Drying Laundry in a London Flat: How to Do It Without Causing Mould

The London Laundry Struggle is Real

If you live in London, you know the drill. It’s Tuesday evening, raining (again), and you have a basket full of wet work shirts. You don’t have a tumble dryer because your kitchen is the size of a cupboard. You don’t have a garden, and your “balcony” is standing room only.

So, you hang the clothes inside. By Thursday, the clothes smell slightly like wet dog, and by Friday, you notice water droplets running down the windows. Fast forward two months, and there are black spots appearing behind the wardrobe.

We see this every single week. At Mould Removal Specialists, about 40% of the call-outs we attend in winter are caused specifically by drying laundry incorrectly.

Living in a Victorian conversion in Islington or a modern build in Stratford presents different challenges, but the result is the same: moisture has nowhere to go.

Where Does the Water Go?

Let’s talk numbers for a second. A typical load of washing contains about 2 litres of water when it comes out of the machine. That’s a large bottle of Coke worth of liquid.

When that water evaporates from your socks and towels, it doesn’t disappear. It turns into vapour. It hangs in the air, looking for the coldest surface to land on. In most London flats, that surface is:

• The external wall behind your sofa
• The corners of the ceiling (especially north-facing ones)
• Single-glazed sash windows
• Behind heavy furniture

A client in Battersea called us last month convinced she had a roof leak. The wall was soaking wet. It wasn’t the roof. She was drying four loads of laundry a week on airers in a room with the windows shut tight. The walls were essentially drinking the laundry water.

The 3 Golden Rules for Indoor Drying

If you must dry inside, you have to change your tactics. Here is how you do it without inviting mould spores to move in.

1. The Extra Spin Cycle

This is the easiest win. Most washing machines have a default spin setting (usually 1200 rpm). Once the cycle finishes, run a separate ‘Spin and Drain’ cycle on the highest setting your clothes can handle (1400 or 1600 rpm).

It takes 10 minutes. It extracts an extra cup or two of water. That is water that won’t end up on your walls.

2. Location, Location, Location

Never dry clothes in your bedroom if you can avoid it. You breathe out moisture all night; adding wet clothes creates a humidity bomb.

Best spot: The bathroom (if it has an extractor fan) or the kitchen. Close the door to that room. Open the window slightly. Create a “drying zone” rather than spreading wet clothes throughout the flat.

3. The “Burp” Method

In winter, you don’t want the window open all day. Heating is expensive. Instead, use the “burp” method.

• Open the windows wide for 10 minutes.
• Let the moist air rush out and dry air rush in.
• Close them again.
• Repeat this 3 times a day.

This exchanges the air without cooling down the walls too much.

The Great Debate: Dehumidifier vs. Heated Airer

We get asked this constantly. “Should I buy a heated airer?”

If you are worried about mould, the answer is usually No. Buy a dehumidifier instead.

Please, Stop Using Your Radiators

We walked into a flat in Hackney last week that was covered in mould removal needs—black spots everywhere. Every single radiator in the hallway and living room was draped with wet jeans and towels.

Why this is a disaster:

1. It blocks the heat: Your boiler works harder to heat the room, costing you more money.
2. It creates a moisture cloud: The water evaporates instantly and hits the cold wall above the radiator. This is why you often see peeling paint or mould patches right above heaters.
3. It creates cool spots: By blocking the heat distribution, other corners of the room stay cold, making them perfect breeding grounds for condensation.

Use a clothes horse. Put it near the radiator, but not on it.

Signs You’ve Got It Wrong

Mould doesn’t appear overnight. It gives you warnings. If you ignore these, you’ll be calling us in six months.

When DIY Isn’t Enough

Sometimes, despite your best efforts, the mould takes hold. London buildings can be stubborn. If you have tried better ventilation and drying habits but the black spots keep coming back, the issue might be deeper than just wet laundry.

It could be penetrating damp from outside, or condensation that has soaked into the plaster. Once mould roots into the wall, wiping it with bleach won’t fix it (and please don’t use bleach, it often makes it worse long-term).

Common Questions About Drying Laundry