{"id":3993,"date":"2025-09-15T07:03:24","date_gmt":"2025-09-15T07:03:24","guid":{"rendered":"https:\/\/landsignal.ai\/blog\/?p=3993"},"modified":"2026-02-10T13:23:24","modified_gmt":"2026-02-10T13:23:24","slug":"maximum-number-storieys-triplexes-fourplexes-toronto","status":"publish","type":"post","link":"https:\/\/landsignal.ai\/blog\/maximum-number-storieys-triplexes-fourplexes-toronto\/","title":{"rendered":"Maximum Number of Storeys for Triplexes and Fourplexes in Toronto"},"content":{"rendered":"\t\t
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When designing a triplex or fourplex in Toronto, one of the key zoning considerations is the maximum number of storeys<\/strong> a building can have. These rules help ensure that homes remain proportional to their surroundings, preserving the character and cohesion of neighborhoods while allowing for functional, multi-unit living spaces.<\/p>\r\n\r\n

Understanding a Storey<\/h2>\r\n

As defined in Regulation 800.50(820)<\/strong>, a storey is any level of a building situated between a floor and the floor, ceiling, or roof immediately above it, basements are excluded. All floors above established grade count as storeys, while subterranean levels, such as basements defined in Regulation 800.50(80), do not contribute to the maximum storey count.\r\nExample:<\/strong> A fourplex with a basement, ground floor, and two upper floors is considered three storeys, not four.<\/p>\r\n\t\t

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Start Your Project with Confidence<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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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

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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tFree 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
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tRequest 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
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How Many Storeys Are Allowed?<\/h2>\r\n

According to Regulation 10.20.40.10(3)<\/strong> for the Residential Detached (RD) zone:\r\n\u2022 The maximum number of storeys is typically set by the \u201cST\u201d numerical value<\/strong> on the Height Overlay Map.\r\n\u2022 If a lot has no \u201cST\u201d value, there is no limit<\/strong> on the number of storeys.\r\n\u2022 Crucially, these limits do not apply to duplexes, triplexes, or fourplexes<\/strong>, giving developers and homeowners flexibility in vertical design.\r\nImportant Note<\/strong>: Any exceptions under Chapter 900<\/strong> remain in effect, but the exemption from Height Overlay Map limits ensures that multiplexes are not unnecessarily constrained.<\/p>\r\nRead Also:<\/strong> Building Length for Triplexes and Fourplexes in Toronto<\/a>\r\n

Additional Insights:<\/h3>\r\n

\u2022 Multiplexes, whether with pitched or flat roofs, are free from overlay storey restrictions.\r\n\u2022 Every floor above established grade is counted, but the overall limit on storeys does not apply to triplexes or fourplexes.<\/p>\r\n

\"Architectural<\/a><\/p>\r\n\r\n

Maximum Height \u2013 At Least 10 Metres<\/h2>\r\n

How Building Height is Measured<\/h3>\r\n

\u2022 In residential zones, the height of a building<\/strong> is measured as the vertical distance from the established grade (ground level) to the highest point of the building.<\/p>\r\n\r\n

Maximum Height in the RD Zone<\/h3>\r\n

\u2022 The permitted maximum height for a building or structure on a lot in the RD (Residential Detached) zone is:\r\n1. The height shown on the Height Overlay Map (the number in metres following the letters \u201cHT\u201d); or\r\n2. If the lot does not have a height value shown on the Height Overlay Map, the maximum height is 10.0 metres.<\/strong><\/p>\r\n\r\n

Special Rule for Duplex, Triplex, and Fourplex<\/h3>\r\n

\u2022 For these building types, the permitted maximum height is the greater of:\r\no The height shown on the Height Overlay Map; or\r\no 10.0 metres<\/strong><\/p>\r\n

\r\n\"Architectural<\/a><\/p>\r\n\r\n

Additional Main Wall Height for Multiplexes with Flat or Shallow Roofs \u2013 RD Zone<\/h2>\r\n

