Hertfordshire · TR19 inspections and grease testing
North Mymms TR19 inspection
For TR19 inspections, grease thickness testing, pre-clean surveys and post-clean verification in North Mymms, one call is all it takes: survey, fixed quote, work and sign-off. Fully insured, with CHAS, SafeContractor and ISO 9001.
- Kitchen extract systems with no recent grease readings
- Confirming a clean reached the whole system
- Surveys needed before quoting a full clean
How we handle TR19 inspection in North Mymms
BESA’s minimum cleaning frequencies depend on how long the kitchen cooks each day: every 3 months for heavy use of 12 to 16 hours a day, every 6 months for moderate use of 6 to 12 hours, and every 12 months for light use of 2 to 6 hours. Those are minimums, and grease readings help set the real interval. If you’re dealing with an insurer’s request for a TR19 audit and kitchens taken over with no cleaning records, we can put it right.
Work in a small place like North Mymms starts with a call to agree access and timings, and the clean covers the whole system, as it would anywhere: canopy to discharge, then a TR19® certificate and a photo report.
Duct Doctor has been trading since 2009, and we are a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. We also hold CHAS, SafeContractor and ISO 9001, and we are fully insured.
- Place
- North Mymms (AL9)
- Wider area
- Hertfordshire
- Reporting
- Certificate plus before-and-after pictures
- Quote
- Fixed quote, normally within a working day
- Hours
- Out of hours as standard, 24/7 emergency line
- Phone
- 0345 646 2711
- Checked
- 30 October 2026
Different parts, different methods
Horizontal duct runs
Flat duct runs collect grease along their base. Readings are taken along each run through its access panels.
Extract fan and discharge
The extract fan and its housing collect grease too. We check and test them as part of the inspection.
Aftercare tips
No system stays clean for ever, but care slows the build-up. Our tips:
- Never cook with filters missing
- Tell us if menus or opening hours change
- Have the latest report ready for insurance renewals
- Store grease readings where your insurer can see them
Any access problems we found are listed with a suggested fix. Fitting them before the next clean means the whole system gets done.
Keep filters clean and in place. Gaps around filters let grease get past them.
What affects the quote in North Mymms
Some jobs are bigger than they look, and some smaller. The main factors:
- A single visit or a regular plan
- Access, including roofs, risers and ceiling voids
- Parking and loading at the site
- The scale of the work
A single site or a whole portfolio, the quote is built the same way: the work involved, the access and the timing. The price is fixed before we start.
Helping us quote
When you contact us, these details help:
- The roof, plant room or outside wall the system runs to
- Close-ups of filters, grilles, hatches or access panels
- Any symptoms, from odd noises to smells or leaks
- The times we could work without disrupting the site
The quickest way to a quote is to send photos: 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 we can price many jobs without a visit.
When it’s something else
Some problems need a different service or another trade:
- Ductwork that was designed or installed badly
- Fan breakdowns, which need a repair visit
- Parts of the duct nobody can reach yet
If in doubt, call us on 0345 646 2711 or send us an email and we will say what we think before booking.
Where we work
- Insurer audits
- Access surveys
- Deposit thickness tests
- Pre-clean surveys
- Post-clean checks
- Wet film thickness tests
Grease, kitchens and North Mymms
The FSA’s food hygiene register shows about 15 cafés, restaurants and staff canteens and about 5 sandwich bars and takeaways within roughly a mile and a half of the centre of North Mymms. Where they cook under a canopy, a grease reading is the way to tell whether the extract is due a clean. It’s Welwyn Hatfield council that sends environmental health officers to food businesses in North Mymms. A greasy canopy or dripping filters are the sort of thing an inspection can pick up. Before-and-after pictures from each clean are a simple way to show the extract is in hand. The fire and rescue service for North Mymms is 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.
Where a hall near Church of St Mary the Virgin, or anywhere in North Mymms, hosts lunch clubs or events, its extract gathers grease just as a café’s does. School kitchens, at schools like Brookmans Park Primary School for example, are typically cleaned in the holidays so no lunches are lost.
