Thurrock · Air handling unit cleaning
Biggin AHU cleaning
AHU cleaning for businesses, landlords and public buildings in Biggin. CHAS, SafeContractor and ISO 9001, and fully insured.
- Debris and leaves in the fresh air intake
- Rooms that smell stuffy when the system runs
- Filters that are clogged or overdue
Looking after it afterwards
Results last longer with the right care. Here’s what we suggest:
- Keep the area around the fresh air intake clear
- Look at the condensate drain whenever the unit is serviced
- Make sure the unit’s access doors open easily
- Report water on the plant room floor
The ducts served by the unit may need attention too. A clean unit feeding dirty ducts only solves half the problem, and we can survey both.
Regular filter changes are the best protection an AHU has. Overloaded filters let more dirt through to the coils and fan.
About our AHU cleaning in Biggin
The fan pushes every bit of air in the system, so dust on its blades and housing ends up in the airstream. We clean the fan section along with the rest of the unit, once the unit has been shut down and isolated. The work covers supply and extract fans, heating and cooling coils and internal panels, and people most often call us about plant that needs cleaning after a refit and air handling units with blocked filters.
Rural buildings with mechanical ventilation, such as care homes and country hotels, often keep their units in roof spaces or outbuildings, which makes them easy to overlook.
Duct Doctor has been trading since 2009, as a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease. CHAS, SafeContractor and ISO 9001 are in place too, and we carry full insurance.
- Where
- Biggin (RM16)
- Region
- Thurrock
- Records
- Photo report after each visit
- Price
- A fixed quote up front
- Hours
- Out of hours as standard, 24/7 emergency line
- Phone
- 0345 646 2711
- Page updated
- 30 October 2026
Biggin questions
Can you work in Biggin outside opening hours?
Yes, out-of-hours work is a big part of what we do. Your customers, staff or residents in Biggin needn’t be disturbed. Let us know the hours you’re closed and we will book within them.
Can a school’s ventilation in Biggin be done out of term time?
Yes. Half-terms and the summer break are the natural time for school work. Food Standards Agency records list about 12 schools, colleges and universities with registered kitchens within about a mile and a half of Biggin. Send us your term dates when you call 0345 646 2711 or drop us a line, and we will fit the work in.
Will you repair the fan or motor?
We clean the unit and flag faults rather than repair them, with the details in the report.
What if parts of the system can’t be reached?
Anything we cannot reach goes on the report, with photos where possible, and we tell you what would make it reachable, for example new access panels.
Do you have a 24/7 line?
Yes. There’s a 24/7 emergency line for anything that cannot wait until a planned visit. Ring any time and tell us what’s happened.
Where does the waste go?
We take it away when we go. While we work, it’s kept contained so the area stays clean.
How much notice do you need?
Earlier is better, especially for out-of-hours work. We normally quote within one working day, and there’s a 24/7 line for emergencies.
What do you do to protect the area?
We start with protection: sheeting over floors, worktops and anything close to the work. We tidy up and take our waste away before we leave.
Part by part
Drain trays
Standing water in a tray sits right where the air passes. We clean it and report anything about the tray or drain that needs fixing.
Rooftop and plant room units
Units outside are exposed to weather and windblown debris. We clean the intake and first stage of filters along with the rest.
Common problems we fix in Biggin
Cooling coils create condensation, and that water has to go somewhere. If the drain tray outlet blocks or the tray does not fall properly, water stands in it, and slime and smells soon follow.
These are the problems we see most often:
- Fan sections that haven’t been cleaned in years
- Intake sections clogged with outdoor debris
- Coils clogged with dust and debris
- Air handling units never cleaned inside
If you manage a school such as Tilbury Pioneer Academy, ventilation cleaning is best booked for the holidays.
Comparing quotes
- Whether the work can be done while the site is closed
- What insurance they carry
- If they look at the system before pricing
- Whether inaccessible sections are listed on the report
How it works
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 a single shift for a typical unit, longer for large or heavily soiled ones. Visits to a village like Biggin are booked in advance, at a time that suits whoever runs the site.
- First we agree when the unit can be switched off, including evenings or weekends.
- We take before pictures of each section of the unit.
