How to Repair Exterior Stucco and Moulding in Toronto (2026 Guide)

Quick answer
Small stucco cracks and bird holes are fixable with $30 to $80 in materials and a Saturday afternoon. Clean the damaged area down to solid stucco, dampen the surface, apply stucco patch compound in thin layers, match the surrounding texture while wet, keep it damp for 48 to 72 hours, then paint with stucco-specific paint from the manufacturer. Anything larger than a dinner plate, above the first storey, or involving crumbling moulding is a job for a professional.

If you own a stucco home in Toronto, you already know the drill. Every spring you walk outside and find new cracks. Maybe a bird pecked a hole near the soffit. Maybe the decorative moulding around the front window is crumbling. Maybe there's a whole section that sounds hollow when you tap it.

Stucco damage is the single most common exterior issue I see on Toronto homes. After 20 years of stucco repair and painting work across the GTA, I've fixed thousands of these. Some are five-minute patches. Some are full recoating jobs. The difference between the two is usually how long the homeowner waited. Damaged EIFS lets water behind the finish coat, rots the sheathing, and creates damp conditions that attract termites and carpenter ants. A crack you ignore for two years can turn into a pest and structural problem that costs ten times more to fix.

Below: how to tell what kind of damage you have, which repairs you can handle yourself, and when to call someone.

Why does stucco crack and crumble in Toronto?

Most stucco homes in Toronto have EIFS (Exterior Insulation and Finish System), not traditional cement stucco. EIFS is a foam insulation board glued to the sheathing with a thin finish coat on top. It insulates better than cement stucco, but it's also much softer and more vulnerable to moisture problems once the finish coat cracks.

Toronto is one of the hardest cities in North America for EIFS. We get 30 to 40 freeze-thaw cycles per year between November and April. Water seeps into tiny cracks in the finish coat, gets into the foam layer, freezes overnight, expands, and breaks things apart from the inside. By spring, what was a hairline crack in October is a quarter-inch gap.

But freeze-thaw isn't the only problem.

Settling. Every house settles over time. As the foundation shifts even a few millimetres, the rigid finish coat cracks. These cracks typically appear at the corners of windows and doors, where stress concentrates. Settling cracks are normal and usually cosmetic, but they let water behind the finish coat if you leave them.

Impact damage. Baseballs, ladders, lawn mowers throwing rocks. EIFS is much softer than traditional cement stucco. A good whack dents or punctures it. Once the finish coat is broken, water gets into the foam layer and the damage spreads where you can't see it.

Age. EIFS lasts 20 to 30 years before the finish coat starts breaking down. Toronto has a lot of homes built in the 1990s and 2000s with EIFS systems that are now reaching that point. If your home was built between 1990 and 2010, check the stucco carefully this spring.

Birds. This one surprises people. Woodpeckers and starlings peck holes in EIFS because it's soft enough to get through and the hollow sound of the foam layer mimics a dead tree. Bird holes are one of the most common EIFS repairs in Toronto.

What type of stucco damage do you have?

Before you grab a bucket of patch compound, figure out what you're actually dealing with. The repair approach is different for each.

Hairline cracks (less than 1/8 inch wide)

The most common damage. Thin cracks running vertically, horizontally, or diagonally. Usually caused by normal settling or temperature cycles. These are cosmetic but they let water in over time. Easy DIY fix.

Structural cracks (wider than 1/4 inch)

Wider cracks, often near windows, doors, or at corners where additions meet the original house. These suggest ongoing movement. Filling them without addressing the cause means they'll reopen. You can patch them yourself, but if they keep coming back, get a professional to assess whether the foundation or framing is the issue.

Bird holes

Round or irregular holes, usually 1 to 3 inches across, often clustered near the roofline, soffits, or upper storeys. Woodpeckers are the main culprit in Toronto. They're after insects in the wall cavity or trying to create a nesting site. Filling the hole is the easy part. Keeping the birds from making new ones is the actual problem.

Crumbling or delaminating EIFS

Chunks falling off, surface turning powdery, large areas that sound hollow or soft when you push on them. This means moisture has gotten behind the finish coat and is breaking down the foam layer or rotting the sheathing underneath. EIFS hides moisture damage well, so by the time you see it on the surface, the problem has often been there a while. Small areas can be patched. Large ones (bigger than a few square feet) need a professional to cut out the damaged section and rebuild from the foam layer up.

Damaged decorative moulding

Window surrounds, cornices, band courses, quoins. Decorative stucco moulding cracks and crumbles faster than flat stucco because it's more exposed and harder to waterproof. Moulding repair is its own specialty. Simple patches rarely match the original profile. See our stucco moulding repair page for what's involved.

