performance of Buildings Data, Ministry of Housing, Communities and Local Government."
    },
    {
      "key": "points",
      "role": "Address points",
      "name": "OS Open UPRN",
      "creator": "Ordnance Survey",
      "edition": "September 2026 release",
      "revision": "2026-09",
      "url": "https://www.ordnancesurvey.co.uk/products/os-open-uprn",
      "attribution": "Contains OS data © Crown copyright and database right 2026."
    },
    {
      "key": "boroughs",
      "role": "Borough boundaries",
      "name": "Local Authority Districts (May 2026) Boundaries UK BFE",
      "creator": "Office for National Statistics",
      "edition": "May 2026",
      "revision": "2026-05",
      "url": "https://geoportal.statistics.gov.uk/",
      "attribution": "Source: Office for National Statistics licensed under the Open Government Licence v3.0. Contains OS data © Crown copyright and database right 2026."
    },
    {
      "key": "coverage",
      "role": "Dwellings (coverage only)",
      "name": "Council Tax: stock of properties 2026, table CTSOP1.1",
      "creator": "Valuation Office Agency",
      "edition": "Dwellings at 31 March 2026, published 24 September 2026",
      "revision": "2026-09-24",
      "url": "https://www.gov.uk/government/statistics/council-tax-stock-of-properties-2026",
      "attribution": "© Crown copyright, Valuation Office Agency."
    }
  ],
  "boroughs": [
    {
      "code": "E09000001",
      "borough": "City of London",
      "homes": 5640,
      "dwellings": 8050,
      "coveragePct": 70.1,
      "zone1": 4965,
      "zone2": 3,
      "zone3": 672,
      "z3VeryLowInside": 324,
      "z3VeryLowOutside": 348,
      "z3Low": 0,
      "z3Medium": 0,
      "z3High": 0
    },
    {
      "code": "E09000002",
      "borough": "Barking and Dagenham",
      "homes": 65534,
      "dwellings": 82480,
      "coveragePct": 79.5,
      "zone1": 51736,
      "zone2": 2252,
      "zone3": 11546,
      "z3VeryLowInside": 1591,
      "z3VeryLowOutside": 1359,
      "z3Low": 7943,
      "z3Medium": 573,
      "z3High": 80
    },
    {
      "code": "E09000003",
      "borough": "Barnet",
      "homes": 125725,
      "dwellings": 162740,
      "coveragePct": 77.3,
      "zone1": 122119,
      "zone2": 1865,
      "zone3": 1741,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 102,
      "z3Low": 220,
      "z3Medium": 607,
      "z3High": 812
    },
    {
      "code": "E09000004",
      "borough": "Bexley",
      "homes": 72075,
      "dwellings": 101950,
      "coveragePct": 70.7,
      "zone1": 60715,
      "zone2": 1329,
      "zone3": 10031,
      "z3VeryLowInside": 8351,
      "z3VeryLowOutside": 752,
      "z3Low": 349,
      "z3Medium": 157,
      "z3High": 422
    },
    {
      "code": "E09000005",
      "borough": "Brent",
      "homes": 98612,
      "dwellings": 136810,
      "coveragePct": 72.1,
      "zone1": 94292,
      "zone2": 2458,
      "zone3": 1862,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 0,
      "z3Low": 52,
      "z3Medium": 1150,
      "z3High": 660
    },
    {
      "code": "E09000006",
      "borough": "Bromley",
      "homes": 100560,
      "dwellings": 143690,
      "coveragePct": 70,
      "zone1": 95784,
      "zone2": 2548,
      "zone3": 2228,
      "z3VeryLowInside": 49,
      "z3VeryLowOutside": 16,
      "z3Low": 39,
      "z3Medium": 667,
      "z3High": 1457
    },
    {
      "code": "E09000007",
      "borough": "Camden",
      "homes": 80018,
      "dwellings": 114360,
      "coveragePct": 70,
      "zone1": 80018,
      "zone2": 0,
      "zone3": 0,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 0,
      "z3Low": 0,
      "z3Medium": 0,
      "z3High": 0
    },
    {
      "code": "E09000008",
      "borough": "Croydon",
      "homes": 123520,
      "dwellings": 169360,
      "coveragePct": 72.9,
      "zone1": 119352,
      "zone2": 1232,
      "zone3": 2936,
      "z3VeryLowInside": 5,
      "z3VeryLowOutside": 1,
      "z3Low": 17,
      "z3Medium": 665,
      "z3High": 2248
    },
    {
      "code": "E09000009",
      "borough": "Ealing",
      "homes": 113117,
      "dwellings": 151160,
      "coveragePct": 74.8,
      "zone1": 110673,
      "zone2": 973,
