How to Paint a Condo Bathroom in Toronto (Moisture and Mildew)

Quick answer: painting a condo bathroom

To paint a condo bathroom that lasts, clean and kill any mildew first, prime water stains with a stain-blocking primer, then apply two coats of a moisture- and mildew-resistant paint in a satin or semi-gloss sheen. Run the exhaust fan throughout, and let the final coat cure at least 24 hours before the first shower. In Toronto, professional bathroom painting runs roughly $150 to $350.

Key Takeaways

• A bathroom is the hardest condo room to paint well, because moisture and weak ventilation work against the paint film every day.
• Kill existing mildew with a cleaner first. Painting over it just feeds it back through your fresh coat within weeks.
• Use a mildew-resistant bathroom paint in satin or semi-gloss, never flat. Shinier sheens shed moisture and wipe clean.
• Run the exhaust fan during the job and let the final coat cure 24 hours minimum before any shower steam hits it.
• A standard Toronto condo bathroom costs about $150 to $350 to paint, with hidden moisture damage being the biggest price variable.

The bathroom is the room people think will be quick because it is small. It is actually the trickiest room in the condo to paint so it stays looking good. Every shower fills it with steam, many condo bathrooms have no window, and moisture is relentless about finding any weakness in the paint. Get the prep and the product right and the finish lasts for years. Cut a corner and it peels or grows mildew within a season. For the full picture on repainting your whole unit, start with our complete condo painting guide, then come back here for the bathroom specifics.

What makes a condo bathroom different to paint?

Moisture is what makes a bathroom different, and a condo bathroom is the toughest version of the problem. Most are interior rooms with no operable window, so the only way steam leaves is through an exhaust fan. When that fan is weak, noisy, or simply never run, humidity sits in the room and soaks into the walls and ceiling after every shower.

That standing moisture is why ordinary wall paint fails in a bathroom. Flat paint absorbs it, mildew takes hold along the cool corners and the ceiling line, and the film starts to peel. The whole job is really about beating moisture: choosing a paint that sheds it, prepping so nothing is trapped underneath, and managing airflow while the paint cures. Toronto's older buildings and humid lakeside towers near Harbourfront and Humber Bay Shores make the ventilation problem even more common.

The paint and sheen to use in a bathroom

Bathrooms need a mildew-resistant bathroom-grade paint in satin or semi-gloss. There are three bathroom situations we see most often in Toronto condos, and I've got a product call for each one. The reason I'm going to be specific here is that bathrooms are where the wrong paint shows up fastest. A bedroom with the wrong paint goes ten years before anyone notices. A bathroom with the wrong paint starts peeling above the shower in eighteen months.

The sheen pattern still applies: the shinier the finish, the more moisture and scrubbing it tolerates. Satin (MPI G4) is the sweet spot for most bathroom walls. Semi-gloss (G5) is the most moisture-resistant and scrubbable common sheen; use it on trim, doors, and the wall area right around a tub or shower where splashing is constant. Flat (G1) is the wrong choice on bathroom walls. It soaks up moisture and burnishes the moment you try to wipe it down. The exception is Aura Bath & Spa, which is technically a matte but engineered specifically for wet rooms. It's the only flat-looking paint we use in a bathroom.

A note on cost: Aura Bath & Spa runs about $90 a gallon versus $70 for Regal Select. In a condo bathroom the square footage is small enough that the price difference works out to $20 or $30 total. That's nothing against the cost of repainting a windowless ensuite in three years when a cheaper paint gives up. Pay it. For sheen across the rest of the unit, see the best paint finish for a condo.

How do you paint a condo bathroom step by step?

A bathroom comes out well when you respect the prep, not when you rush the painting. The sequence below is the order we follow on every condo bathroom, and the early steps are the ones most DIYers skip and regret.

Step 1: Clean and degrease the surfaces

Bathroom walls collect soap film, hairspray, and a thin greasy haze that paint will not stick to. Wash the walls and trim with an appropriate cleaner, then rinse and let them dry. A clean surface is the foundation of a finish that bonds and lasts.

Step 2: Kill any mildew

If you see mildew, remove it before anything else. Clean the spots with a proper mildew-removing cleaner, let it work, scrub, rinse, and let the area dry completely. Do not paint over live mildew. It grows straight back through the fresh coat. For more on diagnosing it, see the mildew section below.

Step 3: Repair and caulk

Patch any holes or cracks, sand them smooth, and re-caulk gaps along the tub, counter, and trim where old caulk has shrunk or stained. Fresh caulk seals out the moisture that gets behind paint in the first place. For a full room-by-room walkthrough, see our condo painting prep checklist.

Step 4: Prime the trouble spots

Spot-prime water stains with a stain-blocking primer, and prime any bare or patched drywall so the topcoat bonds and the sheen stays even. Regular paint will not seal a water stain. It bleeds back through as a yellow-brown ring within days.

Step 5: Cut in, then roll two coats

Cut in the edges with an angled brush, then roll the walls in two coats of your mildew-resistant bathroom paint. Run the exhaust fan and keep the door open while you work. Let each coat dry for the manufacturer's recoat time before the next, and do the ceiling first if it needs paint too.

How do you deal with mould and mildew before painting?

Remove the mildew, never paint over it. Paint does not kill mildew, and a fresh coat just gives it a new surface to grow back through within weeks.

Mould vs mildew: the diagnostic that decides next steps

Surface mildew and serious mould look similar but call for different responses. The 30-second bleach test settles which you have: mix 1 part household bleach with 5 parts water and apply a small amount to an inconspicuous edge of the discolouration with a cotton swab. Wait 15 minutes.