Regulation 10.20.40.10(4)<\/strong>\r\nMaximum Height of Main Walls (Flat or Shallow Roofs)\r\nIf a permitted residential building in the RD zone has a roof slope of less than 1 vertical unit per 10 horizontal units (i.e., <10%)<\/strong>, and this applies to more than 50% of the total roof area,<\/strong> then:\r\n(A)<\/strong> Instead of the normal limit in 10.20.40.10(2), the maximum height of all main walls is the greater of:<\/strong>\r\n\u2022 7.2 metres<\/strong> above established grade, or\r\n\u2022 2.5 metres<\/strong> less than the maximum height allowed in 10.20.40.10(1).\r\n(B)<\/strong> In addition, main walls above that height are permitted, but only if:\r\n\u2022 Any front main walls<\/strong> and rear main walls above the limit in (A) are set back at least 1.4 metres from the front and rear main walls below<\/p>\r\n \r\n

\"Isometric<\/a><\/p>\r\n\r\n

Additional Main Wall Height for Multiplexes with Flat or Shallow Roofs \u2013 R & RS Zones<\/h2>\r\n

Regulation 10.10.40.10(11)<\/strong>\r\nApplies To:<\/strong> Duplexes, triplexes, or fourplexes in the R or RS zones<\/strong> with a roof slope of less than 1 vertical unit per 10 horizontal units (i.e., <10%)<\/strong>, covering more than 50% of the total roof area.\r\nRule:<\/strong>\r\n\u2022 Despite the normal maximum wall height in Regulation 10.10.40.10(2), <\/strong>additional main walls may extend above that limit, provided:\r\no Any front main walls and rear main walls above the maximum height are set back at least 1.4 metres from the corresponding walls below<\/p>\r\n

\"Isometric<\/a><\/p>\r\n\r\n

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Why These Regulations Matter<\/h2>\r\n

Toronto\u2019s approach balances densification with neighborhood harmony<\/strong>. Exempting multiplexes from strict storey limits allows more housing units to be created without overwhelming the streetscape. It encourages thoughtful vertical development that respects the local context while making efficient use of space.<\/p>\r\n\r\n

How Land Signal Can Support Your Project<\/h2>\r\n

At Land Signal<\/strong><\/a>, we help property owners navigate the intricacies of zoning for multiplexes:\r\n\u2022 Assessing whether your lot is subject to any storey restrictions\r\n\u2022 Planning building layouts that maximize usable space while remaining compliant\r\n\u2022 Ensuring your triplex or fourplex fits seamlessly within the neighborhood context\r\nWith our guidance, you can confidently move forward with your project, optimizing both design and compliance.<\/p>\r\n\r\n

Key Takeaways<\/h2>\r\n

\u2022 A storey excludes basements and includes all floors above grade.\r\n\u2022 Triplexes and fourplexes are generally exempt from maximum storey restrictions.\r\n\u2022 Understanding these rules allows you to design multi-unit buildings that are both flexible and compliant, enhancing Toronto\u2019s residential fabric.<\/p>\t\t\t\t\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

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FAQ<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tCan I build 4 storeys?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

Generally, no. An “as-of-right” multiplex is capped at 3 storeys. Building a 4th storey would require a Minor Variance from the Committee of Adjustment, which is difficult to obtain in low-rise residential neighborhoods.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tDoes a basement count as a storey?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

No. A basement is not considered a “storey” if it is primarily below grade. This means you can have a 3-storey fourplex with a basement unit, effectively creating 4 levels of living space.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t<\/i><\/span>\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t\t\tCan I have a rooftop terrace on the 3rd floor?<\/a>\n\t\t\t\t\t<\/div>\n\t\t\t\t\t

Yes, but the floor of the terrace must not exceed the maximum building height. Railings and parapets can usually extend an additional 1.0 to 1.5 metres above the height limit for safety.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\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","protected":false},"excerpt":{"rendered":"

When designing a triplex or fourplex in Toronto, one of the key zoning considerations is the maximum number of storeys […]<\/p>\n","protected":false},"author":9,"featured_media":4019,"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":[6,15],"tags":[],"class_list":["post-3993","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-multiplex-triplex-zoning"],"_links":{"self":[{"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/posts\/3993","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=3993"}],"version-history":[{"count":0,"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/posts\/3993\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/media\/4019"}],"wp:attachment":[{"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/media?parent=3993"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/categories?post=3993"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/landsignal.ai\/blog\/wp-json\/wp\/v2\/tags?post=3993"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}