Drywall failures often become visible only after painting — when seams appear through the paint, tape edges catch the light, or corners crack. By then the contractor has typically been paid. Here’s what to do when you discover the finishing wasn’t done to the agreed standard.

“The most useful thing a homeowner can do when they discover drywall problems after painting is document them in raking light. Take photos with your phone’s flashlight held close to the wall surface at a low angle — that captures the imperfections that are impossible to see in a normal photo but obvious in person. That documentation is what makes the warranty conversation productive.”

— Declan Walsh, drywall finishing specialist and construction quality consultant with 20 years of experience in residential and commercial finishing across the Toronto region

Step 1: Document the Problems in Raking Light

Interior view of a home under renovation with exposed wooden beams and door.

Drywall finish problems are most visible — and most photographable — in raking light: a light source held close to the wall surface at a shallow angle. Use your phone’s flashlight or a handheld work light to photograph:

  • Visible tape edges or seams under paint
  • Ridges or hollows at fastener locations
  • Trowel marks or tool texture in skim-coated areas
  • Cracking at joints or corners
  • Texture inconsistencies in repaired areas

Photograph both the problem areas and wider context shots showing where they are in the room. This documentation is the foundation of your warranty claim.

Step 2: Review Your Contract and Warranty

Close-up of drywall sheets stacked in a large warehouse in London.

Pull out the original contract. What finish level was specified? What warranty was offered? What does the warranty cover and exclude?

If the finished surface shows visible seams and the contract specified Level 5, you have a clear basis for a warranty claim. If no finish level was specified, the situation is less clear — but “not fit for purpose” is still a basis for complaint under consumer protection legislation.

Step 3: Contact the Contractor in Writing

Notify the contractor by email, including:

  • A description of the specific problems (visible tape at joints in the living room, cracking at inside corners throughout the basement, etc.)
  • When you first noticed them
  • Your belief that the finish doesn’t meet the agreed specification or reasonable workmanship standard
  • Your request for an inspection and remediation

Give the contractor 5–10 business days to respond.

Step 4: Get an Independent Assessment for Significant Failures

For significant finishing failures — visible seams throughout a room, texture mismatches across a repair, wholesale finish inconsistency — an independent assessment by a drywall professional confirms the cause and the appropriate remedy. This is particularly useful if the contractor disputes that the work is substandard.

A second drywall contractor or a building inspector can assess whether the finish meets the specified level and identify specific areas of non-compliance.

Step 5: Understand the Remediation

Drywall finish problems are fixable — but the fix often involves more work than the original installation. A seam that’s visible through paint typically requires:

  1. Sanding the affected area
  2. Applying additional compound and feathering it out
  3. Repriming
  4. Repainting

For significant failures, this remediation may involve sanding walls back to compound, applying a full skim coat, repriming, and repainting. The cost of this remediation is the basis for your warranty claim or legal action if the contractor refuses to perform it.

Step 6: File a Complaint

Your local consumer protection office (consumerprotectionontario.Ca): For unfair business practices or failure to honor warranty obligations.

Better Business Bureau: Creates a public complaint record.

Step 7: Small Claims Court

For unresolved financial disputes within the regional limit (up to $35,000 in many regions), small claims court is an option. You’ll need: the original contract, the warranty document, your documentation of the failures, an independent assessment, and the cost to have the work remediated by another contractor.

Prevention

Every drywall failure that results in a dispute was preceded by a conversation that didn’t happen — the finish level wasn’t specified, the number of coats wasn’t confirmed, the contractor’s timeline didn’t allow for proper drying. These are the questions that protect you before the job starts.

See: Questions to Ask a Drywall or Plastering Contractor Before You Hire One

Related Questions

Have a question we didn’t cover? Submit it below.

Was this question list helpful?

by WikiQuestions