Arborist Report Oshawa: Tree Permit Requirements & 2-Day Turnaround

Understanding Oshawa’s Tree Rules

Oshawa is one of the few Durham Region municipalities with no private tree protection bylaw for individual trees. By-law 78-2008 protects City Trees only, meaning trees with 50 percent or more of their trunk on municipal property. If you’re removing a single tree from a standard residential or commercial lot, no municipal permit applies, regardless of species or size.

“No permit” isn’t the same as “no rules ever.” Two regimes still reach into Oshawa: Durham Region’s Woodland By-law, and the City’s own development-application standards for anyone submitting a site plan, subdivision, or building permit near existing trees.

The Two Regimes That Still Apply

Durham Region Woodland By-law 30-2020

This regional bylaw covers woodlands of 1 hectare or more anywhere in Durham Region, including Oshawa. Removing or injuring trees within a qualifying woodland requires a permit from the Region, either a Good Forestry Practices Permit for work that follows accepted forestry standards or a Clear Cutting Permit for larger-scale removal. A cluster of mature trees on a large lot can meet this threshold even though it looks, at first glance, like ordinary private property.

Development-Application and Building Permit Requirements

Site plan approval, subdivision applications, and building permits tied to new construction or additions routinely require an arborist report and tree protection plan from Oshawa’s Development Services Department, even though no standalone tree-removal permit exists. This isn’t a removal permit; it’s a documentation and protection requirement that runs alongside the broader approval.

What Requires Documentation

• Woodland removal meeting Durham Region’s 1 hectare threshold under By-law 30-2020
• Any tree affected by a property going through site plan approval, subdivision, or a building permit application
• Trees on City road allowance or parkland, which fall under By-law 78-2008 and require City approval before removal

What Doesn’t

• Removing an individual tree on a standard residential lot, at any diameter, outside a qualifying woodland and outside a development application

How This Plays Out on a Real Project

Step 1: Confirm Which Regime Applies

Most single-family removals in Oshawa need nothing from us or the City. The two situations that change that: the tree sits within a Durham Region-qualifying woodland, or the property is going through a development application where site plan or building permit review requires a tree inventory.

Step 2: Woodland Documentation, If Applicable

For a qualifying woodland removal, Durham Region’s process governs. We assess the treed area against the Region’s density and area thresholds and prepare the documentation the Region’s forestry reviewers require.

Step 3: Development-Application Tree Inventory, If Applicable

For a site plan, subdivision, or building permit project, we inventory the trees affected, note which will be protected versus removed, and specify tree protection fencing. This gets folded into the broader submission reviewed by Oshawa’s Development Services Department.

Step 4: City or Region Review

There’s no standalone tree-permit review track for private trees in Oshawa. Woodland documentation is reviewed by Durham Region; development-application tree inventories are reviewed as part of the site plan or building permit process by the City.

Replacement Requirements

Oshawa has no published replacement ratio for individual private trees, because there’s no bylaw requiring one. For development applications, the City may impose a landscape-plan replanting condition on a case-by-case basis, but this isn’t a fixed formula, and we confirm the specific condition with Development Services before finalizing a project’s tree scope.

Working with The Arborist Group

Most of the value we add in Oshawa is telling clients honestly when they don’t need us: if a tree sits on a standard lot outside a development application, there’s no permit process at all. Where a Durham Region woodland or a site plan submission is actually in play, we prepare the inventory and protection documentation the Region or the City’s Development Services Department expects, so it doesn’t come back with review comments.