Odour Investigation

Where building odours can originate

Drainage odours may enter through dry traps, defective seals or little-used facilities. Kitchen extract can cross-contaminate offices where discharge air reaches an intake or leaks between tenancies. New finishes, adhesives and cleaning products can release volatile organic compounds. Damp materials and mould may produce musty smells, while neighbouring premises can contribute cooking, process or waste odours. Exhaust air can also be re-entrained when wind direction and plant schedules coincide.

• Drainage routes, floor gullies, washrooms and dry traps
• Kitchen extract discharge and transfer between occupied areas
• Fit-out materials, furnishings, adhesives and cleaning products
• Damp finishes, concealed moisture and mould growth
• Exhaust re-entrainment, external sources and neighbouring premises

Odour description and likely checks

Descriptions are subjective, but a consistent description can guide the first inspection. We compare the reported character with its location, timing and likely transport route before deciding whether sampling would add useful evidence.

How the investigation is carried out

We begin with an odour log completed by occupants or the facilities team. It records where the odour is noticed, its character, strength, start and finish times, weather or occupancy observations, and whether ventilation or catering plant was operating. During the walk-through we follow the complaint route, inspect adjoining spaces and compare affected and unaffected locations. We then check whether the pattern changes with HVAC start-up, shutdown, pressure relationships, open doors or local extract operation.

1. 1

   Define the pattern

   Review reports, plans, plant schedules and an occupant odour log to identify repeatable conditions.

2. 2

   Trace possible pathways

   Walk through affected rooms, risers, service areas, intakes, exhausts and relevant drainage points.

3. 3

   Test a focused hypothesis

   Use targeted VOC or sulphur-compound sampling where it can distinguish credible sources; sampling is not automatic.

4. 4

   Compare operating conditions

   Relate observations to HVAC, extract, occupancy, cleaning, deliveries and neighbouring activities.

5. 5

   Set out practical actions

   Record evidence, likely pathways, uncertainties and the specialist trade needed for correction.

Sampling, duration and interpretation

A site visit may be enough where a source and pathway are observable. Intermittent events can need repeat observations during the reported period. Real-time instruments show broad VOC and environmental changes but cannot identify every chemical. Laboratory sampling may be selected when the history supports a defined question. Locations include the complaint area, comparison space and plausible entry points. Results are interpreted with the odour log and ventilation state.

Outcomes and specialist referrals

The report distinguishes confirmed observations from likely explanations and unresolved possibilities. It may recommend restoring water seals, checking drainage integrity, changing product storage, reviewing cleaning practices, separating extract and intake pathways, or investigating damp materials. Plumbing defects are passed to a competent plumbing or drainage contractor. Mechanical plant, controls and pressure issues are referred to the building's HVAC contractor. Follow-up observation can check whether the reported pattern has changed after work.

Is this the right page?

Choose VOC and Formaldehyde Testing when the main question concerns emissions from materials or a fit-out. Choose Ventilation Problem Investigation when stuffiness, poor air distribution or HVAC operation is the central concern.