Hertfordshire · Ductwork cleaning
Ductwork cleaning in Knebworth, Hertfordshire
Ductwork cleaning for commercial sites in Knebworth and across Hertfordshire. CHAS, SafeContractor and ISO 9001, and fully insured.
- A grease test showing the duct is overdue
- An insurer asking for TR19 evidence
- A rancid smell from the extract duct
What happens on the day
Your staff do not need to do much on the day. A contact on site lets us in at the agreed time and points us to the system, and the rest is down to us. Before we leave, the area is tidied and the paperwork follows. Because the survey comes first, a visit to Knebworth can usually be finished without a second trip.
- We map the duct route and check where the access panels are.
- Set points along the runs are tested for grease.
- Access panels are opened and heavy deposits scraped out by hand.
- The duct is degreased with the method that suits the grease, from degreasers to hot water or steam.
- We test again, take pictures and note any part that couldn’t be reached.
Getting ready for the visit
- Have your last certificate or report to hand
- Tell us about site rules, permits or sign-in
- Plan for cooking equipment or plant to be off before we arrive
Ask for a quote
Photos are enough for some jobs, while others need a look on site. Larger sites, and anything hidden behind walls, ceilings or floors, are normally surveyed first. Either way, you get a fixed price before work begins.
Advice
Ductwork cleaning for kitchens and businesses in Knebworth
Ductwork in Knebworth is cleaned the same thorough way as everywhere else we work: we test the grease first, remove thick deposits by hand and degrease what’s left. Readings are taken again afterwards and pictures go into your report. If you have stale grease odours from the duct and a duct nobody has opened in years, we can help, from horizontal duct runs, vertical risers and attenuators onwards.
Kitchens around a place like Knebworth are often in older buildings or single-storey extensions, where the duct may cross a roof void or climb an outside wall. Long horizontal runs like that hold grease and need access panels to reach.
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 carry full insurance.
- Location
- Knebworth (SG3)
- Wider area
- Hertfordshire
- Reporting
- TR19® certificate and photo report
- Price
- Fixed quote, usually within a working day
- When we work
- Nights, weekends or holidays to suit you
- Phone
- 0345 646 2711
- Page updated
- 30 October 2026
Towns and villages near Knebworth
More services for Knebworth
What affects the cost of ductwork cleaning
There’s no set price list, because sites vary so much. The quote depends on:
- Working hours and out-of-hours timing
- Access, including roofs, risers and ceiling voids
- Where the site is and how we reach it
- The scale of the work
One small site or a whole estate, we price it on the same basis: what needs doing, how we get to it and when. You’ll have a fixed price before any work starts.
What we need to know
When you contact us, these details help:
- Any access panels or hatches you can see
- Where the site is and what kind of site it is
- Problems your staff have spotted
- Wide pictures of the system and the area around it
For ductwork cleaning in Knebworth, call 0345 646 2711 or send us an email. Let us know the site type and the opening hours, plus pictures or the previous report if they’re to hand. A fixed quote normally follows within one working day.
What we’re called out for in Knebworth
Grease filters that don’t seal let fat straight through. More grease reaches the ductwork than it should and it fills faster.
Clients usually contact us when they notice something like this:
- Grease pooling at the foot of the riser
- Gaps where access panels were never fitted
- Ductwork that has never been cleaned
- Smells of old cooking grease from the ductwork
Healthcare kitchens can’t easily close, so their extracts are cleaned overnight or between meal services; the nearest hospital to Knebworth is Lister Hospital, about 4.2 miles north.
What to look for in a quote
- What happens if part of the system cannot be accessed
- How VAT is shown on the quote
- Whether the work can be done while the site is closed
- If the quote is a fixed price or an estimate
Honest limits
Before you book, it helps to know what’s not included:
- Faulty fire dampers
- Sections that can’t be reached safely without new access (those are recorded, and panels can be fitted)
- Duct sections that need replacing
If in doubt, call us on 0345 646 2711, or email photos and we will say what we think before you book.
Where we work
- Bends and junctions
- Multi-storey ducts
- Horizontal duct runs
- Attenuators
- Access panels
- Vertical risers
Kitchen extracts in Knebworth
Food Standards Agency records include about 14 pubs and bars within 1.5 miles or so of the middle of Knebworth. A pub or hotel kitchen that cooks every day builds up grease in its extract like any other. In Knebworth, food businesses are inspected by environmental health officers from North Hertfordshire council. 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. Knebworth 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.
