{"schemaVersion":"1.0","id":"what-grade","dataset":"heritage-grades","title":"What grade","description":"Almost everything listed is Grade II.","methodology":"London's listed buildings by grade. Grade I is exceptional interest, Grade II* particularly important, Grade II of special interest — and the last accounts for the overwhelming majority everywhere, which is why a Grade I listing is the rarity it is. A small number of entries carry no grade in the register and are shown as such rather than folded into Grade II.","category":"housing","categoryLabel":"Housing","cadence":"monthly","placeholder":false,"landingPage":"https://londongraph.com/g/what-grade","markdown":"https://londongraph.com/g/what-grade/index.html.md","source":{"name":"MHCLG","url":"https://www.planning.data.gov.uk/","licence":"Open Government Licence v3.0","licenceUrl":"https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/"},"updatedAt":"2026-07-31T23:58:59.016Z","release":{"label":null,"publishedAt":null,"resourceUrl":null,"methodologyUrl":null,"sha256":null},"observations":[{"series":"circle","buckets":["Grade I"],"values":[0.0311],"unit":"share of listed buildings","metadata":[{}]},{"series":"elizabeth","buckets":["Grade II*"],"values":[0.0743],"unit":"share of listed buildings","metadata":[{}]},{"series":"jubilee","buckets":["Grade not stated"],"values":[0.0082],"unit":"share of listed buildings","metadata":[{}]},{"series":"victoria","buckets":["Grade II"],"values":[0.8864],"unit":"share of listed buildings","metadata":[{}]}],"areaStatistics":null,"visualizations":[{"id":"overview","label":"Composition","description":"Almost everything listed is Grade II.","url":"https://londongraph.com/g/what-grade","renderer":"primary","default":true,"timeControl":"inherit","datasets":[],"transform":null,"controls":null,"metrics":[],"caveat":null},{"id":"ordered-share","label":"Ordered shares","description":"Compare every part on one common 0–100 scale.","url":"https://londongraph.com/g/what-grade?view=ordered-share","renderer":"composition-bars","default":false,"timeControl":"inherit","datasets":[],"transform":null,"controls":null,"metrics":[],"caveat":null},{"id":"treemap","label":"Treemap","description":"Use area to show each category's contribution to the total.","url":"https://londongraph.com/g/what-grade?view=treemap","renderer":"treemap","default":false,"timeControl":"inherit","datasets":[],"transform":null,"controls":null,"metrics":[],"caveat":null}],"availability":"observations","note":"The release is complete for the measures represented on the graph page."}