Former Etobicoke Zoning Code (Chapter 320): How Pre-Amalgamation Rules Affect Addition Variances

Whether your Etobicoke property falls under the former Chapter 320 zoning code or the city-wide Zoning Bylaw 569-2013 directly affects what additions you can build as-of-right. Chapter 320 was Etobicoke's pre-amalgamation zoning bylaw, and many properties remain governed by its standards even decades after the 1998 Toronto merger. The practical impact is significant: setback requirements, lot coverage limits, and height calculations can differ materially between the two codes, meaning an addition that triggers a variance under one bylaw might be fully compliant under the other. Before you spend money on architectural drawings, you need to know which rulebook applies to your lot.

Why Two Zoning Codes Still Govern Etobicoke Properties

When Toronto amalgamated in 1998, it inherited seven different municipal zoning bylaws. The city began harmonizing these into Bylaw 569-2013, but the process was gradual and remains incomplete for certain properties. In Etobicoke, the former Chapter 320 bylaw continues to apply to properties that either have not been rezoned under 569-2013 or that hold legal non-conforming status under the old code. This is not a technicality that only affects edge cases. We regularly see properties in established Etobicoke neighbourhoods like Mimico, Islington Village, and Kingsway where Chapter 320 remains the operative standard.

The distinction matters because Chapter 320 and 569-2013 define key zoning metrics differently. Rear yard setbacks, for instance, may be calculated from different reference points. Lot coverage percentages may include or exclude certain structures. Building height may be measured from different grades. These differences compound when you are designing a rear addition that pushes close to zoning limits.

How Chapter 320 Setbacks Differ from 569-2013

The most common friction point we encounter involves rear yard setback calculations. Under Bylaw 569-2013, the rear yard setback is typically measured from the rear lot line to the nearest point of the building, with specific minimums depending on your zone category. Chapter 320 used a similar concept but often with different minimum distances and different exceptions for accessory structures, covered porches, and bay windows.

Practical Example: The 7.5 Metre Question

Under 569-2013, many residential zones require a 7.5 metre rear yard setback. But a property still governed by Chapter 320 might have been zoned under a category that required only 6 metres, or that measured the setback differently. If your existing house already sits at the Chapter 320 limit, you have legal non-conforming status. An addition that maintains that existing setback line might be permissible under Chapter 320 principles, even though it would technically violate 569-2013 standards.

Conversely, we have seen cases where Chapter 320 was actually more restrictive. Some Etobicoke residential zones under the old code had coverage limits or angular plane requirements that exceeded what 569-2013 now imposes. In those situations, a homeowner might assume they need a variance when the current bylaw would actually permit their addition as-of-right.

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We had a client in Alderwood who was told by a contractor they would definitely need a variance for their rear addition. When we pulled the zoning certificate, the property was still under Chapter 320 with a smaller required setback. The addition was as-of-right under the old code. No variance, no Committee of Adjustment, no delays.

Legal Non-Conforming Status: What It Actually Means

Legal non-conforming status applies when a property was built in compliance with the zoning rules of its time but no longer meets current standards. This is extremely common in Etobicoke, where many houses were constructed under Chapter 320 and have not been modified since. The key principle is that legal non-conforming structures are grandfathered. You can maintain, repair, and often renovate them without bringing the entire property into compliance with current zoning.

However, the rules around expanding legal non-conforming structures are more nuanced. Generally, you cannot increase the extent of non-conformity. If your house sits 5 metres from the rear lot line when the current bylaw requires 7.5 metres, you typically cannot build an addition that extends even closer to the lot line. But you may be able to build an addition that maintains the existing 5 metre setback, depending on how the city interprets the applicable code.

The Zoning Examiner's Role

Toronto's zoning examiners make the determination about which code applies to your property and how legal non-conforming status affects your proposed addition. This is not an automatic process. When you submit a permit application or request a preliminary zoning review, the examiner researches your property's zoning history, reviews the applicable bylaws, and issues a determination. This determination is what governs your permit application.

We strongly recommend requesting a zoning certificate or preliminary zoning review before finalizing your addition design. This document tells you exactly which code applies, what your current setbacks and coverage are, and what the limits are for new construction. It is far better to discover you need a variance at this stage than after you have paid for full architectural drawings.

Lot Coverage Calculations Under the Two Codes

Lot coverage is the percentage of your lot that can be covered by buildings and structures. Both Chapter 320 and 569-2013 impose coverage limits, but they define what counts toward coverage differently. Under 569-2013, the definition is relatively standardized across the city. Under Chapter 320, different zone categories had different definitions, and some excluded certain structures like detached garages or covered porches from the calculation.

• Chapter 320 sometimes excluded accessory structures under a certain size from coverage calculations
• Some Chapter 320 zones measured coverage based on the main building only, not total lot coverage
• 569-2013 uses a more comprehensive coverage definition that typically includes all roofed structures
• The difference can be several percentage points, which matters significantly on smaller Etobicoke lots

For a rear addition, this distinction affects how much building footprint you have available. If your existing house and garage already put you at the Chapter 320 coverage limit, you might have no room for an addition under that code. But if 569-2013 applies and uses a different calculation, you might find you have coverage room you did not expect. The reverse is equally possible.

