by It’s one of the most common questions from anyone refitting a kitchen: is an extractor fan a legal requirement in the UK, or is it just good practice? The answer surprises a lot of people — because it’s both simpler and more nuanced than the forums suggest.
Short version: there’s no single law saying “every kitchen must have an extractor fan”. But building regulations do require adequate ventilation in kitchens, and in practice that usually means an extractor — especially in new builds and renovations. Here’s how it actually works.
What Does the Law Actually Say?
UK building regulations (specifically the ventilation rules, known as Part F of the Building Regulations in England) require that kitchens have adequate means of ventilation to remove moisture, cooking smells and indoor pollutants. That’s the legal duty — stated in general terms, not as “you must fit a 60cm chimney hood”.
How you meet that duty is where extractor fans come in. The regulations’ guidance describes acceptable ways to ventilate a kitchen, and for most homes that means either:
- An intermittent extract fan (a cooker hood or wall fan) that vents to outside, sized to shift a decent volume of air — the guidance suggests around 30 litres per second for a fan near the hob, or 60 litres per second elsewhere in the kitchen; or
- A continuously running low-level system (whole-house ventilation) that keeps background air moving all the time.
In plain English: the law demands the result (a properly ventilated kitchen), and an extractor fan ducted to outside is the standard way to achieve it. Scotland and Wales have their own equivalent building standards saying much the same thing.
When Do Building Regulations Apply to Your Kitchen?
This is the crucial bit most guides skip. Building regulations don’t police your existing kitchen day to day — they kick in when building work happens. So:
- New builds: yes — a new kitchen in a new home must meet the ventilation requirements, which in practice means a proper extractor.
- Extensions and conversions: yes — if you’re extending the kitchen or converting a space into one, building control will expect compliant ventilation.
- Full kitchen refits: usually yes in practice — while like-for-like replacements of a cooker hood don’t need approval, a full rip-out-and-replace is building work, and meeting current ventilation standards is expected.
- Just swapping an old hood for a new one: no approval needed — it’s maintenance, not building work. (Though fitting a decent one is still wise.)
Nobody is going to inspect the kitchen you’ve lived with for 20 years and fine you for having no extractor. But if you’re doing notifiable work, ventilation is one of the things building control checks.
Do You Need an Extractor Fan with a Gas Hob?
This is where a second set of rules enters the picture. Gas safety regulations require adequate ventilation and flueing for gas appliances — but that’s about combustion safety (making sure the boiler or hob gets enough air and fumes can’t build up), not about cooking smells.
A cooker hood is not a legal requirement for a gas hob specifically. What matters for gas is that the room has enough permanent ventilation (air vents) for the appliance’s rating, and that installation and servicing are done by a Gas Safe registered engineer. Many people conflate the two — but “my gas hob needs an extractor by law” isn’t quite right. It needs safe ventilation; a cooker hood is the convenient way to also deal with the steam and grease.
That said, gas hobs produce nitrogen dioxide and carbon monoxide in small amounts along with a lot of moisture, so a properly ducted extractor is strongly recommended over gas — arguably more so than over induction or electric.
Ducted vs Recirculating: Does the Law Care?
Yes — this distinction matters. A ducted extractor pushes air outside through ducting. A recirculating hood just filters it through charcoal filters and blows it back into the room.
For building regulations purposes, it’s the ducted-to-outside version that counts as ventilation. A recirculating hood deals with smells and some grease, but it doesn’t remove moisture — so it doesn’t satisfy the ventilation requirement on its own. If building control is involved, they will want to see ducting to an outside wall or roof.
In practice, plenty of kitchens (especially flats where ducting is hard) use recirculating hoods and get by fine — they’re far better than nothing. But if you’re doing work that needs sign-off, plan for ducting from the start, because retrofitting it after the kitchen is fitted is miserable.
What About Landlords and Rental Properties?
Landlords have extra duties. Beyond building regulations, landlords must ensure rental homes are free from hazards under housing health and safety rules — and persistent condensation, damp and mould caused by poor kitchen ventilation can absolutely count as a hazard.
In practice, that means a rented kitchen without any extractor is a risk for the landlord: if mould develops and the tenant complains to the council, “there was no extractor” won’t be a good defence. Most letting agents now expect a working cooker hood as standard. Tenants, meanwhile, can’t usually be forced to use it — but landlords are wise to fit one and explain why it matters.
What Happens If You Don’t Have One?
Let’s be realistic about consequences:
- No extractor in an existing kitchen: nothing legal happens. But you’ll likely get more condensation on windows and walls, lingering cooking smells, and grease settling on surfaces — over years, that means mould risk and tired-looking paintwork.
- No compliant ventilation in notifiable building work: building control can refuse sign-off, which causes problems when selling (buyers’ solicitors ask for completion certificates).
- Landlord ignoring ventilation: enforcement action from the local council if damp and mould affect tenants’ health.
The non-legal consequences are honestly the bigger deal for most homeowners. A £150–£400 extractor is cheap insurance against the slow damage that steam does to a kitchen — and it makes the room far pleasanter to cook in. Finish the job properly with suitable kitchen curtains and blinds that can handle a steamy environment, and the whole room lasts longer.
Frequently Asked Questions
Is an extractor fan a legal requirement in a UK kitchen?
Not as a standalone law — but building regulations require adequate kitchen ventilation, and an extractor fan ducted to outside is the standard way to meet that requirement in new builds, extensions and major refits. For an existing kitchen with no building work happening, there’s no legal duty to retrofit one.
Do I need building control approval to fit a cooker hood?
A straight like-for-like replacement doesn’t need approval. But if you’re refitting the whole kitchen or doing an extension, ventilation forms part of the building work and building control will expect it to meet current standards — which usually means ducted extraction to outside.
Does a recirculating cooker hood meet building regulations?
Generally no, on its own. Recirculating hoods filter smells and grease but don’t remove moisture to outside, so they don’t count as ventilation for building control purposes. They’re better than nothing, but ducted extraction is what’s expected where regulations apply.
Is a cooker hood required by law over a gas hob?
No — gas safety rules require safe ventilation for the appliance, not specifically a cooker hood. However, a ducted extractor is strongly recommended over gas hobs because gas cooking produces more moisture and combustion pollutants than electric or induction.
Can a landlord be fined for no extractor fan?
There’s no specific fine for “no extractor fan”, but landlords have a duty to keep homes free of damp and mould hazards. If poor kitchen ventilation leads to condensation and mould affecting tenants, the local council can take enforcement action — so most landlords fit one as a matter of course.
The Bottom Line
Is an extractor fan a legal requirement in the UK? Not by name — but the ventilation it provides effectively is, whenever building regulations apply. And even where the law doesn’t reach, your walls, paintwork and lungs will thank you for fitting one anyway.
