Ontario Tree Protection Bylaws: When You Need a Permit to Build a Deck or Patio Near a Root Zone

Many GTA homeowners don’t realize that building a deck or patio near a mature tree can violate municipal tree protection bylaws. Digging post holes or altering soil inside a Tree Protection Zone can legally count as “tree injury,” leading to construction stops and fines up to $100,000. Knowing your tree’s DBH, the TPZ radius, and when a permit is required is essential before starting any outdoor project.