Getting your tree removal permit approved is only half the job. Once the City of Ottawa signs off, you’re usually required to plant new trees to replace the one you removed, and the number depends on the tree’s size and whether the removal is connected to development. The tree replacement ratio Ottawa bylaw sets isn’t a flat rule: it can mean planting one tree, two trees, or three trees for a single removal, plus a possible cash payment if you can’t fit them all on your property. This guide breaks down exactly how the ratio works, how the City values a replacement tree, and what to do if you can’t meet the requirement.
Key Takeaways
- Most non-development removals require replanting at a 1:1 ratio, one new tree for one removed tree.
- Infill development removals require 2:1 or 3:1 replacement, depending on the removed tree’s diameter.
- The City may value the replacement using the CTLA Trunk Formula or the ratio method, whichever is greater.
- Cash compensation is available if replacement trees cannot be accommodated on-site, with a minimum value per tree.
- Replacement is usually a condition of the permit itself, not a separate optional step.
Why Ottawa Requires Tree Replacement After Removal
The replacement requirement exists because Ottawa’s urban canopy takes decades to rebuild once mature trees are lost. Rather than only regulating whether a tree can be removed, the Tree Protection By-law also sets out what has to happen afterward, so the city’s tree cover isn’t permanently reduced one approved removal at a time. This compensation requirement applies whether the tree is on private property or city-owned land.
Tree Replacement Ratios Under Ottawa’s Tree Protection By-law
The exact ratio depends on two things: whether the removal is connected to infill development, and the diameter of the tree being removed. These figures come from Schedule B of the by-law and apply once your removal has already been approved.
1:1 Ratio for Non-Development Removals
If you’re removing a distinctive tree for a reason unrelated to development, a backyard hazard, a declining tree, or a landscaping change, the standard requirement is one replacement tree for every tree removed. This is typically set as a condition of the tree removal permit itself, and the replacement is expected to go on the same property.
2:1 and 3:1 Ratios for Infill Development
When the removal is tied to an infill development, a new build, addition, or major renovation, the ratio increases. Trees between 30 and 49 cm in diameter require 2 replacement trees for every 1 removed. Trees 50 cm or larger require 3 replacement trees for every 1 removed. This is one of the reasons it pays to confirm tree requirements before finalizing plans for a construction or infill project, since the replacement obligation can affect your landscaping budget and available yard space.
| Removal Type | Tree Diameter | Replacement Ratio |
|---|---|---|
| Non-development removal | Any size (distinctive tree) | 1:1 |
| Infill development removal | 30 to 49 cm | 2:1 |
| Infill development removal | 50 cm or greater | 3:1 |
How the City Calculates Replacement Value
The ratio tells you how many trees to plant, but the City also assigns a dollar value to what was lost, and it uses whichever number is higher between two methods.
CTLA Trunk Formula vs. Replacement Ratio
The compensation value of a removed tree is determined using either the CTLA Trunk Formula method, a standard industry formula based on trunk size, species, condition, and location, or the straightforward replacement ratio, whichever produces the greater value. In practice, this means a large, healthy, well-placed tree can carry a higher compensation value than the ratio alone would suggest, even for a non-development removal.
What If You Can’t Plant the Replacement Trees On-Site?
Not every property has room for two or three new trees, especially on a smaller urban lot. If the required replacement trees cannot be reasonably accommodated on the property, the City may accept financial compensation instead. The minimum cash value is $400 per tree that cannot be planted, though the actual figure can be higher depending on the CTLA valuation of the tree that was removed. Before assuming you’ll need to pay cash, it’s worth getting a realistic sense of what planting versus paying would actually cost using our Price Calculator.
Replacement Requirements for Development & Planning Act Applications
For removals connected to a Planning Act application, such as a Site Plan or Plan of Subdivision, replacement isn’t handled tree by tree. Instead, the required number of new or replacement trees is worked into the project’s overall Landscape Plan. This usually means coordinating between whoever prepares your Tree Information Report and whoever designs your landscape plan, since a certified arborist and a landscaper handle different parts of that process. Getting both involved early avoids redesigning the plan later because the tree count didn’t match what the by-law required.
Where Replacement Trees Must Be Planted
Replacement trees are generally expected to go on the same private property where the removal took place, as a condition attached to the permit. Not every spot on a lot is suitable for a new tree though; utility lines, foundations, drainage, and mature root systems from neighbouring trees can all limit where planting will actually succeed long-term. A site walk-through or professional site assessment before planting day can save you from putting a young tree somewhere it’s unlikely to thrive.
What Happens If You Don’t Meet the Replacement Requirement
Replacement isn’t optional once it’s a condition of your permit. If the required trees aren’t planted, or the cash compensation isn’t paid, the City can treat it as non-compliance with the permit itself. That’s a different situation from removing a tree without ever getting a permit in the first place, but the two issues share the same enforcement path. If you want to understand the full range of penalties the City can apply, our guide on tree removal fines in Ottawa covers the fine ranges and what triggers them.
How to Plan for Replacement Before You Apply for a Permit
The easiest way to avoid a surprise is to factor replacement into your decision before you apply, not after your permit is approved. Confirm the tree’s diameter, whether your project counts as infill development, and how much usable planting space your property actually has. A professional tree removal and replacement plan submitted alongside your permit application tends to move through City review faster than one that treats replacement as an afterthought.
Conclusion
The tree replacement ratio in Ottawa isn’t one-size-fits-all: it depends on whether your removal is tied to development and how large the tree was. Confirming the ratio, the valuation method, and your available planting space before you apply for a permit is the simplest way to avoid a mismatched landscape plan or an unexpected compensation bill later.
FAQs: Tree Replacement Ratio in Ottawa
Do I always have to replant a tree after an approved removal?
In most cases, yes. Replacement is typically included as a condition of the permit, whether that means planting new trees, paying cash compensation, or both.
What is the replacement ratio for a non-development tree removal?
The standard requirement is 1:1, one replacement tree planted for every tree removed.
Why is the ratio higher for infill development?
Infill projects tend to remove more mature trees and place greater pressure on the remaining tree canopy, so the by-law requires 2:1 or 3:1 replacement depending on the removed tree’s diameter.
Can I pay cash instead of planting replacement trees?
Financial compensation may be accepted if the required trees genuinely cannot be accommodated on the property, with a minimum value of $400 per tree, though the City’s valuation can be higher.
Does the replacement tree have to be the same species?
The by-law doesn’t require an exact species match in every case, but species, size, and site suitability all factor into whether a proposed replacement plan will be accepted.
What happens if I skip the replacement requirement?
Failing to meet a permit condition can lead to enforcement action from the City, separate from any fine tied to removing a tree without a permit in the first place.
Still have questions about permits, fines, or pricing? Visit our full FAQ page for more.
Get Help Meeting Ottawa’s Tree Replacement Requirements
Figuring out your exact replacement obligation, and whether planting or cash compensation makes more sense for your property, is easier with a certified arborist involved from the start. We can assess your tree, confirm the applicable ratio, and help plan replacement locations that will actually establish well on your lot.
Get your free consultation or call us, available 24/7 across Ottawa.