Post Construction Window Cleaning Toronto: $800 Case Study

New windows are supposed to be the easy part of a construction project. Then the trades leave, and the glass is wearing concrete splatter, installation tape, cured silicone, and a film of dust that regular window washing does not touch. This is the story of one such building in Toronto, the honest mistake we made at the start, and the method that got every pane back to clear glass.

The job: a 3-storey community centre beside two construction sites

Quick answer: DT Cleaning quoted $800 for inside-and-outside window cleaning at the Sumac Community Food Centre in Toronto, a 3-storey restored brick building with a new glass entrance. A 2-technician crew took the job in July 2026, with 2 active construction sites working directly beside the property.

The building is a good one: a heritage brick shell restored into a community food centre, with a modern glass entrance wall and metal-clad addition grafted on. New windows throughout. And right beside it, neighbouring lots wrapped in scaffolding, still under active construction.

That last detail decided almost everything about how this job went. Post-construction glass is its own discipline, and glass next to an ongoing construction site is the hardest version of it: the air itself keeps redepositing dust while you work. Two of us took the building on together, because the square footage of glazing here is far past what one technician covers in a day.

The work ran under our standard commercial coverage: $2M in Commercial General Liability insurance, full WSIB coverage, and Working at Heights certification per the Ontario Ministry of Labour standard. On a building where several exterior panes are reachable only from open steel fire-stair platforms, that training is used, not framed.

What construction left on the glass

Quick answer: The windows carried 4 kinds of construction residue: concrete splatter from masonry work, installation tape and its baked-on glue, cured silicone smears from the window install, and fine dust from the 2 sites next door. The client believed the windows had been cleaned before; the state of the glass said no real post-construction clean ever happened.

The client told us a window cleaning had been done previously. We believe them. But judging by what we found on the panes, whoever did it ran a standard wash: soap, water, squeegee, gone. That removes dirt. It does not remove what construction leaves.

Construction dust is not ordinary dirt, and it is worth treating with respect. A share of it is crystalline silica from cut concrete and masonry, a recognized workplace hazard that Canada's CCOHS documents in detail. For the glass, the practical problem is simpler: silica grit is abrasive. Rub a dry cloth across a dusty pane and you are sanding it. Everything on this job got flooded with water before anything touched the glass.

The water-fed pole mistake we admit to

Quick answer: DT Cleaning started this job the fast way: a water-fed system spraying the windows from below. On a normal building that works. Here, dust from the 2 active sites next door contaminated the rinse water, and every panel dried with streaks and residue on the frames. The crew wrote off the lost time and switched to washing everything by hand.

We will tell this one on ourselves, because it is the most useful lesson in the whole job.

Our default for a building this size is the water-fed pole: spray, agitate, rinse, let it dry spotless. It is fast, it is safe from the ground, and on a normal exterior it produces excellent results. So that is how we started here.

It was a mistake. The spray rinsed the frames well enough, but the water sheeting off the glass picked up the construction dust sitting on every surface above and around each window. Dust-loaded water does not dry clean. It dries as a faint grey film with streaks along the frames, which on brand-new black frames might as well be a signature. We looked at the first dried panels, accepted the lost time, and changed the plan.

Everything after that was manual: soap the pane, work the frames, scrub where needed, squeegee, and towel the edges dry before airborne dust could settle into the water film. Slower per window. Clean on the first dry.

How we take concrete off glass

Quick answer: Concrete splatter comes off glass with a dedicated concrete dissolver, not force: apply the product to each spot, let it work for 5 minutes, then rinse the softened material away or lift the remainder with a metal scraper held flat to wet glass. Dry scraping untreated concrete is how panes get scratched.

Concrete on glass beats most cleaning products because it is not dirt, it is bonded mineral. The wrong response is muscle. The right response is chemistry first, steel second:

1. Apply a concrete dissolver to each spot. A purpose-made acidic product that attacks the cement binder itself.
2. Wait 5 minutes. The dwell time is the work. The product softens and breaks down the splatter while you handle the next pane.
3. Rinse and wipe the softened material away. Most spots leave at this stage with nothing sharper than a cloth.
4. Scrape the survivors, wet. Whatever remains gets a metal scraper, on flooded glass, blade flat and moving in one direction. Wet, flat, and patient is the entire difference between scraping and scratching.
5. Re-soap and squeegee the pane. The final wash removes dissolver residue and leaves the glass uniform.

Tape, glue, and silicone: the steel wool stage

Quick answer: Tape residue and cured silicone come off with fine 0000-grade steel wool worked over soaped, wet glass. Used this way on standard uncoated panes, steel wool shears residue off without scratching, which is why it is an industry-standard tool for post-construction detailing. The scraper goes first for thick material, the wool finishes the surface.

