Mattamy is a customer-driven, for-profit business. We are pursuing GHG reduction across our operations and our industry because we believe it is the right thing to do for our customers, communities and the planet. We know that to achieve our GHG reduction goals, we must ensure they are financially sustainable.

In FY2025, we advanced and further formalized our internal carbon accounting, transitioning from a segregated process that relied entirely on inputs from our sustainability team to an integrated process that incorporates carbon accounting into our existing reporting and planning processes.

We introduced sustainability data, which include home energy modelling, tracking embodied carbon in materials, and KPIs such as cost per reduced ton and GHG emissions per sale, into our Capital Acquisition Committee process, which oversees how we purchase land for future proposed communities. This

enables us to assess our sustainability strategies for future communities before the land is acquired. For our urban business, the data are re-evaluated once the site plan is approved and when the community is opened for sale.

We have also integrated GHG emissions calculations into our five-year financial planning process to better monitor the impact of our carbon-reduction strategy and understand the associated costs of various sustainability programs. This helps us set meaningful targets for future incentive plans and assess our forecast results for compliance with our sustainability-linked revolving loan, while also providing actionable data for any new sustainability-linked financing initiatives. These data are regularly presented to the executive committee and the Board.

In Canada, carbon modelling inputs, archetype mapping, and analysis of actual and forecast GHG results against budgets and targets are the responsibility of divisional finance teams, which report to the Canadian leadership team on a monthly basis. In the United States, the corporate financial team reports to U.S. leadership based on data provided by building energy modelling software (Ekotrope and EnergyGauges). Mattamy Homes U.S. completed 3,156 HERS® (Home Energy Rating System) ratings on homes closed during the fiscal year, and the investment in Ekotrope supports the use of third-party-rated energy data in assembling financial and energy-usage forecasts.