{"id":4135,"date":"2025-09-21T09:15:01","date_gmt":"2025-09-21T09:15:01","guid":{"rendered":"https:\/\/landsignal.ai\/blog\/?p=4135"},"modified":"2026-02-18T09:45:15","modified_gmt":"2026-02-18T09:45:15","slug":"definitions-of-basement-and-first-floor","status":"publish","type":"post","link":"https:\/\/landsignal.ai\/blog\/definitions-of-basement-and-first-floor\/","title":{"rendered":"Definitions of Basement and First Floor"},"content":{"rendered":"<p><iframe style=\"border-radius: 12px;\" src=\"https:\/\/open.spotify.com\/embed\/episode\/3uAcjmCg7JriFYwYYBmLsj?utm_source=generator\" width=\"100%\" height=\"152\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\" data-testid=\"embed-iframe\"><\/iframe><br \/>\nThe City of Toronto\u2019s Zoning By-law 569-2013 was revised by the Ontario Land Tribunal (OLT) during the Phase 2 appeals hearing. This update clarified the definitions of &#8220;basement&#8221; and &#8220;first floor.&#8221; These revisions clarify how building levels are classified, especially in residential and multi-level buildings, and guarantee the consistent application of zoning regulations throughout the city.<\/p>\n\t\t<div data-elementor-type=\"section\" data-elementor-id=\"1912\" class=\"elementor elementor-1912\" data-elementor-post-type=\"elementor_library\">\n\t\t\t<div class=\"elementor-element elementor-element-a8f9d0a e-flex e-con-boxed e-con e-parent\" data-id=\"a8f9d0a\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-c1bd88f e-con-full e-flex e-con e-child\" data-id=\"c1bd88f\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t<div class=\"elementor-element elementor-element-d8408d6 e-con-full e-flex e-con e-child\" data-id=\"d8408d6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-4f725ea elementor-widget elementor-widget-heading\" data-id=\"4f725ea\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Start Your Project with Confidence<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c605f4a elementor-widget elementor-widget-text-editor\" data-id=\"c605f4a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>At Land Signal, we assist with construction and renovation permits, as well as Garden House and Laneway Suite designs. Let our experts guide you through every step.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-aab80a4 e-con-full e-flex e-con e-child\" data-id=\"aab80a4\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a5caa59 elementor-mobile-align-justify elementor-widget elementor-widget-button\" data-id=\"a5caa59\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/landsignal.ai\/blog\/contact-us\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Free Consultation<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3ee2a46 elementor-mobile-align-justify elementor-widget elementor-widget-button\" data-id=\"3ee2a46\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#form-sec\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Request Free Consultation<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-30a8a35 e-con-full e-flex e-con e-child\" data-id=\"30a8a35\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1950f02 elementor-align-center elementor-widget elementor-widget-lottie\" data-id=\"1950f02\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;source_json&quot;:{&quot;url&quot;:&quot;https:\\\/\\\/landsignal.ai\\\/blog\\\/wp-content\\\/uploads\\\/2025\\\/02\\\/House.json&quot;,&quot;id&quot;:5099,&quot;size&quot;:&quot;&quot;,&quot;alt&quot;:&quot;&quot;,&quot;source&quot;:&quot;library&quot;},&quot;loop&quot;:&quot;yes&quot;,&quot;reverse_animation&quot;:&quot;yes&quot;,&quot;source&quot;:&quot;media_file&quot;,&quot;caption_source&quot;:&quot;none&quot;,&quot;link_to&quot;:&quot;none&quot;,&quot;trigger&quot;:&quot;arriving_to_viewport&quot;,&quot;viewport&quot;:{&quot;unit&quot;:&quot;%&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:{&quot;start&quot;:0,&quot;end&quot;:100}},&quot;play_speed&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:1,&quot;sizes&quot;:[]},&quot;start_point&quot;:{&quot;unit&quot;:&quot;%&quot;,&quot;size&quot;:0,&quot;sizes&quot;:[]},&quot;end_point&quot;:{&quot;unit&quot;:&quot;%&quot;,&quot;size&quot;:100,&quot;sizes&quot;:[]},&quot;renderer&quot;:&quot;svg&quot;}\" data-widget_type=\"lottie.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"e-lottie__container\"><div class=\"e-lottie__animation\"><\/div><\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\n<h2>Previous Definitions (Before the OLT Ruling)<\/h2>\n<p>Under the original wording of Zoning By-law 569-2013, the terms basement and first floor were defined in a simpler but less precise way:<br \/>\n\u2022 <strong>Basement:<\/strong> The portion of a building located between the first floor and any floor below it.<br \/>\n\u2022<strong> First Floor:<\/strong> The floor of a building, excluding any area used for parking, that sits closest in elevation to the <strong>established grade.<\/strong><\/p>\n<p><a href=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture1-7.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter wp-image-4137 \" src=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture1-7.png\" alt=\"Architectural drawing showing a house's side view with labels indicating the &quot;First Floor,&quot; &quot;Basement,&quot; and &quot;Established Grade.