{"name":"BuildRules permit index: London","canonical_url":"https://buildrules.ca/permit-index/london","generated_at":"2026-10-07T08:26:34.725Z","latest_verified":"2026-10-01","coverage":{"cities":1,"project_types":5,"city_project_answers":5,"official_source_urls":3},"methodology_url":"https://buildrules.ca/methodology","source_directory_url":"https://buildrules.ca/sources","records":[{"city":"London","city_slug":"london","province":"Ontario","project":"Additional residential unit","project_slug":"secondary-suite-permit","question":"Do you need a permit for an ARU or basement apartment in London, Ontario?","guidance_status":"Depends on project conditions","direct_answer":"A building permit is required for every new ARU, whether it is an interior/basement conversion, converted garage, addition or detached unit.","last_verified":"2026-10-01","official_source_count":1,"official_source_urls":["https://london.ca/living-london/building-renovating/additional-residential-units"],"buildrules_url":"https://buildrules.ca/london/secondary-suite-permit"},{"city":"London","city_slug":"london","province":"Ontario","project":"Basement renovation","project_slug":"basement-renovation-permit","question":"Do you need a permit to renovate a basement in London, Ontario?","guidance_status":"Depends on project conditions","direct_answer":"London requires permits for basement finishing that creates rooms or living space, basement apartments, excavation to increase headroom and below-grade entrances.","last_verified":"2026-10-01","official_source_count":1,"official_source_urls":["https://london.ca/living-london/building-renovating/building-permits/you-apply-building-permit"],"buildrules_url":"https://buildrules.ca/london/basement-renovation-permit"},{"city":"London","city_slug":"london","province":"Ontario","project":"Deck","project_slug":"deck-permit","question":"Do you need a permit for a deck in London, Ontario?","guidance_status":"Depends on project conditions","direct_answer":"A side or rear deck under 600 mm can be permit-exempt only when it is not attached to the house; an attached low deck still requires a permit.","last_verified":"2026-10-01","official_source_count":2,"official_source_urls":["https://london.ca/living-london/building-renovating/common-homeowner-projects","https://london.ca/living-london/building-renovating/building-permits/you-apply-building-permit"],"buildrules_url":"https://buildrules.ca/london/deck-permit"},{"city":"London","city_slug":"london","province":"Ontario","project":"Home addition","project_slug":"home-addition-permit","question":"Do you need a permit for a home addition in London, Ontario?","guidance_status":"Depends on project conditions","direct_answer":"Yes. London lists additions to existing buildings among projects that require a building permit.","last_verified":"2026-10-01","official_source_count":1,"official_source_urls":["https://london.ca/living-london/building-renovating/building-permits/you-apply-building-permit"],"buildrules_url":"https://buildrules.ca/london/home-addition-permit"},{"city":"London","city_slug":"london","province":"Ontario","project":"Shed","project_slug":"shed-permit","question":"Do you need a permit for a shed in London, Ontario?","guidance_status":"Depends on project conditions","direct_answer":"A shed can be permit-exempt when it is under 15 m², one storey, free-standing, storage-only and has no plumbing.","last_verified":"2026-10-01","official_source_count":1,"official_source_urls":["https://london.ca/living-london/building-renovating/building-permits/you-apply-building-permit"],"buildrules_url":"https://buildrules.ca/london/shed-permit"}]}