Odour may not be visible, but it can cause significant problems when it comes to planning applications. Whether your development is near a takeaway, sewage works, farm, or food-processing facility, smells can trigger public complaints, planning conditions, or even refusals. That’s why an odour risk assessment is essential for many UK developments.
In this blog, we explain how these assessments work — and how having one in place can save time, money, and hassle throughout the planning process.
What is an Odour Risk Assessment?
An odour risk assessment evaluates the potential for offensive smells to affect sensitive developments, particularly new housing or hospitality uses. It considers both the likelihood of odour exposure and the potential impact on residential amenity, using structured methods such as those recommended by the Institute of Air Quality Management (IAQM).
The process often includes:
- Identification of local odour sources
- Review of meteorological data (e.g. prevailing winds)
- Receptor sensitivity analysis
- Qualitative or quantitative assessment of risk
- Mitigation advice where needed
It provides planning officers with the evidence they need to determine whether a proposal is acceptable in its current form — or if further controls are required.
How Odour Risk Can Delay Planning Approval
1. Lack of Supporting Information
Planning applications that don’t address nearby odour sources risk being classed as “invalid” or face requests for additional information. This not only causes delays but may also raise concerns about the overall quality of the submission.
Odour risk assessments address these gaps upfront, helping smooth the way through validation and consultation stages.
2. Environmental Health Objections
Environmental Health Officers (EHOs) may object to applications if they believe future residents could be exposed to odour nuisance. These objections can significantly slow down determination times and may require retrospective assessment or redesign.
Having an odour risk assessment already in place enables proactive mitigation and informed responses to EHO feedback.
3. Planning Conditions and Appeals
Without an odour assessment, planning authorities may impose broad or poorly defined conditions — such as requiring further odour control or management plans post-permission. These can be costly to discharge and may hold up construction start dates.
An assessment supports better, more proportionate conditions — or helps eliminate the need for them entirely.
When is an Odour Risk Assessment Required?
You should consider commissioning an odour risk assessment if your development:
- Introduces housing or hotels near restaurants, farms, sewage treatment, or industrial premises
- Involves a change of use to more sensitive uses (e.g. offices to residential)
- Is located near any facility regulated by the Environment Agency for odour emissions
- Triggers pre-application advice recommending assessment
Benefits of an Early Assessment
- Speeds up validation by addressing likely issues in advance
- Reduces objection risk from neighbours and environmental health
- Supports planning compliance by demonstrating consideration of amenity
- Informs better design by guiding orientation, layout, and ventilation choices
- Avoids rework by identifying problems before submission
At Hawkins Environmental, we specialise in delivering practical, policy-aligned odour risk assessments that help unlock planning success for UK developers.
Planning delays can be costly — but they’re often avoidable with the right preparation. A professional odour risk assessment gives planners the clarity they need and helps applicants avoid nasty surprises. Whether you’re dealing with agricultural, food-related, or industrial odour risks, we can support you in navigating requirements and getting it right first time.
Contact us today
Phone: 01256 522332
Email: enquiry@hawkinsenvironmental.co.uk
Air Quality Assessment Services
FAQs
Q1: Can an odour risk assessment be added after a planning application is submitted?
A1: Yes, but it’s better to include it at the outset. Adding it later may delay the application or complicate the planning officer’s recommendation.
Q2: How long does an odour risk assessment take to complete?
A2: Most assessments are completed within 5–10 working days, depending on site complexity and data availability.
Q3: Are there formal UK standards for odour levels?
A3: There are no binding UK odour limits, but the IAQM guidance is widely accepted by planning authorities for assessing and managing odour risk.