Hertfordshire · TR19 inspections and grease testing
TR19 inspections in Letchmore Heath
TR19 inspections, grease thickness testing, pre-clean surveys and post-clean verification for commercial sites in Letchmore Heath and across Hertfordshire. CHAS, SafeContractor and ISO 9001, and fully insured.
- An insurer’s request for a TR19 audit
- Heavy grease suspected in the plenum or ducts
- Checking the result of a recent clean
About our TR19 inspection in Letchmore Heath
Grease thickness testing tells you how much grease is sitting in the canopy, ducts and fan. We use the Wet Film Thickness Test (WFTT) or the Deposit Thickness Test (DTT), taking readings at set points. The results show whether the system needs cleaning and how soon. Common call-outs are for missing access panels found on survey and checking the result of a recent clean, on deposit thickness tests, post-clean checks and access surveys.
In a small place like Letchmore Heath, kitchens are often in older or extended buildings, with long single-storey duct runs, and those horizontal sections are where grease settles. Access, parking and timings are agreed before the day.
We are CHAS and SafeContractor accredited, we hold ISO 9001 and we’re fully insured. We are also a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, trading since 2009.
- Where
- Letchmore Heath (WD25, WD6)
- Wider area
- Hertfordshire
- Paperwork
- TR19® certificate and photo report
- Price
- A fixed quote up front
- When we work
- Out of hours as standard, 24/7 emergency line
- Call
- 0345 646 2711
- Checked
- 30 October 2026
What TR19 inspection looks like in Letchmore Heath
The FSA’s food hygiene register includes about 7 pubs and bars and about 3 hotels and B&Bs in Letchmore Heath and the streets around it, up to about 1.5 miles out. Any of them serving cooked food has an extract to keep clean, from canopy to discharge. Letchmore Heath sits within the area of Hertfordshire Fire and Rescue Service. Grease in a kitchen extract is a recognised fire risk, and the fire authority enforces the law on managing it in most commercial premises. Food hygiene inspections in Letchmore Heath are the job of Hertsmere council’s environmental health team. The cleanliness of the kitchen and its equipment, extraction included, is part of what they check. Keeping each certificate and photo report on file helps show the extract is looked after.
Term dates shape school work: for a school like Fair Field Junior School, an extract clean fits neatly into a half-term or summer break. A hall kitchen that only cooks for events, whether near Church of St John the Baptist or elsewhere in Letchmore Heath, still needs its extract cleaned, just less often. Healthcare kitchens, like those at hospitals such as Shenley Hospital (about 2.6 miles north-east), often cook for long hours, which puts them in BESA’s heavier-use bands.
Letchmore Heath is about 2 miles north-east of Bushey, in Hertfordshire. For TR19 inspection in and around Letchmore Heath, please call 0345 646 2711 or drop us a line for a fixed quote. We work across South East England and London, including Letchmore Heath. Letchmore Heath is one of 381 places in Hertfordshire we cover for TR19 inspection. For sites nearby, see our London page, about 16 miles away.
Here we cover the WD25 and WD6 postcode area for TR19 inspection. If you need TR19 inspection at premises on Back Lane, The Green and New Road or anywhere close by, we can help. We also cover the places around Letchmore Heath: Round Bush (1 mile north-west), Patchetts Green (1 mile west), Kemprow (1 mile north), Aldenham (1 mile north-west) and Radlett (1 mile north-east). Within a short drive, we also cover Watford (3 miles west), Hemel Hempstead (8 miles north-west), St Albans (6 miles north), Welwyn Garden City (11 miles north-east), Harpenden (10 miles north) and Hoddesdon (15 miles north-east).
Landmarks near Letchmore Heath
Locally, jobs take us to businesses close to Bushey Meads School, Aldenham Country Park and Three Horseshoes Public House and the streets around them. For rail, the closest station is Radlett station, about 1.5 miles north-east. Other landmarks nearby include Radlett and District Museum (1.3 miles north-east) and Harlequin Centre (2.7 miles west). Not far away are Stanmore Common.
Why it’s worth doing now in Letchmore Heath
Sites in Letchmore Heath that have never measured grease can’t tell whether their cleaning interval suits the kitchen. Testing gives you the evidence to set it properly. Out of sight is the usual reason a rural system goes too long without attention.
Combining work into one visit or one programme often makes better use of the time. Mention every system or site you need covered, and you’ll get one fixed quote.
Why choose Duct Doctor in Letchmore Heath
- Fixed quotes from a survey or pictures
- A BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- One number for every site across the South East and London
- Out-of-hours work and a 24/7 emergency line
Read our cost guide or our accreditations.