      "zone3": 1471,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 904,
      "z3Low": 1,
      "z3Medium": 291,
      "z3High": 275
    },
    {
      "code": "E09000010",
      "borough": "Enfield",
      "homes": 94977,
      "dwellings": 128970,
      "coveragePct": 73.6,
      "zone1": 84128,
      "zone2": 9330,
      "zone3": 1519,
      "z3VeryLowInside": 289,
      "z3VeryLowOutside": 64,
      "z3Low": 352,
      "z3Medium": 621,
      "z3High": 193
    },
    {
      "code": "E09000011",
      "borough": "Greenwich",
      "homes": 98306,
      "dwellings": 127000,
      "coveragePct": 77.4,
      "zone1": 68895,
      "zone2": 4238,
      "zone3": 25173,
      "z3VeryLowInside": 15494,
      "z3VeryLowOutside": 6876,
      "z3Low": 732,
      "z3Medium": 1159,
      "z3High": 912
    },
    {
      "code": "E09000012",
      "borough": "Hackney",
      "homes": 88585,
      "dwellings": 121100,
      "coveragePct": 73.2,
      "zone1": 85824,
      "zone2": 1034,
      "zone3": 1727,
      "z3VeryLowInside": 503,
      "z3VeryLowOutside": 0,
      "z3Low": 382,
      "z3Medium": 15,
      "z3High": 827
    },
    {
      "code": "E09000013",
      "borough": "Hammersmith and Fulham",
      "homes": 73862,
      "dwellings": 96270,
      "coveragePct": 76.7,
      "zone1": 23009,
      "zone2": 6361,
      "zone3": 44492,
      "z3VeryLowInside": 9808,
      "z3VeryLowOutside": 34684,
      "z3Low": 0,
      "z3Medium": 0,
      "z3High": 0
    },
    {
      "code": "E09000014",
      "borough": "Haringey",
      "homes": 85842,
      "dwellings": 115610,
      "coveragePct": 74.3,
      "zone1": 74713,
      "zone2": 9227,
      "zone3": 1902,
      "z3VeryLowInside": 941,
      "z3VeryLowOutside": 486,
      "z3Low": 475,
      "z3Medium": 0,
      "z3High": 0
    },
    {
      "code": "E09000015",
      "borough": "Harrow",
      "homes": 68799,
      "dwellings": 97620,
      "coveragePct": 70.5,
      "zone1": 65743,
      "zone2": 1586,
      "zone3": 1470,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 203,
      "z3Low": 339,
      "z3Medium": 441,
      "z3High": 487
    },
    {
      "code": "E09000016",
      "borough": "Havering",
      "homes": 77069,
      "dwellings": 109070,
      "coveragePct": 70.7,
      "zone1": 71576,
      "zone2": 2881,
      "zone3": 2612,
      "z3VeryLowInside": 1219,
      "z3VeryLowOutside": 74,
      "z3Low": 1224,
      "z3Medium": 31,
      "z3High": 64
    },
    {
      "code": "E09000017",
      "borough": "Hillingdon",
      "homes": 86614,
      "dwellings": 119060,
      "coveragePct": 72.7,
      "zone1": 82906,
      "zone2": 2554,
      "zone3": 1154,
      "z3VeryLowInside": 17,
      "z3VeryLowOutside": 12,
      "z3Low": 30,
      "z3Medium": 482,
      "z3High": 613
    },
    {
      "code": "E09000018",
      "borough": "Hounslow",
      "homes": 80857,
      "dwellings": 112470,
      "coveragePct": 71.9,
      "zone1": 68458,
      "zone2": 1786,
      "zone3": 10613,
      "z3VeryLowInside": 2268,
      "z3VeryLowOutside": 7383,
      "z3Low": 546,
      "z3Medium": 59,
      "z3High": 357
    },
    {
      "code": "E09000019",
      "borough": "Islington",
      "homes": 80865,
      "dwellings": 112310,
      "coveragePct": 72,
      "zone1": 80865,
      "zone2": 0,
      "zone3": 0,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 0,
      "z3Low": 0,
      "z3Medium": 0,
      "z3High": 0
    },
    {
      "code": "E09000020",
      "borough": "Kensington and Chelsea",
      "homes": 69193,
      "dwellings": 89660,
      "coveragePct": 77.2,
      "zone1": 65003,
      "zone2": 1710,
      "zone3": 2480,
      "z3VeryLowInside": 676,
      "z3VeryLowOutside": 1804,
      "z3Low": 0,
      "z3Medium": 0,
      "z3High": 0
    },
    {
      "code": "E09000021",
      "borough": "Kingston upon Thames",
      "homes": 53347,
      "dwellings": 70650,
      "coveragePct": 75.5,
      "zone1": 46603,
      "zone2": 3908,
      "zone3": 2836,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 20,
      "z3Low": 1,
      "z3Medium": 2057,
      "z3High": 758
    },
    {
      "code": "E09000022",
      "borough": "Lambeth",
      "homes": 120019,
      "dwellings": 149490,
