Surrey · Air handling unit cleaning
Air handling unit cleaning in Castle Green, Surrey
Professional AHU cleaning in and around Castle Green, booked around your opening hours and finished with a written report and pictures.
- Odours coming through the supply air
- Units needing a clean before a new tenant or handover
- Fan sections that haven’t been cleaned in years
The process
Your trading hours come first. We book the visit for a time the area is closed, whether that is an evening, overnight or a weekend. Once we are in, the area is sheeted and anything that has to be off is turned off and cooled, and 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 Castle Green, let us know and we will plan around it.
- The survey covers the unit, its access and how it can be shut down.
- The area is protected and the unit made safe.
- Dirt and debris are removed from each section.
- Coils and trays are cleaned and the condensate drain cleared.
- The unit is closed up and handed back, with a report to follow.
Getting ready for the visit
- Dig out any earlier paperwork for the system
- Clear the space around the work
- Plan for cooking equipment or plant to be off before we arrive
Getting a quote
There’s no standard price list, because every site is different. Instead, we look at your site first, from photos or a survey, and then send you a fixed quote. To get going, phone us on 0345 646 2711 or send us an email.
Related advice
AHU cleaning in Castle Green, done properly
Heating and cooling coils trap dust that gets past the filters. A coated coil restricts airflow and makes the unit work harder. We clean coils with methods suited to their condition, taking care not to damage the fins. If you have coils clogged with dust and debris and fan sections that haven’t been cleaned in years, we can help, from drain trays, supply and extract fans and internal panels onwards.
Work in a small place like Castle Green starts with agreeing access and timings.
Accreditations are easy to claim and worth checking. We’re a BESCA Vent Hygiene Elite member, cleaning to BESA TR19® Grease, and we hold CHAS, SafeContractor and ISO 9001, with full insurance on top.
- Place
- Castle Green (GU24)
- Wider area
- Surrey
- Reporting
- Photo report after every visit
- Price
- A fixed quote up front
- When we work
- After hours by arrangement; emergencies any time
- Phone
- 0345 646 2711
- Last updated
- 30 October 2026
Managing agents and facilities teams in Castle Green
We regularly work with managing agents. Tell us the site, the work and the access arrangements and we will come back with a fixed quote.
We work for landlords, managing agents and facilities managers as well as the people running the site. Shared systems, like a riser serving several units, need a clear agreement on who books the work, and we are happy to quote for all of it.
Aftercare tips
Aftercare is simple, and it makes the next visit easier:
- File each AHU report in the maintenance log
- Keep filter changes on time and recorded
- Report musty smells from the vents right away
- Watch for drips or damp patches near the plant
The ducts served by the unit may need attention too. A clean unit feeding dirty ducts only solves half the problem, and we can quote for both.
Regular filter changes are the best protection an AHU has. Once filters clog, dirt starts getting past them.
Other services in Castle Green
What AHU cleaning looks like in Castle Green
Going by the FSA’s register, there are about 7 schools, colleges and universities and about 10 hospitals, care homes and childcare premises serving food in Castle Green 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. About 1.6 miles south of Castle Green is Brookwood Hospital, the nearest hospital. Clean air matters most where people are unwell, and that is as true in a care home as in a hospital. Castle Green is about 25 miles from central London, well within the area we cover across London and the South East. A survey and a fixed quote come first, then the visit at a time that suits you.
Healthcare buildings such as Brookwood Hospital, about 1.6 miles south, depend on their ventilation; if you manage a surgery, clinic or care home near Castle Green, yours matters too.
Castle Green is about 2 miles north-west of Woking, in Surrey. Wherever you are in the GU24 postcode area, we can carry out AHU cleaning at your premises. Castle Green is one of 395 places in Surrey we cover for commercial clients. Our Guildford page covers sites nearby (6 miles or so).