What TR19 inspection cannot fix
We’d rather tell you now than book work that won’t help, so here are the limits:
- The responsible person’s own fire risk assessment
- Fan breakdowns, which need a repair visit
- Hidden runs that need access panels first
Not sure which it is? You can phone us on 0345 646 2711 or drop us a line and we’ll tell you honestly.
What the work covers
- Pre-clean surveys
- Wet film thickness tests
- Access surveys
- Deposit thickness tests
- Post-clean checks
- Insurer audits
Common questions in Letchmore Heath
Do you work overnight in Letchmore Heath?
Yes, we can come after you close and finish before you open. The site is handed back ready to open. Let us know the hours you’re closed and we will book within them.
Will you come out to Letchmore Heath?
Yes. Villages and rural sites across the South East are part of our work, Letchmore Heath included. The journey is planned ahead, so a few details about the route help.
How do you measure grease in a kitchen extract?
It’s a measurement of how much grease is coating the inside of the extract, by WFTT or DTT. The results are given in microns.
What do you do with what you remove?
Anything we remove is contained as we work and taken away with us, from grease and debris to used cleaning water. We do not leave it behind.
How much does TR19 inspection cost in Letchmore Heath?
Every site is different, so each gets its own fixed quote. For a quote, ring 0345 646 2711 or email us and tell us about the site and its opening hours.
Can you verify a clean after it’s been done?
A post-clean check records grease readings and pictures after the work, whoever did the clean.
What do the grease readings need to be?
TR19® Grease says the mean shouldn’t exceed 200 microns between cleans, with 500 microns or more anywhere needing immediate spot cleaning.
What does TR19 mean?
TR19® is BESA’s specification for ventilation hygiene. Since 2019, TR19® Grease has been a standalone specification for grease in kitchen extract systems, and TR19® Air covers general supply and extract systems.
What your team can do, and what needs us
If your staff spot something between visits, like drips, unusual noise, smells or damaged filters, they should report it rather than try to fix it. We can diagnose it and quote.
Logging matters as much as cleaning. A simple log of filter washes, wipe-downs and checks helps show that the system is managed between specialist visits, alongside our reports.
The process
The visit has three parts: getting the area ready, doing the work and signing it off. Set-up means sheeting and making equipment safe, while signing off means the written report and pictures. The middle part takes longest, and that takes anything from an hour for a small canopy and short duct to a good part of a day for a large site. For a village or hamlet like Letchmore Heath, tell us about narrow lanes, gates and parking when you book.
- First we look at the system’s cleaning history, if there is one.
- We follow the extract from canopy to discharge.
- Access panels are located and any missing ones noted.
- We measure the grease and photograph each point.
- You get a report and a fixed quote for the clean.
Preparing for the visit
- Tell us the best time to work, such as after service or at a weekend
- Make sure someone can let us in and lock up afterwards
- Tell us about site rules, permits or sign-in
Ask for a quote
For TR19 inspection in Letchmore Heath, call us on 0345 646 2711 or use the quote form. Let us know the site type and the opening hours, and send pictures or your last report if you can. A fixed quote typically follows within one working day.
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Fixed quotes for TR19 inspection in Letchmore Heath
We quote each job individually. These are the things that affect it:
- Working hours and out-of-hours timing
- A single visit or a regular plan
- The size of the system
- How many systems or sites are involved
When the work has to happen, how we reach it and how big the site is can all change the price. We take each of them into account and give you a fixed price before we start.
Helping us quote
Many jobs can be priced from photos and some basics. Useful things to send:
- When the site is open and when it’s quiet
- Any symptoms, from odd noises to smells or leaks
- Your last certificate, test record or report
- How we’d reach plant on a roof or in a plant room
There’s no standard price list, because every site is different. Instead, we look at your site first, from photos or a survey, then send a fixed quote. To get going, call 0345 646 2711 or send us an email.
Keeping the system healthy
A little care between visits keeps the system in better shape. We recommend:
- Keep TR19 certificates, readings and reports together
- Report grease dripping from the canopy
- Send TR19 audit reports to your insurer on request
- Book the next test on the date in the report
Each report suggests the next clean and the next test, from the measured grease and the kitchen’s hours.
Clean, correctly fitted filters stop more grease reaching the duct. Gaps around filters let grease get past them.
Different parts, different methods
Horizontal duct runs
Sections without access are recorded so panels can be added.
Canopy and plenum
Clean-looking filters do not mean a clean plenum. So we measure behind the filters, not just in front.