Buyer Behaviour and Smell
Every experienced estate agent knows that smell matters — but it is worth understanding precisely why, because this informs how to have the conversation with vendors who may be defensive about the subject.
Smell is processed by the olfactory bulb, which has a direct connection to the limbic system — the brain regions responsible for emotional response and memory. Unlike visual or auditory information, smell bypasses the rational processing areas of the brain and generates an immediate emotional reaction. This is why a bad smell in a property creates a feeling of discomfort that the viewer cannot easily reason themselves out of, regardless of how positive the visual aspects are.
In practical terms: a buyer who smells cigarette smoke on entering a property has already formed a negative emotional impression before they have looked at a single room. Every subsequent positive visual impression is fighting against that initial gut response. Even viewers who try to remain rational and view the property on its merits will unconsciously discount it compared to an equivalent property that smelled neutral.
Signals That Smell Is Affecting a Listing
These are the patterns that often indicate smell is a silent factor in a property’s performance:
- Multiple viewings with no offers on a correctly priced property
- Vague viewer feedback (“it didn’t feel right,” “not sure about the condition”)
- Second viewings being declined or not progressing to offer
- Offers significantly below asking that cite “condition” without specifying issues
- Properties attracting offers only after a price reduction that moves them into a lower band
- Viewers asking about previous occupants’ habits or smoking history
Most Impactful Odour Types for Property Sales
- Cigarette/tobacco smoke: The highest-impact property odour in the current market. Buyers associate it with deep contamination, thirdhand smoke health risks and a property that requires significant remediation. Can eliminate a significant portion of potential buyers entirely — particularly families with young children.
- Cat urine: Extremely aversive and immediately identifiable. Non-cat-owners find it deeply off-putting. Cat urine in carpet or floorboards is very resistant to cleaning and buyers know this.
- Damp and mould: Creates strong associations with structural problems and expensive remediation, regardless of whether the source has been fixed. Even residual MVOC smell after the damp is resolved continues to suggest an ongoing problem.
- Dog smell: Less severe than cat urine but significant for non-dog-owner buyers. Particularly noticeable in carpets, sofas and hallways.
- Cooking (curry/spice/fish): Moderate impact but still affects buyer impression. More common in flats and terraced houses where cooking smells cannot dissipate through large volumes of air.
Having the Conversation with Vendors
Vendors are often unaware of their property’s smell because they have habituated to it — the same way you stop noticing the smell of your own home. This makes the conversation delicate. Practical approaches:
- Frame it as market intelligence, not personal criticism: “I want to share some feedback patterns we typically see from buyers in properties like this” — not “your property smells.”
- Use the financial argument: “The cost of treatment is around £X. In our experience, buyers who identify a smell issue typically negotiate a reduction of £Y–£Z. The treatment is worth considering as a pre-emptive measure.”
- Invite them to do the fresh-nose test: Ask them to leave the property for two hours and re-enter as if for the first time. Most vendors, doing this, will notice what they have been habituated to.
- Wait until after the first round of viewings if needed: If a vendor is initially resistant, a round of viewings that produces vague feedback or no offers can make them more receptive to the conversation.
Why Masking Does Not Work (and Makes Things Worse)
The common vendor response to a smell concern is to buy air fresheners, burn candles during viewings, or have fresh flowers in every room. Experienced agents and buyers see through these immediately — a strongly fragranced property raises the question of what is being hidden, and sophisticated buyers become more vigilant rather than less.
More practically: masking products are temporary. They do nothing to the embedded smell compounds in the walls, carpets and soft furnishings. As soon as the fragrance disperses, the underlying smell returns. A viewer who notices a heavy fragrance during a viewing may well smell the underlying problem on a second viewing without the fragrance cover.
The only honest and durable solution is to remove the smell compounds from the property, not to cover them.
What Professional Treatment Achieves
For agents who have not worked with professional odour remediation companies before, it is worth understanding what the treatment actually does and does not achieve:
- What it achieves: Permanent neutralisation of embedded odour compounds in surfaces throughout the property. A genuinely neutral-smelling result that does not rely on fragrance or cover. Treatment documentation for the vendor and any queries from buyers.
- What it does not achieve: It cannot reverse structural damage (damp staining, nicotine-stained walls still need repainting). It does not fix the source of an ongoing problem (an active damp issue will produce smell again after treatment). For very severe contamination involving decades of heavy smoking in old properties with lime plaster, a significant improvement is achievable but 100% elimination may require replastering.
A reputable treatment company will tell the vendor honestly what is achievable for their specific property before any work begins.
Timing and Marketing
The ideal sequence for a property with an odour concern:
- Any pre-sale redecoration completed
- Professional odour treatment
- 48–72 hours ventilation after treatment
- Photography
- Listing and viewings
Treatment typically takes 4–10 hours depending on property size. The property can be re-entered safely the same day (confirmed by real-time ozone monitoring). Photography can proceed 48 hours after treatment.
Referring Vendors: What to Tell Them
For agents who refer vendors to professional treatment, the key points to communicate:
- The treatment eliminates the smell at the source — it is not fragrance or masking
- It is safe for the property and leaves no residue
- The property can be re-occupied and marketed the same day
- A written treatment report is provided for their records
- Cost is typically £495–£1,350 + VAT depending on property size and odour type