Hertfordshire · Ductwork cleaning
Ductwork Cleaning in Old Knebworth
Specialist ductwork cleaning for Old Knebworth: a survey, a fixed price, careful work and proper paperwork. Ask us for a fixed quote.
- Readings above 200 microns from a grease thickness test
- Proof of duct cleaning for the insurer
- Thick crusts of old grease along the duct
Questions from Old Knebworth
Can you work in Old Knebworth outside opening hours?
Yes. We work evenings, overnight and at weekends. That way a site in Old Knebworth does not have to lose a day’s trading. Let us know the hours you are closed and we will book within them.
Who would carry out a food hygiene inspection at a kitchen in Old Knebworth?
The local authority for Old Knebworth is North Hertfordshire council, and its environmental health team does the inspecting. An officer may look up into the canopy, so clean filters on the day and a recent certificate on file both help.
How do you clean inside the ductwork?
We open each access panel and clean the section it reaches. Heavy grease comes out by hand, and what’s left is degreased, with readings taken before and after.
What happens if you cannot reach some of it?
They’re listed in the report, never skipped quietly. The report says which parts couldn’t be reached and why, along with a quote to put access in.
How often does extract ductwork need cleaning?
It depends mostly on daily cooking hours. Kitchens cooking 12 to 16 hours a day need it at least every 3 months, while lighter use can go longer.
Will we have to shut during the visit?
Not normally. Visits are timed for when the area is closed, such as overnight or at a weekend, so the site can carry on as normal.
What happens if there aren’t enough access panels?
Without a way in, a section cannot be cleaned properly. We record those sections on the report and can fit access panels.
How far ahead should we book?
Book as early as you can for planned work, particularly if your next visit is nearly due. For emergencies, we take calls 24/7.
How we handle ductwork cleaning in Old Knebworth
The ductwork is where an extract clean is won or lost. Sections with no way in can go uncleaned for years. We open up every reachable section and record any we can’t reach, so you know exactly where you stand. The work covers multi-storey ducts, vertical risers and access panels, and people most often call us about high readings at a recent grease test and heavy grease at the base of a riser.
Somewhere as small as Old Knebworth, 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, whatever the size of the place.
The report is your system’s health record: dated, with pictures, and showing what was done. For TR19® Grease cleans, the certificate comes through the BESCA Vent Hygiene Elite portal and sits alongside the report.
- Location
- Old Knebworth (SG3)
- Wider area
- Hertfordshire
- Records
- TR19® certificate and photo report
- Quotes
- Fixed quote, typically within a working day
- Working hours
- Overnight and weekend work, 24/7 emergency callout
- Telephone
- 0345 646 2711
- Reviewed
- 30 October 2026
Managing agents and facilities teams in Old Knebworth
We regularly work with managing agents. Send the address, what’s needed and how access works and we will come back with a fixed quote.
Running several sites is easier with one contractor. We work across London and the South East, so a run of sites can go into one programme and kept on a regular cycle.
Part by part
Vertical risers
Risers often pass through floors and walls, where fire dampers may be fitted. We test those as a separate job.
Horizontal duct runs
Flat runs of duct link the canopy to the riser or the outside wall. They collect grease as the air cools and slows, and we clean them section by section through access panels.
What your team can do, and what needs us
Staff cleaning doesn’t replace a specialist visit; it supports it. Clean filters and tidy surfaces slow the build-up, but the parts you cannot see still need a specialist at the right interval.
Logging matters as much as cleaning. A dated log of in-house cleaning and checks helps show that the system is managed between specialist visits, alongside our reports.
Signs you need ductwork cleaning in Old Knebworth
Damaged or poorly fitted filters let more grease into the duct. The duct then takes grease that the filters should have stopped and it fills faster.
Most sites get in touch when they notice one of these:
- Duct runs with no cleaning record
- Grease seeping out of the duct seams
- A rancid smell from the extract duct
- Duct runs that can’t be reached
Older buildings often hide long, awkward duct runs, and if you run a kitchen at a historic venue in the area (Knebworth House is about 0.2 miles north-west), access may need planning.
