Hertfordshire · TR19 inspections and grease testing
TR19 inspections and grease testing in Thorley Street, Hertfordshire
TR19 inspection for Thorley Street, from a team that has been trading since 2009. Out-of-hours visits and 24/7 emergency callout.
- Insurers asking for TR19 evidence
- Surveys needed before quoting a full clean
- Sites with gaps in their extract records
In-house cleaning or a specialist?
Staff cleaning and specialist work are not the same thing. A daily filter wipe and a weekly filter wash keep grease down at the front of the system, but grease that has passed the filters is out of reach. That part needs specialist access and equipment.
Away from the kitchen, the in-house job is mainly checking: keeping grilles clear, noting unusual noise or smells and logging filter changes. The inside of ducts and units needs a specialist.
TR19 inspection in Thorley Street
Under TR19® Grease, the mean grease thickness should stay at or below 200 microns between cleans, while a reading of 500 microns or more anywhere calls for immediate spot cleaning. Testing is how you know where your system stands. Common call-outs are for uncertainty over how often to clean and sites with gaps in their extract records, across access surveys, pre-clean surveys and deposit thickness tests.
For a kitchen in or near Thorley Street, the visit is planned around opening hours and the journey, and the clean itself is the same full TR19® job as in any town: canopy, filters, duct, fan and discharge, with a certificate and photo report at the end.
Insurers, fire officers and environmental health officers all look at records. So every job comes with a written report and photos, plus a TR19® certificate through the BESCA VHE portal where the work is a TR19® Grease clean.
- Place
- Thorley Street (CM23)
- Region
- Hertfordshire
- Paperwork
- Certificate plus before-and-after pictures
- Quote
- A fixed quote up front
- Hours
- Overnight and weekend work, 24/7 emergency callout
- Telephone
- 0345 646 2711
- Updated
- 30 October 2026
Why deal with it now?
Finding a hotspot early means a targeted spot clean rather than a bigger problem later. Left alone, grease keeps building between cleans. With notice, the visit to Thorley Street can be fitted around your bookings and events.
Whatever the type of site, the quote works the same way: how much there is, how we reach it, what state it’s in and when we can work. Call for a fixed quote and we’ll explain each part.
Why Thorley Street businesses choose us
- Ventilation hygiene specialists since 2009
- Fully insured
- CHAS, SafeContractor and ISO 9001
- One number for every site across the South East and London
Read how cleaning jobs are priced or our accreditations and certificates.
TR19 inspection around Thorley Street
Look up Thorley Street on the FSA’s food hygiene register and you will find about 86 restaurants, cafés and works canteens and about 29 takeaways within about 1.5 miles of central Thorley Street. Each kitchen extract among them can be measured for grease to set the right cleaning interval. In Thorley Street, food businesses are inspected by environmental health officers from East Hertfordshire council. The cleanliness of the kitchen and its equipment, extraction included, is part of what they check. Before-and-after photos from each clean are a simple way to show the extract is in hand. Thorley Street is covered by Hertfordshire Fire and Rescue Service. Fire and rescue authorities enforce the Fire Safety Order in most non-domestic premises, and in a kitchen that fire risk includes the grease in the extract.
If you look after a school kitchen, at a school such as Thorley Hill Primary School or anywhere near Thorley Street, the holidays are the usual time for a TR19® clean. Much Hadham Palace, about 3.6 miles west, is one of the historic houses near Thorley Street; if you run event catering at a venue like that, cleans can be booked between functions.
Thorley Street is about 1 mile south of Bishop's Stortford, in Hertfordshire. Whatever kind of site you run in Thorley Street, TR19 inspection is something we can help with. Visits can be booked for evenings, overnight or weekends so trading isn’t interrupted. 381 places in Hertfordshire are on our list, large and small. Chelmsford is in our area too, around 16 miles away.
Work in CM23 follows the same survey, fixed quote and written report as everywhere else we cover. Neighbouring places we cover for TR19 inspection include Thorley (1 mile west), Spellbrook (1 mile south), Little Hallingbury (1 mile south-east), Bishop's Stortford (1 mile north) and Gaston Green (1 mile south-east). Further out, we also cover Stevenage (15 miles west), Hoddesdon (10 miles south-west), Cheshunt (13 miles south-west), Hertford (11 miles west), Ware (8 miles west) and Broxbourne (10 miles south-west).
Near you in Thorley Street
In Thorley Street, that means kitchens and buildings near Coach And Horses Public House and The Bishop's Stortford High School and the streets around them. The closest station to Thorley Street is Bishops Stortford station, about 1.2 miles north of the centre. A little further out are Moated mound (3.4 miles north-west) and Herts and Essex Hospital (1.3 miles north-east). Open spaces near Thorley Street include Thorley Wash nature reserve and Portingbury Hills.
