Fence height rules in Mississauga, Toronto and Oakville

You don't need a building permit for an ordinary backyard fence in Mississauga or Toronto. The rule that matters is the city's fence by-law, which caps how tall the fence can be in each part of the yard. In both cities the usual backyard limit is 2 m (about 6.5 ft), and front yards are held lower. Oakville sets its own limits, so confirm them with the Town before you settle on a design.

This guide summarizes the published rules as of October 2026. By-laws change and every lot is different, so check the official pages listed with this guide for your address before you build.

Do you need a building permit?

Usually not. Mississauga lists fences among the projects that don't need a building permit, although zoning still applies. In Toronto, fences are governed by the fence chapter of the Municipal Code (Chapter 447), which sets the height limits.

The main exception is a fence that forms part of a pool enclosure. That brings in a separate set of rules, covered below.

Height limits by city

A standard 6 ft fence is about 1.83 m tall, so it sits under a 2 m backyard limit with roughly 17 cm (under 7 in) to spare. That margin disappears quickly. A gap left under the boards, post caps or a lattice topper can all count, depending on how your by-law measures height, so plan the total height of everything you build, not just the boards.

Mississauga: open construction and driveways

Mississauga's front-yard limit depends on whether the fence is open or closed. The city treats a fence as open construction when at least one-third of it is see-through. A spaced picket or ornamental metal fence can qualify if enough of it is open. A solid privacy fence, including board-on-board, never does.

There's also a rule that catches people out. Where your backyard sits beside a neighbour's front yard, the part of your fence that comes within 4.5 m (about 15 ft) of their driveway must generally be open construction. If your lot is laid out this way, sort it out before you order a solid fence for the whole line.

Toronto: the 2.4 m strip and exemptions

Toronto caps front-yard fences at 1.2 m where they stand within 2.4 m of a lot line along a street. Rear-yard fences are generally held to 2.0 m. Lots that back or side onto multi-unit residential or commercial land can face different limits, so read Chapter 447 if that's your situation.

If you want a fence that doesn't meet the by-law, Toronto has a formal exemption process. The process includes an application, fees and a notice requirement, and approval isn't promised. Until an exemption is granted, build to the by-law.

Oakville: check with the Town

Oakville sets fence height and placement through the Town's own fence and zoning rules. Its limits aren't covered in detail here, so ask the Town to confirm the limits for your property, and whether anything about your project needs a permit, before you commit to a height or layout.

How height is measured

By-laws measure fence height from the ground, and each one defines exactly how. On a sloped lot, the height can change along the run, especially where the boards step down between posts. Check the height at the tallest points, not just in the middle of the yard.

If you're on a corner lot, call the city before you finalize the design and ask how the yard limits apply to your lot.

Pool enclosures

If a fence forms part of the barrier around a swimming pool, it's a pool enclosure, and the ordinary fence limits aren't the only rules that apply. Pool enclosure rules set their own requirements, including for height and gates.

• Mississauga: a pool enclosure needs a permit.
• Toronto: Chapter 447 has separate requirements for pool enclosures.
• Oakville: confirm the requirements with the Town.

Work out the enclosure with your pool installer, with the city's rules in hand, before the fence design is final.

Before you dig: Ontario One Call

Fence post holes go deep enough to hit buried gas, hydro, cable and other lines. Before anyone digs, ask Ontario One Call to have the buried lines on your property located and marked. The service is free. If you're hiring a contractor, ask who is making the request, and don't let digging start until the lines are marked.

Fences on the property line

A fence on the line you share with a neighbour affects both of you, so talk before you build. Agree on:

• Exactly where the fence will go
• The height and style, within the by-law limits
• Which side the finished face looks toward
• How the cost will be shared, if at all

Put the agreement in writing. If you're not sure where the property line is, a survey will tell you; an old fence isn't a reliable guide. The by-law height limits apply to a shared fence just as they do to any other.

Next steps

Once you know your height limit, our fence cost guide shows what a 6 ft board-on-board fence costs, and our fence installation page explains how we build it. We work in Mississauga, Toronto, Oakville and across the GTA. When you're ready, book a free on-site estimate and we'll go over height, layout and gates with you at your property.