When we think of environmental impacts, odour might not be the first issue that comes to mind — but for local authorities and communities, it can be a major concern. An odour assessment is often a required part of the planning process, especially for developments near commercial kitchens, agriculture, or industrial facilities.
In this article, we explain what an odour assessment involves, when it’s needed, and why it’s critical for achieving planning success in the UK.
What is an Odour Assessment?
An odour assessment evaluates the potential for unpleasant smells to affect the amenity of a proposed or existing development. It helps determine whether emissions from a nearby or on-site source — such as food outlets, waste processing sites, or agricultural activity — could negatively impact future residents or businesses.
Assessments are often based on IAQM (Institute of Air Quality Management) guidance and may include:
- Odour source identification and characterisation
- Assessment of wind direction, topography, and distance to receptors
- Field surveys or dispersion modelling
- Risk rating and mitigation recommendations
Why is an Odour Assessment Important for Planning?
1. Protecting Residential Amenity
Odour can seriously affect quality of life. If a development is located near a known odour source — or if the proposal itself may generate odour — planning authorities must ensure that residents won’t be exposed to unreasonable nuisance or health impacts.
An odour assessment provides evidence-based reassurance that this has been considered and managed.
2. Reducing Planning Risk
Local authorities increasingly request odour assessments at validation stage or following consultee feedback. Submitting a robust report early in the process helps avoid delays, conditions, or outright refusals due to lack of information.
It’s particularly relevant where:
- A new residential development is proposed near restaurants, waste facilities, farms, or sewage works
- A development includes food processing or waste handling
- A prior approval or change of use may increase human exposure to odour sources
3. Demonstrating Compliance
An odour assessment shows that the applicant understands and has addressed relevant planning policies — including those under the NPPF, which require that development avoids unacceptable risks to human health and the environment.
Some local plans also contain specific policies about odour and amenity, making assessment even more important for gaining approval.
What Does an Odour Assessment Include?
A standard odour assessment will typically contain:
- Site context and background information
- Details of odour sources (e.g., type of activity, emission rate, controls in place)
- Receptor sensitivity analysis based on proximity and land use
- Meteorological data to model dispersion patterns
- Qualitative or quantitative analysis, including modelling if required
- Clear conclusions and mitigation proposals
Examples of Developments Requiring Odour Assessment
- Residential developments near food outlets or takeaways
- Hotels or flats above commercial kitchens
- Dwellings near intensive farming or composting facilities
- Waste handling or materials recovery sites
- Change of use proposals introducing sensitive uses near odour sources
Even in less obvious cases, early advice from an environmental consultant can help identify whether an odour assessment is needed — and how best to approach it.
An odour assessment may not be the most high-profile element of a planning application, but it can make all the difference when it comes to approval. By identifying and mitigating risks early, developers can avoid objections, maintain good neighbour relations, and demonstrate their commitment to delivering high-quality environments.
At Hawkins Environmental, we provide professional, policy-aligned odour assessments to support planning applications across the UK.
Contact us today
Phone: 01256 522332
Email: enquiry@hawkinsenvironmental.co.uk
Air Quality Assessment Services
FAQs
Q1: Who decides if an odour assessment is needed?
A1: The local planning authority may require one, especially if Environmental Health Officers (EHOs) raise concerns during pre-application discussions or consultation.
Q2: Can an odour assessment be done after planning is submitted?
A2: Yes, but it’s better to include it early. Late submissions may delay determination or lead to planning conditions that could have been avoided.
Q3: What if odour is detected but cannot be eliminated entirely?
A3: A well-prepared assessment will propose mitigation — such as extraction systems, increased separation, or building design changes — to ensure impacts are reduced to acceptable levels.