Hertfordshire · TR19 inspections and grease testing
TR19 inspections in Great Offley
One call covers TR19 inspections and grease testing in Great Offley: survey, fixed quote, work and sign-off. Fully insured, with CHAS, SafeContractor and ISO 9001.
- Sites with gaps in their extract records
- An insurer’s request for a TR19 audit
- Ductwork where grease may be over the TR19 limits
What staff can safely do
Good housekeeping makes our visits easier, not unnecessary. Clean filters and tidy surfaces slow the build-up, but the parts you can’t see still need a specialist at the right interval.
For ventilation and air handling systems, in-house care is mostly about checks: clear grilles, a log of filter changes and reporting anything odd. The inside of ducts and units needs a specialist.
TR19 inspection in Great Offley
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. Common call-outs are for post-clean verification after another contractor’s clean and systems cleaned on a calendar with no measurements, on insurer audits, access surveys and deposit thickness tests.
Somewhere as small as Great Offley, commercial kitchens are few: perhaps a pub, a school or care home kitchen, or a hall used for events. Every one of them still needs its extract kept clear of grease.
Duct Doctor has been trading since 2009, and we’re a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. CHAS, SafeContractor and ISO 9001 are in place too, and we are fully insured.
- Place
- Great Offley (SG5)
- Wider area
- Hertfordshire
- Paperwork
- TR19® certificate and photo report
- Price
- Fixed quote, usually within a working day
- Hours
- After hours by arrangement; emergencies any time
- Call
- 0345 646 2711
- Checked
- 30 October 2026
What affects the quote in Great Offley
Some jobs are bigger than they look, and some smaller. The main factors:
- Access, including roofs, risers and ceiling voids
- Parking and loading at the site
- How many systems or sites are involved
- Site rules, permits and inductions
Whatever the type of site, the quote works the same way: how much there is, how we reach it, what state it’s in and when we can work. Ask for a fixed quote and we’ll go through it with you.
What to send for a quote
When you call or email, these details help:
- The times we could work without disrupting the site
- The postcode and the type of business
- Close-ups of filters, grilles, hatches or access panels
- A few general shots of the system
For a fixed quote, call us on 0345 646 2711 or email us 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 typically have a quote within one working day.
Why act early in Great Offley
Sites in Great Offley that have never measured grease can’t tell whether their cleaning interval suits the kitchen. Measured readings let a competent person set the interval. With notice, the visit to Great Offley can be fitted around your bookings and events.
A single site or a whole portfolio, the quote is built the same way: what needs doing, how we get to it and when. The price is fixed before work begins.
Why Great Offley businesses choose us
- Out-of-hours work and a 24/7 emergency line
- One number for every site across the South East and London
- Survey first, then a fixed quote
- Full insurance on every job
Read how cleaning jobs are priced or our accreditations and certificates.
Questions from Great Offley
Will you come out to Great Offley?
Yes, Great Offley is part of our area, however small the site. Just mention lanes, gates or anything else about the site when you book.
Which fire service covers Great Offley?
Great Offley is in the area of Hertfordshire Fire and Rescue Service. A recent cleaning certificate and a note of the next clean date show that grease in the extract is being managed.
Can you come out in an emergency?
Yes, any time. For anything urgent, such as a fan failure or damage after a fire, ring the 24/7 line and we’ll talk you through the next steps.
Can we book visits on a schedule?
Yes. We run scheduled maintenance contracts, with visits at the interval your system needs. Each report recommends when the next visit should be.
Do you carry out TR19 audits for insurers?
Yes. We inspect the system and produce a report with grease readings, pictures and any inaccessible areas. You can pass it straight to your insurer or broker.
When should we have our next grease test?
Enough to be sure grease stays within the TR19® Grease figures between cleans. The readings themselves tell you if the interval needs to change.
What happens on a pre-clean survey?
A survey finds out how the system is laid out, how dirty it is and what can be reached, before anyone starts cleaning. Any access problems are flagged so they can be sorted first.
Can the work be done while we are closed?
Yes. Evenings, nights and weekends are normal working hours for us, so you do not have to close during trading.
