I hear it on about half the calls I take, usually in a slightly apologetic tone, as though tidiness might disqualify someone from hiring a cleaner. What people mean is that they suspect weekly is more than they need and they’d like permission to book fortnightly. Fine. Here’s what shifts between the two, in a two-bed flat, no pets, and where the difference is smaller than the price gap suggests.
What Changes in the Second Week, and What Doesn’t?
Dust behaves predictably. It falls at a fairly steady rate, and a fortnight of it on a shelf is two weeks of it on a shelf. Nothing has changed except quantity, and quantity is easy. A cloth removes fourteen days of dust in the same stroke it removes seven.
Everything wet behaves differently. Soap residue and hard water on a shower screen don’t accumulate, they bond. Day three is a film you can wipe with water. Day eleven is a mineral-bound layer that needs an acid and a blade. The same is true of the hob. Splashed fat, reheated forty times over two weeks, polymerises into something closer to varnish than to grease.
That’s the whole answer, and everything below is detail. Dry dirt is linear. Wet dirt isn’t.
The Bits That Cross Over
A few things sit awkwardly in the middle. The kitchen bin area, where liquid gets under the bin and starts smelling on about day nine. The toilet, under the rim, where a fortnight of hard water builds visible scale you can’t shift with the brush. The fridge, if anybody in the flat cooks with anything that spits.
Those are the parts of a home that decide whether a fortnightly service feels adequate or slightly grim, and they’re all in two rooms.
Does a Fortnightly Clean Take Twice as Long?
No, and this is where people miscalculate the savings.
A weekly maintenance clean in a two-bed of around 700 square feet takes two and a half hours once the cleaner knows the flat. The same flat on a fortnightly rota needs three and a quarter, sometimes three and a half. You’re paying for five weekly hours a month against roughly six and a half fortnightly hours across the same month, which sounds like a clear saving until you notice you’re getting half the visits.
At £20 an hour that’s £216 a month weekly against £141 fortnightly across a four-week cycle. Real money. I’m not pretending otherwise.
The other half of the arithmetic is what the household absorbs. On a weekly rota nobody in the flat does anything between visits and the system holds. On a fortnightly one, somebody wipes the hob on day eight or the cleaner spends her first half hour on it, and there is no third option. Households that go fortnightly and change nothing about their own habits are the ones who ring at month three to say the service has got worse. It hasn’t. The gap has.
Why the First Forty Minutes Disappear
On a fortnightly visit, the opening stretch goes on recovery rather than maintenance. Descaling the shower screen properly, working the hob back to a clean surface, dealing with whatever has gone on under the bin. None of that would exist on a weekly rota, because none of it would have had time to set.
So the extra forty-five minutes on a fortnightly booking buys you no additional cleaning. It’s the same work done the hard way. That’s a fortnight problem, and it’s structural rather than a failure of anybody’s effort.
Which Rooms Suffer, and Which Don’t Notice?
Bedrooms don’t notice. In a flat with no pets and shoes coming off at the door, a bedroom cleaned every fourteen days looks and smells the same as one cleaned every seven. Same for a living room without a dog on the sofa. Dust, a hoover, done.
The bathroom notices. London water hardness runs somewhere between 250 and 350 mg per litre of calcium carbonate, depending on your supply zone, against the 200 mark that the World Health Organization treats as the general threshold for hard water. Thames Water’s average sits around 300. Chalk aquifers under the Chilterns and the North Downs put it there and nothing you do in your flat changes it.
What that means practically: every time the shower runs, evaporation leaves calcium carbonate on the glass, bonded into whatever soap and skin oil is already there. Seven days of that comes off with a cream cleaner. Fourteen days of it, in a bathroom with poor extraction, needs a proper descaler dwelling for ten minutes and then a scraper on the worst of it. Leave it for a month and the glass starts to etch, permanently, and no cleaner on earth will get it back. That etching is the strongest argument for weekly I know of, and it applies to perhaps one flat in five, because it depends on whether your screen is toughened glass with a factory coating still intact or a ten-year-old panel that lost its coating in 2019.
