Ventilation statement outline for a coffee roastery
Roasting is a process emission rather than kitchen odour, and the abatement, the flue and the use class all follow from that. Here is the order to write it in.
A coffee roastery ventilation statement has to do something a kitchen extract statement does not: describe a batch process with a changing emission profile, and show how the abatement handles the worst few minutes of each cycle rather than a steady state. The smoke and volatile compounds released in the last part of a dark roast, and again at the point the drum is dumped, are what generate complaints. An assessment written around an average is an assessment that will be queried.
Start by settling the use class, because that decision shapes the rest of the application. A roastery with a shop or cafe attached may fall within Class E, where the roasting itself is an industrial process that can be carried out in a residential area without detriment to amenity under Class E(g)(iii). A production roastery on an industrial estate, with a flue, an oxidiser and pallet deliveries, is more likely to be general industrial in Class B2. Argue it explicitly rather than leaving it to the case officer.
Describing the roasting cycle and its emissions
Set out the plant and the process in numbers you can support.
- Roaster type and batch capacity in kilogrammes, and whether the machine is drum or fluid bed.
- Fuel, burner rating and whether the machine is direct or indirect fired.
- Roast cycle duration, and the number of consecutive batches in a normal working day.
- Cooling tray arrangement and whether cooling air is separately extracted.
- Destoner, chaff cyclone and any grinding or packing plant with its own extraction.
- Abatement, with the manufacturer's stated performance.
Then describe the emission itself: particulate, in the form of chaff and fines, and volatile organic compounds that carry the characteristic roast odour. Smoke becomes visible at darker roast profiles. Being specific about roast profile matters, because an operator roasting to a medium profile has a materially different emission to one producing espresso dark roasts all day.
State the hours. Most roasteries run production in the early morning, which is when residential receptors are most exposed and least tolerant.
Why roasting differs from cooking odour
Three differences change the assessment.
The emission is a process emission from a combustion-fired vessel, so the temperature and moisture content of the exhaust are different from a kitchen extract and the duct has to be specified accordingly. Carbon filtration alone, which does useful work on a kitchen canopy, is generally unsuitable as the primary control for roasting because the loading and the temperature will exhaust the media quickly.
The profile is cyclical rather than continuous. Peaks last minutes, which means abatement has to be sized for the peak and running before the first batch starts.
And chaff is a fire risk. Chaff collection, cyclone cleaning and duct cleaning are safety items as well as emission controls, which gives the council a legitimate interest in the maintenance regime.
Where the unit also has a cafe kitchen, that extract is a separate system with its own assessment, and the Odour Assessment approach applies to it rather than to the roaster.
Abatement options and their suitability
| Option | What it does | Where it fits |
|---|---|---|
| Cyclone | Removes chaff and coarse particulate | Always, upstream of everything else |
| Thermal oxidiser or afterburner | Destroys volatile compounds and smoke at high temperature | The usual primary control for production roasters |
| Catalytic oxidiser | Similar function at lower operating temperature | Where energy use or space rules out a thermal unit |
| Water scrubber | Particulate and some soluble compounds | Supplementary rather than primary |
| Carbon filtration | Polishing of residual odour | Downstream of oxidation, on smaller machines |
Manufacturers state the batch size above which they recommend an oxidiser, and that figure belongs in the statement with the machine specification attached. Where the proposal is for a small sample roaster in a shop unit, say so and explain why oxidation is not proposed, rather than leaving the omission unexplained.
Abatement that is switched off is abatement that does not exist. Offer an interlock so the roaster cannot run with the oxidiser below operating temperature, and offer a condition requiring it. That single commitment answers most environmental health objections.
Flue height and dispersion
The flue is usually the part that decides the application, and it is also the part that affects the building's appearance.
Specify a vertical discharge, terminating above the ridge of the host building and of anything immediately adjoining, clear of openable windows and air intakes, with no cowl or downward-facing terminal. Give the height above ground and above roof level, the internal diameter, the material and the fixing arrangement, and show it on an elevation.
