No, and the reason isn’t laziness on the developer’s part. It’s that a handover clean is a presentation clean, timed for a walk-through, and the flat carries on shedding construction dust for a month after somebody signs a sheet saying it doesn’t.
I get called to new-builds about six weeks after completion, usually by somebody who has spent that whole time convinced the block has a dust problem and is now fairly cross about it.
The block doesn’t have a dust problem. Their flat does, and so does every other one on the floor.
What does a handover clean actually cover?
Whatever is visible from standing height on the day of the demonstration, plus the sanitaryware.
It’s typically done by a subcontracted cleaning team working through a floor of identical units at speed – somewhere between ninety minutes and three hours per flat is normal on a volume scheme. Worktops, sanitaryware, glass on the inside, floors, and a wipe of anything the buyer’s hand is likely to land on. It’s competent work under an impossible clock, and the specification comes from the developer, whose interest is a flat that looks immaculate for forty minutes while somebody is shown where the stopcock is.
What’s outside that spec: the tops of internal doors, wardrobe and kitchen unit interiors above eye level, the MVHR filters, the appliance cavities, the window channels, the underside of the shower tray lip, the tops of the skirting behind where furniture will go, and the ceiling void, which nobody can clean and which will empty itself onto your worktops over the next few weeks.
Also outside the spec, half the time: the protective film. Some schemes leave it on deliberately so the flat is protected during the buyer’s own move-in, then it becomes your job and nobody tells you.
The grout haze test
Run a dry finger diagonally across a bathroom floor tile near the wall, then look at the finger under a phone torch.
If it comes up with a fine pale powder, that’s cement or grout haze that was polished flat rather than removed, and it’s on every tiled surface in the flat including the ones that look perfect. Water makes it visible – the first time you shower, a matt bloom appears across the tray surround and people assume they’ve marked it.
It comes off with an acidic haze remover and a white pad, done in sections, and it gets meaningfully harder after about a fortnight. Do it in month one.
Why does a brand new flat keep producing dust?
Because the building is still finishing itself, and because you’re now living in a sealed box that has no way of losing anything.
Construction dust is largely gypsum, silica and MDF fibre, ground very fine by cutting and sanding, and it doesn’t settle once and stay put. It sits in the floor void, the ceiling void, the riser cupboard, the service duct behind the bath panel and the loft space where there is one. Every time somebody walks across a floating floor, every time a lift shaft moves air through the corridor, every time the flat below has a delivery, some of it comes back out.
Then there’s the block itself. On a phased development you are living inside an active site – the next core is being fitted out, the landscaping isn’t done, and the communal corridor gets tracked through daily by trades. In a flat in Woolwich I look after, the resident on the fourth floor had a grey line across her hallway carpet for eight months that corresponded exactly to the door swing, because the corridor outside was raw concrete until the scheme’s phase two finished.
The airtightness makes it worse rather than better. A Victorian conversion loses its air four or five times an hour through gaps you can’t see, which takes dust with it. A new-build at 3 m³/h/m² at 50 Pa loses almost nothing except through the ventilation system you were given, which brings us to the thing I actually came here to shout about.
The MVHR filters nobody has touched
If the flat has mechanical ventilation with heat recovery, and most new London flats built in the last decade do, there’s a unit in a cupboard or above the utility area with two filter panels in it.
Those filters have been running through the fit-out period in a lot of schemes, or been sitting in a dusty flat unwrapped. Nobody changes them at handover. They are the single most consequential thing in the flat for how it will feel to live in, and I’d guess four out of five owners I meet don’t know the unit exists, let alone that it has serviceable parts.
Find it in week one. Photograph the model number. Change the filters, don’t wash them – the pleated media doesn’t survive water. Set a reminder for six months, and every six months after.
Should you clean before you move the furniture in, or after?
Before, and give yourself a week if the completion date allows it. Almost nobody gets that week, so take whatever you can.
