Do Cooker Hoods Need to Vent Outside?

When planning your kitchen, one of the most common questions is whether a cooker hood needs to vent outside. The short answer is no—but it’s usually the best option if you want maximum performance.

Should Cooker Hoods Vent Outside?

In most kitchens, venting your cooker hood outside is the best choice for performance. A ducted system removes contaminated air entirely rather than filtering and reusing it.

• Removes steam, grease and odours completely
• Reduces condensation and mould risk
• Improves air quality in open-plan kitchens
• Ideal for frequent or high-heat cooking

What If You Don’t Have an Outside Wall?

If your hob is positioned on an island or internal wall, external ducting may not be practical. In these cases, a recirculating cooker hood is often the best solution.

Modern kitchens—especially flats and apartments—commonly rely on recirculating systems due to layout restrictions.

What Is a Recirculating Cooker Hood?

A recirculating hood draws in air, passes it through grease filters and carbon filters, then releases it back into the room.

• No external ducting required
• Easier and cheaper installation
• Suitable for most layouts
• Requires regular carbon filter replacement

Ducted vs Recirculating

UK Ventilation Rules

In the UK, cooker hoods are not legally required to vent outside. However, kitchens must have adequate ventilation under Building Regulations Part F.

Final Verdict

While a cooker hood doesn’t have to vent outside, a ducted system is the best choice for performance and air quality. If ducting isn’t possible, a recirculating hood is still a practical and effective solution for most homes.