Where residential windows sit close and at height, a dispersion assessment is worth commissioning rather than arguing about. An Air Quality Assessment can model the discharge and show the predicted concentrations at the nearest receptors, and councils treat that evidence seriously. Where the building is in a conservation area or is listed, the flue is a heritage question as well, and the design of the run and its colour will be scrutinised.
Noise from the extract and the roaster
Four sources, and it is worth listing them separately because applicants routinely assess only the fan.
The extract fan and the oxidiser burner. The cooling tray fan, which often runs at a higher level than the main extract. The destoner and any pneumatic conveying, which produces a tonal component. And the compressor or chiller if one serves the packing line.
Assess the combined plant against the prevailing background using the BS 4142 method, with a correction for tonality or intermittency where the character of the sound warrants it. A Noise Impact Assessment at that level of detail is normally expected where any residential property is within earshot, and the assessment should state the plant selections it assumes so that a condition can hold the applicant to them.
Hours of operation and delivery movements
Green coffee arrives in sacks or bulk bags, usually by curtain-sided lorry, and it needs a forklift or a pallet truck to get it in. Roasted coffee leaves in smaller vehicles on a more frequent cycle.
Set out the vehicle types, the daily and weekly frequency, where they will stand, and how they will manoeuvre. Then propose delivery hours that exclude the early morning where residential neighbours are close, and accept that an early production start may have to be traded against a later delivery window.
Include waste too. Chaff, sacks, packaging and spent grounds all need storage and collection, and a Waste Management Strategy covers the container sizing and the collection access where the scheme is large enough to warrant one.
Evidence to submit with the application
A workable pack for a roastery is short and specific.
- The ventilation and extraction statement itself, following the structure above.
- Machine and abatement specifications from the manufacturer, with performance data.
- A flue drawing in elevation and section, with heights and the termination detail.
- A plant noise assessment using BS 4142, listing the plant selections assumed.
- A dispersion assessment where sensitive receptors are close or at a higher level.
- A maintenance schedule covering cyclone emptying, duct cleaning and oxidiser servicing, with a retained log.
- A short statement on the use class position and, where relevant, on deliveries and hours.
Ask the council's environmental protection team early whether the operation also needs a permit under the environmental permitting regime, because some food processing activities are regulated by local authorities alongside planning, and the thresholds sit in the regulations rather than in planning policy.
A Ventilation/Extraction Statement draft gives you the section order to work from, and offering your own conditions on abatement interlock, maintenance records, flue retention and delivery hours is the single most effective thing an applicant can do here.
For specialist technical reports, qualified professional input may be required, and dispersion modelling for a roastery is one of them. This article is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Does a coffee roastery need planning permission?
Usually yes, unless the roasting is genuinely incidental to a retail use already within Class E. A production roastery with a flue, an oxidiser and pallet deliveries is likely to be general industrial in Class B2, which means an application. Settle the use class argument in the statement rather than leaving the case officer to reach their own view.
Is carbon filtration enough for a coffee roaster?
Rarely as the primary control. The exhaust from a combustion-fired roaster is hotter and more heavily loaded than a kitchen extract, so carbon media is exhausted quickly. The usual arrangement is a cyclone for chaff, then a thermal or catalytic oxidiser for volatile compounds and smoke, with carbon used only as a polishing stage on smaller machines.
How high does a roastery flue need to be?
There is no single statutory height. Specify a vertical discharge above the ridge of the host building and any immediately adjoining building, clear of openable windows and air intakes, with no cowl. Where residential windows are close or at a higher level, commission a dispersion assessment and present predicted concentrations at the nearest receptors rather than arguing from principle.
What noise sources should a roastery assessment cover?
The extract fan, the oxidiser burner, the cooling tray fan, the destoner and any pneumatic conveying, and any compressor or chiller serving packing. Assess them together against the prevailing background using the BS 4142 method, applying a correction where the sound has a tonal or intermittent character, and state the plant selections assumed so a condition can hold you to them.
What conditions should a roastery applicant offer?
An interlock preventing the roaster running with the abatement below operating temperature, a maintenance schedule with a retained log covering cyclone emptying and duct cleaning, retention of the flue at the approved height, a noise limit at the nearest residential facade, and delivery hours that exclude the early morning where neighbours are close.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.