How to repair small stucco cracks yourself

Hairline cracks and small patches up to about 6 inches across are reasonable DIY projects. Here's the process I'd use on my own house.

What you need

• Stucco patch compound (pre-mixed, available at Home Depot or Lowe's for $15 to $25)
• Cold chisel and hammer
• Wire brush
• Spray bottle with water
• Putty knife or small trowel
• Sponge, brush, or texture tool to match the finish
• Exterior masonry paint (breathable, not regular house paint)
• Safety glasses

Step by step

1. Clean out the crack. Use a cold chisel to knock away any loose stucco around the crack. You want to get down to solid material. If the stucco crumbles when you tap it, keep chipping until you hit stucco that's solidly attached. Brush out dust and debris with a wire brush.

2. Undercut the edges. This is the step most DIYers skip. Use the chisel to make the crack slightly wider at the bottom than at the top. This creates a mechanical lock so the patch grips the opening instead of just sitting in it. Without undercutting, patches pop out within a year.

3. Dampen the area. Spray water into the crack and around the edges. The surrounding stucco and any exposed lath or mesh need to be damp, not soaking. Dry stucco sucks the moisture out of the patch compound before it can cure properly. This causes cracking and poor adhesion.

4. Apply the patch. Press stucco patch compound into the crack with a putty knife. Push hard to force it into every gap. For cracks deeper than a quarter inch, apply in layers. Fill halfway, let it set for a few hours, then fill the rest. Overfill slightly because the compound shrinks as it cures.

5. Match the texture. This is the hardest part. While the top layer is still wet (you have about 20 to 30 minutes), match the surrounding texture. For a smooth finish, use a damp sponge. For a sand finish, dab with a stiff brush. For a dash or rough cast finish, flick small amounts of wet patch compound from a brush. Practice on a piece of cardboard first to get the motion right.

From experience: Texture matching is what separates a patch you can see from one that disappears. I've been doing this for 20 years and it still takes concentration. On the first attempt, most homeowners end up with a patch that's obviously different from the surrounding wall. If the repair is on the front of the house where everyone can see it, consider whether a visible patch bothers you or whether you'd rather have a pro do it.

6. Cure it properly. Stucco patch needs to stay damp for 48 to 72 hours to cure fully. Mist it with water from a spray bottle two or three times a day. Cover it with damp burlap or plastic if it's in direct sun. Patches that dry out too fast crack and crumble within weeks.

7. Paint. After the patch has cured for at least a week, paint with stucco-specific paint recommended by the stucco manufacturer. Even if you use the exact same colour as your existing stucco, the patch will look different. Your original stucco has faded from years of UV and weather. A fresh patch next to faded stucco stands out. On small repairs you might get away with just painting the patch, but on anything visible you'll likely need to paint the entire wall section to get a consistent look. Do not use regular exterior house paint on stucco. Regular paint traps moisture and causes peeling and spalling within a season or two.

How to fix bird holes in stucco

Bird holes are one of the most common EIFS repairs in Toronto. Scarborough, North York, and Etobicoke have large populations of woodpeckers and starlings, and these neighbourhoods are full of EIFS homes built between 1990 and 2010.

Why birds target EIFS

Woodpeckers peck for three reasons: looking for insects in the wall cavity, creating a nesting hole, or drumming to mark territory. EIFS is a perfect target because the foam layer is soft enough for a woodpecker to get through, and the hollow sound it makes mimics a dead tree trunk. Traditional cement stucco is too hard for most birds to damage. EIFS is not.

Starlings and house sparrows exploit existing holes. Once a woodpecker starts a hole, other birds move in and make it bigger.

Filling the hole

The repair process is the same as crack repair with a few differences.

1. Wait until the nesting season is over. In Ontario, the Migratory Birds Convention Act protects active nests. If birds are nesting in the hole, you legally cannot disturb them until the young have left. Nesting season runs roughly April through August. Fill holes in September or October.

2. Clean out the hole completely. Remove all nesting material, loose finish coat, and debris. On EIFS, check whether the foam layer behind the hole is intact or damaged. If the foam is wet, soft, or missing, you need to replace that section of foam before patching the finish coat. If you find mould or moisture damage on the sheathing, that's a professional job.

3. Pack the hole. For EIFS holes up to 3 inches across where the foam is still intact, apply a base coat with fibreglass mesh pressed into it, then apply the finish coat once the base is set. For holes where foam is missing, cut a piece of matching EPS foam to fit, adhesive it in place, then apply base coat with mesh and finish coat.