- Filters, coils and internal surfaces are cleaned from intake to discharge.
- We finish with the fan section and the drain tray.
- We take after pictures and issue the certificate and report.
Getting ready for the visit
- Move anything stored near the system
- Mention any locked doors, roof access or ceiling voids
- Mention any sign-in, permit or induction we need
How to get a quote
For AHU cleaning in Biggin, call 0345 646 2711, or email photos. Tell us what kind of premises it is and when it’s open, and send photos or your last report if you can. A fixed quote usually follows within one working day.
Read more
What your team can do, and what needs us
Away from the kitchen, the in-house job is mainly checking: keeping grilles clear, noting unusual noise or smells and logging filter changes. The inside of ducts and units needs a specialist.
When your team notices a problem between visits, like drips, unusual noise, smells or damaged filters, they should report it rather than try to fix it. We’ll take a look and send you a fixed quote.
Places near Biggin
Other services in Biggin
What happens if it’s left?
Dirty coils and fans make the unit strain to move the same air. That means more wear on the motor and rooms that feel less fresh, and a planned clean is far less disruptive than a breakdown. Equipment tucked in a roof space or outbuilding near Biggin rarely gets looked at unless someone books it.
The price reflects the work, not guesswork. That is why every job is surveyed first, and the price is agreed before work begins.
What you get with us
- CHAS and SafeContractor accredited, with ISO 9001
- One contact for all your sites in London and the South East
- Member of BESCA Vent Hygiene Elite, cleaning to BESA TR19® Grease
- We are fully insured
Take a look at our cost guide and our accreditations.
Ventilation in Biggin buildings
Food Standards Agency data includes about 12 schools, colleges and universities and about 11 care, childcare and hospital premises in Biggin and the streets around it, up to about 1.5 miles out. Where buildings like these have air handling units, filters, coils and drain trays need regular attention. At about 20 miles from central London, Biggin sits well inside the area we cover. A survey and a fixed quote come first, then the visit at a time that suits you. Biggin’s nearest hospital, Gravesham Community Hospital, is about 2.2 miles south. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients.
Healthcare ventilation, from large hospitals like Gravesham Community Hospital (about 2.2 miles south) to small clinics, depends on clean filters, coils and ducts.
Biggin is about 2 miles east of Grays, in Thurrock. Biggin gets the same approach as every site we work on: a survey first, a fixed quote, work timed around your hours and a report with pictures. Biggin is one of 26 places in Thurrock where we work for commercial clients. There’s also a page for Maidstone, roughly 16 miles from Biggin.
AHU cleaning in RM16 is surveyed, quoted and booked the same way as anywhere else. We also cover the places around Biggin: West Tilbury (1 mile east), Chadwell St Mary (1 mile north), Tilbury (1 mile south-west), Orsett Heath (1 mile north-west) and Little Thurrock (2 miles north-west). We also work in nearby towns such as Stanford-le-Hope (4 miles north-east), South Ockendon (5 miles north-west), Balstonia (4 miles north-east), Corringham (5 miles north-east), Aveley (6 miles west) and South Stifford (3 miles west).
Near you in Biggin
We work in commercial kitchens and buildings around Thurrock and Basildon College, The Kings Head pub and The Gateway Academy. The closest station to Biggin is Tilbury Town station, about 1.2 miles south-west of the centre. A little further out are Gravesham Community Hospital (2.2 miles south) and Walton Hall Museum (2.1 miles north-east). Green spaces nearby include Thurrock Thameside Nature Park and Sawyers Lake.
What affects the cost of AHU cleaning
The diagnosis comes before the price. The main factors are:
- How easy every part is to reach
- A single visit or a regular plan
- Working hours and out-of-hours timing
- Whether several sites go on one quote
One small site or a whole estate, we price it on the same basis: the work involved, the access and the timing. The price is fixed before we start.
What to send for a quote
We can often survey from pictures. Try to include:
- Your opening hours and when the area is out of use
- A few general shots of the system
- How we’d reach plant on a roof or in a plant room
- The postcode and the type of business
Some systems can be priced from photos; others need a survey. Larger sites, and anything hidden behind walls, ceilings or floors, are normally surveyed first. Either way, the quote is fixed before any work is booked.