Run your hand across it dry. A screen in good condition sheds water in sheets and feels slick. One that’s lost its coating holds droplets in rings and feels faintly rough, and that flat needs the shorter cycle whatever else is true about it.
The kitchen notices too, though less dramatically, and the extractor filter is the thing everybody forgets at either frequency.
Grease is the other fortnight problem, and it’s the one people underestimate because it doesn’t look like anything for the first week. Fat vapour from frying settles on every surface above waist height in a small London kitchen, thin enough to be invisible, sticky enough to catch dust. At seven days it comes off with hot water and detergent. At fourteen it needs a degreaser and two passes, and on the underside of a wall cupboard it will have started attracting a grey bloom that people mistake for mould.
The Shower Screen Is the Real Decision
If your bathroom has a glass screen and a window that doesn’t open, weekly earns its money there and nowhere else. If you’ve got a working extractor fan, or one of those flats where somebody squeegees the glass out of habit, the fortnightly gap closes almost entirely.
I’d go and look at your shower screen at day eleven before deciding anything else. Run a fingernail across it near the bottom corner. If it catches, that’s a fortnight problem in your flat specifically, and it’s worth £75 a month to you. If it squeaks, it isn’t.
Who Should Book Weekly Regardless?
Occupancy beats frequency every time, and a two-bed with no pets covers a wide range of lives.
Two people out of the flat from eight until seven, eating out three nights a week, no children, no smoking: fortnightly, comfortably. Two people working from home full time, cooking twice a day, with a fabric sofa that gets sat on for eleven hours: weekly, and you’ll still feel it by day six. Same flat, same square footage, completely different job.
Add a child and the answer changes before you finish the sentence. Add somebody with a dust mite allergy and it changes on medical grounds, since mattress and soft furnishing management works on a shorter cycle than anything I’ve described. Add a household that entertains most weekends and you’re paying for Sunday mornings rather than for hygiene, which is a legitimate thing to buy.
Smoking indoors moves everybody to weekly and it isn’t close. Tar deposits on walls, glass and ceilings on a schedule that makes hard water look gentle, and a fortnightly rota in a smoking flat means the cleaner is always fourteen days behind and never once ahead.
The Thing People Are Buying Without Saying So
Plenty of weekly bookings in London aren’t about dirt. They’re about the pre-clean tidy, the twenty minutes on Tuesday night when everybody puts things away because somebody’s coming. That’s a household management tool wearing a cleaning company’s uniform, and it works.
I’ve no problem with it. I’d only ask people to know that’s what they’re buying, because if it is, weekly is the right answer and the hard water argument above is beside the point.
What Would I Book for a Flat Like That?
Fortnightly, and I’d have said so on the phone.
Two working adults, no pets, no kids, two bedrooms, one bathroom, shoes off at the door. That flat does not need somebody in it every seven days, and the marginal benefit of the extra visit is a shower screen and a hob. I’d rather sell you twenty-four visits a year you value than fifty-two where the cleaner arrives, finds nothing to do, gets bored and leaves for a client who needs her. That happens more than the industry admits and it’s how good people leave the trade.
A couple in Ivydale Road in Nunhead had me weekly for eleven months in 2021 and I moved them to fortnightly myself after the fourth or fifth visit where I was hoovering a carpet that didn’t need hoovering. They’re still with me. That’s five years of a smaller invoice, and I’d make the same call again.
The Middle Option Nobody Offers
Book fortnightly, then take the bathroom yourself on the off week. Ten minutes. Descaler on the screen and the taps, leave it while you do something else, rinse, squeegee. That single job is most of what a weekly visit buys you in a flat like this, and it costs you a Wednesday evening rather than £900 a year.
Then put a proper deep clean in the diary twice a year for the oven, the extractor filter, the window interiors, the skirtings and behind the appliances. Fortnightly plus two deep cleans beats weekly for most two-bed households in London, costs less, and gets to the parts a maintenance visit never reaches at either frequency.
The couple in Nunhead have theirs in April and October. She books it the same week she puts the clocks forward, and the reminder in her phone still says “ring the cleaning man” even though we’ve been emailing since 2022.
