The Closed-Window Season: Planning Kitchen Ventilation Before Winter Shuts You In

By November 2026, most of us have quietly closed the windows for the season. The kitchen becomes the warmest room in the house, the slow cooker comes out, and Sunday lunch steams up the glass before the plates are even cleared. That is usually the moment when ventilation stops being a background detail and starts making itself known.

If you are planning a kitchen renovation, this is the point to think about extraction properly. Not as a hob hood chosen in a hurry at the end of the project, but as part of the room’s design. Get it right and you barely notice it. Get it wrong and you spend the winter wiping condensation off the windows and wondering why the cupboards feel slightly tacky.

A hood is not the whole system

It is tempting to think of ventilation as one appliance: the extractor over the hob. In practice, it is a small system made up of the hood itself, the route the air takes, the air that replaces it, and the way you use the room day to day. Miss any one of those and the rest has to work harder.

That matters more in modern homes than many people expect. New-build kitchens are often airtight, which is good for warmth and energy bills but bad for moisture if no planned airflow is in place. Older Victorian terraces are draughtier, but they still produce plenty of steam and cooking grease. A leaky sash window is not a ventilation strategy.

Ducted versus recirculating: the honest trade-off

A ducted hood sends cooking air outside. It removes moisture, smells and grease-laden vapour, and it is generally the better choice if the duct route is short and sensible. The catch is that ducting needs a clear path to an outside wall or roof, and that path needs planning before ceilings, joists and cabinetry are finalised.

A recirculating hood pulls air through a filter and sends it back into the room. It can deal with some odours and grease, but it does not remove moisture. In a small, shut-up kitchen, that distinction matters. Recirculating models can be a good solution where ducting is genuinely impossible, especially if they are specified with proper carbon filters and maintained, but they should not be treated as a magic fix for a steamy room.

If you are choosing between the two, be honest about the room. A short, straight duct to an outside wall is worth prioritising at design stage. A long, bendy route through a cold loft is less effective and noisier than the brochure suggests. And if you go recirculating, plan for filter access and replacement rather than discovering it after the cabinets are in.

Where the damage shows up first

Poor ventilation rarely announces itself dramatically. It shows up as condensation on north-facing windows, a faint damp smell near the splashback, or mould creeping into silicone joints. Steam settles on cool surfaces, and in a kitchen that means windows, walls and the undersides of wall units.

Grease is the slower problem. It travels in the air as fine vapour and settles on high shelves, extractor filters, cupboard doors and anything nearby. Over time it dulls finishes and makes cleaning harder. A hood that is undersized, badly ducted or simply never switched on will not stop that film forming.

The practical habits are simple: use the hood every time you cook, not just when something smokes, and let it run for ten to fifteen minutes afterwards. Use pan lids where you can. Wipe filters regularly. These small routines make a bigger difference than a last-minute upgrade after the problem appears.

The airtight-home problem

In a well-sealed modern home, an extractor needs replacement air to work. If the room is sealed tight, the fan has to pull against resistance, and the result can be noisy, weak extraction or unwanted draughts from elsewhere. Sometimes a powerful hood can even disturb flues or draw smells from other rooms if the airflow balance is poor.

This is where planned ventilation comes in. Trickle vents, background ventilators, undercut doors and mechanical ventilation with heat recovery may all play a part in a modern renovation. The right answer depends on the house, but the principle is consistent: air has to get in if it is going to get out. Do not seal every gap and then expect a hob hood to solve the whole problem on its own.

Plan it before the first fixing

The most expensive ventilation mistake is leaving it until the appliances are being fitted. By then, the duct route is often decided by whatever gap remains. Better decisions happen earlier: position the hob near an outside wall where possible, agree the duct route before ceilings are closed, allow space for a service void, and check that the chosen hood has the extraction rate and noise level you can live with.

It is also worth checking the building regulations position for your project, particularly around kitchen extraction and ventilation. A good installer will know what is required, but the design conversation should happen before the plaster goes on. If you are renovating a kitchen in a flat or terrace, communal ducting and external flaps need thought too.

A practical November checklist

Before the cold really settles in, give the kitchen a ventilation once-over. Clean or replace the grease filters. Check that the external flap opens freely and is not jammed with debris. Make sure trickle vents are open rather than painted shut. Listen to the hood: if it sounds strained, the duct route or replacement air may be the issue. And if condensation is pooling on the windows every time you boil pasta, treat that as useful information rather than a seasonal nuisance.

Ventilation is one of those parts of a kitchen that nobody admires, but everyone feels. Done well, it keeps the room fresher, protects the finishes and makes winter cooking feel less like a battle with the windows. Done late, it becomes an expensive retrofit. As the shut-window season begins, it is worth giving the air in your kitchen as much thought as the worktops and cabinets.