Hertfordshire · TR19 inspections and grease testing
TR19 inspections and grease testing in Northaw Valley, Hertfordshire
Need TR19 inspection in Northaw Valley? We diagnose first, fix the price and book the work around your hours, then sign off with a report and photos.
- Cleaning intervals that may not suit the kitchen
- Post-clean verification after another contractor’s clean
- Parts of the system left out of past cleans
How we handle TR19 inspection in Northaw Valley
TR19® Grease says grease should not exceed a mean of 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 are on. The work covers pre-clean surveys, deposit thickness tests and insurer audits, and the jobs we see most are insurers asking for TR19 evidence and kitchens whose menu or hours have changed.
In a small place like Northaw Valley, kitchens are often in older or extended buildings, with long single-storey duct runs, and those horizontal sections are where grease settles. We agree access and timings in advance.
The report is your system’s health record: a dated account with photos of everything we did. Grease extract cleans are also certificated to TR19® Grease through the BESCA VHE portal, ready for your insurer.
- Location
- Northaw Valley (EN6)
- Wider area
- Hertfordshire
- Reporting
- Certificate plus before-and-after photos
- Price
- Fixed quote, usually within a working day
- Hours
- After hours by arrangement; emergencies any time
- Phone
- 0345 646 2711
- Checked
- 30 October 2026
Questions from Northaw Valley
Which fire authority looks after Northaw Valley?
Northaw Valley is in the area of Hertfordshire Fire and Rescue Service. It’s worth keeping your fire risk assessment, TR19® certificates and photo reports together, ready to show.
Can you come to Northaw Valley after we close?
Yes, out-of-hours work is a big part of what we do. The site is handed back ready to open. When you ring 0345 646 2711 or email us, mention when the site is quiet.
What is a WFTT or DTT grease test?
WFTT and DTT are the two methods for measuring grease thickness, in microns. We take readings at set points from canopy to fan.
How do you protect the area?
Protection goes down first: floor sheeting and covers over nearby surfaces and equipment. We tidy up and take our waste away before we leave.
What do the grease readings need to be?
TR19® Grease says grease should not go over a mean of 200 microns between cleans. Any reading of 500 microns or more needs immediate spot cleaning.
What does TR19 inspection cost?
Size, condition, access and working hours all affect the cost. Call for a fixed quote, usually ready within one working day.
What if parts of the system cannot be reached?
The report shows them clearly. Often the fix is extra access, such as new panels in ductwork, and we can fit those.
What types of premises do you cover?
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 TR19 inspection can’t fix
Before booking, it helps to know what’s not included:
- Fire safety duties beyond the extract system
- Heavy deposits found on test, which still need cleaning
- Fan breakdowns, which need a repair visit
If you are not sure, just call us on 0345 646 2711, or email photos and we’ll give you a straight answer.
Where we work
- Insurer audits
- Pre-clean surveys
- Access surveys
- Post-clean checks
- Wet film thickness tests
- Deposit thickness tests
How it works
Every visit runs to the same pattern: protect the area, make the system safe, carry out the TR19 inspection, clear away 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. Visits to a village like Northaw Valley are booked in advance, at a time that suits whoever runs the site.
- After the clean, we arrange a time to check the system.
- The same access points are opened up.
- We repeat the WFTT or DTT readings.
- We photograph each area to record how it was left.
- We report the findings and flag any areas that need more work.
Preparing for the visit
- Let us know about parking and loading
- Tell us about access, such as roof hatches, plant rooms, ceilings or locked areas
- Find the previous report, if there is one
How to get a quote
Want a quote for TR19 inspection? Please give us a ring on 0345 646 2711, or email photos with a few details about the site. We’ll explain what we’d do and send a fixed quote before you commit to anything.
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Also near Northaw Valley
Other services in Northaw Valley
Fixed quotes for TR19 inspection in Northaw Valley
Sites vary more than people expect. The main factors:
- Site requirements such as sign-in and permits
- Parking and loading at the site
- How easy every part is to reach
- What state the system is in
Combining work into one visit or one programme often makes better use of the time. Mention every system or site you need covered, and you will get one fixed quote.
Helping us quote
The more you tell us, the more accurate the quote. When you get in touch, it helps to send:
- Where the site is and what kind of site it is
- The times we could work without disrupting the site
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
- Any previous report or certificate
To get a fixed quote, give us a ring on 0345 646 2711 or drop us a line and tell us the type of site, your opening hours and roughly what the system looks like. Photos and the last report, if you have one, make the quote quicker. You will usually have a quote within one working day.
