Air handling units (AHU) in Surrey

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.

Every job in Surrey gets a written quote before it starts and a commissioning record when it finishes. We cover Staines, Banstead, Leatherhead, Ewell and Woking and the villages around them.

Air handling units in Surrey at a glance

Area: Surrey
Towns listed: 35, largest Woking
Postcode districts: KT7, KT10, KT20, RH1, TW15 and TW16
Price region: South East
Survey: Free survey (UK mainland)

How we do it

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. We plan the lift, temporary arrangements and isolations with you so the building can keep working.

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 Surrey

Air handling units (AHU) guide prices in Surrey
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.

Common reasons people call

Frequent belt or fan failures
Noisy plant rooms or rooftop units
Filters that are never changed

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 Surrey

Questions about air handling units (AHU) in Surrey

Are prices different in Surrey?

Our guide prices are adjusted by region. In Surrey 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 it worth replacing belt-driven fans with EC fans?

Often yes. EC fans are usually more efficient, quieter and need no belt changes, and the retrofit can cost much less than a new unit.

Can you work out of hours?

Yes. Changeovers and crane lifts are often done at weekends or evenings to avoid disruption.

Is the survey free in Surrey?

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.

Which rules apply to ventilation in Surrey?

In England, ventilation in new and altered homes is covered by Approved Document F of the Building Regulations. Landlords also have duties under the Housing Health and Safety Rating System, and workplaces must be ventilated under the Workplace (Health, Safety and Welfare) Regulations 1992.