The work is signed off, the trades have packed up, and the space is unusable. There is a gray film on every horizontal surface, adhesive residue on the window glass, paint speckle on the new hardware, and sticker glue on the appliances. Someone wipes it all down. The next morning, the film is back.
That last part is the whole reason post-construction cleaning is a separate trade from house cleaning, and the reason a cheap single-visit quote is usually a quote for a job that will not be finished.
Why the dust comes back
Drywall dust is extremely fine and extremely light. Fine enough that a significant quantity stays suspended in the air for hours after the sanding stops, and light enough that normal air movement keeps it circulating.
Whatever is still airborne when a cleaning crew finishes will land on the surfaces they just wiped. It is not a quality failure, and it is not someone cutting corners. It is physics, and the only reliable answer is to plan for multiple passes with settling time between them.
A contractor who has handed over a few renovations already knows this. A homeowner living through their first one usually does not, and finds out the morning after they paid for a clean.
There is a second reason the trade is different: construction dust is abrasive. Drywall dust and concrete dust carry silica particles. Dragging a cloth across a newly finished surface with abrasive dust on it is how you put fine scratches into new hardwood, new glass and new stainless steel. The dust has to be lifted — vacuumed with a HEPA-rated filter, or taken off with a damp microfibre that is rinsed constantly — before anything is wiped.
The three phases
Most projects run through some version of these. Which ones you need depends on the scope of work and on what the trades removed themselves.
Phase one: rough clean
Happens once the main construction is finished but before the final finishes go in, or immediately after the trades leave on a smaller job.
- Remaining debris, offcuts and packaging removed to the container
- Nails, screws and fixings collected
- Heavy dust pulled off floors, ledges and sills
- Protective coverings, masking and plastic removed
- Manufacturer stickers and labels off windows, fixtures and appliances
- The space made safe and accessible for the detail pass
This phase is about volume, not finish. It exists so the detailed work has something to work on.
Phase two: detail clean, top down
The substance of the job, and always worked from ceiling to floor, because anything disturbed above falls onto what is below.
- Ceilings, light fixtures and fan blades
- HVAC vents, registers and return covers — these hold a surprising amount
- Walls wiped where the paint finish allows it
- Door frames, door tops, trim and casings
- Baseboards hand-wiped along their full length
- Window frames, sills and tracks: vacuumed first, then wiped
- Electrical plates, outlets and switch surrounds
- Cabinetry inside and out, including the tops and toe kicks
- Shelving, closets and built-in storage
- Paint speckle, compound and adhesive residue removed from glass and hardware
- Interior glass, both faces, including frames
- Fixtures, faucets and hardware polished
- Grout haze removed from new tile
- Floors cleaned according to their finish
Phase three: touch-up before handover
A return visit, typically 24 to 48 hours later, once the airborne dust has finished settling.
- All horizontal surfaces re-wiped
- Glass and mirrors checked and re-cleaned
- Floors re-cleaned
- Final walkthrough with you or your site contact
This is the pass that makes the difference, and it is the one most often cut from a quote to make the number look better. A space cleaned once looks wrong on handover day. A space cleaned twice, with settling time between, does not.
Finishes need different handling
New surfaces are at their most vulnerable in their first weeks, and the method that is correct for an established surface can damage a new one.
- Newly finished hardwood is still curing. Excess water and many standard floor cleaners will mark or cloud a fresh finish.
- Unsealed grout absorbs whatever is used on it. Clean it before it is sealed, and use nothing that will stain.
- New vinyl and LVT can be scuffed by aggressive pads, and some adhesive removers soften the material.
- Polished concrete needs a pH-neutral cleaner; anything acidic will etch it.
- Natural stone — marble, limestone, travertine — is etched by acidic cleaners, including some household descalers.
This is worth asking any cleaning company about directly. If they cannot tell you how they will treat your specific floor finish, they are going to find out on your floor.
How it differs from a deep clean
They sound similar and they are not.
A deep clean addresses household soil: grease, organic residue, accumulated dust, limescale. The surfaces are established and tolerant.
Post-construction work addresses abrasive silica dust, adhesive, grout haze, sealant residue and paint speckle, on surfaces that are new, sometimes still curing, and expensive to damage. The sequencing is different, the materials are different, and the risk profile is completely different.
If someone quotes your post-construction handover at deep-clean rates and deep-clean duration, they have not understood the job.
Scheduling it properly
Work backwards from the handover date, not forwards from completion.
- The rough clean can happen while some trades are still on site.
- The detail pass should wait until the last trade has finished. Any trade still working will put dust back onto finished surfaces, which wastes the pass you just paid for.
- The touch-up should land the day before handover or client walkthrough.
And a quote for this work given over the phone is a guess. The variable is the condition the trades actually left, which nobody can assess remotely. Any company serious about post-construction work will want to see the space.
In short
Post-construction cleaning is three passes, not one; it works top down; it lifts abrasive dust rather than wiping it; and it treats new finishes differently from established ones. The touch-up visit is the part that makes the handover hold.
If you have a project coming up for completion, tell us the handover date and we will plan the passes backwards from it.