Height and Angular Plane Considerations

Building height is another area where Chapter 320 and 569-2013 can diverge. The city-wide bylaw measures height from established grade to the highest point of the building, with specific definitions for how grade is calculated. Chapter 320 used similar concepts but with different reference points and different maximum heights for various zone categories.

Angular plane requirements, which limit how tall a building can be relative to its distance from lot lines, also varied between the codes. These requirements are particularly relevant for two-storey rear additions, where the combination of height and setback determines whether you can build the full second storey or need to step back the upper floor.

The Sloping Lot Complication

Etobicoke has significant topographic variation, particularly in areas near the Humber River and Lake Ontario. On sloping lots, height calculations become more complex because grade is not uniform across the property. Chapter 320 and 569-2013 handle this differently, and the difference can mean several feet of additional building height or a requirement to step down the rear addition to comply with angular plane limits.

When Chapter 320 Status Helps Your Addition

There are specific situations where operating under Chapter 320 works in your favour. The most common is when your existing house was built to Chapter 320 setback minimums that are smaller than what 569-2013 now requires. In this scenario, maintaining your existing building line for a rear addition may be permissible as a continuation of legal non-conforming status, whereas a strict application of 569-2013 would require a variance.

Another favourable scenario involves lot coverage. If Chapter 320 excluded your detached garage from coverage calculations but 569-2013 includes it, you might have more buildable area under the old code. Similarly, if Chapter 320 allowed certain projections like bay windows or covered entries without counting them toward coverage, your effective building envelope may be larger.

At PermitsHub, we have helped numerous Etobicoke homeowners navigate these Chapter 320 advantages. Our familiarity with both codes allows us to identify situations where the former bylaw provides more flexibility, potentially saving clients the time and expense of a Committee of Adjustment application.

When Chapter 320 Status Complicates Your Addition

Chapter 320 is not always the more permissive code. Some Etobicoke zones under the old bylaw had restrictions that exceeded current city-wide standards. We have encountered properties where Chapter 320 imposed stricter angular plane requirements, lower height limits, or more restrictive coverage calculations than 569-2013 would.

The complication arises when you want to argue for application of 569-2013 instead. Generally, you cannot cherry-pick the more favourable provisions from each code. The zoning examiner determines which bylaw applies to your property, and that determination governs your entire application. If your property is under Chapter 320, you are bound by its restrictions even when 569-2013 would be more permissive.

• Some Chapter 320 zones had maximum lot coverage of 30 percent when 569-2013 allows 35 percent
• Certain residential categories under Chapter 320 required larger side yard setbacks
• Angular plane requirements in some Chapter 320 zones were more restrictive near lot lines
• Accessory structure regulations sometimes limited garage or shed placement more severely

The Variance Path When Codes Conflict

If your proposed addition does not comply with the applicable code, whether Chapter 320 or 569-2013, you will need a minor variance from the Committee of Adjustment. The variance process is the same regardless of which bylaw applies, but the specific relief you are requesting will reference the operative code.

Understanding which code applies is essential for preparing a strong variance application. The four tests for a minor variance, including whether the variance is minor and whether it is desirable for appropriate development, must be argued in the context of the specific bylaw standards you are seeking relief from. A variance application that misidentifies the applicable code will face immediate challenges.

We also see situations where the zoning complexity itself becomes an argument in favour of the variance. If your property sits in a grey area between codes, or if the application of Chapter 320 produces an outcome that seems inconsistent with the neighbourhood character, these factors can support your case before the Committee.

Getting Clarity Before You Design

The single most important step for any Etobicoke homeowner planning a rear addition is obtaining zoning clarity before committing to a design. Request a zoning certificate from the city, which will identify the applicable bylaw, your current zoning designation, and the specific standards that apply to your lot. This document costs relatively little and can save significant money by preventing designs that do not comply with the operative code.

When working with PermitsHub on Etobicoke rear additions, we conduct our own preliminary zoning analysis as part of the design process. We research your property's zoning history, identify whether Chapter 320 or 569-2013 applies, and flag any legal non-conforming conditions that affect your addition options. This analysis informs the design from the start, ensuring the drawings we produce are aligned with the actual rules governing your property.

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The worst outcome is designing a beautiful addition, paying for full permit drawings, and then discovering at submission that you are under Chapter 320 with different setback requirements. Now you are redesigning, redrawing, and paying twice. Ten minutes of zoning research at the start prevents that entirely.

If you are unsure which code applies to your Etobicoke property or how pre-amalgamation zoning affects your addition plans, a free PermitsHub review can provide clarity. We will identify the applicable bylaw, flag any variance triggers, and give you realistic expectations for what you can build as-of-right versus what requires Committee of Adjustment approval.