Every window installer leaves a different autograph: tape corners, glue shadows, a thumb-drag of sealant near the frame bead. None of it responds to soap. Our sequence on this building was scraper first for anything with thickness, then fine steel wool over wet, soaped glass for everything that remained.

Steel wool on glass sounds wrong to most people, and the caution is fair: the wool must be fine grade, the glass must be wet and soaped, and the pane must be standard uncoated glass. Within those rules it is a precision tool that shears glue and cured silicone off the surface without marking it. Professional window cleaning suppliers teach exactly this technique for construction debris. Outside those rules, on dry glass or exotic coatings, it is how you buy a client a new window, which is also why post-construction work is a poor fit for guesswork.

This job by the numbers

Quick answer: The Sumac Community Food Centre job came to $890 total: $800 for full inside-and-outside window cleaning of the 3-storey building, plus $90 for the skylights the client added once we flagged them. A 2-technician crew, 2 complete washes of the building, and a 16-foot ladder for the tallest interior glass.

Skylights and the 16-foot ladder

Quick answer: During the walkthrough we found skylights sitting beyond easy ladder reach, and interior glazing set high in the stairwell. The client added skylight cleaning for $90. For the tall interior panes, the crew carried a 16-foot ladder through the building and worked each pane from height.

Commercial buildings hide their hardest glass on the inside. Here it was a set of skylights, plus interior panes sitting far above the stair landings. The skylights were not in the original scope; we found them, showed the client, and the client added skylight cleaning for $90 rather than leave dusty glass over a food centre's daylight.

The interior tall glass had no trick to it, just logistics: a 16-foot ladder carried through finished rooms, set, climbed, moved, repeated. Some exterior panes had their own version of this, reachable only from the steel fire-stair platforms on the addition, which is where Working at Heights habits earn their keep.

Why we washed the building twice

Quick answer: With 2 construction sites operating next door, dust kept settling on finished windows while the crew worked the rest of the building. So DT Cleaning ran a second complete pass over all the glass before handing the building back: 2 full washes for one $800 price, because the first impression of a community centre should not be someone else's dust.

This is the part of working beside active construction that no method fixes: the site does not pause because you are cleaning. Panes we finished early wore a fresh veil of dust by the time we circled back. Not thick. Visible, on new black frames and tall clear glass, at exactly the height where every visitor's eye lands.

So when the detailing was done, we went back to the start and washed the building again. All of it, top to bottom, second full pass. Same price. Some of that is pride, and some of it is arithmetic: a commercial client who opens their doors behind genuinely clean glass calls the same company next season. A client who finds streaks on opening day does not.

What post construction window cleaning costs in Toronto

Quick answer: DT Cleaning prices post construction window cleaning in Toronto by glass area, residue level, and access: most residential projects run $300 to $800, and this 3-storey commercial building came to $890 including skylights. Concrete, tape, and silicone removal are included in the quote, not billed as surprises afterward.

The quote logic is simple: we price the residue, not just the glass. A pane with concrete and silicone on it costs several times the labour of a dusty pane, and a building beside an active site may need the double-wash treatment this one got. All of that goes into the flat number up front, which is exactly how our post construction window cleaning service page describes it. For buildings on a regular maintenance rhythm instead, standard window cleaning in Toronto runs far less, because nobody is dissolving concrete.

When to book the glass clean on a construction project

Quick answer: Book post-construction window cleaning as the second-to-last trade: after painters, drywallers, masons, and window installers are fully done, but before furniture and signage go in. Cleaning glass while trades still generate dust means paying twice; on this Toronto job, 2 active sites next door forced a second full wash even with good timing.

For property managers and homeowners planning a build or renovation, the sequencing matters more than the product choice:

1. Let every dust-making trade finish first. Concrete cutting, drywall sanding, and painting all end up on the glass. Glass cleaned too early gets dirtied on someone else's schedule.
2. Remove tape questions before the crew arrives. If protective film or tape should stay on some windows, flag it. Everything else comes off.
3. Walk the building for hidden glass. Skylights, stairwell panes, transoms above doors. Finding them during the quote beats finding them from a 16-foot ladder mid-job.
4. Ask how the crew handles construction residue. If the answer is "soap and squeegee", you are buying a regular wash with a bigger invoice. Dissolvers, scrapers, and steel wool are the tell of a real post-construction service.
5. Plan for neighbouring sites. If construction continues next door, discuss a second pass up front, or schedule the final clean after the neighbours top out.

We do this walkthrough on every commercial quote, the same way we scope multi-service residential visits like our North York luxury home cleaning before a 160-guest party or the paired window-and-eavestrough day in our Mississauga French-panel case study. The building type changes; the discipline of scoping the glass before quoting it does not.

Key takeaways

Where we do this work

Post-construction and commercial window cleaning, priced the same way, across Toronto and the GTA:

Post construction window cleaning questions, answered

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