An empty new-build cleans in half the time and to twice the standard, because the jobs that matter are all in places furniture blocks. The wall behind where the bed goes. The bottom of the wardrobe. The strip of engineered board along the skirting. Behind the fridge cavity, which on a fitted kitchen is a sealed slot full of packaging offcuts more often than you’d believe.
Then run the heating up hard for a day and back down before anything soft comes into the flat. That first proper heating cycle drives residual moisture out of plaster and screed and moves dust out of the fabric, and it’s better it lands on a bare floor than on a new sofa. Screed in particular carries a lot of water – a liquid screed poured in autumn is still drying in spring, and it wants ventilation more than it wants a rug over it.
Off-gassing is the other reason. Fresh paint, adhesives, MDF, sealants and new carpet all release solvents, and a sealed flat concentrates the lot. Windows open a few hours daily for the first fortnight, boost on the extract, and it clears.
The protective film problem
Take it off early. All of it, including the strips on the underside of unit doors and the bit wrapped round the shower valve.
South-facing glazing bakes film onto glass within a few months and the carrier separates from the adhesive, so you get plastic off in ribbons and glue stays behind in a pattern. I spent a morning in a flat in Barking Riverside with a citrus solvent and a plastic blade on six months of baked film across a full-height living room window, and the client had assumed it was some kind of coating that came with the flat.
Never use a metal blade on new glazing without checking whether it’s coated. Low-E and self-cleaning coatings scratch, the damage is permanent, and it’s not covered.
What changes about how you clean a flat like this?
Almost everything, and the habits people bring from a period conversion actively cause problems here.
Less water, for a start. Engineered wood and click-fit LVT over screed do not want a wet mop – water goes into the joints, the board edges swell, and on a floating floor there’s nowhere for it to escape. Damp microfibre, wrung out hard, and that’s it.
Composite and quartz worktops don’t want acid. No vinegar, no limescale remover, no cream cleaner with a bleach content on quartz – it dulls the resin and the damage doesn’t reverse. Matt black taps and matt cabinet fronts, which are everywhere on new schemes now, hate anything abrasive and show every fingerprint, which is a design decision somebody made without ever having cleaned one.
Condensation is the habit change that matters most. A sealed flat with two people breathing in it produces a lot of moisture, and if the ventilation is set to trickle and the filters are blocked, it lands on the coldest surface available – usually a window reveal or the corner of a north-facing bedroom. Mould in a two-year-old flat is nearly always a ventilation issue and nearly always gets treated as a cleaning issue. Wiping it is a fortnightly job forever. Fixing the airflow is a Saturday.
The snagging point most people miss
Cleaning your flat properly in the first fortnight is the best snagging inspection you will ever do, and it’s free.
You will find the chipped worktop edge, the scratched shower screen, the door that doesn’t close on its latch, the socket faceplate that’s proud of the wall, and the grout line that was never filled – because you’ll have your face six inches from all of it. Most developers run a defect period of two years for non-structural items under NHBC-style cover, and the first months are when reporting is easiest.
Photograph as you go. Send the list in one email rather than seven.
Is any of this the developer’s problem or yours?
Split, and the line is roughly between defects and dust.
Defects are theirs – chips, scratches, misaligned doors, unsealed joints, missing grout, damaged units, anything not built or finished to standard. Report them, in writing, in the defect period, and don’t let anybody tell you a chipped worktop is wear.
Dust is yours, in practice. There’s usually no contractual standard for cleanliness at handover beyond something vague, and arguing about grout haze six weeks after completion is a fight you’ll lose slowly. Pay somebody two hundred quid, get it done properly once, and put your energy into the snag list where there’s actual money at stake.
The exception is a flat handed over with visible construction debris or an obviously skipped clean. That’s worth an email on day one with photographs attached, and it does sometimes get a team sent back.
Where I end up on most of these jobs is one full clean at four to six weeks, after the block has settled and the worst of the shedding is done, rather than on completion day when everyone wants it. I’ve had that argument with buyers in Nine Elms and in Hackney Wick and I lose it about half the time.
Check the tops of the doors. Every trade in the building has leaned a piece of timber against one.
