How Odour Affects Hotel Reviews
TripAdvisor, Google and Booking.com review data consistently shows smell as one of the most frequently mentioned factors in negative hotel reviews — and one of the most memorable. A guest who found the room uncomfortable due to smell will mention it specifically; a guest who found the room pleasant-smelling will rarely mention it at all. The review impact is asymmetric: smell problems generate mentions, smell neutrality does not.
For London hotels and serviced apartments in a competitive market, a pattern of smell-related reviews suppresses booking rates and pushes potential guests toward alternatives. The cost of professional treatment per room (£495–£695) is typically recovered within 1–2 additional nights of occupancy at the room’s standard rate.
Main Odour Sources in Hotel Rooms
- Unreported smoking: By far the most impactful and most difficult to manage. Guests who smoke indoors do so with windows open, in the bathroom with the extractor running, or in ways they believe will not be detected. The smell compounds embed in soft furnishings, walls and HVAC ducts and persist for subsequent guests.
- General guest habitation: Body odour, sebaceous oils and moisture from occupancy accumulate in mattresses, pillows, upholstered furniture and carpet over hundreds of guest stays. Regular laundering manages fabric items; the foam core of mattresses and the backing of carpets accumulate compounds that laundering does not address.
- Food and beverage: In-room dining and alcohol consumption produce odour compounds that absorb into fabric and carpet. Spills that are not fully cleaned leave fermentation compounds.
- En-suite bathroom: Drain biofilm, inadequate extractor fans, and failed grout or sealant around baths and showers produce persistent bathroom odour that guests notice immediately.
- Pet odour: In pet-friendly rooms, dander and urine accumulate in carpet and on upholstered furniture over time.
Unreported Smoking: The Critical Issue
Unreported smoking is the highest-impact odour situation for hotel rooms. A room that has been smoked in — even for a single night — will produce a clearly detectable cigarette smell for the next guest within hours of check-in. The typical outcome is a one or two-star review mentioning the smell specifically, with the implication that the hotel’s cleaning standards are poor.
Detecting unreported smoking:
- Cigarette smell noticeable to housekeeping on room inspection
- Yellow-brown staining on ceiling near windows or in the bathroom
- Ash residue near windows, on balconies or in bathroom bins
- Smoke detectors triggered during the guest’s stay
A room confirmed or suspected of indoor smoking should not be occupied again without professional treatment. Thorough housekeeping will improve the visual condition but will not remove the smell compounds from walls, ceiling, mattress foam and curtains. The next guest will notice within minutes of entering.
Treatment for a confirmed smoking room typically takes 4–6 hours. We can often accommodate same-day treatment with morning notification.
Managing General Guest Habitation Odour
For rooms with no specific incident, general habitation compounds accumulate gradually over many guest stays. The mattress foam, carpet backing and upholstered furniture absorb body odour compounds that regular laundering does not reach. At low levels this is not noticeable to individual guests; as it builds over months it contributes to a “hotel smell” that some guests find off-putting.
Periodic professional treatment — quarterly or bi-annually for high-occupancy rooms — resets the compound level in these materials. This is particularly relevant for:
- Rooms that receive very high occupancy (near 100% year-round)
- Rooms where mattresses and upholstery have not been replaced recently
- Pet-friendly rooms where dander accumulation is ongoing
- Ground floor or basement rooms where damp is a contributing factor
En-Suite Bathroom Odour
Bathroom odour is a common complaint in hotel reviews and is almost always preventable:
- Drain biofilm: Monthly enzyme drain treatment prevents biofilm accumulation in waste pipes. This is the most cost-effective preventive measure for bathroom smell.
- Extractor fan maintenance: Clean grilles and check airflow quarterly. Replace failed units promptly.
- Sealant and grout inspection: Failed or mouldy sealant around baths and showers produces musty smell that guests notice immediately. Re-seal annually.
- Dry P-traps in unoccupied rooms: Run water in all drains before a room is put back into service after any period of non-occupation.
Treatment Between Guests
Professional room treatment uses a three-stage approach:
- ULV cold fogging: Specialist odour-neutralising solution applied throughout the room including inside wardrobes, behind furniture and into the en-suite. Reaches into fabric fibres and carpet backing.
- Monitored ozone treatment: Industrial ozone run throughout the room with real-time monitoring. Neutralises airborne VOC compounds and surface-embedded compounds throughout the room.
- Safe re-entry confirmation: O₃ levels confirmed safe before housekeeping re-enters and the room is prepared for the next guest.
For a confirmed smoking room, surface treatment of walls and ceiling with specialist agents precedes fogging and ozone.
Scheduling and Turnaround
We work flexibly around hotel checkout and check-in schedules:
- Same-day treatment with morning notification in most London locations
- Next-day guaranteed availability
- Treatment completes within 4–6 hours for a standard hotel room
- Room ready for housekeeping and next check-in within 6–8 hours of treatment start
Documentation
Written treatment documentation provided on request for each room treatment, including methods, date, areas treated and confirmation of safe re-entry. Useful for:
- Responding to guest complaints or review platform queries
- Charging smoking damages to the guest who caused them (via OTA dispute process)
- Internal quality management records
- Insurance claims if applicable
Cost
- Standard hotel room (fogging + ozone): from £495 + VAT
- Confirmed smoking room (surface treatment + fogging + ozone): from £695 + VAT
- Serviced apartment / suite: from £695 + VAT
Volume rates available for hotels treating multiple rooms. Contact us to discuss rates →