All of GU24 is within our area for AHU cleaning, from busy streets to back roads. Whether your site is on Scotts Grove Road, Guildford Road and Scott's Grove Close or a nearby road, we can help. Neighbouring places we cover for AHU cleaning include Penny Pot (1 mile north-west), Coxhill Green (1 mile north-east), Chobham (1 mile north-east), West End (1 mile west) and Bisley (1 mile south-west). Further out, we also cover Guildford (6 miles south), Camberley (5 miles west), Epsom (15 miles east), Farnham (12 miles south-west), Ewell (15 miles east) and Egham (7 miles north-east).
Near you in Castle Green
We work in commercial kitchens and buildings around The Sun Public House, Gordon's School and Milford Green and Coxhill Green. The closest station to Castle Green is Brookwood station, roughly 2.6 miles south-west. A little further out are Brookwood Hospital (1.6 miles south) and Chobham Museum (0.8 miles north-east). Green spaces nearby include Brookwood Lye.
What we’re called out for in Castle Green
Cooling coils create condensation, and that water has to go somewhere. If the drain tray outlet blocks or the tray doesn’t fall properly, water stands in it, and that is where slime and odours start.
Any of these means the system needs a check-up:
- Air handling units due a clean after building work
- Air handling units never cleaned inside
- Dirty fans and fan housings
- Filters that are clogged or overdue
If you manage a school such as St Lawrence CofE (Aided) Primary School, ventilation cleaning is best booked for the holidays.
What to look for in a quote
- Whether they recommend a next date
- What records you’ll receive afterwards
- Whether they’re fully insured
- Whether a survey comes first
Castle Green: your questions answered
Do you work overnight in Castle Green?
Yes, nights and weekends are routine for us. That way a site in Castle Green does not have to lose a day’s trading. Just give us a ring on 0345 646 2711, or send details by email with your opening times and we’ll plan around them.
Is Castle Green within the area you cover?
Yes, Castle Green is part of our area, however small the site. Let us know about access, parking and anything unusual about getting there when you book.
What does TR19 mean?
BESA’s ventilation hygiene specification, with two parts that matter most here: TR19® Grease for kitchen extracts and TR19® Air for supply and extract systems. It isn’t law, but it’s the benchmark.
Can you price the work without visiting?
In many cases, yes. Photos of the system and the access, plus your opening hours and last report, are often enough. Where we can’t see enough, we arrange a survey.
What do you need from me for a quote?
Where the site is, what it is and when it’s open, plus photos of the system and your last certificate or report if you have one.
Which sectors do you work in?
Any site with a kitchen or a ventilation system to look after, from a single café to a large school. We work with hotels, schools, care homes, offices, retail and leisure sites.
How do you keep the site clean during the work?
With sheeting and covers, before anything else happens. We keep the work contained and leave the area clean.
Which parts of an air handling unit do you 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.
Honest limits
In fairness, there are a few things this work won’t fix:
- Problems with the unit’s controls or sensors
- Mechanical faults with motors, belts or bearings
- Damaged coils beyond cleaning
If in doubt, give us a ring on 0345 646 2711 or use the quote form and we will say what we think.
Parts of the system we cover
- Internal panels
- Drain trays
- Dampers and louvres
- Filter sections
- Supply and extract fans
- Heating and cooling coils
How we price AHU cleaning
You’ll get a fixed price before we start. It takes into account:
- The condition we find in the survey
- Where the site is and how we reach it
- Working hours and out-of-hours timing
- A single visit or a regular plan
What you pay reflects the actual work. That is why we survey first, from pictures or on site, and why the quote is fixed before any work starts.
Helping us quote
To speed up the quote, send us:
- Photos showing the whole system and its surroundings
- The paperwork from the last visit, if you have it
- Where the site is and what kind of site it is
- Anything you’ve noticed, such as smells, noise, drips or poor airflow
The quickest way to a quote is to send photos: the system from a couple of angles, plus any access panels or hatches. Add the site type and your opening hours, and we can price many jobs without a visit.
Different parts, different methods
Filters
Filters are the first line of defence in the unit. As part of the clean, filters are checked and cleaned or replaced as agreed, and clean the filter housing.
Rooftop and plant room units
Rooftop units take the weather, and intakes can collect leaves and debris. The intake section gets particular attention.