Hertfordshire · Ductwork cleaning
Walsworth ductwork cleaning
For cleaning of kitchen extract ductwork, horizontal runs and vertical risers through access panels in Walsworth, one call is all it takes, from survey to sign-off. Fully insured, with CHAS, SafeContractor and ISO 9001.
- Duct runs with no cleaning record
- Grease pooling at the foot of the riser
- Sections of duct with no access panels
About our ductwork cleaning in Walsworth
Duct Doctor has cleaned kitchen extract ductwork since 2009, working across London and the South East. We are a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, and our certificates are issued through the BESCA Vent Hygiene Elite portal. The work covers vertical risers, bends and junctions and attenuators, and the jobs we see most are gaps where access panels were never fitted and thick crusts of old grease along the duct.
Around a smaller place like Walsworth, kitchen extracts tend to belong to pubs, cafés, takeaways and school or care home kitchens. A kitchen that cooks fewer hours still builds up grease, so cleaning is planned around how much it cooks and what the readings show.
It’s worth checking any contractor’s accreditations. Ours are BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease, plus CHAS, SafeContractor and ISO 9001, and we’re fully insured.
- Location
- Walsworth (SG4, SG5)
- Wider area
- Hertfordshire
- Paperwork
- TR19® certificate and photo report
- Quotes
- A fixed price before work begins
- Hours
- Nights, weekends or holidays to suit you
- Phone
- 0345 646 2711
- Reviewed
- 30 October 2026
The process
The first job on site is protection: sheeting goes over floors and surfaces close to the work. Then we make the system safe and start. The work on site takes a few hours for a short run, longer for long runs and tall risers, and we clear up before we go. Tell us when your site near Walsworth is quiet and the visit will be booked for then.
- First the duct route is traced and every access point noted.
- Grease readings are taken at set points along the duct.
- Access panels are opened and heavy deposits scraped out by hand.
- Horizontal runs and risers are then degreased by the method that suits the deposit.
- Post-clean readings and pictures go into the report, with any unreachable section listed.
Preparing for the visit
- Name a contact who can let us in at the agreed time
- Tell us about site rules, permits or sign-in
- Tell us where we can park and unload
Ask for a quote
To help us quote: where the site is, what it is and its opening hours, pictures of the system and the last certificate or report, if there is one. Once you have those, call us on 0345 646 2711, or email photos.
Related advice
What the work involves, part by part
Multi-storey and shared buildings
A duct that climbs several floors may be cleaned over more than one visit. Visits are planned around the building’s hours, out of hours where possible.
Attenuators and discharge
Attenuators, where fitted, quieten the extract, but they can hold grease in their linings. We clean what can be reached and note anything that cannot.
What ductwork cleaning can’t fix
To be straight with you, there are a few things this work will not fix:
- A duct that is too small or badly routed for the kitchen (a design issue)
- Parts of the duct with no way in
- Duct sections that need replacing
If in doubt, call 0345 646 2711 or send us an email and we will say what we think before booking.
What the work covers
- Vertical risers
- Access panels
- Horizontal duct runs
- Bends and junctions
- Attenuators
- Multi-storey ducts
Common problems we fix in Walsworth
Grease filters that don’t seal let fat straight through. More grease reaches the ductwork than it should, and build-up speeds up.
Clients normally contact us after spotting one of these:
- Grease leaking from duct joints
- Stale grease odours from the duct
- Readings above 200 microns from a grease thickness test
- Ductwork that has never been cleaned
A hall kitchen that only cooks for events, whether near St Faith's Church or elsewhere in Walsworth, still needs its extract cleaned, just less often.
Comparing quotes
- What insurance they carry
- What hours they’ll be on site
- Whether a survey comes first
- What records you will receive afterwards
Grease, kitchens and Walsworth
According to Food Standards Agency records, there are about 37 bars, pubs and nightclubs and about 5 hotels and guest houses across Walsworth and its immediate surroundings (about a mile and a half). A pub or hotel kitchen that cooks every day builds up grease in its extract like any other. In Walsworth, food businesses are inspected by environmental health officers from North Hertfordshire council. An officer looking round a kitchen will see the canopy, and grease there is hard to miss. A TR19® certificate and photo report after each clean gives you a record to show an inspector. Walsworth sits within the area of 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.