Questions to ask before you book
- If they look at the system before pricing
- Whether VAT is included
- Whether the whole system is included, or only the parts that are easy to reach
- Whether a written report and photos are included
Between visits
Here’s the after-treatment advice, in brief:
- Store the certificate with the fire risk assessment
- Get panels fitted where the duct couldn’t be cleaned
- Keep to the interval on the report
- Keep access panels clear of stored items
Keep the certificate and report with the fire risk assessment. It’s the evidence an insurer or inspector may ask for, and the photos make the duct’s condition easy to see.
Run the extract the whole time the kitchen is cooking. When the air stops, grease settles in the duct, so switching off early adds to the build-up.
Ductwork cleaning in Old Knebworth: the local picture
Food Standards Agency records list about 17 restaurants, cafés and works canteens and about 11 sandwich bars and takeaways within about 1.5 miles of central Old Knebworth. The duct above a busy canopy coats itself in grease long before anyone sees it. Fire safety in Old Knebworth falls to 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 North Hertfordshire council that sends environmental health officers to food businesses in Old Knebworth. Extraction counts as kitchen equipment, so its condition can come up on the day. A TR19® certificate and photo report after each clean gives you a record to show an inspector.
For schools such as Barnwell School, kitchen extract cleaning is usually booked for the holidays, when the canteen is closed. Healthcare kitchens can’t easily close, so their extracts are cleaned overnight or between meal services; the nearest hospital to Old Knebworth is Lister Hospital, about 3.7 miles north.
Old Knebworth is about 3 miles south-west of Stevenage, in Hertfordshire. Every kind of commercial site in Old Knebworth, ductwork cleaning is something we can help with. We can work out of hours so the site keeps running. Across Hertfordshire, we cover 381 places, and Old Knebworth is one of them. London is in our area too, around 26 miles away.
Here we cover the SG3 postcode area for ductwork cleaning. Streets in the area include Old Knebworth Lane and Park Lane, all of which we cover for ductwork cleaning. We also cover the places around Old Knebworth: Nup End Green (1 mile south-west), Driver's End (1 mile south-west), Rableyheath (1 mile south), Pottersheath (1 mile south) and Langley (2 miles north-west). Further out, we also cover Hemel Hempstead (13 miles south-west), Stevenage (3 miles north-east), St Albans (10 miles south-west), Welwyn Garden City (5 miles south), Harpenden (7 miles south-west) and Hitchin (6 miles north-west).
Near you in Old Knebworth
Locally, jobs take us to businesses close to Knebworth Park and Robin Hood And Little John Public House. Old Knebworth’s nearest station is Knebworth station, about 1 mile east of the centre. Well-known places in the area include Lister Hospital (3.7 miles north) and Stevenage Museum (2.2 miles north). Green spaces nearby include Mardley Heath.
How the visit works
Everything the job needs comes with us, including protection sheets, the right tools and access kit. All we need from you is clear access and the right equipment switched off. On site, the work takes a shift or more, depending on the length of the runs and the number of access points. A few photos of the system help us make the most of a visit to a place like Old Knebworth.
- We trace the duct and find every way in.
- We take grease readings along the route.
- Once the kitchen has closed, we protect the area and open the panels.
- Heavy deposits come out by hand, then each section is degreased.
- Panels are closed, readings and photos repeated, and unreachable sections recorded.
Preparing for the visit
- Mention any sign-in, permit or induction we need
- Agree a time when the area can be out of use
- Have your last certificate or report to hand
Ask for a quote
Quotes are quick. Call or email with a few details and you’ll typically have a fixed price within one working day. Where a survey is needed, we arrange a time that suits the site.
Read more
Towns and villages near Old Knebworth
What else we do in Old Knebworth
Why it’s worth doing now in Old Knebworth
A partly blocked duct slows the airflow. Less air moves, so heat and smoke stay in the kitchen while the fan strains and grease can drip from duct joints. With notice, the visit to Old Knebworth can be fitted around your bookings and events.
What you pay reflects the actual work. That is why we survey first, from photos or on site, and why the quote is fixed before any work starts.
Why Old Knebworth businesses choose us
- Every visit written up, with pictures
- Accredited under CHAS and SafeContractor, with ISO 9001
- Ventilation hygiene specialists since 2009
- Fixed quotes from a survey or pictures
Take a look at our cost guide and our accreditations.