Greater London · TR19 inspections and grease testing
TR19 Inspection in Derry Downs
Specialist TR19 inspection for Derry Downs: diagnosis first, then a fixed quote, the work and a report with photos. Call for a fixed quote.
- Kitchen extract systems with no recent grease readings
- Surveys needed before quoting a full clean
- Insurers asking for TR19 evidence
TR19 inspection in Derry Downs, done properly
A grease test measures how thick the grease is inside a kitchen extract system. We use the Wet Film Thickness Test (WFTT) or the Deposit Thickness Test (DTT), taking readings at set points. From the numbers, you can see whether cleaning is due. Typical jobs include insurers asking for TR19 evidence and pre-clean surveys before a first TR19 clean, across post-clean checks, access surveys and insurer audits.
Across London, many commercial kitchens are squeezed into basements and narrow back-of-house spaces, with extract ducts that can climb several floors to discharge at roof level. In Derry Downs, as elsewhere in the capital, a long duct run means more access points to open and more grease to remove.
Each visit ends with a written report and pictures, so there’s a dated record of the work. Kitchen extract cleaning to TR19® Grease is certificated through the BESCA Vent Hygiene Elite portal.
- Location
- Derry Downs (BR5, BR6)
- Region
- Greater London
- Reporting
- Certificate plus before-and-after photos
- Quote
- Fixed quote, usually within a working day
- Hours
- When your site is closed, plus a 24/7 line
- Call
- 0345 646 2711
- Updated
- 30 October 2026
What happens on the day
Your staff don’t need to do much 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. Night and weekend working is normal for us in London, and a site in Derry Downs is no exception.
- After the clean, we arrange a time to check the system.
- We open the access points used on the clean.
- Grease readings are taken again at set points.
- Photos are taken to show the condition after the clean.
- We report the findings and flag any areas that need more work.
Before we arrive
- Tell us where we can park and unload
- Name a contact who can let us in at the agreed time
- Have your last certificate or report to hand
Get a fixed quote
Want a quote for TR19 inspection? Please ring 0345 646 2711 or send us an email with a few details about the site. We will talk you through the work and give you a fixed quote before anything is booked.
Related advice
What the work involves, part by part
Horizontal duct runs
If a run has no access panel, we note it so panels can be added.
Extract fan and discharge
A greasy fan works harder and wears faster. The inspection shows whether it needs cleaning now.
Why deal with it now?
An EHO visit, an insurance renewal or a fire risk assessment is a bad time to find your extract records are thin. A recent inspection report means you’re ready when asked. Planning ahead in Derry Downs lets you pick a quiet night rather than lose a busy one.
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 we start.
Why choose Duct Doctor in Derry Downs
- A BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
- Fully insured
- Accredited under CHAS and SafeContractor, with ISO 9001
- Photo reports with every job
See how cleaning jobs are priced or how to check a contractor.
What we’re called out for in Derry Downs
As hot, greasy air travels up the duct, it cools and leaves a film behind. The thickest layers can sit out of sight in the plenum, at bends and along flat runs.
Most sites get in touch after spotting something like this:
- Parts of the system left out of past cleans
- Extracts that may be over the 200 micron mean
- Systems cleaned on a calendar with no measurements
- Kitchens whose menu or hours have changed
If you cook for passing trade around St Mary Cray station, the extract can be cleaned between your last and first customer.
Before you book anyone
- What records you will receive afterwards
- Whether inaccessible sections are listed on the report
- Whether the whole system is included, or only the parts that are easy to reach
- How they set the interval to the next visit
Also near Derry Downs
Other services in Derry Downs
Questions from Derry Downs
Who would carry out a food hygiene inspection at a kitchen in Derry Downs?
That is Bromley council, whose environmental health officers carry out food hygiene inspections in Derry Downs. Have your latest TR19® certificate and photo report to hand, as an officer may ask how the extract is maintained.
Which fire service covers Derry Downs?
That is London Fire Brigade. A recent cleaning certificate and a note of the next clean date show that grease in the extract is being managed.
Can we book visits on a schedule?
Yes, of course. Send details of the systems and how they’re used and we’ll propose a schedule with a fixed quote.
