Surrey · Air handling unit cleaning
AHU Cleaning in Blackbrook
Cleaning of air handling units, including filters, coils, drain trays, fans and internal surfaces for commercial sites in Blackbrook and across Surrey. CHAS, SafeContractor and ISO 9001, and fully insured.
- Air handling units due a clean after building work
- Fan sections that haven’t been cleaned in years
- Units that have only ever had filter changes
Blackbrook: your questions answered
Do you work overnight in Blackbrook?
Yes, we can come after you close and finish before you open. Your customers, staff or residents in Blackbrook needn’t be disturbed. When you phone us on 0345 646 2711 or use the quote form, mention when the site is quiet.
Is Blackbrook within the area you cover?
Yes, we work in villages as well as towns, and Blackbrook is covered. Let us know about access, parking and anything unusual about getting there when you book.
How often should an air handling unit be cleaned?
There’s no single answer; it comes down to the building and the unit. Regular inspection shows when it’s due, and we will suggest an interval after the first clean.
What does AHU cleaning cost?
Size, condition, access and working hours all affect the cost. Ask us for a fixed quote, normally ready within one working day.
Can you fix a faulty AHU?
The clean includes noting faults, but repairs sit with your maintenance contractor, with pictures where it helps.
How long does it take to clean an air handling unit?
The work takes half a day to a full day per unit, with large plant planned over several shifts. Bigger units can be phased, and you can call 0345 646 2711 or use the quote form to plan it.
What if parts of the system cannot be reached?
We never leave them off the paperwork. You’ll know exactly which parts weren’t reached and why, along with a quote to put access in.
Do you look at the system first?
Yes. Every job is surveyed first, from your pictures and details, or with a visit where needed. A fixed quote follows.
About our AHU cleaning in Blackbrook
A cooling coil drips condensate into a tray that should drain away. When the drain blocks, water sits there and the tray turns slimy, right in the path of the air going into the building. Cleaning and clearing it is a key part of the job. The work covers supply and extract fans, heating and cooling coils and dampers and louvres, and people most often call us about air handling units never cleaned inside and filters that are clogged or overdue.
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.
Think of the report as the system’s health record: dated, with pictures, and showing what was done. Grease extract cleans are also certificated to TR19® Grease through the BESCA VHE portal, ready for your insurer.
- Where
- Blackbrook (RH5)
- Region
- Surrey
- Reporting
- Photo report after every visit
- Quote
- A fixed price before work begins
- Hours
- After hours by arrangement; emergencies any time
- Phone
- 0345 646 2711
- Reviewed
- 30 October 2026
How we price AHU cleaning
You will get a fixed price before any work starts. It takes into account:
- How big the system is
- A single visit or a regular plan
- Site requirements such as sign-in and permits
- Parking and loading at the site
Kitchens, offices, schools and hospitals are all priced the same way: the size of the job, access, condition and working hours. Call for a fixed quote and we will go through it with you.
Asking for a quote
When you contact us, it’s useful to have:
- The postcode and the type of business
- Where the plant sits or the system leaves the building, such as a roof or outside wall
- The paperwork from the last visit, if you have it
- The times we could work without disrupting the site
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 get going, ring 0345 646 2711, or send details by email.
Keeping the system healthy
A little care between visits keeps the system in better shape. We recommend:
- Store the TR19 paperwork where auditors can find it
- Do not store bins or materials near the intake
- Report musty smells from the vents right away
- Diary the inspection date recommended in the report
Restart the unit with your site team or maintenance contractor once we have finished. Keep an eye on the condensate drain over the next few days to confirm water is draining away.
Keep the unit’s doors and panels in working order. Sections that are awkward to open are the ones that get skipped.
What happens on the day
We start by comparing what we find with the survey or your pictures. Anything unexpected is raised with you before we go further. After that, the work takes half a day to a full day per unit, with large plant planned over several shifts. If the van will struggle with a lane or gateway near Blackbrook, let us know and we’ll plan around it.
- First we agree when the unit can be switched off, including evenings or weekends.
- Before cleaning, each section is photographed.
- Filters, coils and internal surfaces are cleaned from intake to discharge.
