Hertfordshire · TR19 inspections and grease testing

Friar's Wash TR19 inspection

Specialist TR19 inspection for Friar's Wash: diagnosis first, then a fixed quote, the work and a report with photos. Call for a fixed quote.

  • Uncertainty over how often to clean
  • Heavy grease suspected in the plenum or ducts
  • Surveys needed before quoting a full clean

TR19 inspection in Friar's Wash

About our TR19 inspection in Friar's Wash

Under TR19® Grease, the mean grease thickness should stay at or below 200 microns between cleans, and 500 microns or more at any point needs immediate spot cleaning. Grease testing shows which side of those lines you’re on. Common call-outs are for systems cleaned on a calendar with no measurements and surveys needed before quoting a full clean, on access surveys, wet film thickness tests and pre-clean surveys.

Work in a small place like Friar's Wash starts with a call to agree access and timings, 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.

The paperwork matters as much as the work. Each visit is written up with pictures, covering the work done, any areas we couldn’t access and a recommended next date. File it in your maintenance log so it’s to hand when an insurer or inspector asks.

Where
Friar's Wash (AL3)
Wider area
Hertfordshire
Records
Certificate plus before-and-after photos
Quote
Fixed quote, typically within a working day
Working hours
When your site is closed, plus a 24/7 line
Phone
0345 646 2711
Reviewed
30 October 2026
The Duct Doctor team standing beside their branded white and blue vans

Landlords, agents and facilities managers

Records are where multi-site compliance often slips. Each visit produces a dated report with pictures, so you can show an insurer or inspector what was done at each site.

We regularly work with managing agents. Tell us the site, the work and the access arrangements and we’ll come back with a fixed quote.

When to call us in Friar's Wash

Grease in a duct is flammable fuel. Flames from the range can be pulled into the canopy and travel through the ducts to other parts of the building. Measuring it is the first step to keeping it under control.

Most sites get in touch after spotting something like this:

  • Ductwork where grease may be over the TR19 limits
  • Extracts that have never been grease tested
  • Sites with gaps in their extract records
  • Confirming a clean reached the whole system

Term dates shape school work: for a school like Flamstead Village School, an extract clean fits neatly into a half-term or summer break.

Before booking anyone

  • Whether they’re fully insured
  • Exactly which parts of the system are covered
  • Whether a survey comes first
  • Whether the work can be done while the site is closed

Our hiring checklist

Between visits

After the visit, a few habits help the work last:

  • Have the latest report ready for insurance renewals
  • Keep canopy edges and gutters wiped down
  • Keep to the recommended interval
  • Flag oily drips near the extract

Each report suggests the next clean and the next test, from the measured grease and the kitchen’s hours.

When cooking hours or the menu change, check the interval still fits. Fresh readings show whether it needs to change.

Common questions in Friar's Wash

Do you cover smaller places like Friar's Wash?

Yes, Friar's Wash is part of our area, however small the site. A survey first, from pictures or a visit, means we arrive with the right kit.

Do you work at weekends in Friar's Wash?

Yes, we can come after you close and finish before you open. The work in Friar's Wash can fit around your hours. Tell us your opening hours when you ask for a quote.

How far ahead should we book?

The more notice, the better, particularly for night and weekend visits. Quotes typically come back within one working day, and there’s a 24/7 line for emergencies.

How much time does an inspection need?

It takes an hour or two for a single kitchen, longer for a large or complex system. We fit it around when the kitchen is closed or quiet.

Will you produce a report for our insurer?

Yes. Our TR19 audits cover readings, pictures, access and a recommended cleaning interval. It’s set out for your insurer or broker.

What is post-clean verification?

It’s an inspection after cleaning, to show what state the system was left in, whoever did the clean.

When should we have our next grease test?

We suggest a next test date in every report, taking the readings and the kitchen’s hours into account. A risk assessment based on measured grease should set the interval.

What is grease thickness testing?

We measure the grease at set points with a WFTT or DTT test, and set against the TR19® Grease figures.