FAQs for Thorley Street
Can you come to Thorley Street after we close?
Yes, evening, overnight and weekend work is normal for us. Your customers, staff or residents in Thorley Street needn’t be disturbed. When you ring 0345 646 2711 or send us an email, mention when the site is quiet.
Which fire and rescue service is responsible for Thorley Street?
It’s Hertfordshire Fire and Rescue Service, which covers Thorley Street. A recent cleaning certificate and a note of the next clean date show that grease in the extract is being managed.
Are you accredited?
Duct Doctor is a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. We also hold CHAS, SafeContractor and ISO 9001, and we carry full insurance.
How often should a kitchen extract be inspected?
Each report recommends when to test and clean next, taking the readings and the kitchen’s hours into account. A risk assessment based on measured grease should set the interval.
What happens if you can’t reach some of it?
The report shows them clearly. Often the fix is extra access, such as new panels in ductwork, which we can install.
Can you inspect our extract for our insurance company?
Yes, anywhere in the area we cover. Tell us what your insurer has asked for and we’ll set the report out to match.
Can we book visits on a schedule?
Yes, of course. Send details of the systems and how they’re used and we will propose a schedule with a fixed quote.
Where does the waste go?
It leaves the site with us at the end of the visit. During the work, it’s contained so the area stays clean.
Nearby places to Thorley Street
What else we do in Thorley Street
How the visit works
Your trading hours come first. We book the visit for a time the area is closed, whether that is an evening, overnight or a weekend. When the team arrives, the work area is protected and the relevant equipment is switched off to cool, and the work takes a couple of hours for a typical kitchen extract system. If you can send pictures, we can arrive in Thorley Street knowing what to expect.
- We agree a time when the kitchen is closed or quiet.
- Every part of the system is examined, end to end.
- We take WFTT or DTT readings at set points along the system.
- Each test point and any access problems are photographed.
- You get a report with readings, pictures and recommendations.
Preparing for the visit
- Clear loose items from the work area
- Mention any locked doors, roof access or ceiling voids
- Let us know about permits to work or site inductions
Get a fixed quote
Quoting starts with a diagnosis, from your photos and details or, where that is not enough, a survey on site. After that, you get a fixed price for the work so you know the cost before work begins.
Read more
How the job changes from site to site
Canopy and plenum
The canopy itself is checked inside and out, and note where grease has gathered.
Vertical risers
Vertical risers take the extract up through the floors. Grease can run down and collect at the base, so we check there.
Signs you need TR19 inspection in Thorley Street
Not every section of a kitchen extract is easy to get to, so those sections can be skipped time and again. An inspection of a system in Thorley Street shows where access panels are missing, so the gaps can be closed.
What we are most often called out for:
- Systems cleaned on a calendar with no measurements
- Pre-clean surveys before a first TR19 clean
- Missing access panels found on survey
- Missing TR19 certificates or history
Healthcare kitchens, like those at hospitals such as Herts and Essex Hospital (about 1.3 miles north-east), often cook for long hours, which puts them in BESA’s heavier-use bands.
Questions to ask before you book
- Whether the work can be done while the site is closed
- Whether inaccessible sections are listed on the report
- If the quote is a fixed price or an estimate
- If they look at the system before pricing
When something else is needed
We’d rather tell you now than book work that won’t help, so these are the things it won’t cover:
- The responsible person’s own fire risk assessment
- Mechanical faults in the extract
- Installation problems, which fall under design guidance such as DW172
If in doubt, phone us on 0345 646 2711 or drop us a line and we will say what we think.
Parts of the system we cover
- Post-clean checks
- Access surveys
- Insurer audits
- Pre-clean surveys
- Wet film thickness tests
- Deposit thickness tests
What affects the cost of TR19 inspection
We don’t publish a price list, because no two systems are the same. The quote depends on:
- The scale of the work
- Site rules, permits and inductions
- The number of sites or systems
- Working hours and out-of-hours timing
Leaving it longer rarely makes the work cheaper. Build-up, wear and faults tend to get worse, not better, which can make the next visit longer. If you’re unsure, call 0345 646 2711 or send us an email for straight advice and a fixed quote.
What to send for a quote
To speed up the quote, send us:
- When the site is open and when it’s quiet
- The roof, plant room or outside wall the system runs to
- The paperwork from the last visit, if you have it
- A few general shots of the system
Photos are enough for some jobs, while others need a look on site. Larger sites, and anything hidden behind walls, ceilings or floors, are normally surveyed first. Either way, you get a fixed price before work begins.