Pool fencing is one of those topics that most homeowners do not think about until they start planning a pool project. Then it comes up quickly, because the fence has to be in place before the pool can be filled.
The rules are straightforward, but they are strict. Ontario takes pool safety seriously, and the requirements exist to prevent accidental drownings, particularly involving young children. Understanding the rules early in the planning process helps avoid delays, extra costs, and potential bylaw issues down the road.
Who sets the pool fence rules in Ontario?
Pool fence rules in Ontario come from municipal by-laws, not the Ontario Building Code. Each town writes its own pool fence by-law, so the details change from town to town.
What the by-laws in the towns we serve have in common:
- Every in-ground pool must be enclosed. There is no exception for rural properties, large lots, or pools that are "only used by adults."
- The enclosure must be at least 1.2 to 1.53 metres (4 to 5 feet) tall, depending on the town, usually measured from the ground outside the fence.
- Gaps are limited, usually to 10 cm (4 inches) or less, and to as little as 3.8 cm (1.5 inches) in London and Ingersoll. This prevents small children from squeezing through.
- Gates must be self-closing and self-latching. Most by-laws put the latch at the top of the gate on the pool side, and some also set a minimum latch height of about 1.2 metres (4 feet).
- The enclosure must completely surround the pool so that there is no unobstructed access from outside the enclosure.
In most towns, the wall of your house can form part of the enclosure, but the rules for doors and windows that open onto the pool area vary by town, and Sarnia's by-law counts only fences and gates. Check with your local building department.
How tall does a pool fence need to be?
It depends on the town. In the towns we serve, the minimum is 1.2 metres (4 feet) in places like St. Thomas, Komoka and Strathroy, and 1.5 metres (5 feet) or more in London, Glencoe, Ingersoll, Sarnia and Grand Bend. Most by-laws measure the height from the ground on the outside of the fence.
If the ground is not level, the minimum usually has to be met at every point along the fence, so on sloped properties some sections may need to be taller than others.
A few important details about height:
- Decorative elements on top of the fence (like finials on an aluminum fence) usually do not count toward the height unless they also prevent climbing.
- Horizontal rails or features that could serve as footholds for climbing should be on the pool side of the fence, not the outside.
- Snow buildup can effectively reduce fence height in winter. This is generally not an enforcement issue since pools are closed for winter, but it is worth considering if your fence is exactly at the minimum height.
Always check your town's by-law before buying materials. Our town guides list the fence rules for each town we serve, with a link to each by-law.
What are the gate requirements?
Gates are the most important part of a pool fence because they are the weakest point in the enclosure. Most by-laws have specific requirements:
- Self-closing. The gate must close automatically from any open position. This is typically achieved with spring hinges or a hydraulic closer.
- Self-latching. The latch must engage automatically when the gate closes. No manual action should be needed to secure the gate.
- Latch placement. Most by-laws put the latch at the top of the gate on the pool side. London, Sarnia, Petrolia and Lambton Shores also set a minimum latch height of about 1.2 metres (4 feet). This keeps young children from reaching the latch.
- Gate swing direction. The gate should swing away from the pool (outward) so that it cannot be pushed open from the outside by leaning on it.
- Locks. A lock can't stop the gate from closing and latching on its own. In Ingersoll, Sarnia, Petrolia, Plympton-Wyoming and Lambton Shores, the gate must also be kept locked when no adult is supervising the pool.
The most common compliance issue we see is gates that do not close properly. Over time, spring hinges wear out, the gate sags, or something blocks the latch from engaging. Regular maintenance of the gate hardware is important.
What are the City of London's specific pool fence rules?
London sets its pool fence rules in its Swimming Pool Fence By-law (PS-5). If you are building a pool in London, here is what to know:
- A swimming pool fence permit is required before the pool goes in, even if your fence is already there. Not after the pool is in. Before.
- The permit application requires a site plan showing the pool location, fence location, gate locations, and setback distances from property lines. For an inground pool, it also needs a grading and drainage plan from a licensed professional.
- The fence must be at least 153 cm (5 feet) high, and the gate latch at least 122 cm (48 inches) above the ground.
- The pool can't be filled until the permanent fence is finished. During construction, it can be filled behind a temporary fence for up to 120 days if you notify the City by the day you fill it.
London's building department is generally responsive and can tell you exactly what they need when you apply. Your pool installer should handle the permit application as part of the project, but make sure you confirm that it is included in their scope of work. Our London pool guide has the full list of London's rules.