TR19 inspection in Friar's Wash: the local picture

The FSA’s food hygiene register includes about 4 bars, pubs and nightclubs in and around Friar's Wash, up to about a mile and a half out. Where they serve hot food, their kitchen extracts need cleaning to TR19® like any restaurant’s. Hertfordshire Fire and Rescue Service covers Friar's Wash. 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. In Friar's Wash, food businesses are inspected by environmental health officers from Dacorum council. The cleanliness of the kitchen and its equipment, extraction included, is part of what they check. A TR19® certificate and photo report after each clean gives you a record to show an inspector.

Healthcare kitchens, like those at hospitals such as Luton and Dunstable University Hospital (about 5.2 miles north-west), often cook for long hours, which puts them in BESA’s heavier-use bands. Childwickbury Manor, about 4.5 miles south-east, is one of the historic houses near Friar's Wash; if you run event catering at a venue like that, cleans can be booked between functions.

Friar's Wash is about 3 miles west of Harpenden, in Hertfordshire. We provide TR19 inspection for commercial premises of every kind in Friar's Wash and the rest of Hertfordshire. Friar's Wash is one of 381 places in Hertfordshire where we work for TR19 inspection. There’s also a page for Milton Keynes, about 21 miles away.

Our technicians cover all of the AL3 postcode area for TR19 inspection and the streets around it. Whether your site is on London Road, Chequers Hill and Old Watling Street or anywhere close by, our technicians can take on the work. Nearby, we also carry out TR19 inspection in Flamstead (1 mile south-west), Trowley Bottom (1 mile south-west) and Markyate (2 miles north-west). Larger places within reach include Watford (11 miles south), Hemel Hempstead (5 miles south), Stevenage (12 miles north-east), St Albans (7 miles south-east), Welwyn Garden City (10 miles east) and Harpenden (3 miles east).

Around Friar's Wash

We work in commercial kitchens and buildings around Chequers pub and Roundwood Park School, among other places. Friar's Wash’s nearest station is Harpenden station, roughly 3.2 miles east. A little further out are Luton Castle (3.5 miles north) and Redbourn Museum (2.3 miles south-east). Not far away are Landpark Wood.

Map of Friar's Wash © OpenStreetMap contributors

The process

We turn up at the time agreed with you, often in the evening, overnight or at the weekend so the site keeps working. Equipment that has to be off is switched off and allowed to cool first, and the area around the work is covered and protected. The work itself takes an hour or two for a single kitchen, longer for a large or complex system. Seeing the system in photos first means the trip to Friar's Wash can be planned properly.

  1. Post-clean verification is booked once the clean is done.
  2. We open the access points used on the clean.
  3. We repeat the WFTT or DTT readings.
  4. Photos are taken to show the condition after the clean.
  5. The results are reported, with anything missed flagged.

Preparing for the visit

  • Dig out any earlier paperwork for the system
  • Mention any parking or loading restrictions
  • Tell us about access, such as roof hatches, plant rooms, ceilings or locked areas

Ask for a quote

Every quote begins with a look at the system, 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, before any work starts.

Ask for a quote

Related advice

Part by part

Restaurants, pubs and hotels

A kitchen running from breakfast to late service builds grease quickly. Readings show if the cleans are frequent enough.

Extract fan and discharge

Grease on the fan adds to wear. Readings show if it needs attention before the next clean.

What your team can do, and what needs us

Keep a record of what your team does. A simple log of filter washes, wipe-downs and checks helps show that the system is managed between specialist visits, alongside our reports.

Day-to-day cleaning is something your team can do: wiping canopies, washing grease filters and recording it in a log. Inside the ducts, risers and fan is specialist work, which is where we come in.

Why act early in Friar's Wash

A check after cleaning shows whether the work reached every part it should have, before the next clean is due. If the system at a site near Friar's Wash fails, there may be nowhere nearby to move to.

Working hours, access and the scale of the site can all change the price. Each of those is built into the quote and give you a fixed price before any work starts.

Why Friar's Wash businesses choose us

  • Survey first, then a fixed quote
  • Evenings, overnight and weekends, plus 24/7 emergency callout
  • One number for every site across the South East and London
  • A BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease

Take a look at what affects the cost and our accreditations and certificates.

BESCA Vent Hygiene EliteMember, cleaning to BESA TR19® Grease
CHAS · SafeContractorISO 9001 and fully insured
Certificate and photo reportWith every clean
24/7 emergency calloutEvenings, nights and weekends
Since 2009South East England and London