Greater London · TR19 inspections and grease testing
Underhill TR19 inspection
Professional TR19 inspection in and around Underhill, booked around your opening hours and signed off in writing with pictures.
- Parts of the system left out of past cleans
- Insurance renewals needing proof of TR19 cleaning
- Extracts that have never been grease tested
About our TR19 inspection in Underhill
If you’ve taken over a kitchen in Underhill and do not know when the extract was last cleaned, an inspection is the place to start. We survey the system, measure the grease and tell you what needs doing, before any cleaning is booked. The work covers insurer audits, access surveys and wet film thickness tests, and the jobs we see most are parts of the system left out of past cleans and checking the result of a recent clean.
London kitchens tend to trade late and open early, so extract cleaning in Underhill is normally done overnight, after the last service. Before the clean, we agree loading, parking and roof access with whoever manages the building.
We’re CHAS and SafeContractor accredited, we hold ISO 9001 and we are fully insured. We are also a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, trading since 2009.
- Place
- Underhill (EN5, N20)
- Region
- Greater London
- Records
- TR19® certificate and photo report
- Quotes
- A fixed quote up front
- Working hours
- Nights, weekends or holidays to suit you
- Phone
- 0345 646 2711
- Reviewed
- 30 October 2026
When it’s something else
A few issues sit outside what this work can do:
- Heavy deposits found on test, which still need cleaning
- The responsible person’s own fire risk assessment
- Ductwork that was designed or installed badly
If you are not sure, just call 0345 646 2711, or send details by email and we will give you a straight answer.
Parts of the system we cover
- Wet film thickness tests
- Post-clean checks
- Insurer audits
- Pre-clean surveys
- Deposit thickness tests
- Access surveys
How we price TR19 inspection
The price is fixed before any work begins. It takes into account:
- The size of the system
- Travel, parking and unloading
- How easy every part is to reach
- The number of sites or systems
We don’t list prices on the website, because the cost depends on the site in front of us. Call for a fixed quote, and we will talk you through it.
Asking for a quote
Photos let us diagnose from a distance. The most useful are:
- The times we could work without disrupting the site
- The roof, plant room or outside wall the system runs to
- Wide pictures of the system and the area around it
- Any previous report or certificate
Every quote begins with a look at the system, either from photos and details you send or from a site visit. Then we send a fixed price, before work begins.
Also near Underhill
What else we do in Underhill
Staff cleaning versus specialist work
A few tasks are always specialist work: opening up ductwork, cleaning fans, drop testing fire dampers and measuring grease need training, the right equipment and safe access. That’s our job.
Logging matters as much as cleaning. A dated log of in-house cleaning and checks shows an inspector that the system is looked after between visits, alongside our reports.
Leave it or put it right?
Skipping grease testing leaves the cleaning interval to guesswork. Any reading of 500 microns or more needs immediate spot cleaning under TR19® Grease, and you can only act on that if you’ve measured it. In a London building, a problem in a duct, damper or fan rarely stays in one unit.
Leaving it longer rarely makes the work cheaper. Problems in a system tend to grow, and a neglected system can mean more work. If you’re unsure, phone us on 0345 646 2711 or email us and we’ll give you an honest view and a fixed quote.
Why choose Duct Doctor in Underhill
- Trading since 2009
- A BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- A fixed price before any work starts
- We diagnose before we treat
Read how cleaning jobs are priced or how to check a contractor.
What TR19 inspection looks like in Underhill
According to Food Standards Agency records, there are about 30 pubs and bars within roughly a mile and a half of the centre of Underhill. Any of them serving cooked food has an extract to keep clean, from canopy to discharge. Overnight is the normal time to clean a London kitchen extract, so trading isn’t affected. The fire and rescue service for Underhill is London Fire Brigade. Grease in a kitchen extract is a recognised fire risk, and the fire authority enforces the law on managing it in most commercial premises.
Historic houses near Underhill, such as Wyllyotts Manor about 3.4 miles north, are a reminder that older buildings with event kitchens can have long, awkward duct routes. School kitchens, at schools like St Catherine's RC School for example, are typically cleaned in the holidays so no lunches are lost.