      "coveragePct": 80.3,
      "zone1": 98481,
      "zone2": 1180,
      "zone3": 20358,
      "z3VeryLowInside": 13346,
      "z3VeryLowOutside": 6598,
      "z3Low": 1,
      "z3Medium": 164,
      "z3High": 249
    },
    {
      "code": "E09000023",
      "borough": "Lewisham",
      "homes": 106720,
      "dwellings": 134760,
      "coveragePct": 79.2,
      "zone1": 84773,
      "zone2": 4858,
      "zone3": 17089,
      "z3VeryLowInside": 8232,
      "z3VeryLowOutside": 3822,
      "z3Low": 619,
      "z3Medium": 1820,
      "z3High": 2596
    },
    {
      "code": "E09000024",
      "borough": "Merton",
      "homes": 66632,
      "dwellings": 87910,
      "coveragePct": 75.8,
      "zone1": 61287,
      "zone2": 3388,
      "zone3": 1957,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 0,
      "z3Low": 334,
      "z3Medium": 1106,
      "z3High": 517
    },
    {
      "code": "E09000025",
      "borough": "Newham",
      "homes": 110976,
      "dwellings": 134000,
      "coveragePct": 82.8,
      "zone1": 58067,
      "zone2": 5086,
      "zone3": 47823,
      "z3VeryLowInside": 25809,
      "z3VeryLowOutside": 13278,
      "z3Low": 8734,
      "z3Medium": 0,
      "z3High": 2
    },
    {
      "code": "E09000026",
      "borough": "Redbridge",
      "homes": 77566,
      "dwellings": 108740,
      "coveragePct": 71.3,
      "zone1": 73887,
      "zone2": 2234,
      "zone3": 1445,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 0,
      "z3Low": 218,
      "z3Medium": 481,
      "z3High": 746
    },
    {
      "code": "E09000027",
      "borough": "Richmond upon Thames",
      "homes": 62034,
      "dwellings": 85870,
      "coveragePct": 72.2,
      "zone1": 47821,
      "zone2": 4766,
      "zone3": 9447,
      "z3VeryLowInside": 5125,
      "z3VeryLowOutside": 1217,
      "z3Low": 1672,
      "z3Medium": 467,
      "z3High": 966
    },
    {
      "code": "E09000028",
      "borough": "Southwark",
      "homes": 112134,
      "dwellings": 151430,
      "coveragePct": 74.1,
      "zone1": 40582,
      "zone2": 4964,
      "zone3": 66588,
      "z3VeryLowInside": 49628,
      "z3VeryLowOutside": 16960,
      "z3Low": 0,
      "z3Medium": 0,
      "z3High": 0
    },
    {
      "code": "E09000029",
      "borough": "Sutton",
      "homes": 63381,
      "dwellings": 86510,
      "coveragePct": 73.3,
      "zone1": 61673,
      "zone2": 1457,
      "zone3": 251,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 0,
      "z3Low": 1,
      "z3Medium": 121,
      "z3High": 129
    },
    {
      "code": "E09000030",
      "borough": "Tower Hamlets",
      "homes": 125069,
      "dwellings": 151530,
      "coveragePct": 82.5,
      "zone1": 80008,
      "zone2": 586,
      "zone3": 44475,
      "z3VeryLowInside": 25297,
      "z3VeryLowOutside": 18206,
      "z3Low": 111,
      "z3Medium": 72,
      "z3High": 789
    },
    {
      "code": "E09000031",
      "borough": "Waltham Forest",
      "homes": 84858,
      "dwellings": 111800,
      "coveragePct": 75.9,
      "zone1": 80663,
      "zone2": 2920,
      "zone3": 1275,
      "z3VeryLowInside": 0,
      "z3VeryLowOutside": 0,
      "z3Low": 62,
      "z3Medium": 628,
      "z3High": 585
    },
    {
      "code": "E09000032",
      "borough": "Wandsworth",
      "homes": 122301,
      "dwellings": 159360,
      "coveragePct": 76.7,
      "zone1": 83619,
      "zone2": 4026,
      "zone3": 34656,
      "z3VeryLowInside": 15984,
      "z3VeryLowOutside": 12386,
      "z3Low": 3770,
      "z3Medium": 1774,
      "z3High": 742
    },
    {
      "code": "E09000033",
      "borough": "Westminster",
      "homes": 102405,
      "dwellings": 131940,
      "coveragePct": 77.6,
      "zone1": 81892,
      "zone2": 295,
      "zone3": 20218,
      "z3VeryLowInside": 12431,
      "z3VeryLowOutside": 7787,
      "z3Low": 0,
      "z3Medium": 0,
      "z3High": 0
    }
  ],
  "london": {
    "code": "E12000007",
    "borough": "London (33 boroughs)",
    "homes": 2897212,
    "dwellings": 3863730,
    "coveragePct": 75,
    "zone1": 2410130,
    "zone2": 93035,
    "zone3": 394047,
    "z3VeryLowInside": 197387,
    "z3VeryLowOutside": 135342,
    "z3Low": 28224,
    "z3Medium": 15608,
    "z3High": 17486
  }
}