A Win in Cavan: Why Municipal Resolve and Local Knowledge Matter

Image submitted as part of the residents’ participant statement, showing the "not a barn" referenced in the property history.

Was it a drive shed, a barn, an airplane hangar, an apartment for occasional workers, or a luxury rental? And could that complicated history justify the creation of a second residential dwelling within the Oak Ridges Moraine’s Natural Core Area?

This unusual line of questioning was at the centre of a recent Ontario Land Tribunal decision that delivered an important win for the Oak Ridges Moraine.

On June 2, 2026, the OLT dismissed an appeal and refused a zoning by-law amendment that would have allowed an additional residential unit within the Natural Core Area of the ORM.

For STORM and residents across the ORM, this decision provides an important ruling on the creation of additional residential units within the ORM’s Natural Core Areas. While municipalities such as Whitchurch-Stouffville, Adjala-Tosorontio, and Uxbridge have been actively searching for opportunities to expand development permissions within some of the ORM’s most sensitive protected areas, this month’s ruling draws a clear line: additional residential units are not permitted in Natural Core Areas unless their lawful existence prior to the creation of the Oak Ridges Moraine Conservation Plan can be legally substantiated.

Additional residential units are not permitted in Natural Core Areas unless their lawful existence prior to the creation of the Oak Ridges Moraine Conservation Plan can be legally substantiated.

The Appeal

The appeal filed by the owners of 401 Elgar Drive in Cavan Monaghan revolved around a pre-existing structure that had been described as a barn or drive shed. According to the applicant’s argument, the drive shed had historically been used as an airplane hangar and had included a fridge, a stove, and several cots that were used as temporary accommodation by aircraft mechanics. On that basis, the applicant argued that the drive shed had functioned as a hangar with temporary residential accommodation and that this use existed before the establishment of the Oak Ridges Moraine Conservation Plan on November 15, 2001.

The Director of Planning for Cavan refuted the applicant’s claim. By the Director’s account, the applicant had not proven that the former drive shed had been lawfully used as either an airplane hangar or residential accommodation. The Township also argued that the conversion of the drive shed into a second detached residential dwelling had not been approved and was not permitted by either the Township’s own by-laws or the ORMCP, an argument STORM supported and agreed with.

A timeline of events, as established through submissions filed with the Ontario Land Tribunal.

The Tribunal ultimately accepted the Township’s argument. While the Tribunal acknowledged evidence that an airplane and glider had been stored in the structure at one point in time, it found that this did not establish a lawful residential use. Nor did it establish that the new residential structure was simply a continuation of a legally existing use. Instead, the Tribunal found that the proposal amounted to a second detached residential dwelling in the Natural Core Area, where such a use is not permitted under the ORMCP.

While the Tribunal acknowledged evidence that an airplane and glider had been stored in the structure at one point in time, it found that this did not establish a lawful residential use

Municipal Resolve

After the Province weakened the ability of residents and public-interest organizations like STORM to challenge municipal zoning and official plan amendments through the OLT, an important check and balance was narrowed. In many cases, where a municipality approves a questionable application, residents and NGOs now have fewer avenues to appeal. As a result, some of the most important ORMCP conformity questions only reach the Tribunal when an applicant appeals a municipal refusal.

This review cycle has made municipalities the front line of accountability in the land-use planning process.

This review cycle has made municipalities the front line of accountability in the land-use planning process.

More often than not, municipalities face pressure to settle, compromise, or back away when well-resourced applicants signal that they are prepared to appeal. Rejecting proposals by litigious applicants can be expensive, time-consuming, and politically taxing. In some circumstances, municipalities may also face the threat of cost claims. More troubling, a December 2024 performance audit of the OLT by the Ontario Auditor General found that the Tribunal often rules against municipalities, that its adversarial process can narrow the issues before it, and that public access and transparency remain serious concerns.

For that reason, it is not enough for a municipality to have a strong case on paper. It also needs competent and experienced planning staff who understand the ORMCP, a clear evidentiary record, and a municipal council willing to stand behind the planning opinion even when doing so requires time, resources, and political capital. In Cavan Monaghan, planning staff identified the conformity issues, Council refused the application, and the Township defended that decision through the appeal process.

Citizen Involvement Still Matters

While the Auditor General’s report argued that residents and community groups face significant costs and often lack the institutional knowledge required to participate effectively at the OLT, the opposite may also be true. When residents and community groups do possess the required institutional knowledge to submit a relevant and impactful participant statement, they can help support the evidentiary record and strengthen the defence of a sound municipal planning decision.

In this case, we learned two things. First, hearsay is admissible, and it is assumed that the Tribunal is capable of gauging its value. Second, local histories matter.

The applicant’s case rested on a particular version of the property’s past. The participant statements submitted by local residents helped challenge that story. They brought forward local knowledge about the property’s history, including informal statements from people familiar with the former owners, photographs of the site, and historic descriptions of the structure.

Concern must be supported by a body of evidence: dates, photographs, property history, past real estate listings and descriptions, local recollections, municipal records, and policy connections.

These residents did not simply oppose the zoning by-law amendment. They addressed the essential issues being resolved by the Tribunal and drew from a range of sources to create a body of evidence that was able to support the municipality’s decision through an alternative lens.

This is an essential lesson for residents and community groups appearing before the OLT. Concern must be supported by a body of evidence: dates, photographs, property history, past real estate listings and descriptions, local recollections, municipal records, and policy connections.

The Plan Works When Communities Uphold It

There are clear reasons why the Oak Ridges Moraine is not facing the same level of pressure as the Wellington or Oro moraines: the Oak Ridges Moraine Conservation Plan is an effective tool when and where it is upheld.

This was a win for the Township. It was a win for local residents. And it was a win for the Oak Ridges Moraine, all made possible by a community working together.