Expanding a Livestock Operation in Ontario

When approvals are triggered, MDS implications, and what NMS/NMP requirements apply to your expansion.

When Does an Expansion Trigger Approvals?

Expanding a livestock operation in Ontario — whether you're adding animals, building a new barn, or increasing manure storage — can trigger several regulatory requirements. Understanding what triggers these requirements early in the planning process can save you significant time and money.

Common Expansion Triggers

Building a new livestock barn or expanding an existing one

Increasing the number of animals on your farm

Constructing new or expanded manure storage

Exceeding 5 nutrient units (may trigger NMS requirement)

Exceeding 300 nutrient units (may trigger NMP requirement)

Changes that increase nutrient generation on your property

Common Expansion Triggers

When you expand your livestock operation, the Minimum Distance Separation (MDS II) calculations must be reviewed. Increasing your herd size or building in a new location changes the required separation distances from neighbouring properties.

Even if your existing barn meets MDS, an expansion may change the MDS II requirement. Always recalculate MDS before proceeding with any expansion.

NMS and NMP Requirements

Most livestock expansions will require a Nutrient Management Strategy (NMS). If your operation exceeds 300 nutrient units after expansion, you will also need a Nutrient Management Plan (NMP). Both documents must be approved before construction can begin.