The surrounding municipalities we serve, including Middlesex Centre (Komoka), Strathroy-Caradoc (Strathroy), Thames Centre (Dorchester), and the City of St. Thomas, each have their own pool fence by-law, and all four accept a 1.2 metre (4 foot) fence. Our town guides cover each one.
Can your existing fence count as a pool fence?
Maybe. Many homeowners already have a fence around their backyard and wonder whether it will meet the pool fence requirements. Here is what to check:
| Requirement | Does Your Existing Fence Meet It? |
|---|---|
| Height (1.2 to 1.53 m, depending on the town) | Many yard fences are 4 feet tall, which is too short in London and the other 5 foot towns |
| Gaps within your town's limit (10 cm or less in most towns) | Picket fences and chain link usually comply; split rail does not |
| Self-closing, self-latching gates | Most yard gates are not self-closing |
| Latch at the top of the gate on the pool side, or about 1.2 m up | Most yard gates have latches on the outside at a reachable height |
| No climbable features on outside | Horizontal rails on the outside make a fence climbable |
The most common issue is height. Standard residential yard fences in Ontario are often 4 feet (1.2 metres) tall. That's enough in towns like St. Thomas, Komoka and Dorchester, but not in London, Glencoe, Ingersoll or the Lambton towns, which ask for 5 feet. There you either add a topper or replace the fence.
The second most common issue is the gate hardware. Standard gate latches and hinges almost never meet the self-closing, self-latching requirement. Upgrading the hardware is usually straightforward and much cheaper than replacing the entire fence.
What materials can you use for a pool fence?
Many by-laws don't name a material. They set performance rules (height, gap size, gate function) instead, though a few, such as Plympton-Wyoming's, list allowed materials. Any material that meets your town's rules will do.
Here are the most common pool fence materials in Ontario:
| Material | Pros | Cons | Cost Range (per linear foot) |
|---|---|---|---|
| Chain link (vinyl coated) | Affordable, durable, low maintenance | Not the most attractive option | $22 – $38.50 |
| Wood (pressure treated) | Natural look, privacy, affordable | Requires staining/sealing, can warp | $33 – $55 |
| Wood (cedar) | Beautiful, naturally rot-resistant | Higher cost, still needs maintenance | $44 – $71.50 |
| Ornamental aluminum | Clean look, maintenance-free, durable | No privacy, higher cost | $49.50 – $77 |
| Vinyl / PVC | Low maintenance, clean appearance | Can become brittle in extreme cold | $38.50 – $60.50 |
| Glass panel | Unobstructed views, modern look | Expensive, requires regular cleaning | $88 – $165+ |
The most popular choices in Southwestern Ontario are wood privacy fencing and ornamental aluminum. Wood gives you privacy and a natural look. Aluminum gives you visibility (you can see the pool from the house) and zero maintenance.
If you choose wood, make sure the design does not create footholds on the outside that would allow a child to climb the fence. A solid privacy board fence meets this requirement naturally. A fence with horizontal rails on the outside does not.
How much does a pool fence cost in Ontario?
The total cost depends on two things: the material you choose and the total length of fence you need. Most pool enclosures in the London area require 80 to 150 linear feet of fencing, depending on the lot size and layout.
| Fence Material | 100 ft of Fence (installed) | Including Gate |
|---|---|---|
| Chain link (vinyl coated) | $2,200 – $3,850 | $2,750 – $4,400 |
| Pressure-treated wood privacy | $3,300 – $5,500 | $3,850 – $6,050 |
| Cedar privacy | $4,400 – $7,150 | $4,950 – $7,700 |
| Ornamental aluminum | $4,950 – $7,700 | $5,500 – $8,250 |
| Glass panel | $8,800 – $16,500+ | $9,900 – $17,600+ |
Most pool projects in the $82,500 to $143,000 range include fencing in the $3,300 to $8,800 range. If you already have a compliant fence around your yard, you may only need to add a gate upgrade and a short section of fence to close off the pool area from the house.
When does the fence need to be installed?
In most towns, the fence must be finished, and often inspected, before the pool is filled with water. A few give you a short window: Middlesex Centre, Lucan Biddulph and Southwest Middlesex allow up to 7 days after filling, and London allows a temporary fence for up to 120 days during construction if you notify the City.
