WHY DOES
COOKING SMELL
LINGER IN MY HOUSE?

The Science of Why Cooking Smell Lingers

Cooking releases aerosols — microscopic droplets of fat, oil, spice and protein — into the surrounding air. These particles are far smaller than visible smoke and travel much further. They settle on every surface they encounter: walls, ceilings, curtains, furniture, carpets and clothing.

Once settled, the odour compounds in these aerosols bind to the surfaces they land on. Porous materials — plaster, timber, paint, fabrics — absorb them below the surface level. As the room temperature rises, these embedded compounds volatilise back into the air. This is why a kitchen can smell of last night’s dinner even after hours of ventilation.

The chemistry varies by food type. Spice compounds (from curry, cumin, fenugreek) are particularly persistent because of their strong aromatic molecular structure. Fish and shellfish produce amine compounds (trimethylamine) that are highly volatile and detectable at very low concentrations. Frying and deep-frying produces acrolein and other aldehydes that are pungent and chemically reactive with surfaces.

Factors That Make Cooking Smell Worse

• Poor ventilation: Without adequate airflow, cooking aerosols accumulate in the air and settle on nearby surfaces rather than being carried away. An effective extractor fan directly over the hob makes a significant difference.
• Open-plan layouts: Kitchens open to living and dining areas allow cooking aerosols to spread throughout the entire space rather than being contained.
• Soft furnishings near the kitchen: Sofas, curtains and rugs in open-plan spaces absorb cooking compounds quickly and release them slowly over time.
• Long duration or frequent cooking: The more cooking, the greater the accumulation of surface deposits over time.
• Strong-smelling cuisines: South Asian, Middle Eastern and East Asian cooking with high spice content and frying produce the most persistent odours.
• Older properties: Porous plaster, timber and brick absorb odour compounds more readily than modern materials.

Quick Fixes That Actually Help

• Use your extractor fan consistently: Run it during cooking and for at least 15–20 minutes afterwards. Clean the filter regularly — a saturated filter recirculates grease rather than extracting it.
• Open windows during and after cooking: Cross-ventilation is more effective than a single open window.
• Wipe down surfaces promptly: Cleaning kitchen surfaces while still warm after cooking removes aerosol deposits before they set.
• Wash soft furnishings regularly: Curtains and cushion covers in open-plan spaces absorb cooking aerosols continuously. Regular washing significantly reduces background odour.
• Simmer lids on pots: Reduces aerosol production at source.

When Quick Fixes Are Not Enough

If cooking smell persists despite good ventilation habits and regular cleaning, the odour compounds have penetrated beyond what surface measures can address. This typically becomes apparent when:

• The smell is noticeable when entering the property after being away
• Non-cooking household members or guests comment on the smell
• The smell is present even after thorough cleaning
• The property is being prepared for sale or letting and viewers will notice

Professional Treatment for Persistent Cooking Odour

Our cooking odour removal process addresses the problem at every level — surface residue, embedded compounds and airborne particles:

1. Specialist degreasing of all kitchen and affected surfaces (Complete package)
2. ULV cold fogging with specialist odour-neutralising solution throughout the property
3. Monitored industrial ozone treatment neutralising residual VOCs in the air and on surfaces
4. Ionisation and ventilation

Cost of Cooking Smell Removal in London

• Advanced (fogging + ozone): from £695 + VAT
• Complete (surface treatment + fogging + ozone): from £1,350 + VAT

Full pricing guide →