Greater London · Air handling unit cleaning
AHU Cleaning in The Wrythe
AHU cleaning across The Wrythe and nearby, booked around your opening hours and signed off in writing with pictures.
- Dirty filters cutting the airflow
- Rooms that smell stuffy when the system runs
- Units that have only ever had filter changes
About our AHU cleaning in The Wrythe
We clean air handling units for buildings in The Wrythe and across Greater London, working to TR19® Air, in offices, schools, hospitals, care homes and retail. The work is timed around when the system can be switched off, including evenings, nights and weekends. Common call-outs are for fan sections that haven’t been cleaned in years and odours coming through the supply air, across filter sections, supply and extract fans and heating and cooling coils.
London offices and flats often have ductwork added through successive refits, leaving sections that are hard to reach and seldom cleaned. In The Wrythe, as elsewhere, cleaning starts with an inspection of what’s there.
It’s worth checking any contractor’s accreditations. Ours are BESCA Vent Hygiene Elite membership, cleaning to BESA TR19® Grease, plus CHAS, SafeContractor and ISO 9001, with full insurance on top.
- Where
- The Wrythe (SM5, SM6, SM1)
- Wider area
- Greater London
- Paperwork
- Report and pictures after the visit
- Price
- Fixed quote, typically within a working day
- Hours
- Evenings, overnight and weekends; 24/7 emergencies
- Telephone
- 0345 646 2711
- Page updated
- 30 October 2026
Between visits
A little care between visits keeps the system in better shape. Our advice:
- Keep the area around the fresh air intake clear
- Keep filter changes on time and recorded
- Look at the condensate drain whenever the unit is serviced
- Store the TR19 paperwork where auditors can find it
The report suggests a date for the next inspection or clean, based on what we found. Under TR19® Air the timing is set by inspection and risk, not a fixed calendar.
Keep the unit’s doors and panels in working order. If a section is hard to get into, it tends not to get checked.
What your team can do, and what needs us
Logging matters as much as cleaning. A dated log of in-house cleaning and checks shows an inspector that the system is looked after between visits, alongside our reports.
For ventilation and air handling systems, in-house care is mostly about checks: clear grilles, a log of filter changes and reporting anything odd. The inside of ducts and units needs a specialist.
How it works
Every visit runs to the same pattern: protect the area, isolate whatever needs isolating, do the work, tidy up and hand over the paperwork. The visit itself takes a single shift for a typical unit, longer for large or heavily soiled ones. A name and number for whoever controls access to the building in The Wrythe 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.
- Drain trays are cleared and cleaned and the outlet checked.
- We close up the unit and send the certificate and before and after photos.
Before we arrive
- Mention any sign-in, permit or induction we need
- Make sure someone can let us in and lock up afterwards
- Find the previous report, if there is one
How to get a quote
Some systems can be priced from pictures; others need a survey. Big or complicated sites, and systems that are hard to see in photos, get a survey first. Either way, you get a fixed price before work begins.
Related advice
What the work involves, part by part
Drain trays
Condensate from the coil drips into a tray beneath it. Standing water and slime are removed and the outlet is checked.
Filters
Dirty filters cut airflow and let dirt slip past their frames. We clean the frames and rails so the filters sit tight.
Common questions in The Wrythe
Do you work at weekends in The Wrythe?
Yes. We work evenings, overnight and at weekends. Your customers, staff or residents in The Wrythe needn’t be disturbed. Let us know the hours you’re closed and we will book within them.
Does London parking affect a job in The Wrythe?
Parking and loading in London need planning, so tell us about bays, permits and building rules when you book. Much of our London work is done overnight, which helps.
What accreditations do you have?
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.
Is The Wrythe in your area?
Yes. We cover The Wrythe and across Greater London, within our South East and London area. To book, call us on 0345 646 2711 or use the quote form.
What’s included in an AHU clean?
The main parts are the filters, coils, drain tray, fan and inside of the casing. The survey confirms what’s in your unit before we quote.
Can you fix a faulty AHU?
We clean the unit and flag faults rather than repair them, with the details in the report.
Do you have insurance?
Yes. Full insurance covers our work, and we have been trading since 2009.
How often should an air handling unit be cleaned?