- The fan and drain tray are cleaned and the drain checked.
- We take after pictures and issue the certificate and report.
How to prepare
- Let us know when the site is closed or quiet
- Clear loose items from the work area
- Tell us about site rules, permits or sign-in
How to get a quote
Photos are the quickest way to a quote: wide shots of the system, close-ups of anything that worries you and how we’d get to it. Tell us what kind of site it is and when it’s open, and we can price many jobs without a visit.
Read more
Part by part
Filters
Clogged filters reduce airflow, and dirt can get round the edges. We clean the frames and rails so the filters sit tight.
Internal casing and panels
Loose or damaged linings inside a unit can break up into the airstream. We note any we find in the report.
Why act early in Blackbrook
Cleaning a unit while it only has light dust is quick. Years of build-up make the job longer and harder, particularly where damp has made it stick. In a place like Blackbrook, ductwork and fans are easy to forget until something goes wrong.
Every site is different, so each one gets its own fixed quote. Size, access, the condition of the system and when we can work all make a difference.
Why book with us
- One number for every site across the South East and London
- A fixed price before any work starts
- Photo reports with every job
- CHAS and SafeContractor accredited, with ISO 9001
Take a look at how cleaning jobs are priced and how to check a contractor.
Staff cleaning versus specialist work
Some jobs should never be done in-house: entering ducts, working on fans, testing dampers and taking grease readings call for the right kit, training and safe access. That’s our job.
In-house cleaning and specialist cleaning do different jobs. Wiping filters daily and washing them weekly keeps the visible parts in order, but grease that has passed the filters is out of reach. Reaching it takes a specialist with the right equipment.
What we’re called out for in Blackbrook
An overdue filter loads up with dirt, cutting airflow and sometimes letting dirty air bypass them altogether. After that, the coils and fan collect what the filter should have caught.
What we’re most often called out for:
- Debris and leaves in the fresh air intake
- Dirty fans and fan housings
- Dirty coils holding back the airflow
- Stale or musty smells from the ventilation
Healthcare buildings such as Headley Court, about 5.9 miles north, depend on their ventilation; if you manage a surgery, clinic or care home near Blackbrook, yours matters too.
Comparing quotes
- Proof of insurance
- How they set the interval to the next visit
- Whether the whole system is included, or only the parts that are easy to reach
- Whether inaccessible sections are listed on the report
Blackbrook buildings and their air
There are about 3 care, childcare and hospital premises on the FSA’s food hygiene register within about 1.5 miles of central Blackbrook. Many buildings of this kind have supply and extract ductwork that gathers dust and needs inspecting. For Blackbrook, the closest hospital is Headley Court, roughly 5.9 miles north. Healthcare ventilation is a good example of why supply ducts need inspecting: the air goes straight to patients. About 22 miles out from central London, Blackbrook is part of the South East area we work across. Visits are booked around your hours, evenings and weekends included.
For schools like St John's Church of England Primary School, the holidays are the usual time to inspect and clean ventilation.
Blackbrook is about 2 miles south-east of Dorking, in Surrey. We provide AHU cleaning for businesses, landlords and public buildings in Blackbrook and the rest of Surrey. We cover 395 places across Surrey, large and small. Guildford is in our area too, about 12 miles from Blackbrook.
Work in RH5 is surveyed, quoted and booked the same way as anywhere else. Other places close to Blackbrook include North Holmwood (1 mile north-west), Mid Holmwood (1 mile south-west), Dorking (2 miles north-west), Pixham (2 miles north) and Westcott (3 miles north-west). Within a short drive, we also cover Guildford (12 miles west), Woking (14 miles north-west), Epsom (9 miles north), Horley (7 miles east), Redhill (6 miles east) and Ewell (10 miles north).
Near you in Blackbrook
Locally, jobs take us to businesses close to Pippbrook House, Inholms Clay Pit and The Plough pub and the streets around them. Blackbrook’s nearest station is Holmwood station, roughly 2 miles south of the centre. A little further out are Betchworth Castle (2.1 miles north) and Headley Court (5.9 miles north). The countryside around Blackbrook includes Box Hill and Vann Lake.