Conservation Authority Approvals in the GTA — Which One Applies to Your Property?
If your property is near a watercourse, floodplain, wetland, or other natural hazard area in the GTA, you may need conservation authority approval before a building permit can be issued. This is a separate application, a separate fee, and a separate timeline — and it cannot be deferred or skipped. Many homeowners and contractors discover this requirement after the permit application is already submitted, which adds weeks to the project.
What Is a Conservation Authority and Why Does It Affect Your Permit?
Conservation authorities are provincial bodies created under the Conservation Authorities Act to manage natural resources and reduce flood and erosion hazards within their watersheds. They regulate development near watercourses, floodplains, wetlands, valleylands, and shorelines — areas where development poses risk to natural systems or where natural systems pose risk to development.
Under Section 28 of the Conservation Authorities Act, anyone proposing to develop, construct, or place a structure within a regulated area must obtain a permit from the applicable conservation authority before a building permit can be issued by the municipality. The two applications are entirely separate — the building department cannot legally issue a permit for regulated work until the conservation authority has provided clearance.
The key word is “regulated area.” Not every property near water is in a regulated area, and not every regulated area involves water. Conservation authority mapping defines which properties require approval, and it is specific enough that one property may require approval while the adjacent property does not.
Which Conservation Authority Covers Your GTA Property?
Five conservation authorities have jurisdiction across the GTA municipalities. Understanding which one governs your property is the first step:
| Conservation Authority | Abbreviation | Primary GTA Municipalities |
|---|---|---|
| Toronto and Region Conservation Authority | TRCA | Toronto, Vaughan, Markham, Richmond Hill, Mississauga (eastern portions) |
| Credit Valley Conservation | CVC | Mississauga (western portions), Brampton (western portions) |
| Conservation Halton | CH | Oakville, Burlington, Brampton (eastern portions), Milton, Halton Hills |
| Hamilton Conservation Authority | HCA | Hamilton |
| Lake Simcoe Region Conservation Authority | LSRCA | Newmarket, Aurora, East Gwillimbury, Georgina |
Both Brampton and Mississauga are split between two conservation authorities — TRCA covers the eastern portions and CVC covers the western portions. The applicable CA depends on which watershed your specific property drains to, not which municipality you are in. This is why mapping lookup — not assumption — is the only reliable way to confirm jurisdiction.
How Do You Check If Your Property Is in a Regulated Area?
Each conservation authority maintains mapping tools that allow property owners and applicants to look up whether a specific address falls within a regulated area. These tools vary in quality and detail, but all five GTA conservation authorities provide online mapping access:
TRCA provides regulated area mapping through its website. Many municipalities within TRCA’s jurisdiction also integrate conservation authority regulated areas into their zoning maps — check the zoning schedule for your municipality as a starting point.
CVC offers a Property Inquiry Service that allows applicants to submit a property address and receive confirmation of regulated area status.
Conservation Halton maintains a regulated area viewer. Some municipalities in Halton Region integrate CH regulated areas directly into the municipal mapping portal.
Newmarket is notable for integrating LSRCA regulated areas directly into Zoning Bylaw 2010-40 schedules — making it easier to identify regulated properties during the initial zoning research step.
The safest approach is to check both the municipal zoning map and the conservation authority mapping tool independently. Municipal maps are sometimes not fully updated to reflect the most recent CA regulated area boundaries.
An amendment to the Conservation Authorities Act in April 2024 clarified that additional residential units (ARUs) proposed on regulated land require conservation authority approval — even when the existing house does not. If you are adding a secondary suite or garden suite to a property in a regulated area, a CA permit is required regardless of whether the main structure was previously reviewed.
What Does the Conservation Authority Approval Process Involve?
Conservation authority permits are entirely separate from building permits — different application, different fee, different timeline, different reviewer. Here is what to expect:
Application. Each CA has its own application form, fee schedule, and submission requirements. Applications typically require a site plan, proposed drawings, a description of the work, and in some cases an environmental impact assessment or engineering report. The level of information required depends on the nature of the hazard and the proximity of the proposed work to the regulated feature.
Fees. Conservation authority permit fees are charged in addition to municipal building permit fees. Fee schedules vary by CA and by the complexity of the application. Budget for $500 to $2,000+ for a standard residential application, with more complex applications involving flood or erosion hazard areas costing significantly more.
Timeline. Standard residential applications typically take 4 to 8 weeks for review and approval, assuming the application is complete on first submission. Applications involving significant natural hazards, environmental impact assessments, or complex engineered solutions take longer. Conservation authority review runs on a separate clock from municipal examination — they must both be completed before the building permit can be issued.
Clearance to the municipality. Once the CA approves the application, it issues a clearance letter or permit to the municipality. The building department then proceeds with its own review. Running the CA application in parallel with the building permit application — not sequentially — compresses the total project timeline.
How GTA Permits Handles Conservation Authority Requirements
Conservation authority overlap is one of the most commonly missed factors in permit planning. Discovering a CA requirement after the building permit application is submitted means starting a second application process from scratch — and waiting for it to complete before the permit can be issued.
Our process addresses this during the initial zoning and feasibility review. We check conservation authority mapping as part of every property assessment, before drawings begin. If a CA permit is required, we identify it upfront, scope the application alongside the building permit package, and initiate both applications in parallel — so the CA timeline does not add to the building permit timeline.
For location-specific information about conservation authority requirements in your municipality, see our pages for Toronto, Mississauga, Oakville, Burlington, Hamilton, and Newmarket.
Not Sure If Your Property Needs CA Approval?
We check conservation authority mapping on every property we work with — before drawings begin. One call confirms whether a CA permit is required and what it involves.