Term dates shape school work: for a school like Highover Junior Mixed and Infant School, an extract clean fits neatly into a half-term or summer break. A kitchen near Hitchin station that serves breakfast and dinner can run its extract twelve hours or more, which shortens the cleaning interval.
Walsworth is about 1 mile north-east of Hitchin, in Hertfordshire. We carry out ductwork cleaning for commercial premises of every kind in Walsworth and the rest of Hertfordshire. Across Hertfordshire, we cover 381 places, Walsworth among them. Milton Keynes is in our area too, around 22 miles away.
Here we cover the SG4 and SG5 postcode area for ductwork cleaning. You’ll find streets such as Green Lane, Orchard Road and Purwell Lane, all of which we cover for ductwork cleaning. If your site is just outside Walsworth, we cover Poets Estate (1 mile south), Benslow (1 mile south-west), Hitchin (1 mile south-west), Bearton (1 mile west) and Great Wymondley (1 mile south-east). We also work in nearby towns such as Stevenage (5 miles south-east), St Albans (14 miles south), Welwyn Garden City (11 miles south), Harpenden (10 miles south), Hatfield (13 miles south) and Hertford (13 miles south-east).
Local landmarks in Walsworth
We work in commercial kitchens and buildings around The Millstream pub, Kingshott School and St Mary's Church. Other local landmarks include Hitchin Girls' School (0.8 miles south-west) and Butts Close (1.2 miles west). Walsworth has its own railway station: Hitchin station. A little further out are Wymondley Castle (1.4 miles south-east) and Lister Hospital (2.9 miles south-east). The countryside around Walsworth includes Markham's Hill and Purwell Ninesprings.
Nearby places to Walsworth
What else we do in Walsworth
In-house cleaning or a specialist?
Staff cleaning and specialist work aren’t the same thing. A daily filter wipe and a weekly filter wash keep grease down at the front of the system, but grease that has passed the filters is out of reach. That part needs specialist access and equipment.
Day-to-day cleaning is something your team can do: wiping canopies, washing grease filters and recording it in a log. Inside the ducts, risers and fan is specialist work, which is where we come in.
Keeping the system healthy
No system stays clean for ever, but care slows the build-up. Our tips:
- Leave a way through to the access panels
- Tell us if grease leaks from the ductwork
- Consider fitting panels where the report shows gaps
- Keep to the interval on the report
Grease readings are taken again at the same set points, so the report shows the before and after figures. Before and after photos sit next to the numbers.
Book the next duct clean before the date passes. If the kitchen starts cooking longer hours, the interval may need to shorten, and grease thickness testing will show it.
Multi-site and managed buildings
Keeping records across a portfolio is half the battle. Each visit produces a dated report with pictures, so you can show an insurer or inspector what was done at each site.
Multi-site operators often want one contractor and one number. We cover South East England and London, so a run of sites can go into one programme and kept on a regular cycle.
FAQs for Walsworth
Who would carry out a food hygiene inspection at a kitchen in Walsworth?
That is North Hertfordshire council, whose environmental health officers carry out food hygiene inspections in Walsworth. How often a business is inspected depends on the risk rating the council gives it, so it’s worth staying ready all year.
Which fire and rescue service is responsible for Walsworth?
It’s Hertfordshire Fire and Rescue Service, which covers Walsworth. TR19® is not law, but it’s the benchmark many fire officers and insurers look to when they ask how often the extract is cleaned.
Can one contract cover all our sites?
Yes. We work across South East England and London, so sites at different addresses can be planned together as one programme. Each site gets its own report and pictures.
Is a quote from photos possible?
In many cases, yes. Photos of the system and the access, plus your opening hours and last report, are often enough. Larger or hidden systems need a survey on site first.
Do you look at the system first?
Yes. For many sites, photos and a few details are enough, and larger or hidden systems get a visit.
Do you offer maintenance contracts?
Yes. We run scheduled maintenance contracts, with visits at the interval your system needs. The report from each visit recommends the next date.
How do you know if the ductwork needs cleaning?
The date on the last certificate is the first thing to check. If it’s overdue, or there isn’t one, a clean is due, and grease readings will confirm how urgent it is.
How do you clean inside the ductwork?
After a survey and grease readings, the duct is opened up through its access panels. We clean the runs and risers section by section, then the readings are repeated.