TR19 Cleaning Frequency: Full Guide for Commercial Kitchens
If you operate a commercial kitchen in the UK, understanding the TR19 cleaning frequency for your extraction system is not just a hygiene matter. It is what your insurance policy is most likely to hold you to, and the first thing a fire risk assessor will ask to see. This guide breaks down exactly how often you must clean your ductwork and canopies, based on how intensely your kitchen runs.
What Is the TR19 Cleaning Frequency by Usage Band?
The TR19 standard, published by the Building Engineering Services Association (BESA), sets out the following cleaning intervals for commercial kitchen extraction systems:
- Kitchen usage — Typical operating hours — Cleaning frequency
- --- — --- — ---
- Heavy use — 12–16 hours per day — Every 3 months
- Moderate use — 6–12 hours per day — Every 6 months
- Light use — 2–6 hours per day — Every 12 months
Cooking style can move a kitchen up a band regardless of the clock. A charcoal grill or a fryer running flat out loads a system far faster than a kitchen doing mostly boiling and steaming, so hours are the starting point rather than the whole answer.
These bands are the benchmark your insurance policy will reference. A kitchen serving breakfast and lunch only, running five hours a day, falls into the light band. A hotel kitchen open from breakfast through to late dinner, or a busy fish-and-chip shop frying all evening, sits in the heavy band.
What Decides Which Band Your Kitchen Falls Into?
The TR19 cleaning frequency is not a one-size-fits-all tick-box. BESA bases these intervals on three practical factors:
- Hours of operation – Longer cooking hours mean more grease particles entering the ductwork.
- Type of cooking – Chargrilling, frying, and wok cooking release far more grease-laden vapour than steaming or boiling. A light-use sushi counter generates less contamination than a light-use burger joint.
- Filter efficiency and system design – Poorly maintained baffle filters allow grease to travel deeper into the duct, requiring more frequent cleans.
The honest answer is that no one else can tell you your band with certainty—your ductwork condition at inspection does. BlueTick's CII-qualified founder recommends treating the table above as your starting point, then adjusting based on what your last post-clean inspection showed.
What Happens to the Interval if Your Kitchen Changes How It Cooks?
Your TR19 cleaning frequency is a living obligation, not a fixed anniversary date. If you make any of the following changes, you must reassess your cleaning schedule immediately:
- Adding a chargrill or open-flame grill – This single change can push a moderate kitchen into the heavy category overnight.
- Extending opening hours – Moving from lunch-only to lunch-and-dinner service typically halves your required cleaning interval.
- Changing the menu – Swapping from pre-cooked items to fresh frying increases grease output substantially.
- Taking on outside catering from the same kitchen – Additional production hours change your usage calculation.
Failing to update your schedule after such changes creates a documentation gap. If an insurer later asks why you were still cleaning annually when your new chargrill pushed the kitchen to fourteen hours a day, the annual interval may not meet the policy's condition to maintain the system "in accordance with TR19 guidance."
Why TR19 Cleaning Frequency Matters for Your Insurance and Your Business
Your insurance policy almost certainly contains a condition requiring you to maintain kitchen extraction systems to the TR19 standard. This is not a recommendation; it is a contractual obligation. If a fire occurs and the insurer asks for your cleaning records, you must be able to produce:
- A dated cleaning certificate issued after each clean
- A report showing pre- and post-clean grease readings
- A breakdown of which duct sections were cleaned
- Photographic evidence of the ductwork condition
BlueTick supplies all of this documentation after every service. Without it, you face the practical problem of proving compliance. The law under the Insurance Act 2015 focuses on whether a breach could have increased the risk of the actual loss—so a missed clean during a quiet period may not affect a claim, but a history of ignoring TR19 intervals after heavy-use changes could be a different matter. We are not insurance advisers, and we will not predict outcomes. What we will say is this: the policy condition requires documented TR19 compliance, and the only way to satisfy that condition is to clean at the right frequency and keep the paperwork.
How BlueTick Can Help You Stay Compliant
BlueTick Extraction Hygiene, based in Peterborough, provides TR19-compliant cleaning across the East Midlands and beyond. We clean the full system—canopy, filters, and ductwork—and issue compliance certificates that satisfy insurance documentation requirements. Our principal surveyor holds the BESA Academy Grease Hygiene Technician (GHT3) and Grease Hygiene Operative (GHO3) qualifications, and the CII Level 3 Certificate in Insurance. The cleaning is done to the standard, and the paperwork is written with your underwriter in mind.
We do not guess your cleaning band during a phone call. We visit your kitchen, assess your cooking methods, equipment, and hours, then recommend a schedule that matches your actual operation. If you cannot remember when your last clean happened, or if you have changed your menu recently, we can help you get back on a defensible schedule.
Contact BlueTick today for a free site survey. We will review your extraction system, confirm your required TR19 cleaning frequency, and provide a no-obligation quote. Call us or complete the enquiry form on this page—your insurance paperwork and your fire safety will thank you.