Do you work with multi-site operators?
Yes. Tell us the addresses and what each needs and you’ll get one fixed quote.
Which sectors do you work in?
Commercial premises of every kind: from restaurants, pubs and hotels to schools, hospitals, care homes, offices, shops and food production sites. Work is timed around how each site runs.
What is a WFTT or DTT grease test?
Readings are taken using the Wet Film Thickness Test or the Deposit Thickness Test, then compare them with the TR19® Grease figures.
When should we have our next grease test?
It depends on how heavily the kitchen cooks. BESA’s minimum cleaning intervals are every 3, 6 or 12 months for heavy, moderate and light use, and grease readings help set the real interval.
What should I send you?
The site address, the type of premises and your opening hours, plus photos of the system and your last certificate or report if you have one.
Landlords, agents and facilities managers
We regularly work with managing agents. Tell us the site, the work and the access arrangements and we will come back with a fixed quote.
Landlords, managing agents and facilities managers book us, not only the businesses that use the systems. Shared systems, like a riser serving several units, need a clear agreement on who books the work, and we are happy to quote for all of it.
What staff can safely do
Some jobs should never be done in-house: entering ducts, working on fans, testing dampers and taking grease readings call for the right kit, training and safe access. Leave those to us.
If your staff spot something between visits, such as dripping grease, a noisy fan, a smell or a filter that will not come clean, they should report it rather than try to fix it. We’ll take a look and send you a fixed quote.
What affects the quote in Derry Downs
Before we fix a price, we need to know a few things. We look at:
- What state the system is in
- The times the site is available
- Site rules, permits and inductions
- Whether we need access equipment or extra panels
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.
What to send for a quote
To speed up the quote, please include:
- A few general shots of the system
- Any access panels or hatches you can see
- Where the plant sits or the system leaves the building, such as a roof or outside wall
- Your opening hours and when the area is out of use
We do not publish a price list, because no two systems are the same. Instead, we look at your site first, from photos or a survey, then send a fixed quote. To start, call us on 0345 646 2711 or email us.
TR19 inspection around Derry Downs
According to Food Standards Agency records, there are about 4 pubs, bars and clubs in Derry Downs 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. Overnight is the normal time to clean a London kitchen extract, so trading isn’t affected. Derry Downs sits within the area of London Fire Brigade. 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 run catering at a healthcare site, such as a hospital like Orpington Hospital about 1.8 miles south-west, the extract may need cleaning more often than a part-time kitchen. A hall kitchen that only cooks for events, whether near St Andrew's or elsewhere in Derry Downs, still needs its extract cleaned, just less often.
Derry Downs is about 1 mile east of Orpington, in Greater London. Sites in Derry Downs get the same service as everywhere we cover: diagnosis first, a fixed price, out-of-hours working where necessary and a written report with pictures. Derry Downs is one of 764 towns, villages and districts in Greater London we cover for commercial clients. Our London page covers sites nearby (12 miles or so).
Every address in BR5 and BR6 is covered for TR19 inspection, from the main roads to the quietest streets. We cover sites on Kent Road, Park Road and Cross Road and the roads around them. You’ll find Derry Downs on the A224, which makes it straightforward for our technicians to reach for out-of-hours visits. We also cover the places around Derry Downs: Orpington (1 mile west), St Mary Cray (1 mile north-west), Poverest (1 mile north-west), Kevington (1 mile east) and St Paul's Cray (1 mile north). Larger places within reach include London (12 miles north-west), City of Westminster (15 miles north-west), Marylebone (15 miles north-west), St Pancras (14 miles north-west), Shoreditch (13 miles north-west) and Walthamstow (15 miles north-west).
Near you in Derry Downs
We work in commercial kitchens and buildings around Harris Academy Orpington, The Priory School and The Royal Albert pub. For rail, the closest station is St Mary Cray station, about 0.8 miles north-west of the centre. Other landmarks nearby include London Borough of Bromley Museum (0.7 miles south-west) and Lullingstone Castle (3.9 miles south-east). The countryside around Derry Downs includes The Warren and Summer Hill.