&quot;\" width=\"720\" height=\"529\" srcset=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture1-7.png 1605w, https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture1-7-300x220.png 300w, https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture1-7-1024x752.png 1024w, https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture1-7-768x564.png 768w, https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture1-7-1536x1127.png 1536w\" sizes=\"(max-width: 720px) 100vw, 720px\" \/><\/a><\/p>\n<h2>Problems with the Old Definitions<\/h2>\n<p>\u2022 The identification of the basement depended entirely on how the first floor was defined, creating a circular dependency.<br \/>\n\u2022 In split-level or multi-level homes, this approach left ambiguity about whether certain levels should count as basement space or as part of the first floor.<br \/>\n\u2022 This uncertainty directly affected zoning regulations tied to gross floor area (GFA) and the permitted number of storeys.<\/p>\n<h2>Revised Definitions (OLT Decision)<\/h2>\n<p>&nbsp;<\/p>\n<h3>Basement (new):<\/h3>\n<p>Any part of a building where the midpoint between the lowest part of a floor and the bottom of the joists directly above it is lower than:<br \/>\n\u2022 The established grade (in Residential and Residential Apartment zones); or<br \/>\n\u2022 The average elevation of the ground along the front lot line (in all other zones).<\/p>\n<h3>First Floor (new):<\/h3>\n<p>The floor of a building, other than parking space, that is:<br \/>\n\u2022 Directly above a basement; or<br \/>\n\u2022 If there is no basement:<br \/>\no In Residential and Residential Apartment zones, the floor closest to the <strong>established grade.<\/strong><br \/>\no In other zones, the floor closest to the<strong> average elevation along the front lot line.<\/strong><\/p>\n<p>Because the basement definition was restructured, the definition of the first floor also had to be revised for consistency.<br \/>\n\u2022 If a basement exists, the<strong> first floor<\/strong> is now identified as the level directly above it (excluding parking).<br \/>\n\u2022 If there is<strong> no basement<\/strong>:<br \/>\no In Residential and Residential Apartment Zones, the first floor remains the level closest to the <strong>established grade.<\/strong><br \/>\no In all other zones, the first floor is the level closest to the <strong>average elevation of the ground along the front lot line.<\/strong><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/2-1.png\"><img decoding=\"async\" class=\"aligncenter wp-image-4141 size-full\" src=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/2-1.png\" alt=\"1. Architectural drawing of a house's side elevation, showing the new definitions for first floor and basement based on the midpoint relative to established grade.\" width=\"669\" height=\"333\" srcset=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/2-1.png 669w, https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/2-1-300x149.png 300w\" sizes=\"(max-width: 669px) 100vw, 669px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture2-8.png\"><img decoding=\"async\" class=\"aligncenter wp-image-4138 size-full\" src=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture2-8.png\" alt=\"Architectural drawing showing a house's side section view, illustrating how the midpoint between floor and ceiling joists determines the &quot;First Floor&quot; and &quot;Basement.&quot;\" width=\"653\" height=\"745\" srcset=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture2-8.png 653w, https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture2-8-263x300.png 263w\" sizes=\"(max-width: 653px) 100vw, 653px\" \/><\/a><\/p>\n<h2>Why These Changes Happened<\/h2>\n<p>The OLT revisions were introduced to eliminate confusion and ensure the consistent application of zoning rules. The previous definitions complicated the classification of building levels in cases involving split-level or multi-level basements. The updated approach introduces a measurable test that separates basement identification from that of the first floor.<br \/>\n\u2022 <strong>Basements are now measured by elevation<\/strong>. Using the midpoint between the lowest part of a floor and the bottom of the joists above provides a clear, technical standard.<br \/>\n\u2022 <strong>Most basement height remains below grade<\/strong>. This ensures that basements continue to be excluded from gross floor area calculations and are not counted as storeys where zoning limits the number of storeys.<br \/>\n\u2022 <strong>Multi-level basements can be assessed independently.<\/strong> Each level is measured separately, and only the level above the highest basement counts as the first floor.<br \/>\n\u2022 <strong>The first floor is clarified.<\/strong> Once the basement is identified, the first floor is either the level directly above it or, in buildings without a basement, the floor closest to established grade (or to the average elevation along the front lot line in other zones).<\/p>\n<p><a href=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture3-5.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4139 size-full\" src=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture3-5.png\" alt=\"Architectural diagram illustrating a house's side elevation, showing how the midpoint between the floor and ceiling joists determines whether a level is considered a basement or not based on its relationship to the established grade.