Ottawa Bylaws For Accessory Buildings: Sheds, Gazebos & More

If you’re planning to build a shed, gazebo, or deck in your backyard, understanding Ottawa Bylaws for accessory buildings, including sheds, gazebos, and more, is essential. These bylaws can affect whether you need a permit, how big your structure can be, and how close it can sit to your fence line. Without the correct information, homeowners may face costly fines or have to tear down non-compliant structures. 

In this blog, we’ll walk you through the regulations for sheds in Ottawa, zoning requirements, and the types of accessory buildings that are allowed. By the end, you’ll know exactly how to get started on your project legally and stress-free.

Understanding Accessory
Buildings in Ottawa

Accessory buildings are any standalone structures that are secondary to the main building on a property. In Ottawa, these can include sheds, gazebos, pergolas, workshops, and detached garages. While they may seem simple to install, they are still subject to regulation under Ottawa’s zoning bylaw and other municipal building codes.

Here are a few important things to note:

• Accessory buildings must be clearly secondary to the main dwelling.
  
  
• They can’t be used for living space (no sleeping quarters).
  
  
• You must follow Ottawa’s shed height limit rules, which typically allow a maximum of 3.2 metres for flat roofs and 4.5 metres for sloped ones.
  
  
• If you’re adding plumbing or electrical work, additional permits may be required.
  
  

Before starting any construction, ensure your structure meets the requirements of an accessory building under Ottawa’s regulations.

Do I Need a Permit for
a Shed in Ottawa?

A common question from homeowners is: Do I need a permit for a shed in Ottawa? The answer depends on several factors, including the structure’s size and features. In most cases, you do not need a shed permit in Ottawa if:

• The shed is under 10 square metres (approx. 107 sq ft).
  
  
• It is not attached to the main house.
  
  
• It does not contain plumbing or electrical systems.
  
  

However, even small sheds must still follow zoning bylaws and cannot be placed too close to property lines. If you’re unsure, it’s always safer to double-check with the City of Ottawa or consult a professional for confirmation. Larger sheds, gazebos, and deck additions usually do require a permit and inspection.

On the Blog: Shed Types & Ideas For Your Backyard in 2025

Zoning Bylaws and
Property Line Rules

Ottawa’s zoning laws are in place to make sure accessory buildings don’t block visibility, overcrowd lots, or disturb neighbours. For example, Ottawa zoning bylaw limits how close you can build to the rear and side lot lines. Some rules include:

• Sheds and gazebos must be at least 0.6 metres from the side and rear property lines.
  
  
• Structures cannot cover more than 50% of the rear yard area.
  
  
• You must also follow the building code guidelines for Ottawa to ensure safety, accessibility, and proper storm drainage.
  
  

Different rules apply depending on whether your home is in a rural, urban, or suburban zone. Backyard decks and pergolas fall under similar restrictions, so it’s a good idea to review Ottawa deck permit requirements as well if you’re building multiple structures.

Shed Size and
Design Regulations

Many homeowners want to know how big a shed they can build in Ottawa. The maximum size without a permit is 10 square metres; however, if your project exceeds this limit, you’ll need a license and possibly engineered drawings. Also consider the following:

• Keep your shed regulations Ottawa compliant by not exceeding height limits.
  
  
• Choose non-reflective roofing and siding materials if you have neighbours nearby.
  
  
• Gazebos and pergolas may be open-air, but still count toward accessory building limits.
  
  

This applies whether you’re adding a shed, gazebo, or workshop—and each must be included in your property’s total coverage ratio. These rules also apply to Ottawa backyard structures, such as pool houses and outdoor kitchens.

Understanding Ottawa’s Accessory Building Rules Made Simple

So, what are the Ottawa bylaws for accessory buildings like sheds, gazebos & more? In short, the City of Ottawa requires permits for most structures larger than 10 square metres, and all accessory buildings must follow strict zoning and setback rules. Sheds, decks, and gazebos must remain secondary to your home, respect height limits, and maintain a safe distance from property lines. Navigating these rules may seem overwhelming, but you don’t have to figure it out alone. That’s where The Assembly Experts can help you save time and ensure everything is built to code.

Outdoor Assembly In Ottawa: Why Ottawa Trusts The Assembly Experts

When it comes to building and assembling sheds, gazebos, and backyard structures, homeowners across Ottawa rely on The Assembly Experts for expert service and peace of mind. Whether you need help determining if a permit is required or want someone to handle the entire setup process for you, we’re here to make it easy. Our team is familiar with the intricacies of accessory buildings in Ottawa, and we’re ready to help bring your vision to life—legally and safely. Contact us today to get started with your next shed, gazebo, or deck project!