Greater London · Air handling unit cleaning
Air handling unit cleaning in Wallington, Greater London
One call covers cleaning of air handling units, including filters, coils, drain trays, fans and internal surfaces in Wallington: survey, fixed quote, work and sign-off. Fully insured, with CHAS, SafeContractor and ISO 9001.
- Units that have only ever had filter changes
- Dirty filters cutting the airflow
- Dirty coils holding back the airflow
Staff cleaning versus specialist work
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 down canopy surfaces, cleaning filters and keeping a simple log. What they can’t safely do is clean inside the ductwork, the fan or the risers, which is where we come in.
About our AHU cleaning in Wallington
We clean the parts of the unit where dirt and moisture gather: filters, coils, drain trays, fans and the internal panels. Every clean comes with a TR19® certificate and before and after photos in a report. The work covers internal panels, filter sections and heating and cooling coils, and the jobs we see most are dust built up on fan impellers and air handling units due a clean after building work.
Across London, offices, hotels, schools and healthcare buildings rely on mechanical ventilation, much of it supplied through air handling units on roofs or in basements. In a building in Wallington, dust and debris build up in the units and ductwork over time.
For insurers and inspectors, the record counts. That is why every job is written up in a report with photos, and grease extract cleans come with a TR19® certificate issued through the BESCA Vent Hygiene Elite portal.
- Location
- Wallington (SM6, SM5)
- Region
- Greater London
- Records
- Report and photos after the visit
- Quotes
- A fixed quote up front
- Working hours
- Out of hours as standard, 24/7 emergency line
- Telephone
- 0345 646 2711
- Reviewed
- 30 October 2026
How the visit works
We turn up at the time agreed with you, which is often after service, overnight or at a weekend. Anything that needs to be off for the work is switched off and left to cool before any work starts, and floors and nearby surfaces are sheeted. The work itself takes one overnight shift for many single units, with bigger plant phased. A name and number for whoever controls access to the building in Wallington saves time on the night.
- First the unit is surveyed, from photos or a visit, and the scope agreed.
- The unit is shut down with your site team and the area protected.
- We clean or change the filters as agreed, then clean the coils, fan and internal panels.
- We clean out the drain tray and make sure it drains.
- We close up the unit and send the certificate and before and after pictures.
Preparing for the visit
- Have your last certificate or report to hand
- Make sure equipment near the work can be switched off and left to cool
- Clear the space around the work
Ask for a quote
We do not publish a price list, because every site is different. We look at your system first, from photos or on a visit, and then give you a fixed quote. To start, call us on 0345 646 2711 or drop us a line.
Advice
Why it’s worth doing now in Wallington
Leave an AHU uncleaned and the dirt does not stay put. It moves on into the ductwork and out into the rooms, which is why the unit and the ducts are best cleaned together. A booked night’s work in Wallington costs you no trading time; an unplanned closure does.
Kitchens, offices, schools and hospitals are all priced the same way: how much there is, how we reach it, what state it’s in and when we can work. Call for a fixed quote and we’ll explain each part.
Why choose Duct Doctor in Wallington
- Member of BESCA Vent Hygiene Elite, cleaning to BESA TR19® Grease
- We diagnose before we treat
- Out-of-hours work and a 24/7 emergency line
- CHAS and SafeContractor accredited, with ISO 9001
Read how cleaning jobs are priced or how to check a contractor.
Common problems we fix in Wallington
An AHU’s intake draws in outdoor air and everything in it: dust, pollen, leaves and debris. Most of it lands at the intake and the first stage of filters, and the finer material travels on.
Most sites get in touch when they notice one of these:
- Odours coming through the supply air
- Condensate trays that won’t empty
- Air handling units due a clean after building work
- Leaves and litter drawn into the unit
School buildings such as Holy Trinity CofE Junior School are normally done in the holidays, so classrooms aren’t disturbed.
Comparing quotes
- What happens if part of the system cannot be accessed
- Whether they recommend a next date
- What paperwork you get at the end
- Whether a survey comes first
Wallington questions
Is parking a problem for work in Wallington?
Parking and loading in London need planning, so tell us about bays, permits and building rules when you book. Working overnight, as we often do in London, normally makes it simpler.
Can you work in Wallington outside opening hours?
Yes. We work evenings, overnight and at weekends. That way a site in Wallington does not have to lose a day’s trading. Tell us your opening hours when you ask for a quote.
Will we get paperwork for the AHU clean?
