Commercial ventilation, West Sussex
Air handling units (AHU) in West Sussex
AHU replacement, EC fan upgrades, controls and planned servicing, across West Sussex.
- From £10,950 + VAT per unit
- Free survey
An air handling unit (AHU) is the central plant that filters, moves and often heats, cools or recovers heat from the air for a building's ventilation system. We replace ageing units, upgrade fans and controls, and service AHUs so they keep delivering their design airflows.
Our team is based in Great Barr, Birmingham, and we work throughout West Sussex, from Crawley, Worthing, Bognor Regis, Littlehampton and Horsham. We survey first, free of charge for new installations on the mainland, then send a fixed written quote.
Air handling units in West Sussex at a glance
- Area
- West Sussex
- Towns listed
- 16, largest Crawley
- Postcode districts
- RH6, RH10, BN6, BN45, BN18 and PO21
- Price region
- South East
- Survey
- Free survey (UK mainland)
How we do it
Replacing the fan section with EC fans, or the whole unit with a modern heat recovery AHU, can cut running costs and noise while restoring airflow. New units must meet current ecodesign rules for fan efficiency and heat recovery. Replacements often involve crane lifts, roof work and out-of-hours changeovers.
Like-for-like replacement
New unit in the same position, connected to existing ductwork.
EC fan retrofit
Belt-driven fans replaced with direct-drive EC fans.
Controls upgrade
New controls, sensors and BMS integration.
Guide prices in West Sussex
| Work | Guide price |
|---|---|
| Air handling unit replacement, small to medium unit, like-for-like position (per unit) | £10,950–£38,450 + VAT |
| Air handling unit service: filters, belts or EC fan check, coils, controls (per unit per visit) | £215–£435 + VAT |
South East rates shown. Prices exclude VAT. The fixed price is confirmed in writing after we have seen the job.
When to get it looked at
- Noisy plant rooms or rooftop units
- Filters that are never changed
- Corroded casings or leaking drain trays
Rules in England
In England, ventilation is covered by Part F of the Building Regulations and its guidance, Approved Document F (2021 edition). Workplaces must also be ventilated with a sufficient quantity of fresh or purified air under the Workplace (Health, Safety and Welfare) Regulations 1992.
How the job runs
- Survey
- Options
- Plan
- Install
- Commission
Towns we cover in West Sussex
- Crawley
- Worthing
- Bognor Regis
- Littlehampton
- Horsham
- Haywards Heath
- Chichester
- Burgess Hill
- East Grinstead
- Shoreham-by-Sea
- Lancing
- Rustington
- Broadfield
- Hurstpierpoint
- Barnham
- Selsey
Questions about air handling units (AHU) in West Sussex
Which towns in West Sussex do you cover?
All of West Sussex, including Crawley, Worthing, Bognor Regis, Littlehampton and Horsham. If your town is not listed, send the postcode and we will confirm.
Can you work out of hours?
Yes. Changeovers and crane lifts are often done at weekends or evenings to avoid disruption.
What does an AHU service cost?
A service visit typically costs £195 to £395 per unit excluding VAT, depending on size and access.
Are prices different in West Sussex?
Our guide prices are adjusted by region. In West Sussex we use South East rates, so air handling unit replacement, small to medium unit, like-for-like position is typically £10,950 to £38,450 + VAT per unit.
Is the survey free in West Sussex?
For new installations on the UK mainland, yes. The survey is free and the quote that follows is fixed and in writing. Servicing, testing and repair visits are charged, and we confirm the cost before booking.
Other services in West Sussex
Get a guide price in two minutes
Answer a few questions for a price range, or send photos and we will come back to you with a written quote.