North Mymms is about 2 miles north-west of Potters Bar, in Hertfordshire. Anywhere in AL9, we can take on TR19 inspection. Our area takes in 381 places across Hertfordshire, from busy centres to quieter spots. We also work in London, about 16 miles from North Mymms.
Work in AL9 is surveyed, quoted and booked the same way as anywhere else. Whether your site is on St Mary's Church Road, Abdale Lane and Warrengate Road or a nearby road, our technicians can take on the work. Neighbouring places we cover for TR19 inspection include Welham Green (1 mile north), Colney Heath (2 miles north-west), Sleapshyde (3 miles north-west), Hatfield (3 miles north) and Shenleybury (3 miles west). Within a short drive, we also cover Watford (9 miles south-west), Hemel Hempstead (11 miles west), Stevenage (13 miles north), St Albans (5 miles north-west), Welwyn Garden City (6 miles north) and Harpenden (9 miles north-west).
Local landmarks in North Mymms
In North Mymms, that means kitchens and buildings near Chancellor's School, North Mimms Park and The Old Maypole Public House, among other places. North Mymms’s nearest station is Brookmans Park station, roughly 0.7 miles east of the centre. Nearby you’ll also find Shenley Hospital (3.5 miles south-west) and Potters Bar Museum (2 miles south-east). Not far away are Furzefield Wood and Lower Halfpenny.
What happens on the day
A visit follows the same order every time: protect the area, make the system safe, do the work, tidy up and leave you the report. On site, the work takes an hour or two for a single kitchen, longer for a large or complex system. If the van will struggle with a lane or gateway near North Mymms, let us know and we’ll plan around it.
- First we look at the system’s cleaning history, if there is one.
- The layout is traced from the canopy to the 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
- Plan for cooking equipment or plant to be off before we arrive
- Let us know how we reach the system, including roofs, risers and plant rooms
- Mention any sign-in, permit or induction we need
Get a fixed quote
Some systems can be priced from photos; others need a survey. Big or complicated sites, and systems that are hard to see in pictures, get a survey first. Either way, you get a fixed price before we start.
Read more
Landlords, agents and facilities managers
Running several sites is easier with one contractor. We work across London and the South East, so visits at different addresses can be planned together and kept to a regular schedule.
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.
Places near North Mymms
Also in North Mymms
North Mymms questions
Can the work in North Mymms be done at night or at weekends?
Yes, evening, overnight and weekend work is normal for us. The work in North Mymms can fit around your hours. Just ring 0345 646 2711 or email us with your opening times and we’ll plan around them.
Do you clean school canteen extracts around North Mymms out of term?
Yes, holiday work suits schools best. With about 3 schools and colleges on the FSA’s register within roughly a mile and a half of North Mymms, it pays to plan holiday dates ahead. Booking early in the term gives the best choice of holiday dates.
What is post-clean verification?
Post-clean verification is a check after a clean, with fresh grease readings and photos. It can follow our own cleans or another contractor’s.
Can you look after several sites?
Yes. We work across South East England and London, so we can schedule a run of sites as one programme. Every site has its own report.
Why survey before a clean?
We survey, measure and photograph the system first. The survey can be done from pictures and details or on site, whichever suits the system.
Are you accredited?
CHAS, SafeContractor, ISO 9001 and BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease. We have been trading since 2009 and we’re fully insured.
Is a quote from pictures possible?
In many cases, yes. With good pictures, the site type and your last report, we can price many jobs. Larger or hidden systems need a survey on site first.
What about areas you cannot get to?
They’re marked on the report. In ductwork, new access panels are often the answer, and we can fit those.
Signs you need TR19 inspection in North Mymms
Menus, opening hours and cooking styles change over time, and more frying or longer hours mean more grease. The old cleaning schedule may not match the kitchen any more.
These are the problems we see most often:
- Missing access panels found on survey
- Extracts that have never been grease tested
- Missing TR19 certificates or history
- Insurance renewals needing proof of TR19 cleaning
A kitchen near Brookmans Park station that serves breakfast and dinner can run its extract twelve hours or more, which shortens the cleaning interval.
Comparing quotes
- How areas they cannot reach will be recorded
- How VAT is shown on the quote
- How they set the interval to the next visit
- Whether a written report and photos are included