Underhill is about 1 mile west of Barnet, in Greater London. Across the EN5 area, we cover TR19 inspection for commercial sites. Underhill is one of 764 places in Greater London we cover for commercial clients. Our London page covers sites nearby (11 miles or so).
Here we cover the EN5 and N20 postcode area for TR19 inspection. Streets in the area include Park Road, May's Lane and Manor Road, all of which we cover for TR19 inspection. We also cover the places around Underhill: Barnet (1 mile east), New Barnet (1 mile east), Monken Hadley (1 mile north), Hadley Wood (1 mile north-east) and Cockfosters (2 miles east). We also work in nearby towns such as London (11 miles south-east), City of Westminster (9 miles south), Marylebone (9 miles south), Kensington (10 miles south), St Pancras (9 miles south) and Shoreditch (10 miles south-east).
Near you in Underhill
Locally, jobs take us to businesses close to Susi Earnshaw Theatre School, Highlands Gardens and The Red Lion pub. The nearest railway station is New Barnet station, roughly 1 mile east. Other landmarks nearby include Francis Skaryna Belarusian Library and Museum (2.2 miles south) and Barnet General Hospital (0.9 miles west). For a walk, there’s Greenhill Gardens and Darland's Lake.
FAQs for Underhill
Can parking be tricky for a job in Underhill?
We plan it in advance, so let us know about loading bays, permits and access rules at the building. Much of our London work is done overnight, which helps.
Can a school canteen extract in Underhill be done out of term time?
Yes, and it’s the easiest time to do it. Food Standards Agency records list about 30 schools, colleges and universities with registered kitchens within about a mile and a half of Underhill. Booking early in the term gives the best choice of holiday dates.
Can the work be done while we are closed?
Yes. Much of our work happens in the evening, overnight or at weekends, so the site doesn’t lose a service.
What should I send you?
Where the site is, what it is and when it’s open, plus pictures of the system and your last certificate or report if you have one.
How much time does an inspection need?
Expect it to take around an hour or two per canopy and duct system. The visit is timed so cooking isn’t disrupted.
Are you accredited?
CHAS, SafeContractor, ISO 9001 and BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease. We are fully insured and have been trading since 2009.
What is a WFTT or DTT grease test?
Grease thickness testing measures the layer of grease on the duct surfaces, using the Wet Film Thickness Test (WFTT) or Deposit Thickness Test (DTT). Each reading is recorded in microns.
How much notice do you need?
The more notice, the better, particularly for night and weekend visits. We usually quote within one working day, and emergencies are covered by our 24/7 line.
How the job changes from site to site
Extract fan and discharge
A greasy fan works harder and wears faster. Readings show if it needs attention before the next clean.
Restaurants, pubs and hotels
Inspections are done when the kitchen is closed or quiet so the kitchen keeps cooking.
Do you need TR19 inspection in Underhill?
You can’t judge grease thickness by eye. A system can look clean at the filters and be heavily coated further in, so readings are the reliable guide.
The symptoms we are asked about most include:
- Extracts that may be over the 200 micron mean
- Cleaning intervals that may not suit the kitchen
- Surveys needed before quoting a full clean
- Systems cleaned on a calendar with no measurements
Church and community hall kitchens, near St John the Baptist Church or anywhere around Underhill, are easy to forget, but their extracts collect grease like any other.
What your quote should include
- How VAT is shown on the quote
- What records you’ll receive afterwards
- When they can work, and whether that’s outside your opening hours
- Their accreditations, such as BESCA Vent Hygiene Elite, CHAS or SafeContractor
How it works
There’s very little for your team to do on the day. Someone lets us in at the agreed time and shows us where everything is, and the rest is down to us. Afterwards, the area is left tidy and the written report follows. In a London area like Underhill, parking, loading and building access are planned before the day of the work.
- 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.
- Grease readings are taken and pictures recorded.
- You get a report and a fixed quote for the clean.
Preparing for the visit
- Mention any sign-in, permit or induction we need
- Allow time for equipment near the work to be turned off and cool down
- Make sure someone can let us in and lock up afterwards
How to get a quote
Photos are the quickest way to a quote: wide shots of the system, close-ups of anything that worries you and how we’d get to it. Tell us what kind of site it is and when it’s open, and many jobs can be priced from that alone.