Greater London · Air handling unit cleaning
Air handling unit cleaning in South Oxhey, Greater London
One call covers AHU cleaning in South Oxhey: survey, fixed quote, work and sign-off. CHAS and SafeContractor accredited, ISO 9001 and fully insured.
- Odours coming through the supply air
- Debris and leaves in the fresh air intake
- Dirty coils holding back the airflow
AHU cleaning for kitchens and businesses in South Oxhey
Units vary a lot in size, age and layout, from a small ceiling-mounted unit to a large rooftop plant. We look at the unit first, from photos or a site visit, and send you a fixed quote, so you know where you stand. If you have drain trays holding standing water and units needing a clean before a new tenant or handover, we can help.
London buildings tend to keep their plant on the roof or below ground, so work in South Oxhey is often done in the evening or at weekends. Parking and loading are agreed with the building in advance.
Duct Doctor has been trading since 2009, as a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. We also hold CHAS, SafeContractor and ISO 9001, and we are fully insured.
- Where
- South Oxhey (WD19, HA6, HA5)
- Region
- Greater London
- Paperwork
- Written report with pictures
- Quotes
- A fixed quote up front
- When we work
- Out of hours as standard, 24/7 emergency line
- Phone
- 0345 646 2711
- Page updated
- 30 October 2026
How we price AHU cleaning
We don’t publish a price list, because sites vary so much. The quote depends on:
- Site rules, permits and inductions
- Where the site is and how we reach it
- The condition of the system
- When the work can happen, such as evenings, overnight or weekends
No two sites are the same, so we price each one individually. The size of the job, how we reach it, its condition and the working hours all make a difference.
Helping us quote
Photos and a few facts are often enough to price the work. Useful things to send:
- Where the site is and what kind of site it is
- Detail shots of panels, filters and grilles
- Your opening hours and when the area is out of use
- Wide photos of the system and the area around it
Here’s what helps 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, give us a ring on 0345 646 2711 or send us an email.
Your questions about AHU cleaning in South Oxhey
Do you work overnight in South Oxhey?
Yes, nights and weekends are routine for us. The site is handed back ready to open. Your opening times are the first thing we ask for.
Can parking be tricky for a job in South Oxhey?
A loading bay, a visitor permit or off-street space near the site in South Oxhey makes the visit easier to plan. If the building has a loading slot system, we’ll book into it.
How long does it take to clean an air handling unit?
Expect it to take from a few hours for a compact unit to a day or more for a large one. The unit’s size and condition make the biggest difference, and the quote will give you a clear idea.
How often do AHUs need cleaning?
TR19® Air takes a risk-based approach, so it depends on inspection rather than a fixed interval. We recommend a next date in each report.
What does AHU cleaning cost?
Every site is different, so each gets its own fixed quote. For a quote, call us on 0345 646 2711 or email us with the site type, opening hours and a few photos.
What do you do to protect the area?
With sheeting and covers, before anything else happens. The work is kept contained and leave the area clean.
Does the AHU have to be shut down for cleaning?
Yes, while the clean is under way. Out-of-hours work is available so the building is not left without ventilation when it’s busy.
Do you clean the ductwork as well?
Yes. Ductwork is cleaned through access panels, and any sections we can’t reach are noted in the report, and new panels can be fitted.
Do you need AHU cleaning in South Oxhey?
Filters that aren’t changed or cleaned on time clog up, cutting airflow and sometimes letting dirty air bypass them altogether. Then the rest of the unit takes the load.
Common reasons sites call us are:
- Filters that are clogged or overdue
- Fan sections that haven’t been cleaned in years
- Air handling units never cleaned inside
- Odours coming through the supply air
Wherever a school like Greenfields Primary School has ducted ventilation, a half-term visit keeps the work out of lesson time.
Comparing quotes
- Whether inaccessible sections are listed on the report
- Proof of insurance
- Whether a written report and photos are included
- Whether VAT is included
Aftercare tips
Once we have finished, these simple steps help:
- Look at the condensate drain whenever the unit is serviced
- Clear leaves and litter away from the intake
- Report stiff or damaged access doors
- Keep filter changes on time and recorded
The report suggests a date for the next inspection or clean, taking into account how dirty it was. Under TR19® Air the timing is set by inspection and risk, not a fixed calendar.