In practice, this means the fence installation needs to happen during the pool construction process, not after. Here is how it typically fits into the project timeline:
- Permit application: submitted before construction begins, includes the fence plan
- Excavation and pool installation: the pool shell goes in the ground
- Fence installation: happens while backfill, plumbing, and patio work are being completed
- Fence inspection: the municipality inspects the fence for compliance
- Pool filling: once the fence is done and, where your town requires it, inspected
Your pool company should coordinate the fence installation as part of the overall project schedule. If they do not handle fencing directly, they should coordinate with the fence contractor to make sure the timing works.
Delays in fence installation are one of the most common reasons pool projects take longer than expected. If the fence is not ready, the pool sits empty.
What happens if you do not comply?
Non-compliance with pool fence requirements can have several consequences:
- Municipal fines. Bylaw enforcement can issue fines for non-compliant pool enclosures. The amount varies by municipality but can be significant, and fines can be issued repeatedly until the issue is resolved.
- Order to comply. The municipality can issue an order requiring you to install a compliant fence within a specified time frame. If you do not comply, they can take legal action.
- Liability. If someone, particularly a child, gains access to your pool through an inadequate enclosure and is injured or drowns, you could face civil liability. The lack of a compliant fence would be a significant factor in any legal proceedings.
- Insurance issues. Your home insurance company may require proof of a compliant pool enclosure. If you do not have one and an incident occurs, your claim could be denied.
- Difficulty selling. When you sell your home, a pool without a compliant fence will show up during the home inspection. It can delay or complicate the sale.
The rules exist for a very clear reason. Drowning is a leading cause of accidental death among young children in Canada, and pool fencing is the most effective prevention measure. This is not about bureaucracy. It is about safety.
How does pool fencing affect your home insurance?
Adding a pool to your property affects your home insurance in several ways, and fencing is directly connected to this.
When you notify your insurance company that you are installing a pool (which you should do), they will ask about fencing. Most insurers want to know:
- Whether the pool is fully enclosed with a compliant fence
- Whether the gates are self-closing and self-latching
- Whether you have additional safety measures (alarms, covers, etc.)
Having a compliant fence does not necessarily reduce your premium, but not having one can increase your premium or lead to coverage exclusions. In the worst case, an insurer could refuse to cover pool-related liability if you do not meet the legal fencing requirements.
Some insurers offer discounts for additional safety features like automatic pool covers or pool alarms, but the fence is the baseline. You need it regardless of what other safety measures you have.
Can an automatic pool cover replace a fence?
In some jurisdictions in the United States, an automatic safety cover that meets ASTM safety standards can serve as a substitute for a pool fence. In Ontario, this is generally not the case.
Every pool fence by-law in the towns we serve requires a fence or other enclosure around the pool. An automatic cover is a good extra safety measure, but it does not replace the fence. Some by-laws accept a locking cover for hot tubs only.
If you are interested in using an automatic cover in place of a fence, contact your local building department directly to ask about their current policy. Rules can change, and some municipalities may have updated their bylaws since this article was written.
That said, an automatic pool cover is still a worthwhile addition even if you have a fence. It provides a physical barrier over the water surface, retains heat, reduces evaporation, and keeps debris out of the pool. It is a strong second layer of safety on top of the fence.
Frequently Asked Questions
How tall does a pool fence need to be in Ontario?
It depends on the town, because each municipality sets its own pool fence by-law. In the towns we serve, the minimum is 1.2 to 1.53 metres (4 to 5 feet), usually measured from the outside. London requires 153 cm (5 feet). Check your town's by-law before you build.
Does the pool fence need to be in place before the pool is filled?
In most towns, yes. A few allow a short window: Middlesex Centre, Lucan Biddulph and Southwest Middlesex allow up to 7 days after filling, and London allows a temporary fence for up to 120 days during construction if you notify the City. A pool without a proper enclosure is a liability and a by-law violation.
Can my existing yard fence count as a pool fence in Ontario?
It depends. Your existing fence may count if it meets your town's height requirement (1.2 to 1.53 metres), has no gaps wider than your town allows, and the gates are self-closing and self-latching. Many existing fences do not meet one or more of these requirements and need modifications or replacement.
How much does a pool fence cost in Ontario?
Pool fencing in Ontario typically costs between $3,300 and $8,800 CAD installed, depending on the material and the length of fence needed. Chain link is the most affordable option. Wood privacy fencing is mid-range. Ornamental aluminum and glass panel fencing are at the higher end.
What happens if you don't have a proper pool fence in Ontario?
Non-compliance can result in fines from your municipality, an order to remove or fence the pool, and potential liability issues if an incident occurs. Your homeowner's insurance may also be affected. In London, bylaw enforcement officers can inspect your property and issue orders to comply.
