A door handle swings into the wall, a kid gets carried away, furniture catches an edge — drywall holes happen. In Canada, calling a contractor starts at $125–$200 just for the trip charge.
The good news is that drywall repair follows a fixed method by hole size, and everything short of the largest repairs is realistic DIY. This guide covers the repairs where you have to cut the wall open.
Surface damage — nail holes, scratches, tape residue — is covered separately in the rental wall repair guide. If you are preparing for a move-out inspection, start there instead.
⚠️ Before You Cut — Know What Is Behind the Wall
This is the most important warning in this article.
Canadian walls contain wiring, plumbing, and insulation. Check before a blade goes anywhere near them.
- Use a stud finder to locate framing and wiring ($20–$40 at Home Depot or Canadian Tire)
- Wiring runs vertically above and below outlets and switches. Avoid that line
- Kitchen and bathroom walls are the likeliest to carry plumbing
- Set your blade to the drywall thickness only (usually 1/2″)
Hitting wiring risks a shock; hitting a pipe multiplies the repair bill. If you are not certain, do not cut.
Tools and Materials
| Item | Purpose | Approx. cost |
|---|---|---|
| Stud finder | Locating framing and wiring | $20–$40 |
| Drywall saw | Cutting the opening | $10–$15 |
| Utility knife | Trimming | $5–$10 |
| Joint compound | Filling | $12–$20 |
| Putty knives (6″ and 10″) | Spreading and feathering | $15–$25 |
| Mesh tape / patch | Reinforcement | $5–$10 |
| Drywall offcut | Larger holes | $15–$20 |
| 1×3 lumber | Backing | $5 |
| Sandpaper (120, 220) | Sanding | $5 |
Method by Hole Size
| Size | Method |
|---|---|
| Under 1 cm | Compound only (surface repair) |
| 1–15 cm | California patch or mesh patch |
| Over 15 cm | Wood backing + replacement piece |
| Spanning a stud | Cut back to the stud and fasten |
Medium Holes — the California Patch
The cleanest method from coin-sized up to fist-sized. Also called a blowout patch.
- Square up the hole with a clean cut
- Cut a drywall offcut 5 cm larger than the opening on each side
- From the back, remove the gypsum only, leaving 5 cm of front paper all around — this becomes the “ears”
- Insert the plug and bed the paper ears in compound
- Once dry, apply two or three coats, each wider, sanding between
The paper ears act as tape, so no separate reinforcement is needed. Once you have done one, it is the fastest option.
Large Holes — Backing and a Replacement Piece
Beyond about 15 cm, the patch needs support behind it.
- Cut the hole into a clean square
- Slip 1×3 lumber longer than the opening inside, span it top and bottom, and screw it to the surrounding drywall
- Cut a drywall piece of the same thickness and screw it to the backing
- Apply mesh tape over the seams
- Build up three coats, each spread wider, sanding between
Set screws just below the surface — deep enough to dimple, not so deep they tear the paper.
Making the Repair Invisible
This part is my day job — commercial painting.
Compound applied only across the hole will always show. It leaves a low mound, and when light travels along the wall that mound casts a shadow.
The fix is feathering — thinning toward the edges over a wide area. For a large patch, spreading 60–90 cm wide is normal. Resist the urge to keep it tight.
- A 10″ knife widens the spread naturally
- Lay the knife flat to thin the material
- Wipe the final edge with a damp sponge — smooth, and no dust
- Shine a light along the wall to inspect. Straight-on inspection hides everything
If the Wall Is Textured
Canadian homes commonly have stipple, orange peel, or popcorn finishes.
- Spray texture products exist, but matching the existing pattern is difficult
- Practise on cardboard first to dial in distance and pressure
- Popcorn ceilings from before the 1980s may contain asbestos. Do not scrape or sand — get it tested
That last point is a safety issue, not a finish issue.
Matching the Paint
- Leftover original paint is always the best option
- Otherwise, take a chip from behind a switch plate to a hardware store colour matching service
- Match the sheen too — colour alone still leaves a visible patch
- If the wall has faded, painting the full wall gives a better result
When to Call a Professional
- Water stains — the cause must be fixed first
- Mould — covering it does not stop it
- Soft or spongy drywall — possible structural problem
- Anywhere wiring or plumbing runs
- Ceilings — working against gravity is a different skill
- Suspected asbestos texture
- Multiple large areas — a contractor is often cheaper at that point
Cost Comparison
| Repair | DIY | Contractor |
|---|---|---|
| A few small holes | $20–$40 | $150–$250 (incl. trip charge) |
| One or two medium holes | $40–$70 | $200–$350 |
| Large hole with replacement | $60–$100 | $300–$500 |
| Ceiling or texture | Not advised | $400–$800 |
Because the trip charge is fixed, DIY saves the most on small jobs. Conversely, if you have damage in several places, one contractor visit becomes efficient.
Frequently Asked Questions
Q. How do I know the drywall thickness? Residential walls are usually 1/2″; ceilings and fire-rated assemblies are often 5/8″. Measure a removed piece and match it.
Q. My compound keeps cracking. It was applied too thick. Thin coats, more of them. Filling a large hole without backing also cracks.
Q. Screw heads keep popping back out. Either the screw was driven through the paper, or it missed the framing. A slight dimple is correct.
Q. Can I do this in a rental? Small repairs are usually fine, but tell the landlord before cutting into a wall. A botched repair costs more to put right.
Q. How long does each coat take to dry? Four to twenty-four hours per coat, longer in humid conditions or if applied thick. Sanding early smears it.
Summary
The sequence is clear: check what is behind the wall before cutting, match the method to the size (backing is mandatory beyond 15 cm), and feather wide to finish.
And water stains, mould, suspected asbestos texture, and ceilings are not DIY jobs. Hand those four to a professional.
If all you need is surface repair, the rental wall repair guide is the better fit.
Related Reading
- BC Rental Wall Repairs Before Move-Out — Nail Holes, Scratches, Stains: Complete DIY Guide
- DIY Interior Painting in Canada — Complete Guide: Tools, Paint, Process, Costs, and Common Mistakes
- Paint Finish Types in Canada — Flat, Eggshell, Satin: A Complete Guide for Rentals and Touch-Ups
- Paint Damage in a BC Rental — What Landlords Can and Cannot Charge For (RTB Guide)