Yes. You receive a certificate and a report showing each section before and after, with any faults we noticed.
Where does the waste go?
We take it away at the end of the visit. While we work, it’s kept contained so the area stays clean.
Do you survey before quoting?
Yes, always. We diagnose before we treat: the survey tells us what the system needs and how to reach it and the fixed quote is built on it.
Do you work with multi-site operators?
Yes. One number covers all your sites across London and the South East, and visits can be set on a regular cycle.
How much notice do you need?
Earlier is better, particularly for night and weekend visits. Quotes usually come back within one working day, and emergencies are covered by our 24/7 line.
Which kinds of sites do you work on?
Any commercial site with kitchens or ventilation, from a small pub to a hospital. We work with hotels, schools, care homes, offices, retail and leisure sites.
For landlords and multi-site operators
Landlords, managing agents and facilities managers book us, not only the businesses that use the systems. Shared systems, like a riser serving several units, need a clear agreement on who books the work, and we can quote for the whole system.
Multi-site operators often want one contractor and one number. We work across London and the South East, so a run of sites can go into one programme and kept to a regular schedule.
Looking after it afterwards
Simple habits between visits make a real difference. Our advice:
- Store the TR19 paperwork where auditors can find it
- Look at the condensate drain whenever the unit is serviced
- Book the next check in line with the report
- Flag stale or damp smells in the supply air
The report shows each section of the unit before and after, and note any part we couldn’t get to. It also notes faults we spotted, such as damaged panels or a blocked drain.
Regular filter changes are the best protection an AHU has. Once filters clog, dirt starts getting past them.
Ventilation in Wallington buildings
There are about 35 schools, colleges and universities, about 66 hospitals, care homes and childcare premises and about 4 hotels and guest houses on the FSA’s food hygiene register in Wallington and the streets around it, up to about 1.5 miles out. Many buildings of this kind have supply and extract ductwork that gathers dust and needs inspecting. Ventilation cleaning in London buildings is usually planned for evenings or weekends. For Wallington, the closest hospital is Queen Mary's Hospital For Children, roughly 1.4 miles south-west. Hospitals show how much a building can rely on its ventilation, and smaller healthcare sites rely on theirs too.
Healthcare buildings such as Queen Mary's Hospital For Children, about 1.4 miles south-west, depend on their ventilation; if you manage a surgery, clinic or care home near Wallington, yours matters too. For workplaces around Wallington station with mechanical ventilation, cleaning can be done in the evening or at weekends.
Wallington is about 2 miles west of Croydon, in Greater London. Wherever you are in the SM6 postcode area, we can take on AHU cleaning. Wallington is one of 764 towns, villages and districts in Greater London we cover for commercial clients. There’s also a page for London, about 10 miles away.
We cover every part of SM6 and SM5 for AHU cleaning and the roads nearby. We cover sites on Wallington Square, London Road and Maldon Road and the roads around them. With the A237 and B271 close by, Wallington is easy for our technicians to reach at any hour. Nearby, we also carry out AHU cleaning in Bandonhill (1 mile east), Carshalton (1 mile west), Beddington (1 mile north-east), The Wrythe (1 mile north-west) and Roundshaw (1 mile south-east). Within a short drive, we also cover London (10 miles north), City of Westminster (10 miles north), Marylebone (11 miles north), Kensington (10 miles north), St Pancras (11 miles north) and Shoreditch (12 miles north).
Around Wallington
Locally, jobs take us to businesses close to Carshalton Park, Dukes Head Public House and Wallington County Grammar School. Wallington has its own railway station: Wallington station. A little further out are Honeywood Museum (0.6 miles west) and Centrale Croydon (2.2 miles east). For a walk, there’s Sutton Ecology Centre Grounds and Duppas Hill.
What affects the quote in Wallington
The quote reflects the site in front of us. We take into account:
- Whether we need access equipment or extra panels
- Travel, parking and unloading
- What state the system is in
- Any permits to work or inductions
What you pay reflects the actual work. That’s why we survey first, from pictures or on site, and the price is agreed before we start.
What to send for a quote
A few details help us quote accurately. With your enquiry, please include:
- Where the plant sits or the system leaves the building, such as a roof or outside wall
- Close-ups of filters, grilles, hatches or access panels
- The postcode and the type of business
- Problems your staff have spotted
Quoting starts with a diagnosis, from your pictures and details or, where that is not enough, a survey on site. After that, you get a fixed price for the work, before work begins.