4. Match the texture and let it cure. Same process as crack repair. Mist for 48 to 72 hours.

Keeping birds away

Filling the hole without addressing why the birds came in the first place just means new holes next season. Things that actually work:

• Reflective tape or hanging CDs near the damaged area. Woodpeckers avoid flashing light. This looks ugly but it works during nesting season while you wait to do the permanent repair.
• Hardware cloth or metal mesh installed over repeated problem spots. Paint it to match the stucco. It stops the birds from reaching the surface.
• Insect treatment. If the birds are after insects in the wall cavity, treat the insect problem. Remove their food source and they lose interest.
• Fake owl decoys work for about two weeks until the birds figure out it doesn't move.

How to repair crumbling stucco moulding

Decorative stucco moulding is the hardest type of stucco to repair well. Window surrounds, cornices, and band courses have shaped profiles that need to be rebuilt to match the original.

When a patch works

Small chips and cracks in moulding can be filled with stucco patch compound and shaped by hand. If the underlying profile is still intact and you're just filling a surface defect, the repair is similar to flat stucco repair. Shape the wet compound to match the surrounding profile with a putty knife or your finger.

When you need a professional

If the moulding profile is gone, broken through, or crumbling along a significant length, patching by hand won't cut it. A proper moulding repair involves:

1. Building a template (called a running mould) that matches the original profile
2. Removing the damaged section down to solid substrate
3. Rebuilding the profile in layers using the template as a guide
4. Matching the texture and paint

This is specialized work. Most general contractors and even most painters don't do moulding profiles well. We have a dedicated stucco moulding repair and painting service because it comes up often enough on Toronto's older homes that we've built the expertise and tooling for it.

Moulding repair runs $50 to $150 per linear foot depending on profile complexity. Painting the repaired moulding adds $6 to $18 per linear foot.

When to call a professional

Not every stucco repair needs a pro. But some definitely do. Here's where I'd draw the line.

DIY is fine for:

• Hairline cracks less than 1/8 inch wide
• Small patches up to about 6 inches across
• Bird holes up to 3 inches (once nesting season is over)
• Cosmetic chips on flat surfaces at ground level

Call a professional for:

• Cracks wider than 1/4 inch (may indicate structural movement)
• Damage larger than a dinner plate
• Anything above the first storey (you can't lean a ladder against EIFS without denting it)
• Soft or hollow-feeling areas over a large section (moisture behind the EIFS)
• Moulding that needs profile rebuilding
• Matching texture on a highly visible area (front of house)
• Any repair where the foam layer or sheathing is damaged

Most DIY stucco repairs hold up fine. The problem is spending a Saturday patching something that looks OK up close but obviously wrong from the sidewalk. On the side of the house nobody sees? Go for it. On the front elevation where it's the first thing visitors notice? That's where professional texture matching matters.

Stucco repair costs in Toronto (2026)

DIY costs are materials only from Home Depot, Lowe's, or a local Toronto hardware store. Professional costs include labour, materials, and texture matching.

For a detailed breakdown of full stucco painting costs by home size, see our stucco repair and painting service page.

Materials to buy for DIY stucco repair

If you're tackling a small repair yourself, here's a shopping list:

Quikrete Stucco Patch ($15-$22 for a 10 lb pail) is the easiest option for small cracks and holes. It's pre-mixed, ready to apply, and available at every Home Depot and Lowe's in Toronto. For larger patches, Quikrete Base Coat Stucco mixed from dry bags gives you more working time and a stronger bond.

Concrete bonding agent ($12-$18) improves adhesion on old stucco. Brush it on the repair area before applying the patch. Worth the extra cost on any repair bigger than a hairline crack.

Fibreglass mesh tape ($8-$12) for bridging cracks wider than 1/8 inch. Press it into the first layer of patch compound. The mesh prevents the patch from cracking along the same line.

Hardware cloth ($10-$15 for a small roll) for backing bird holes and larger patches where you need something for the compound to grip.

Stucco-specific paint. Stucco manufacturers make their own paints designed for their systems. Ask your stucco supplier what they recommend for your system. These are the right products because they're formulated to breathe and bond with the stucco material. Regular exterior house paint is designed for wood and siding, doesn't work properly on stucco, and traps moisture.

Total materials cost for a typical small repair: $30 to $80.

Get your stucco assessed

If you're not sure whether your stucco damage is cosmetic or structural, get it looked at before you start patching. A repair that covers up moisture damage or structural movement just delays the real fix and makes it more expensive when you finally deal with it.

We assess stucco damage as part of any exterior painting quote. We'll tell you what can be patched, what needs professional repair, and what's fine to leave alone. Honest assessment, no pressure to hire us for the repair if it's something you can handle yourself.

Call me directly at (416) 875-8706 or request your free quote. If I don't answer right away, I'll get back to you as soon as I can.