Do not let leaves, litter or stored materials build up near the fresh air intake. Anything around the intake is likely to be drawn in.
What a clean won’t put right
We’d rather tell you now than book work that won’t help, so these are the things it will not cover:
- Breakdowns that need a mechanical engineer
- Controls and BMS settings that run the unit
- Ventilation that was badly designed in the first place
If you are not sure, just call us on 0345 646 2711, or email photos and we’ll give you a straight answer before you book.
Where we work
- Dampers and louvres
- Drain trays
- Filter sections
- Heating and cooling coils
- Supply and extract fans
- Internal panels
What staff can safely do
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. Reaching it takes a specialist with the right equipment.
For ventilation and air handling systems, in-house care is mostly about checks: keeping grilles clear, noting unusual noise or smells and logging filter changes. The inside of ducts and units needs a specialist.
What happens on the day
The first job on site is protection: sheeting goes over floors and surfaces close to the work. After that, the system is made safe and the work begins. The work on site takes a single shift for a typical unit, longer for large or heavily soiled ones, and the area is cleaned down before we leave. A name and number for whoever controls access to the building in South Oxhey saves time on the night.
- First we agree when the unit can be switched off, including evenings or weekends.
- We take before pictures of each section of the unit.
- We work through the unit from the intake to the outlet.
- The fan and drain tray are cleaned and the drain checked.
- After photos are taken and the certificate issued.
How to prepare
- Let us know when the site is closed or quiet
- Plan for cooking equipment or plant to be off before we arrive
- Clear loose items from the work area
Ask for a quote
Need a price for AHU cleaning? Please phone us on 0345 646 2711 or use the quote form with a few details about the site. We’ll explain what we’d do and send a fixed quote before you commit to anything.
Related advice
Towns and villages near South Oxhey
More services for South Oxhey
Part by part
Fans and fan sections
Build-up on fan blades can upset the balance and add wear. A clean fan runs more smoothly.
Filters
Filter condition tells you a lot about the rest of the unit. They’re photographed before and after for your records.
AHU cleaning around South Oxhey
There are about 18 schools, colleges and universities and about 26 care, childcare and hospital premises on the FSA’s food hygiene register within 1.5 miles or so of the middle of South Oxhey. Many buildings of this kind have supply and extract ductwork that gathers dust and needs inspecting. London plant rooms are often on roofs or in basements reached through occupied floors. South Oxhey’s nearest hospital, Northwood and Pinner Cottage Hospital, is about 1.5 miles south-west. Hospitals show how much a building can rely on its ventilation, and smaller healthcare sites rely on theirs too.
Healthcare ventilation, from large hospitals like Northwood and Pinner Cottage Hospital (about 1.5 miles south-west) to small clinics, depends on clean filters, coils and ducts. If you manage shops or offices close to Carpenders Park station, a TR19® Air inspection shows whether the ductwork needs cleaning.
South Oxhey is about 2 miles north-west of Hatch End, in Greater London. From the centre of South Oxhey to the outskirts, AHU cleaning is available to all kinds of commercial premises, from a single unit to a large public building. South Oxhey is one of 764 towns, villages and districts in Greater London where we work for commercial clients. For sites nearby, see our London page (15 miles or so).
All of WD19, HA6 and HA5 is covered for AHU cleaning, from busy streets to back roads. Whether your site is on Ilkley Road, Benton Road and Oakdale Road or anywhere close by, we can help. Neighbouring places we cover for AHU cleaning include Carpenders Park (1 mile north-east), Watford Heath (1 mile north), Hatch End (2 miles south-east), Headstone (2 miles south-east) and Oxhey (2 miles north). Larger places within reach include London (15 miles south-east), City of Westminster (13 miles south-east), Marylebone (13 miles south-east), Kensington (12 miles south-east), St Pancras (13 miles south-east) and Shoreditch (15 miles south-east).
What’s near South Oxhey
Locally, jobs take us to businesses close to Oxhey Park and Heathrow Aviation Engineering UTC and the streets around them. The closest station to South Oxhey is Carpenders Park station, about 0.6 miles north-east. Other landmarks nearby include Hilfield Castle (3.3 miles north-east) and Heath Robinson Museum (1.9 miles south). Open spaces near South Oxhey include Tumbling Bay and Harrow Weald Common.