That is set by inspection, in line with TR19® Air. A hard-working unit, or one serving a hospital or care home, may need cleaning more often.
Signs you need AHU cleaning in The Wrythe
Most units live out of sight on roofs, in plant rooms or in ceiling voids, so they’re easy to forget about. Months can pass without anyone looking inside.
Keep an eye out for any of the following:
- Odours coming through the supply air
- Dust-coated heating and cooling coils
- Drain trays holding standing water
- Dirty fans and fan housings
Wherever a school like Victor Seymour Infants' School has ducted ventilation, a half-term visit keeps the work out of lesson time.
What to look for in a quote
- If the quote is a fixed price or an estimate
- What insurance they carry
- How areas they cannot reach will be recorded
- What’s included in the scope, part by part
Places near The Wrythe
Other services in The Wrythe
What a clean will not put right
A few issues sit outside what this work can do:
- Controls and BMS settings that run the unit
- Mechanical faults with motors, belts or bearings
- Coils that are corroded or leaking and need replacing
Not sure which it is? You can call us on 0345 646 2711 or drop us a line and we will tell you honestly.
Where we work
- Heating and cooling coils
- Internal panels
- Drain trays
- Dampers and louvres
- Filter sections
- Supply and extract fans
AHU cleaning around The Wrythe
Food Standards Agency data includes about 30 schools, colleges and universities and about 59 caring premises (care homes, nurseries and hospitals) within about 1.5 miles of central The Wrythe. Many buildings of this kind have supply and extract ductwork that gathers dust and needs inspecting. About 0.9 miles north-west of The Wrythe is St Helier Hospital, the nearest hospital. If you run a surgery, clinic or care home, your ventilation deserves the same care as a hospital’s, on a smaller scale. Getting kit to a London plant room normally means lifts, stairs and an agreed loading slot.
Hospitals such as St Helier Hospital (about 0.9 miles north-west) show how much a building can rely on clean ventilation, and smaller healthcare sites near The Wrythe are no different. If you manage shops or offices close to Carshalton station, a TR19® Air inspection shows whether the ductwork needs cleaning.
The Wrythe is about 7 miles south of Stockwell, in Greater London. We provide AHU cleaning for businesses, landlords and public buildings in The Wrythe and the rest of Greater London. The Wrythe is one of 764 towns, villages and districts in Greater London we cover for AHU cleaning. For sites nearby, see our London page, about 9 miles away.
Work in SM5, SM6 and SM1 follows the same survey, fixed quote and written report as everywhere else we cover. If you need AHU cleaning at premises on Elm Road, Byne Road and Mill Lane or a nearby road, our technicians can take on the work. Neighbouring places we cover for AHU cleaning include Carshalton (1 mile south), Wallington (1 mile south-east), Rosehill (1 mile north-west), St Helier (1 mile north-west) and Benhilton (1 mile west). We also work in nearby towns such as London (9 miles north), City of Westminster (10 miles north), Marylebone (10 miles north), Kensington (9 miles north), St Pancras (11 miles north) and Shoreditch (11 miles north).
Around The Wrythe
Typical jobs here are in premises near Carshalton Park, The Railway Tavern and Carshalton High School for Girls. The Wrythe has its own railway station: Carshalton station. Well-known places in the area include Centrale Croydon (2.7 miles east) and Honeywood Museum (0.6 miles south). Not far away are The Spinney Local Nature Reserve and Duppas Hill.
What affects the quote in The Wrythe
Before we fix a price, we need to know a few things. We look at:
- How many systems or sites are involved
- How easy every part is to reach
- Parking and loading at the site
- The condition we find in the survey
Leaving it longer rarely makes the work cheaper. Problems in a system tend to grow, which can make the next visit longer. If you are unsure, give us a ring on 0345 646 2711, or send details by email and we will give you an honest view and a fixed quote.
Asking for a quote
A few details help us quote accurately. With your enquiry, please include:
- A few general shots of the system
- When the site is open and when it’s quiet
- Where the site is and what kind of site it is
- Any access panels or hatches you can see
To get a fixed quote, phone us on 0345 646 2711 or send us an email and tell us the type of site, your opening hours and roughly what the system looks like. A few pictures and your last certificate or report help a lot. You will typically have a quote within one working day.