Exterior workmanship failures are particularly frustrating because they often don’t reveal themselves immediately. Siding that was installed without proper flashing may not show water infiltration until the second rainy season. Eavestroughs installed with insufficient slope may overflow for a year before the fascia behind them begins to rot. By the time the problem is obvious, the contractor may have moved on — or closed up entirely.

Here’s what to do when you discover exterior work has been done incorrectly.

“The first question I ask homeowners who call me about a failed exterior is whether they have anything in writing — the original quote, the invoice, a warranty document. Without those, every subsequent step is harder. Document what you have now, hire an independent inspector to assess the failure, and contact the contractor in writing before you do anything else.”

— Alex @ Ace Roofing Inc., licensed exterior contractor with 18 years of experience in residential siding, soffit, roofing, and eavestrough installation in the local area

Step 1: Document Everything Before Any Repair Is Made

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What to Do If an Exterior Contractor Does Bad Work 1

Before you call the contractor, before you call your insurer, before any repair work is done:

  • Photograph and video the problem in detail — water staining, buckling panels, sagging eavestroughs, visible rot at fascia, moisture at window openings
  • Check the attic if you have access and look for any signs of moisture infiltration
  • Note the date you discovered the issue and what conditions (a rain event, a temperature swing) preceded it
  • Gather all documents — the original quote, invoice, contract, and any written warranty

This documentation is what makes every subsequent step possible.

Step 2: Contact the Contractor in Writing

Notify the contractor about the problem by email or in writing. Describe:

  • What the problem is and when you discovered it
  • What damage has resulted
  • Your expectation that the issue is covered under their workmanship warranty

Keep a record of all responses. Give the contractor a reasonable time to respond — 5–10 business days — before escalating.

Step 3: Get an Independent Assessment

If the failure is significant or the contractor disputes responsibility, hire an independent home inspector or exterior cladding consultant to assess the installation. Their written report documents the issue objectively and identifies the likely cause — workmanship, product failure, or something else. This report is the foundation of any warranty claim, insurance claim, or legal action.

An independent assessment typically costs $300–$600 and is money well spent on a project that may have cost $20,000–$40,000.

Step 4: File a Complaint with the Relevant Authority

If the contractor is registered with the relevant trade licensing body, the Canadian Home Builders’ Association, or another professional body, file a formal complaint. These bodies can investigate, require remediation, and in serious cases, revoke membership or registration.

Also consider filing with:

Step 5: Home Insurance Claim for Resulting Damage

If the exterior failure has caused interior water damage — damaged drywall, insulation, flooring — your home insurance policy may cover the interior damage even if the dispute about the exterior repair is unresolved. Contact your insurer, describe the situation, and ask about coverage for the resulting damage.

Step 6: Small Claims Court for Unresolved Disputes

If the contractor refuses to remedy the work and other avenues haven’t resolved the situation, small claims court is an option for disputes within the regional limit (up to $35,000 in many regions as of 2026).

You’ll need: the original contract, the independent inspection report, photographic evidence, and records of all communications.

How to Protect Yourself Next Time

The exterior failures that end in disputes almost always had identifiable warning signs at the quoting stage — vague materials specifications, absent house wrap or flashing from the scope, reluctance to provide insurance documentation. The best protection is asking the right questions before signing.

See: Questions to Ask an Exterior Contractor Before You Hire One

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