Why deal with it now?
If there’s a fire or a claim, your insurer may ask for TR19 records. Missing records can put a claim at risk. Getting an inspection done now starts that paper trail. In a small place like Northaw Valley, a system that fails can take a site out of use.
A single site or a whole portfolio, we price it on the same basis: what needs doing, how we get to it and when. You’ll have a fixed price before we start.
Why choose Duct Doctor in Northaw Valley
- CHAS, SafeContractor and ISO 9001
- Work around your opening hours, with 24/7 emergency cover
- Ventilation hygiene specialists since 2009
- Each visit written up, with pictures
Take a look at how cleaning jobs are priced or how to check a contractor.
What your team can do, and what needs us
When your team notices a problem between visits, such as dripping grease, a noisy fan, a smell or a filter that won’t come clean, they should report it rather than try to fix it. We will take a look and give you a fixed quote.
Day-to-day cleaning is something your team can do: wiping canopies, washing grease filters and recording it in a log. What they can’t safely do is clean inside the ductwork, the fan or the risers, which is where we come in.
For landlords and multi-site operators
We work for landlords, managing agents and facilities managers as well as the people running the site. 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.
Keeping records across a portfolio is half the battle. Each visit produces a dated report with photos, ready to show insurers, fire officers or EHOs.
Signs you need TR19 inspection in Northaw Valley
TR19® is the benchmark that insurers, fire officers and EHOs refer to. It is not legislation; the legal duty comes from the Fire Safety Order 2005, under which the responsible person must reduce fire risk, and grease in the extract is part of that risk.
It’s time to book a visit if you see:
- Post-clean verification after another contractor’s clean
- Systems cleaned on a calendar with no measurements
- Pre-clean surveys before a first TR19 clean
- Extracts that may be over the 200 micron mean
For schools such as St. John's Senior School, kitchen extract cleaning is usually booked for the holidays, when the canteen is closed.
Questions to ask before booking
- How they set the interval to the next visit
- Whether they’re fully insured
- What happens if part of the system cannot be accessed
- Exactly which parts of the system are covered
Kitchen extracts in Northaw Valley
Food Standards Agency data counts about 5 cafés, restaurants and staff canteens within roughly a mile and a half of the centre of Northaw Valley. Kitchens like these cook for very different hours, and grease testing shows which extracts need cleaning soonest. The fire and rescue service for Northaw Valley is 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. It’s Welwyn Hatfield council that sends environmental health officers to food businesses in Northaw Valley. A greasy canopy or dripping filters are the sort of thing an inspection can pick up. Keeping each certificate and photo report on file helps show the extract is looked after.
If you run a church or community hall kitchen, near Parish Church of St Thomas A Becket or elsewhere in Northaw Valley, its extract still collects grease from every lunch and event. Healthcare kitchens can’t easily close, so their extracts are cleaned overnight or between meal services; the nearest hospital to Northaw Valley is Chase Farm Hospital, about 2.3 miles south-east.
Northaw Valley is about 2 miles east of Potters Bar, in Hertfordshire. Wherever you are in the EN6 postcode area, we can take on TR19 inspection. We cover 381 places across Hertfordshire, from busy centres to quieter spots. For sites nearby, see our London page, about 14 miles away.
Every address in EN6 is within our area for TR19 inspection, from the main roads to the quietest streets. Nearby, we also carry out TR19 inspection in Botany Bay (1 mile south-east), Potters Bar (2 miles west), Hadley Wood (3 miles south-west), Bentley Heath (3 miles west) and Cockfosters (3 miles south). We also work in nearby towns such as Watford (11 miles west), Hemel Hempstead (14 miles west), Stevenage (15 miles north), St Albans (9 miles north-west), Welwyn Garden City (8 miles north) and Harpenden (12 miles north-west).
Landmarks near Northaw Valley
Around Northaw Valley, our work takes us to kitchens and buildings near Two Brewers Public House, Northaw Church of England Primary School and Mount Grace School and the streets around them. The nearest railway station is Crews Hill station, about 1.4 miles south-east of the centre. Other landmarks nearby include Spires Shopping Centre (3.8 miles south-west) and Chase Farm Hospital (2.3 miles south-east). For a walk, there’s Bowyer's Water and Fir and Pond Woods.