\" width=\"578\" height=\"750\" srcset=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture3-5.png 578w, https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture3-5-231x300.png 231w\" sizes=\"(max-width: 578px) 100vw, 578px\" \/><\/a><\/p>\n<h2>How the New Definitions Work<\/h2>\n<p>The revised definitions of basement and first floor are applied differently depending on the zoning category.<\/p>\n<h3>Residential and Residential Apartment Zones<\/h3>\n<p>\u2022 If the <strong>midpoint<\/strong> between the lowest part of a floor and the bottom of the ceiling joists directly above is<strong> below established grade<\/strong>, that space is classified as basement.<br \/>\no Basement areas are excluded from gross floor area<strong> (GFA)<\/strong> and do not count as storeys where zoning limits the number of storeys.<br \/>\n\u2022 If the midpoint is above established grade, the space is classified as first floor.<br \/>\no These areas are included in GFA and are counted as storeys where storey limits apply.<br \/>\n\u2022 The phrase \u201clowest part of a floor\u201d refers specifically to the part directly beneath the ceiling joists above, to standardize the measurement.<br \/>\n\u2022 In buildings with multi-level basements, each level must be measured separately to identify the highest basement. The floor immediately above the highest basement is then defined as the<strong> first floor.<\/strong><\/p>\n<h3>Other Zone Categories<\/h3>\n<p>\u2022 In all other zones, the <strong>basement<\/strong> is identified as any part of the building that sits below the <strong>average elevation of the ground along the front lot line.<\/strong><\/p>\n<p><a href=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture4-5.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4140 size-full\" src=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture4-5.png\" alt=\"Architectural diagram illustrating how a section of a floor is considered a basement if its midpoint is below the established grade, while another section is a first floor because its midpoint is above the grade.\" width=\"620\" height=\"571\" srcset=\"https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture4-5.png 620w, https:\/\/landsignal.ai\/blog\/wp-content\/uploads\/2025\/09\/Picture4-5-300x276.png 300w\" sizes=\"(max-width: 620px) 100vw, 620px\" \/><\/a><\/p>\n<h2>Why This Matters<\/h2>\n<p>Accurately identifying basement levels is critical because they are generally excluded from gross floor area calculations, which regulate the overall size or volume of a building.<br \/>\n\u2022 These rules ensure that the majority of basement height remains below grade.<br \/>\n\u2022 They also provide clarity for split-level and multi-level basements, allowing each portion to be evaluated independently. This avoids over-counting and ensures fairness when applying<a href=\"https:\/\/landsignal.ai\/blog\/maximum-number-storieys-triplexes-fourplexes-toronto\/\"> limits on storeys<\/a> and GFA.<\/p>\n<p><strong>Read Also:<\/strong> <a href=\"https:\/\/landsignal.ai\/blog\/laneway-home-vs-basement-suite-toronto\/\">Laneway Home vs. Basement Suite Toronto<\/a><\/p>\n<h2>How Can Land Signal Help<\/h2>\n<p>At <a href=\"https:\/\/landsignal.ai\/\">Land Signal<\/a>, we turn complex zoning regulations into clear, actionable design solutions. No matter the challenges your property presents, we ensure your project is handled efficiently and compliant with all regulations.<br \/>\nWhat Land Signal does:<br \/>\n\u2022 Tailors the best design option for your lot.<br \/>\n\u2022 Manages properties with challenging basement conditions, split-level layouts, or custom ancillary units.<br \/>\n\u2022 Handles all permits, construction, and project delivery.<br \/>\n\u2022 Ensures projects are fully compliant and built with efficiency in mind.<\/p>\n<h2>Final Note<\/h2>\n<p>The Ontario Land Tribunal has updated the definitions of &#8220;basement&#8221; and &#8220;first floor,&#8221; which will make Toronto&#8217;s zoning rules clearer. The new law replaces vague and circular definitions with precise rules based on building height. This makes the law fairer and easier to understand. These changes make it easier to plan with confidence while still respecting zoning limits on size and height.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The City of Toronto\u2019s Zoning By-law 569-2013 was revised by the Ontario Land Tribunal (OLT) during the Phase 2 appeals [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":4136,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[6,16],"tags":[],"class_list":["post-4135","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-house-zoning"],"_links":{"self":[{"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/posts\/4135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/comments?post=4135"}],"version-history":[{"count":0,"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/posts\/4135\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/media\/4136"}],"wp:attachment":[{"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/media?parent=4135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/categories?post=4135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/tags?post=4135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}