Why did my contractor's estimate change after starting work?

Contractor estimates commonly change during work due to unforeseen conditions discovered once walls are opened, permit requirements not initially considered, or scope creep - but in Ottawa, you have specific rights and protections under Ontario's Consumer Protection Act.

Common Reasons for Estimate Changes in Ottawa Projects

Hidden conditions are the most frequent culprit. Once your contractor opens walls or starts excavation, they may discover outdated electrical that doesn't meet current Ontario Building Code standards, plumbing that needs upgrading to pass City of Ottawa inspections, or structural issues not visible during the initial assessment. These discoveries often require additional permits and ESA or TSSA approvals.

Permit complications frequently increase costs mid-project. What seemed like a simple renovation might trigger additional City of Ottawa requirements once permits are pulled. For example, a bathroom renovation might reveal the need for upgraded ventilation to meet current OBC standards, or electrical work might require a full panel upgrade to satisfy ESA requirements.

Scope creep happens when homeowners request additional work or upgrades during the project. That "while we're at it" mentality can quickly inflate costs, especially when changes require new permits or inspections from City of Ottawa Building Code Services.

Your Rights Under Ontario Law

Ontario's Consumer Protection Act requires contractors to provide written estimates and get your approval for changes over 10% of the original contract value. If your contractor is making significant changes without proper documentation, this is a red flag.

For projects over $50, contractors must provide a written contract. Any changes should be documented in writing with new costs clearly outlined before work proceeds. You have the right to refuse additional work and stick to the original scope.

What to Watch For

Legitimate changes come with detailed explanations, photos of discovered conditions, and revised permits when needed. Your contractor should show you exactly what was found and explain why it affects the original estimate.

Red flags include vague explanations like "it's more complicated than expected," demands for large upfront payments for additional work, or pressure to approve changes immediately without time to consider.

Protecting Yourself Going Forward

Always verify your contractor's ESA license at esasafe.com and WSIB clearance at wsib.ca before starting work. Legitimate contractors will document unexpected conditions and provide clear explanations for necessary changes.

For current projects, contact City of Ottawa Building Code Services at 613-580-2424 to verify if additional permits were actually required for the discovered work. You can also check if your contractor properly pulled permits through ottawa.ca/building.

If you suspect your contractor is taking advantage, contact Ontario's consumer protection office for guidance on your rights and options for dispute resolution.