Greater London · Grease filter exchange
Grease filter exchange in Northwood, Greater London
Need grease filter exchange in Northwood? We survey first, give you a fixed quote and work around your opening hours, then sign off with a report and photos.
- Grease filters clogged with grease
- A canopy running with filters missing
- Grease building up behind the canopy filters
Common problems we fix in Northwood
What a kitchen cooks affects how fast filters clog. Frying, grilling and chargrilling produce far more grease than steaming or baking so no single schedule suits every kitchen.
Any of these means the system needs a check-up:
- Filter washing that keeps being missed
- Smoke and heat lingering under the hood
- Blocked baffle filters
- Hand-washed filters that still look greasy
Kitchens that cook twelve hours or more a day, as some healthcare kitchens do, fall into BESA’s three-monthly minimum; Northwood and Pinner Cottage Hospital is the nearest hospital to Northwood, about 1 mile south.
Comparing quotes
- If they look at the system before pricing
- How areas they can’t reach will be recorded
- Whether a written report and photos are included
- When the next visit should be, and why
Grease filter exchange for kitchens and businesses in Northwood
In Northwood, our filter exchange runs on a schedule set by how much the kitchen cooks. Busy kitchens need changes more often, lighter ones less. We agree the interval with you at the start. The work covers wall canopies, mesh filters and island canopies, and common reasons people get in touch are damaged filters letting grease past and smoke and heat lingering under the hood.
London kitchens are often tucked into basements or the back of a building, with extract ducts that can climb several floors to discharge at roof level. For a kitchen in Northwood, that typically means a longer system to clean and more access panels to plan around.
The sign-off is always in writing: a written report, dated and illustrated with pictures, and for TR19® Grease cleans, a certificate issued through the BESCA VHE portal. It shows what was done and what, if anything, couldn’t be reached.
- Where
- Northwood (HA6)
- Wider area
- Greater London
- Reporting
- Written report with photos
- Quote
- A fixed quote up front
- Working hours
- After hours by arrangement; emergencies any time
- Telephone
- 0345 646 2711
- Page updated
- 30 October 2026
More services for Northwood
Why it’s worth doing now in Northwood
In Northwood, as everywhere, a filter service isn’t a substitute for TR19 cleaning. But clean filters do help the system between cleans and the canopy and plenum stay cleaner. In Northwood, a planned overnight visit is much easier than closing unexpectedly.
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 choose Duct Doctor in Northwood
- In business since 2009
- Every job surveyed first
- Fully insured
- A BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease
Read our cost guide and our accreditations.
Multi-site and managed buildings
The Fire Safety Order 2005 puts the duty to manage fire risk on the responsible person, and that can be the employer, the owner, a landlord, a facilities manager or a managing agent. With shared responsibility, good records help everyone.
Running several sites is easier with one contractor. We cover South East England and London, so visits at different addresses can be planned together and kept on a regular cycle.
In-house cleaning or a specialist?
In-house cleaning and specialist cleaning do different jobs. Wiping filters daily and washing them weekly keeps the visible parts in order, but they do not reach the grease that builds up further in. That part needs specialist access and equipment.
Your own staff can handle the daily basics: wiping canopies, washing grease filters and recording it in a log. What they cannot safely do is clean inside the ductwork, the fan or the risers, and that’s where we come in.
What affects the quote in Northwood
The survey tells us what the work involves. The main factors are:
- When the work can happen, such as evenings, overnight or weekends
- Parking and loading at the site
- One-off work versus a regular cycle
- The condition of the system
When the work has to happen, how we reach it and how big the site is all affect the cost. We take each of them into account and give you a fixed price before we start.
What we need to know
You don’t need the technical terms. It helps if you can send:
- Close-ups of filters, grilles, hatches or access panels
- Where the plant sits or the system leaves the building, such as a roof or outside wall
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
- Your opening hours and when the area is out of use
Need a price for grease filter exchange? Please give us a ring on 0345 646 2711 or drop us a line and tell us about the site. We’ll talk you through the work and give you a fixed quote before you commit to anything.
What we do, step by step
Night work is normal for us. Evenings, nights and weekends are when much of our work happens, so the site can open as normal afterwards. On site, the work takes less than an hour in most kitchens. Expect the work in Northwood to happen after your last customer leaves, not during trading.