• Stain fades or lightens visibly: surface mildew or water stain. Clean with a mildew-removing product, rinse, dry fully, and proceed with priming.
• Stain stays unchanged or shows fuzzy, irregular edges that extend beyond the visible discolouration: likely mould rather than surface mildew. Per Health Canada's mould guidance, this escalates to a remediation conversation rather than a paint conversation, especially if the affected area exceeds 1 m².

Ongoing mildew prevention

If mildew keeps returning to the same spot after cleaning, the paint is not your problem. Moisture and ventilation are. Health Canada's residential indoor air quality guidance for moisture control gives the operating envelope: keep indoor humidity below 50% (using the exhaust fan, a dehumidifier, or AC), run the exhaust fan during and for 15-20 minutes after every shower, and wipe down shower walls with a squeegee or microfibre after use to reduce standing moisture. No paint product compensates for failed ventilation indefinitely.

Watch for what is behind the mildew too. If the drywall feels soft, crumbles, or stays stained after cleaning, that is moisture damage, and it needs replacement before any paint goes on. Health Canada specifies that drywall wet more than 48 hours should be replaced, not painted over. Painting over compromised drywall just hides a problem that gets worse.

How do you fix peeling or flaking bathroom paint?

Scrape off everything loose, then prime the bare spots before you repaint, because new paint will not stick to a coat that is already letting go. Peeling and flaking are the bathroom's way of telling you moisture got under the old finish, and painting over it just buys you a few months before the fresh coat lifts in the same spots.

Start by scraping. Use a putty knife or scraper to take off all the loose and flaking paint until you reach an edge that is firmly stuck. Do not stop at the obvious flakes. Push the scraper around the edges, and anything that lifts has to come off too. Sand the transition between bare and sound paint so you cannot feel a ridge, then wipe away the dust.

Next, deal with what caused it. Peeling near the tub, shower, or window is almost always moisture finding a gap, so re-caulk failed seams and confirm the exhaust fan actually moves air. Peeling in sheets over a wide area, or paint that comes off with the drywall paper, points to a deeper moisture or adhesion problem that may need a drywall repair first.

Then prime the bare drywall or old paint edges with a quality primer so the new topcoat bonds evenly and the sheen does not go dull over the patched areas. Skipping primer on bare spots is the most common reason a freshly repaired wall peels again. Once primed and sanded smooth, two coats of mildew-resistant bathroom paint bring the surface back to uniform. If the paint is peeling because it was the wrong product for a wet room, this is the moment to switch to a proper moisture-resistant paint and a satin or semi-gloss sheen.

Why does ventilation matter so much in a condo bathroom?

Ventilation decides whether your paint job lasts, both while it cures and for years after. A windowless bathroom is the Toronto condo norm, so the exhaust fan is the only path moisture has out of the room. That makes the fan central to the whole project.

While you paint, run the exhaust fan the entire time and keep the door open with a fan moving air through the unit. This clears fumes and, just as importantly, helps the paint dry and cure properly. Trapped humidity slows the cure and is exactly what lets mildew get an early foothold in a fresh coat.

After the job, the same ventilation keeps the finish healthy. Run the exhaust fan during and after every shower so steam clears instead of settling into the walls. If the bathroom fan is weak, noisy, or never used, that is the root cause of most bathroom paint failures we see, and it is worth upgrading before you repaint rather than after the new paint fails.

What about the bathroom ceiling?

The bathroom ceiling needs as much attention as the walls, because it sits directly in the rising steam and is usually the first place mildew appears. Treat any mildew on the ceiling the same way: clean and kill it first, then prime any stains.

For the ceiling itself, a dedicated mildew-resistant matte bathroom product works well, because matte hides the roller texture and drywall seams that overhead bathroom lighting tends to expose. The key is that it must be a moisture-rated product, not an ordinary flat ceiling paint, which will grow mildew over the shower. Paint the ceiling before the walls so any spatter lands on surfaces you have not finished yet. The technique for an even, lap-mark-free ceiling is the same as any room, which we cover in our condo ceiling guide.

What does it cost to paint a condo bathroom in Toronto?

A standard condo bathroom costs about $150 to $350 to paint professionally, with the range driven mostly by size and how much moisture damage is hiding under the surface. The table below shows typical ranges. Mildew treatment, re-caulking, stain priming, and drywall repair all add to the scope.

Bathrooms are small but prep-heavy, so the cost per square foot runs higher than an open living room. The biggest variable is hidden moisture damage, which is why the most accurate price comes from a quick look at the actual room. For how bathroom pricing fits into a whole-unit repaint, see our 2026 Toronto condo cost guide.

When should you call a pro?

Call a pro when there is recurring mildew, soft or stained drywall, or a ventilation problem behind the paint failures, because those are signs of moisture issues that paint alone will not solve. A clean, sound powder room is a reasonable DIY weekend project if you use the right paint and respect the dry time. A bathroom with returning mildew, damaged drywall, or a finish that keeps peeling is a different job, where diagnosing the moisture source matters as much as the paint. If you are unsure whether your situation is DIY or pro, our guide on painting your condo yourself lays out where the line falls.

We paint Toronto and GTA condos with Benjamin Moore exclusively, treat mildew and moisture properly before a brush touches the wall, and back every job with a 5-year workmanship warranty. If your bathroom needs more than a coat of paint, get a free quote and we will take a proper look. For the bigger repainting picture, our complete condo painting walkthrough ties it all together.