Towns and villages near Great Offley
What else we do in Great Offley
How the visit works
We work around your opening hours, not the other way round. Most visits are booked for when the area is out of use, such as evenings, overnight, early mornings or weekends. Once we are in, the area is sheeted and anything that has to be off is turned off and cooled, and the work takes anything from an hour for a small canopy and short duct to a good part of a day for a large site. In a small place like Great Offley, the journey is planned ahead and the visit arranged around the site’s hours.
- The visit is arranged for when the kitchen isn’t busy.
- The system is checked from canopy to discharge.
- Grease readings are taken at set points using WFTT or DTT.
- Photos are taken at each point, and access gaps noted.
- The findings go into a report with readings, photos and a recommended next clean.
How to prepare
- Mention any locked doors, roof access or ceiling voids
- Make sure someone can let us in and lock up afterwards
- Clear loose items from the work area
How to get a quote
We don’t publish a price list, because no two systems are the same. We look at your system first, from photos or on a visit, and then give you a fixed quote. To start, call 0345 646 2711 or use the quote form.
Related advice
Do you need TR19 inspection in Great Offley?
You cannot judge grease thickness by eye. Clean filters can hide a heavy layer behind them, so readings are the reliable guide.
These are the problems we see most often:
- Heavy grease suspected in the plenum or ducts
- Missing access panels found on survey
- An insurer’s request for a TR19 audit
- Systems that need surveying before cleaning
If you look after a school kitchen, at a school such as Offley Endowed Primary School or anywhere near Great Offley, the holidays are the usual time for a TR19® clean.
Questions to ask before booking
- Whether inaccessible sections are listed on the report
- Whether they’re fully insured
- When they can work, and whether that’s outside your opening hours
- What’s included in the scope, part by part
Part by part
Restaurants, pubs and hotels
Inspections are done when the kitchen is closed or quiet so trading isn’t affected.
Canopy and plenum
The canopy itself is checked inside and out, and note where grease has gathered.
Multi-site and managed buildings
The Fire Safety Order 2005 puts the duty to manage fire risk on the responsible person, which may be the employer, owner, landlord, FM or managing agent. Where responsibility is shared, records matter even more.
Managing agents often deal with us directly. Tell us the site, the work and the access arrangements and we’ll come back with a fixed quote.
TR19 inspection around Great Offley
The Food Standards Agency lists about 4 pubs, bars and clubs as registered food businesses within about 1.5 miles of central Great Offley. Breakfasts, bar meals and functions all put grease into the extract wherever they’re cooked. Food hygiene inspections in Great Offley are the job of North Hertfordshire council’s environmental health team. The cleanliness of the kitchen and its equipment, extraction included, is part of what they check. Keeping each certificate and photo report on file helps show the extract is looked after. Great Offley sits within the area of Hertfordshire Fire and Rescue Service. Its fire safety officers can audit commercial kitchens, and grease in the extract is part of a kitchen’s fire risk.
If you run catering at a healthcare site, such as a hospital like Keech Hospice Care about 4.2 miles west, the extract may need cleaning more often than a part-time kitchen. Volunteers running a hall kitchen near Church of St Mary Magdalene, or anywhere in Great Offley, may not know when the extract was last cleaned, and a grease test settles it.
Great Offley is about 3 miles south-west of Hitchin, in Hertfordshire. Every kind of commercial site in Great Offley, TR19 inspection is something we can help with. We can work out of hours so the site keeps running. Great Offley is one of 381 places in Hertfordshire we cover for commercial clients. Our Milton Keynes page covers sites nearby, about 20 miles away.
Work in SG5 is surveyed, quoted and booked the same way as anywhere else. Whether your site is on High Street, Garden Fields and John Hall Court or a nearby road, our technicians can take on the work. We also cover the places around Great Offley: The Flints (1 mile west), Temple End (2 miles east), Ley Green (2 miles south-east) and Pegsdon (2 miles north-west). Within a short drive, we also cover Hemel Hempstead (13 miles south-west), Stevenage (7 miles east), St Albans (12 miles south), Welwyn Garden City (11 miles south-east), Harpenden (8 miles south) and Hitchin (3 miles north-east).
What’s near Great Offley
We work in commercial kitchens and buildings around The Bull Public House, among other places. Great Offley’s nearest station is Hitchin station, about 3.7 miles north-east of the centre. Well-known places in the area include Ravensburgh Castle (3.1 miles north-west) and Keech Hospice Care (4.2 miles west). Not far away are Pegsdon Hills and Markham's Hill.