- The filters in each canopy are measured and counted.
- We set the interval with you.
- On each visit, we remove the greasy filters.
- Clean filters go in and we check they sit snugly.
- We take the greasy set away and confirm the next date.
Preparing for the visit
- Clear the space around the work
- Agree a time when the area can be out of use
- Mention any parking or loading restrictions
Getting a quote
We don’t publish a price list, because no two systems are the same. Instead, we look at your site first, from photos or a survey, then send a fixed quote. To start, ring 0345 646 2711 or send us an email.
Related advice
What grease filter exchange looks like in Northwood
The FSA’s food hygiene register shows about 51 restaurants, cafés and works canteens and about 26 takeaways and sandwich shops within roughly a mile and a half of the centre of Northwood. Where they cook under a canopy, the grease filters are the first line of defence and clog quickly. Fire safety in Northwood falls to London Fire Brigade. Grease in a kitchen extract is a recognised fire risk, and the fire authority enforces the law on managing it in most commercial premises. In Northwood, food businesses are inspected by environmental health officers from Hillingdon council. An officer looking round a kitchen will see the canopy, and grease there is hard to miss. A dated certificate in the maintenance file answers the question before it’s asked.
School kitchens, at schools like Frithwood Primary School for example, are typically cleaned in the holidays so no lunches are lost. Volunteers running a hall kitchen near Emmanuel Church, or anywhere in Northwood, may not know when the extract was last cleaned, and a grease test settles it.
Northwood is about 3 miles south-east of Rickmansworth, in Greater London. We carry out grease filter exchange for businesses, landlords and public buildings in Northwood and the rest of Greater London. Across Greater London, we cover 764 places, and Northwood is one of them. Our London page covers sites nearby (16 miles or so).
Work in HA6 is surveyed, quoted and booked the same way as anywhere else. We cover sites on Little Stream Close and Sandy Lodge Way and nearby roads. If your site is just outside Northwood, we cover Eastbury (1 mile north-east), Moor Park (1 mile north-west), Batchworth Heath (1 mile west), Batchworth (2 miles north-west) and Holywell (2 miles north). We also work in nearby towns such as City of Westminster (14 miles south-east), Marylebone (14 miles south-east), Kensington (12 miles south-east), St Pancras (14 miles south-east), Hampstead (11 miles south-east) and Ruislip (3 miles south).
What’s near Northwood
In Northwood, that means kitchens and buildings near King George V Playing Fields, The Gate Public House and London School of Theology, among other places. Northwood’s nearest station is Carpenders Park station, about 1.7 miles north-east. Other landmarks nearby include Harlequin Centre (2.9 miles north-east) and Heath Robinson Museum (2.2 miles south-east). The countryside around Northwood includes Dews Farm Sand Pits and Tumbling Bay.
Different parts, different methods
School, care home and staff kitchens
Kitchens that cook for set mealtimes still load their filters, though often more slowly.
The plenum
With good filters, less grease ends up in the plenum, but it still needs cleaning as part of TR19.
Northwood questions
Can you clean school kitchen extracts in Northwood during the holidays?
Yes, and it’s the easiest time to do it. Food Standards Agency records list about 24 schools, colleges and universities with registered kitchens within about a mile and a half of Northwood. You can give us a ring on 0345 646 2711, or email photos with the dates the site is empty.
Can parking be tricky for a job in Northwood?
Parking and loading in London need planning, so tell us about bays, permits and building rules when you book. Night visits tend to make loading easier on London streets.
Are you insured?
Yes. Duct Doctor is fully insured, and the details are available on request.
Can one contract cover all our sites?
Yes. You deal with one contact for every site in our area, with visits on a regular schedule.
Where does the waste go?
It’s contained and taken away. We collect grease, debris and waste water as we go rather than letting it spread.
How long does the visit take?
It depends on the size of the system, but for many sites it takes a short visit, depending on how many filters the canopies hold. We will confirm it with the quote.
Do you offer emergency callouts?
Yes, day and night, every day of the year. Office hours are Monday to Friday, 8am to 6pm, with the emergency line covering every other hour.
What accreditations do you have?
CHAS, SafeContractor, ISO 9001 and BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease. We are fully insured and have been trading since 2009.