Church and community hall kitchens, near Church of St Martin or anywhere around Knebworth, are easy to forget, but their extracts collect grease like any other. If you look after a school kitchen, at a school such as Knebworth Primary and Nursery School or anywhere near Knebworth, the holidays are the usual time for a TR19® clean.
Knebworth is about 3 miles south of Stevenage, in Hertfordshire. Whether your site is in the middle of Knebworth or further out, we cover ductwork cleaning for every kind of premises, from a single unit to a large public building. We cover 381 places across Hertfordshire, from busy centres to quieter spots. You can also see our page for London, roughly 26 miles from Knebworth.
We work across the SG3 postcode area for ductwork cleaning and the streets around it. That includes premises on London Road, Deanscroft and Lytton Fields and nearby roads. Neighbouring places we cover for ductwork cleaning include Woolmer Green (1 mile south), Bragbury End (1 mile north-east), Oaklands (2 miles south), Datchworth (2 miles south-east) and Shephall (2 miles north). Further out, we also cover Hemel Hempstead (14 miles south-west), Stevenage (3 miles north), St Albans (10 miles south-west), Bishop's Stortford (15 miles east), Welwyn Garden City (5 miles south) and Harpenden (8 miles south-west).
Near you in Knebworth
Typical jobs here are in premises near Barnwell School and Knebworth Park and the streets around them. Knebworth has its own railway station: Knebworth station. Well-known places in the area include Benington Castle (3.6 miles north-east) and Datchworth Museum (1.7 miles south-east). Open spaces near Knebworth include Mardley Heath.
What staff can safely do
Staff cleaning and specialist work aren’t the same thing. Wiping filters daily and washing them weekly keeps the visible parts in order, but they don’t reach the grease that builds up further in. Reaching it takes a specialist with the right equipment.
Staff cleaning doesn’t replace a specialist visit; it supports it. Regular in-house cleaning slows the build-up, but the parts you can’t see still need a specialist at the right interval.
Why deal with it now?
Booking the duct clean in Knebworth now keeps it a planned job. The work takes anything from a few hours to several visits, depending on the length of duct, done out of hours so the kitchen keeps cooking. A quieter site near Knebworth still needs its system looked after.
No two sites are the same, so each one gets its own fixed quote. The size of the job, how we reach it, its condition and the working hours all play a part.
Why book with us
- A written report with pictures after each visit
- One contact for all your sites in London and the South East
- Member of BESCA Vent Hygiene Elite, cleaning to BESA TR19® Grease
- Work around your opening hours, with 24/7 emergency cover
FAQs for Knebworth
Do you work at weekends in Knebworth?
Yes, we can come after you close and finish before you open. That way a site in Knebworth doesn’t have to lose a day’s trading. Tell us your opening hours when you ask for a quote.
Who would carry out a food hygiene inspection at a kitchen in Knebworth?
Kitchens in Knebworth are inspected by North Hertfordshire council’s environmental health officers. How often a business is inspected depends on the risk rating the council gives it, so it’s worth staying ready all year.
How far ahead should we book?
For planned work, earlier is better, particularly if your next visit is nearly due. Emergencies are different, because our line is open 24/7.
Which accreditations do you hold?
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.
Can extra access doors be added to the duct?
Yes, extra panels can be fitted. That lets the next clean reach sections that were missed, and the report will show where they’re needed.
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.
Is TR19 a legal requirement?
Not in itself. Insurers, fire officers and EHOs look to TR19® as the benchmark, and many insurance policies ask for proof of TR19® cleaning. The legal duty sits in the Regulatory Reform (Fire Safety) Order 2005 in England and Wales.
How do you protect the area?
We cover floors and nearby surfaces with sheeting before work begins, and anything we remove is contained. Before we leave, we tidy up and clean down.
Landlords, agents and facilities managers
We regularly work with managing agents. Tell us the site, the work and the access arrangements, and we will send a fixed quote.
We work for landlords, managing agents and facilities managers as well as the people running the site. Where a system serves more than one tenant, such as a shared riser, it helps to agree who arranges the work, and we’re happy to quote for all of it.